HP 6125XLG User manual
HP 6125XLG Blade Switch
Layer 2—LAN Switching
Configuration Guide
Part number: 5998-5368a
Software version: Release 240x
Document version: 6W101-20150515
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Contents
Configuring Ethernet interfaces··································································································································· 1
Configuring a management Ethernet interface ··············································································································1
Ethernet interface naming conventions ···························································································································1
Configuring common Ethernet interface settings ···········································································································2
Splitting a 40-GE interface and combining split 10-GE interfaces ·····································································2
Configuring basic settings of an Ethernet interface ······························································································3
Configuring the link mode of an Ethernet interface······························································································5
Configuring jumbo frame support ··························································································································5
Configuring physical state change suppression on an Ethernet interface··························································6
Performing a loopback test on an Ethernet interface····························································································6
Configuring generic flow control on an Ethernet interface··················································································7
Configuring PFC on an Ethernet interface ·············································································································8
Setting the statistics polling interval························································································································9
Forcibly bringing up a fiber port ····························································································································9
Configuring a Layer 2 Ethernet interface ···················································································································· 11
Configuring storm suppression ···························································································································· 11
Configuring storm control on an Ethernet interface··························································································· 12
Configuring a Layer 3 Ethernet interface or subinterface·························································································· 13
Setting the MTU for an Ethernet interface or subinterface ················································································ 13
Displaying and maintaining an Ethernet interface ····································································································· 13
Configuring loopback, null, and inloopback interfaces··························································································15
Configuring a loopback interface ································································································································ 15
Configuring a null interface ·········································································································································· 16
Configuring an inloopback interface··························································································································· 16
Displaying and maintaining loopback, null, and inloopback interfaces ································································· 16
Bulk configuring interfaces ········································································································································17
Configuration guidelines ··············································································································································· 17
Configuration procedure··············································································································································· 17
Displaying and maintaining bulk interface configuration·························································································· 18
Configuring the MAC address table ························································································································19
Overview········································································································································································· 19
How a MAC address entry is created ················································································································ 19
Types of MAC address entries····························································································································· 19
Configuring the MAC address table···························································································································· 20
Configuring MAC address entries······················································································································· 20
Adding or modifying a blackhole MAC address entry····················································································· 22
Adding or modifying a multiport unicast MAC address entry ········································································· 22
Disabling MAC address learning························································································································ 23
Configuring the aging timer for dynamic MAC address entries······································································ 24
Configuring the MAC learning limit on an interface························································································· 25
Configuring the frame forwarding rule on an interface···················································································· 25
Assigning MAC learning priority to an interface······························································································· 26
Enabling MAC address synchronization ············································································································ 27
Enable MAC address moving notifications ········································································································ 28
Enabling SNMP notifications for the MAC address table················································································· 30
Displaying and maintaining the MAC address table································································································· 30
MAC address table configuration example ················································································································ 31
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Network requirements··········································································································································· 31
Configuration procedure ······································································································································ 31
Verifying the configuration··································································································································· 32
Configuring MAC Information ··································································································································33
Configuration guidelines ··············································································································································· 33
Enabling MAC Information ··········································································································································· 33
Configuring the MAC Information mode····················································································································· 34
Configuring the MAC change sending interval·········································································································· 34
Configuring the MAC Information queue length ········································································································ 34
MAC Information configuration example···················································································································· 35
Network requirements··········································································································································· 35
Configuration guidelines ······································································································································ 35
Configuration procedure ······································································································································ 35
Configuring Ethernet link aggregation ·····················································································································37
Basic concepts································································································································································ 37
Aggregation group, member port, and aggregate interface··········································································· 37
Aggregation states of member ports in an aggregation group ······································································· 38
Operational key ···················································································································································· 38
Configuration types··············································································································································· 38
Link aggregation modes ······································································································································· 39
Aggregating links in static mode·································································································································· 39
Choosing a reference port ··································································································································· 39
Setting the aggregation state of each member port ·························································································· 40
Aggregating links in dynamic mode···························································································································· 41
LACP ······································································································································································· 41
How dynamic link aggregation works················································································································ 42
Edge aggregate interface ············································································································································· 44
Load sharing modes for link aggregation groups ······································································································ 44
Ethernet link aggregation configuration task list········································································································· 44
Configuring an aggregation group ····························································································································· 45
Configuration guidelines ······································································································································ 45
Configuring a static aggregation group············································································································· 46
Configuring a dynamic aggregation group ······································································································· 47
Configuring an aggregate interface ···························································································································· 49
Setting the description for an aggregate interface ···························································································· 49
Specifying ignored VLANs for a Layer 2 aggregate interface········································································· 49
Setting the MTU for a Layer 3 aggregate interface··························································································· 50
Setting the minimum and maximum numbers of Selected ports for an aggregation group·························· 50
Setting the expected bandwidth for an aggregate interface············································································ 51
Configuring an edge aggregate interface·········································································································· 51
Enabling BFD for an aggregation group ············································································································ 52
Shutting down an aggregate interface ··············································································································· 53
Restoring the default settings for an aggregate interface ················································································· 53
Configuring load sharing for link aggregation groups······························································································ 54
Setting load sharing modes for link aggregation groups ················································································· 54
Enabling local-first load sharing for link aggregation······················································································· 55
Configuring per-flow load sharing algorithm settings for Ethernet link aggregation ····································· 55
Enabling link-aggregation traffic redirection··············································································································· 56
Configuration restrictions and guidelines ··········································································································· 56
Configuration procedure ······································································································································ 56
Displaying and maintaining Ethernet link aggregation ····························································································· 57
Ethernet link aggregation configuration examples····································································································· 57
Layer 2 static aggregation configuration example···························································································· 57
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Layer 2 dynamic aggregation configuration example······················································································ 59
Layer 2 aggregation load sharing configuration example··············································································· 61
Layer 2 edge aggregate interface configuration example ··············································································· 63
Layer 3 static aggregation configuration example···························································································· 65
Layer 3 dynamic aggregation configuration example······················································································ 66
Layer 3 edge aggregate interface configuration example ··············································································· 67
Configuring port isolation··········································································································································70
Assigning a port to an isolation group························································································································ 70
Displaying and maintaining port isolation ·················································································································· 70
Port isolation configuration example···························································································································· 71
Network requirements··········································································································································· 71
Configuration procedure ······································································································································ 71
Verifying the configuration··································································································································· 72
Configuring spanning tree protocols ························································································································73
STP ··················································································································································································· 73
STP protocol packets ············································································································································· 73
Basic concepts in STP············································································································································ 74
Calculation process of the STP algorithm ··········································································································· 75
RSTP················································································································································································· 81
PVST················································································································································································· 81
MSTP················································································································································································ 81
MSTP features ························································································································································ 82
MSTP basic concepts ············································································································································ 82
How MSTP works ·················································································································································· 86
MSTP implementation on devices ························································································································ 87
Protocols and standards ················································································································································ 87
Spanning tree configuration task lists ·························································································································· 87
STP configuration task list····································································································································· 88
RSTP configuration task list··································································································································· 89
PVST configuration task list··································································································································· 90
MSTP configuration task list ································································································································· 91
Setting the spanning tree mode···································································································································· 91
Configuration restrictions and guidelines ··········································································································· 92
Configuration procedure ······································································································································ 92
Configuring an MST region ·········································································································································· 92
Configuring the root bridge or a secondary root bridge ·························································································· 93
Configuring the current device as the root bridge of a specific spanning tree·············································· 94
Configuring the current device as a secondary root bridge of a specific spanning tree······························ 94
Configuring the device priority····································································································································· 94
Configuring the maximum hops of an MST region ···································································································· 95
Configuring the network diameter of a switched network························································································· 95
Configuring spanning tree timers································································································································· 96
Configuration restrictions and guidelines ··········································································································· 96
Configuration procedure ······································································································································ 97
Configuring the timeout factor ······································································································································ 97
Configuring the BPDU transmission rate······················································································································ 98
Configuring edge ports ················································································································································· 98
Configuration restrictions and guidelines ··········································································································· 98
Configuration procedure ······································································································································ 99
Configuring path costs of ports ···································································································································· 99
Specifying a standard for the device to use when it calculates the default path cost ··································· 99
Configuring path costs of ports··························································································································102
Configuration example ·······································································································································102
iv
Configuring the port priority ·······································································································································102
Configuring the port link type·····································································································································103
Configuration restrictions and guidelines ·········································································································103
Configuration procedure ····································································································································103
Configuring the mode a port uses to recognize and send MSTP packets ·····························································104
Enabling outputting port state transition information································································································104
Enabling the spanning tree feature ····························································································································105
Enabling the spanning tree feature in STP/RSTP/MSTP mode·······································································105
Enabling the spanning tree feature in PVST mode···························································································105
Performing mCheck······················································································································································106
Configuration restrictions and guidelines ·········································································································106
Configuration procedure ····································································································································106
Configuring Digest Snooping ·····································································································································107
Configuration restrictions and guidelines ·········································································································107
Configuration procedure ····································································································································108
Digest Snooping configuration example···········································································································108
Configuring No Agreement Check ····························································································································109
Configuration prerequisites ································································································································110
Configuration procedure ····································································································································110
No Agreement Check configuration example··································································································111
Configuring TC Snooping ···········································································································································111
Configuration restrictions and guidelines ·········································································································112
Configuration procedure ····································································································································112
Configuring protection functions ································································································································113
Enabling BPDU guard ·········································································································································113
Enabling root guard············································································································································113
Enabling loop guard ···········································································································································114
Configuring port role restriction·························································································································115
Configuring TC-BPDU transmission restriction··································································································115
Enabling TC-BPDU guard····································································································································116
Enabling BPDU drop ···········································································································································116
Displaying and maintaining the spanning tree·········································································································117
Spanning tree configuration example························································································································117
Network requirements·········································································································································117
Configuration procedure ····································································································································118
Verifying the configuration·································································································································120
PVST configuration example ·······································································································································121
Network requirements·········································································································································121
Configuration procedure ····································································································································122
Verifying the configuration·································································································································123
Configuring loop detection····································································································································· 125
Overview·······································································································································································125
Loop detection mechanism ·································································································································125
Loop detection interval········································································································································126
Loop protection actions·······································································································································126
Port status auto recovery·····································································································································127
Loop detection configuration task list·························································································································127
Enabling loop detection ··············································································································································127
Enabling loop detection globally·······················································································································127
Enabling loop detection on a port·····················································································································127
Configuring the loop protection action······················································································································128
Configuring the global loop protection action·································································································128
Configuring the loop protection action on a Layer 2 Ethernet interface ·······················································128
Configuring the loop protection action on a Layer 2 aggregate interface···················································128
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Setting the loop detection interval ······························································································································129
Displaying and maintaining loop detection ··············································································································129
Loop detection configuration example·······················································································································129
Network requirements·········································································································································129
Configuration procedure ····································································································································130
Verifying the configuration·································································································································131
Configuring VLANs················································································································································· 133
Overview·······································································································································································133
VLAN frame encapsulation ································································································································133
Protocols and standards ·····································································································································134
Configuring basic VLAN settings································································································································134
Configuring basic settings of a VLAN interface ·······································································································135
Configuring port-based VLANs···································································································································136
Introduction to port-based VLAN ·······················································································································136
Assigning an access port to a VLAN ················································································································137
Assigning a trunk port to a VLAN······················································································································138
Assigning a hybrid port to a VLAN···················································································································139
Configuring IP subnet-based VLANs ··························································································································140
Introduction ··························································································································································140
Configuring an IP subnet-based VLAN··············································································································141
Configuring protocol-based VLANs ···························································································································142
Introduction ··························································································································································142
Configuring a protocol-based VLAN·················································································································142
Displaying and maintaining VLANs···························································································································143
VLAN configuration examples····································································································································144
Port-based VLAN configuration example··········································································································144
IP subnet-based VLAN configuration example ·································································································145
Protocol-based VLAN configuration example···································································································147
Configuring super VLANs······································································································································· 151
Configuration task list ··················································································································································151
Creating a sub-VLAN···················································································································································151
Configuring a super VLAN··········································································································································151
Configuring a super VLAN interface··························································································································152
Displaying and maintaining super VLANs ················································································································153
Super VLAN configuration example ··························································································································153
Network requirements·········································································································································153
Configuration procedure ····································································································································153
Verifying the configuration·································································································································154
Configuring the private VLAN································································································································ 156
Configuration task list ··················································································································································156
Configuration restrictions and guidelines··················································································································157
Configuration procedure·············································································································································157
Displaying and maintaining the private VLAN ·········································································································160
Private VLAN configuration examples ·······················································································································160
Promiscuous port configuration example··········································································································160
Trunk promiscuous port configuration example ·······························································································162
Trunk promiscuous and trunk secondary port configuration example···························································165
Secondary VLAN Layer 3 communication configuration example ································································170
Configuring MVRP ·················································································································································· 173
MRP ···············································································································································································173
MRP implementation ···········································································································································173
MRP messages ·····················································································································································174
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MRP timers····························································································································································175
MVRP registration modes ············································································································································175
Protocols and standards ··············································································································································176
MVRP configuration task list········································································································································176
Configuration restrictions and guidelines··················································································································176
Configuration prerequisites·········································································································································177
Enabling MVRP·····························································································································································177
Configuring an MVRP registration mode···················································································································177
Configuring MRP timers···············································································································································178
Enabling GVRP compatibility······································································································································179
Displaying and maintaining MVRP ····························································································································179
MVRP configuration example ·····································································································································180
Network requirements·········································································································································180
Configuration procedure ····································································································································180
Verifying the configuration·································································································································184
Configuring QinQ··················································································································································· 190
Overview·······································································································································································190
How QinQ works················································································································································190
QinQ implementations········································································································································191
Protocols and standards ·····································································································································191
Restrictions and guidelines··········································································································································192
Configuring QinQ························································································································································192
Enabling QinQ ····················································································································································192
Configuring transparent transmission for VLANs·····························································································192
Configuring the TPID in VLAN tags····························································································································193
Configuring the CVLAN TPID ·····························································································································194
Configuring the SVLAN TPID······························································································································194
Setting the 802.1p priority in SVLAN tags ···············································································································194
Displaying and maintaining QinQ ····························································································································196
QinQ configuration example······································································································································196
Basic QinQ configuration example···················································································································196
VLAN transparent transmission configuration example ··················································································198
Configuring VLAN mapping ·································································································································· 201
Overview·······································································································································································201
Application scenario of one-to-one and many-to-one VLAN mapping ··························································201
Application scenario of one-to-two and two-to-two VLAN mapping······························································203
VLAN mapping implementations ·······················································································································203
Configuration restrictions and guidelines··················································································································206
VLAN mapping configuration task list ·······················································································································206
Configuring one-to-one VLAN mapping ····················································································································207
Configuring many-to-one VLAN mapping ·················································································································208
Configuring many-to-one VLAN mapping in a network with dynamic IP address assignment···················208
Configuring many-to-one VLAN mapping in a network with static IP address assignment·························210
Configuring one-to-two VLAN mapping ····················································································································212
Configuring two-to-two VLAN mapping·····················································································································213
Displaying and maintaining VLAN mapping············································································································214
VLAN mapping configuration examples ···················································································································214
One-to-one and many-to-one VLAN mapping configuration example···························································214
One-to-two and two-to-two VLAN mapping configuration example ······························································219
Configuring PBB······················································································································································ 222
Overview·······································································································································································222
PBB network model ·············································································································································222
Terminology ·························································································································································222
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PBB frame format·················································································································································223
PBB frame forwarding·········································································································································225
Protocols and standards ·····································································································································225
PBB configuration task list ···········································································································································225
Enabling L2VPN ···························································································································································226
Creating a PBB VSI ······················································································································································226
Configuring the frame encapsulation type ················································································································226
Configuring a B-VLAN for a PBB VSI ·························································································································227
Configuring an uplink port··········································································································································227
Configuring a downlink port·······································································································································228
Displaying and maintaining PBB································································································································228
PBB configuration example ·········································································································································228
Network requirements·········································································································································228
Configuration procedures···································································································································229
Verifying the configuration·································································································································230
Troubleshooting····························································································································································230
Symptom·······························································································································································230
Analysis ································································································································································230
Solution·································································································································································230
Configuring LLDP····················································································································································· 232
Overview·······································································································································································232
Basic concepts ·····················································································································································232
Working mechanism···········································································································································237
Protocols and standards ·····································································································································238
LLDP configuration task list ··········································································································································238
Performing basic LLDP configuration··························································································································239
Enabling LLDP ······················································································································································239
Configuring the LLDP bridge mode····················································································································240
Setting the LLDP operating mode ·······················································································································240
Setting the LLDP re-initialization delay ··············································································································241
Enabling LLDP polling··········································································································································241
Configuring the advertisable TLVs ·····················································································································242
Configuring the management address and its encoding format····································································244
Setting other LLDP parameters····························································································································245
Setting an encapsulation format for LLDP frames·····························································································246
Configuring CDP compatibility···································································································································246
Configuration prerequisites ································································································································247
Configuration procedure ····································································································································247
Configuring DCBX························································································································································248
DCBX configuration task list ·······························································································································249
Enabling LLDP and DCBX TLV advertising ········································································································249
Configuring APP parameters······························································································································250
Configuring ETS parameters ······························································································································252
Configuring PFC parameters······························································································································253
Configuring the DCBX version ···························································································································254
Configuring LLDP trapping and LLDP-MED trapping ································································································255
Displaying and maintaining LLDP·······························································································································255
Basic LLDP configuration example······························································································································256
DCBX configuration example······································································································································260
Configuring service loopback groups ··················································································································· 266
Configuration procedure·············································································································································266
Displaying and maintaining service loopback groups·····························································································267
Service loopback group configuration example·······································································································267
viii
Network requirements·········································································································································267
Configuration procedure ····································································································································267
Configuring cut-through Layer 2 forwarding········································································································· 268
Support and other resources ·································································································································· 269
Contacting HP ······························································································································································269
Subscription service ············································································································································269
Related information······················································································································································269
Documents····························································································································································269
Websites·······························································································································································269
Conventions ··································································································································································270
Index ········································································································································································ 272
1
Configuring Ethernet interfaces
The Ethernet interfaces on the HP 6125XLG blade switches include:
•Uplink interfaces—The front panel of the switch houses the uplink ports, including four QSFP+
interfaces and eight SFP+ interfaces. The uplink interfaces are used to connect the switch to other
network devices or form an IRF fabric with other blade switches.
•Downlink interfaces—The rear panel of the switch houses sixteen downlink ports, which are used to
connect the switch to the blade server.
•Crosslink interfaces—The rear panel of the switch houses four crosslink ports, which are used to
connect the switch to other blade switches or form an IRF fabric with other blade switches.
For more information about the interfaces on the HP 6125XLG blade switches, see HP 6125XLG Blade
Switch Installation Guide.
Configuring a management Ethernet interface
The management interface on an HP 6125XLG blade switch is located in the rear of the switch. To
configure the blade switch through the management module of the server, you can connect the
management module to the management interface.
To configure a management Ethernet interface:
Ste
p
Command
Remarks
1. Enter system view. system-view N/A
2. Enter management
Ethernet interface view.
interface M-Ethernet
interface-number N/A
3. (Optional.) Set the
interface description. description text The default setting is M-Ethernet0/0/0
Interface.
4. (Optional.) Shut down
the interface. shutdown By default, the management Ethernet
interface is up.
Ethernet interface naming conventions
The Ethernet interfaces on the HP 6125XLG blade switches are named in the format of interface type
A/B/C. The letters that follow the interface type represent the following elements:
•A—IRF member ID.
•B—Slot number. The slot number of the uplink ports on the front panel is 1. The slot number of the
downlink ports and crosslink ports on the rear panel is 0.
•C—Port number. See Figure 1.
2
Figure 1 Port numbers
A 10-GE interface split from a 40-GE interface is named in the format of interface type A/B/C:D. A/B/C
is the interface number of the 40-GE interface and D is the number of the 10-GE interface, which is in the
range of 1 to 4. For information about splitting a 40-GE interface, see "Splitting a 40-GE interface and
combining split 10-GE interfaces."
Configuring common Ethernet interface settings
This section describes the settings common to Layer 2 and Layer 3 Ethernet interfaces. You can set an
Ethernet port as a Layer 3 interface by using the port link-mode route command. For more information,
see "Configuring the link mode of an Ethernet interface." For more information about the settings specific
to Layer 2 and Layer 3 Ethernet interfaces, see "Configuring a Layer 2 Ethernet interface" and
"Configuring a Layer 3 Ethernet interface or subinterface."
Splitting a 40-GE interface and combining split 10-GE
interfaces
Splitting a 40-GE QSFP+ interface into four 10-GE interfaces
You can use a 40-GE QSFP+ interface as a single interface. To improve port density, reduce costs, and
improve network flexibility, you can also split a 40-GE QSFP+ interface into four 10-GE interfaces.
To split a 40-GE interface into four 10-GE interfaces:
Step Command Remarks
5. Enter system view. system-view N/A
6. Enter 40-GE interface view. interface interface-type
interface-number N/A
6125XLG
External uplink port
1
23
4
5
6
78
9
1011
12
SFP+ port QSFP+ port
Internal downlink port
Backplane
12345678910 11 12 13 14 15 16 17 1819 20
Internal crosslink port
3
Step Command Remarks
7. Split the 40-GE interface into
four 10-GE interfaces. using tengige
By default, a 40-GE interface is not
split and operates as a single
interface.
The 10-GE interfaces split from a
40-GE interface support the same
configuration and attributes as
common 10-GE interfaces, except
that they are numbered in a different
way.
8. Reboot the device. N/A
After creating the four 10-GE
interfaces, the system removes the
40-GE interface.
A 40-GE interface split into four
10-GE interfaces must use a
dedicated 1-to-4 cable.
Combining four split 10-GE interfaces into a 40-GE interface
If you need higher bandwidth, you can combine the four split 10-GE interfaces into a 40-GE interface.
To combine four split 10-GE interfaces into a 40-GE interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter the view of any 10-GE
interface split from a 40-GE
interface.
interface interface-type
interface-number N/A
3. Combine the four 10-GE
interfaces into a 40-GE
interface. using fortygige
By default, a 40-GE interface is not
split and operates as a single
interface.
4. Reboot the device. N/A
After creating the 40-GE interface,
the system removes the four 10-GE
interfaces.
After you combine the four 10-GE
interfaces, replace the dedicated
1-to-4 cable with a dedicated
1-to-1 cable or a 40-GE transceiver
module. For more information
about the cable or transceiver
module, see the installation guides.
Configuring basic settings of an Ethernet interface
Configuring an Ethernet interface
Step Command Remarks
1. Enter system view. system-view N/A
4
Step Command Remarks
2. Enter Ethernet interface
view.
interface interface-type
interface-number N/A
3. Set the interface
description. description text
The default setting is in the format of
interface-name Interface. For example,
Ten-GigabitEthernet1/1/5 Interface.
4. Set the duplex mode of
the Ethernet interface. duplex { auto | full } The default setting is auto for Ethernet
interfaces.
5. Set the port speed. speed { 1000 |10000 |40000
| auto }
The default setting is auto for Ethernet
interfaces.
For more information, see Layer 2—LAN
Switching Command References.
6. Configure the expected
bandwidth of the
interface.
bandwidth bandwidth-value
By default, the expected bandwidth (in
kbps) is the interface baud rate divided by
1000.
7. Restore the default
settings for the Ethernet
interface.
default N/A
8. Bring up the Ethernet
interface. undo shutdown By default, Ethernet interfaces are in up
state.
Configuring an Ethernet subinterface
Step Command Remarks
1. Enter system view. system-view N/A
2. Create an Ethernet
subinterface and enter
its view.
interface interface-type
interface-number.subnumber N/A
3. Set the subinterface
description. description text
The default setting is in the format of
interface-name Interface. For
example,
Ten-GigabitEthernet1/1/5.1
Interface.
4. Restore the default
settings for the Ethernet
subinterface.
default N/A
5. Configure the expected
bandwidth for the
interface.
bandwidth bandwidth-value
By default, the expected bandwidth
(in kbps) is the interface baud rate
divided by 1000.
6. Bring up the Ethernet
subinterface. undo shutdown By default, Ethernet subinterfaces are
in up state.
5
Configuring the link mode of an Ethernet interface
CAUTION:
A
fter you chan
g
e the link mode of an Ethernet interface, all commands (except the shutdown command)
on the Ethernet interface are restored to their defaults in the new link mode.
The interfaces on this switch series can operate either as Layer 2 or Layer 3 Ethernet interfaces (you can
set the link mode to bridge or route).
To change the link mode of an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface view. interface interface-type
interface-number N/A
3. Change the link mode of the
Ethernet interface. port link-mode { bridge | route } By default, Ethernet interfaces
operate in bridge mode.
Configuring jumbo frame support
An Ethernet interface might receive some frames larger than the standard Ethernet frame size (called
"jumbo frames") during high-throughput data exchanges, such as file transfers. The interface processes
jumbo frames in the following way:
•When the Ethernet interface is configured to deny jumbo frames (by using the undo jumboframe
enable command), the Ethernet interface discards jumbo frames without further processing.
•When the Ethernet interface is configured with jumbo frame support, the Ethernet interface
processes jumbo frames within the specified length, and it discards jumbo frames exceeding the
specified length without further processing.
To configure jumbo frame support in interface view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number N/A
3. Configure jumbo frame
support. jumboframe enable [ value ]
By default, the device allows jumbo
frames within 10000 bytes to pass
through all Ethernet interfaces.
6
Configuring physical state change suppression on an Ethernet
interface
IMPORTANT:
Do not configure physical state change suppression on an Ethernet interface with MSTP, or Smart Link
enabled.
The physical link state of an Ethernet interface is either up or down. Each time the physical link of a port
goes up or comes down, the interface immediately reports the change to the CPU. The CPU then notifies
the upper-layer protocol modules (such as routing and forwarding modules) of the change for guiding
packet forwarding, and automatically generates traps and logs, informing the user to take
corresponding actions.
To prevent frequent physical link flapping from affecting system performance, configure physical state
change suppression to suppress the reporting of physical link state changes. The system reports physical
layer changes only when the suppression interval expires.
When the link-delay delay-time command is configured:
•The link-down event is not reported to the CPU unless the interface is still down when the suppression
interval (delay-time) expires.
•The link-up event is immediately reported.
When the link-delay delay-time mode up command is configured:
•The link-up event is not reported to the CPU unless the interface is still up when the suppression
interval (delay-time) expires.
•The link-down event is immediately reported.
When the link-delay delay-time mode updown command is configured, the link-down or link-up event is
not reported to the CPU unless the interface is still down or up when the suppression interval (delay-time)
expires.
To configure physical state change suppression on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet
interface view.
interface interface-type
interface-number N/A
3. Configure physical
state change
suppression on the
interface.
link-delay [ msec ]
delay-time [ mode { up |
updown }]
By default, the link-down or link-up event is
immediately reported to the CPU.
If you configure this command multiple times on an
Ethernet interface, the most recent configuration
takes effect.
Performing a loopback test on an Ethernet interface
If an Ethernet interface does not work correctly, you can perform a loopback test on it to identify the
problem. An Ethernet interface in a loopback test does not forward data traffic.
Loopback tests include the following types:
7
•Internal loopback test—Tests all on-chip functions related to the Ethernet interface.
•External loopback test—Tests the hardware of the Ethernet interface. To perform an external
loopback test on the Ethernet interface, connect a loopback plug to the Ethernet interface. The
device sends test packets out of the interface, which are expected to loop over the plug and back
to the interface. If the interface fails to receive any test packets, the hardware of the interface is
faulty.
Configuration restrictions and guidelines
•On an administratively shut down Ethernet interface (displayed as in ADM or Administratively
DOWN state), you cannot perform an internal or external loopback test.
•The speed, duplex, and shutdown commands are not available during a loopback test.
•During a loopback test, the Ethernet interface operates in full duplex mode. When a loopback test
is complete, the port returns to its duplex setting.
Configuration procedure
To perform a loopback test on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface view. interface interface-type
interface-number N/A
3. Perform a loopback test. loopback { external | internal } By default, no loopback test is
performed.
Configuring generic flow control on an Ethernet interface
To avoid packet drops on a link, you can enable generic flow control at both ends of the link. When
traffic congestion occurs at the receiving end, the receiving end sends a flow control (Pause) frame to ask
the sending end to suspend sending packets.
•With TxRx mode generic flow control enabled, an interface can both send and receive flow control
frames. When congestion occurs, the interface sends a flow control frame to its peer. When the
interface receives a flow control frame from the peer, it suspends sending packets.
•With Rx flow mode generic control enabled, an interface can receive flow control frames, but it
cannot send flow control frames. When the interface receives a flow control frame from its peer, it
suspends sending packets to the peer. When congestion occurs, the interface cannot send flow
control frames to the peer.
To handle unidirectional traffic congestion on a link, configure the flow-control receive enable command
at one end and the flow-control command at the other end. To enable both ends of a link to handle traffic
congestion, configure the flow-control command at both ends.
To enable generic flow control on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number N/A
8
Step Command Remarks
3. Enable generic flow control.
•Enable TxRx mode generic
flow control:
flow-control
•Enable Rx mode generic flow
control:
flow-control receive enable
By default, generic flow control is
disabled on an Ethernet interface.
Configuring PFC on an Ethernet interface
PFC performs flow control based on 802.1p priorities. With PFC enabled, an interface requires its peer
to suspend sending packets with certain 802.1p priorities when congestion occurs. By decreasing the
transmission rate, PFC helps avoid packet loss.
You can enable PFC for certain 802.1p priorities at the two ends of a link. When network congestion
occurs, the local device checks the PFC status for the 802.1p priority carried in each arriving packet. The
device processes the packet depending on the PFC status as follows:
•If PFC is enabled for the 802.1p priority, the local device accepts the packet and sends a PFC pause
frame to the peer. The peer stops sending packets carrying this 802.1p priority for an interval as
specified in the PFC pause frame. This process is repeated until the congestion is removed.
•If PFC is disabled for the 802.1p priority, the local port drops the packet.
To configure PFC on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface view. interface interface-type
interface-number N/A
3. Enable PFC on the interface
through automatic negotiation
or forcibly.
priority-flow-control {auto |
enable }By default, PFC is disabled.
4. Enable PFC for specific
802.1p priorities.
priority-flow-control no-drop
dot1p dot1p-list
By default, PFC is disabled for all
802.1p priorities.
When you configure PFC, follow these guidelines:
•To perform PFC on a network port of an IRF member device, configure PFC on both the network port
and the IRF physical ports. For information about IRF, see IRF configuration Guide.
•To ensure correct operations of IRF and other protocols, HP recommends not enabling PFC for
802.1p priorities 0, 6, and 7.
•Perform the same PFC configuration on all ports that traffic travels through.
•A port can receive PFC pause frames regardless of whether PFC is enabled on the port. However,
only a port with PFC enabled can process PFC pause frames. To make PFC take effect, make sure
PFC is enabled on both the local end and the peer end.
The relationship between the PFC function and the generic flow control function is shown in Table 1.
9
Table 1 The relationship between the PFC function and the generic flow control function
flow-control
priority-flo
w-control
enable
priority-flow-contr
ol no-drop dot1p Remarks
Unconfigurable Configured Configured
You cannot enable flow control by using the
flow-control command on a port where PFC is
enabled and PFC is enabled for the specified
802.1p priority values.
Configured Configurable Unconfigurable
•On a port configured with the flow-control
command, you can enable PFC, but you
cannot enable PFC for specific 802.1p
priorities.
•Enabling both generic flow control and PFC on
a port disables the port from sending common
or PFC pause frames to inform the peer of
congestion conditions. However, the port can
still handle common and PFC pause frames
from the peer.
Setting the statistics polling interval
To set the statistics polling interval in Ethernet interface view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number N/A
3. Set the statistics polling
interval. flow-interval interval By default, the statistics polling interval
is 300 seconds.
To display the interface statistics collected in the last polling interval, use the display interface command.
To clear interface statistics, use the reset counters interface command.
Forcibly bringing up a fiber port
CAUTION:
The following operations on a fiber port will cause link updown events before the port finally stays up:
•Configure the port up-mode command and the speed or duplex command at the same time.
•Install or remove fiber links or transceiver modules after you forcibly bring up the fiber port.
IMPORTANT:
•Only fiber ports support this feature.
•The port up-mode command is mutually exclusive with either of the shutdown and loopback
commands.
10
As shown in Figure 2, a fiber port typically uses separate fibers for transmitting and receiving packets.
The physical state of the fiber port is up only when both transmit and receive fibers are physically
connected. If one of the fibers is disconnected, the fiber port does not work.
To enable a fiber port to forward traffic over a single link, you can use the port up-mode command. This
command brings up a fiber port by force, even when no fiber links or optical modules are present. If one
fiber link is present and up, the fiber port can forward packets over the link unidirectionally.
Figure 2 Forcibly bring up a fiber port
Configuration procedure
To forcibly bring up a fiber port:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number N/A
3. Forcibly bring up the fiber
GE, 10-GE, or 40-GE port. port up-mode
By default, a fiber Ethernet port is not
forcibly brought up, and the physical state
of a fiber port depends on the physical
state of the fibers.
Correct fiber
connection
When Ethernet
interfaces cannot
be or are not
forcibly brought up
When Ethernet interfaces
are forcibly brought up
Fiber port Tx end Rx end The fiber is
disconnected.
Fiber link
XGE1/1/5
XGE1/1/5
Device A
Device B
XGE1/1/5
XGE1/1/5
Device A
Device B
XGE1/1/5
XGE1/1/5
Device A
Device B
The interface is
down.
Packets
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