HPE FlexNetwork 5130 HI SERIES User manual
HPE FlexNetwork 5130 HI Switch Series
Layer 2—LAN Switching
Configuration Guide
Part number: 5998-8409a
Software version: Release 11xx
Document version: 6W101-20161221
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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 ·······························································································1
Configuring basic settings of an Ethernet interface····················································································1
Configuring jumbo frame support···············································································································2
Configuring physical state change suppression on an Ethernet interface ·················································3
Performing a loopback test on an Ethernet interface ·················································································3
Configuring generic flow control on an Ethernet interface ·········································································4
Enabling energy saving features on an Ethernet interface ········································································5
Setting the statistics polling interval ···········································································································6
Enabling automatic negotiation for speed downgrading ············································································6
Configuring a Layer 2 Ethernet interface ···········································································································6
Configuring storm suppression ··················································································································6
Configuring storm control on an Ethernet interface····················································································7
Forcibly bringing up a fiber port··················································································································9
Setting the MDIX mode of an Ethernet interface······················································································10
Testing the cable connection of an Ethernet interface ·············································································11
Enabling bridging on an Ethernet interface ······························································································11
Displaying and maintaining an Ethernet interface····························································································11
Configuring loopback, null, and inloopback interfaces ·································· 13
Configuring a loopback interface ·····················································································································13
Configuring a null interface ······························································································································13
Configuring an inloopback interface·················································································································14
Displaying and maintaining loopback, null, and inloopback interfaces ····························································14
Bulk configuring interfaces············································································ 15
Configuration restrictions and guidelines ·········································································································15
Configuration procedure ··································································································································15
Displaying and maintaining bulk interface configuration ··················································································16
Configuring the MAC address table ······························································ 17
Overview ··························································································································································17
How a MAC address entry is created·······································································································17
Types of MAC address entries·················································································································17
MAC address table configuration task list ········································································································18
Configuring MAC address entries ····················································································································19
Configuration guidelines···························································································································19
Adding or modifying a static or dynamic MAC address entry globally ·····················································19
Adding or modifying a static or dynamic MAC address entry on an interface··········································19
Adding or modifying a blackhole MAC address entry ··············································································20
Adding or modifying a multiport unicast MAC address entry ···································································20
Disabling MAC address learning······················································································································21
Disabling global MAC address learning ···································································································21
Disabling MAC address learning on an interface ·····················································································22
Disabling MAC address learning on a VLAN ···························································································22
Configuring the aging timer for dynamic MAC address entries········································································22
Configuring the MAC learning limit on an interface··························································································23
Configuring the device to forward unknown frames after the MAC learning limit on an interface is reached ··23
Assigning MAC learning priority to an interface ·······························································································24
Enabling MAC address synchronization ··········································································································25
Enable MAC address move notifications ·········································································································26
Enabling ARP fast update for MAC address moves ························································································27
Enabling SNMP notifications for the MAC address table·················································································28
Displaying and maintaining the MAC address table ························································································28
MAC address table configuration example ······································································································29
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Network requirements ······························································································································29
Configuration procedure···························································································································29
Verifying the configuration························································································································30
Configuring MAC Information········································································ 31
Enabling MAC Information ·······························································································································31
Configuring the MAC Information mode···········································································································31
Configuring the MAC change notification interval ····························································································32
Configuring the MAC Information queue length·······························································································32
MAC Information configuration example··········································································································32
Network requirements ······························································································································32
Configuration restrictions and guidelines ·································································································33
Configuration procedure···························································································································33
Configuring Ethernet link aggregation··························································· 35
Basic concepts·················································································································································35
Aggregation group, member port, and aggregate interface ·····································································35
Aggregation states of member ports in an aggregation group ·································································35
Operational key ········································································································································36
Configuration types ··································································································································36
Link aggregation modes···························································································································36
Aggregating links in static mode ······················································································································37
Choosing a reference port························································································································37
Setting the aggregation state of each member port ·················································································37
Aggregating links in dynamic mode ·················································································································38
LACP························································································································································38
How dynamic link aggregation works·······································································································39
Edge aggregate interface·································································································································42
Load sharing modes for link aggregation groups·····························································································42
Ethernet link aggregation configuration task list ······························································································42
Configuring an aggregation group ···················································································································43
Configuration restrictions and guidelines ·································································································43
Configuring a static aggregation group ····································································································43
Configuring a dynamic aggregation group ·······························································································44
Configuring an aggregate interface··················································································································45
Configuring the description of an aggregate interface ·············································································45
Specifying ignored VLANs for a Layer 2 aggregate interface ··································································45
Setting the minimum and maximum numbers of Selected ports for an aggregation group ·····················46
Setting the expected bandwidth for an aggregate interface·····································································46
Configuring an edge aggregate interface·································································································47
Enabling BFD for an aggregation group···································································································47
Shutting down an aggregate interface ·····································································································48
Restoring the default settings for an aggregate interface ········································································48
Configuring load sharing for link aggregation groups ······················································································49
Setting load sharing modes for link aggregation groups ··········································································49
Enabling local-first load sharing for link aggregation················································································49
Configuring per-flow load sharing algorithm settings for Ethernet link aggregation ·································50
Enabling link-aggregation traffic redirection·····································································································51
Configuration restrictions and guidelines ·································································································51
Configuration procedure···························································································································51
Displaying and maintaining Ethernet link aggregation ·····················································································52
Ethernet link aggregation configuration examples ···························································································52
Layer 2 static aggregation configuration example····················································································52
Layer 2 dynamic aggregation configuration example···············································································54
Layer 2 aggregation load sharing configuration example ········································································56
Layer 2 edge aggregate interface configuration example ········································································58
Configuring port isolation ·············································································· 61
Assigning a port to an isolation group··············································································································61
Displaying and maintaining port isolation·········································································································61
Port isolation configuration example ················································································································62
Network requirements ······························································································································62
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Configuration procedure···························································································································62
Verifying the configuration························································································································62
Configuring spanning tree protocols ····························································· 64
STP ··································································································································································64
STP protocol packets ·······························································································································64
Basic concepts in STP ·····························································································································64
Calculation process of the STP algorithm ································································································65
RSTP ·······························································································································································71
PVST································································································································································71
MSTP ·······························································································································································71
MSTP features ·········································································································································72
MSTP basic concepts ······························································································································72
How MSTP works·····································································································································75
MSTP implementation on devices············································································································76
Protocols and standards ··································································································································76
Spanning tree configuration task lists ··············································································································76
STP configuration task list························································································································77
RSTP configuration task list ·····················································································································78
PVST configuration task list ·····················································································································78
MSTP configuration task list·····················································································································79
Setting the spanning tree mode ·······················································································································80
Configuring an MST region ······························································································································80
Configuring the root bridge or a secondary root bridge ···················································································81
Configuring the current device as the root bridge of a specific spanning tree ·········································82
Configuring the current device as a secondary root bridge of a specific spanning tree···························82
Configuring the device priority ·························································································································82
Configuring the maximum hops of an MST region···························································································83
Configuring the network diameter of a switched network ················································································83
Configuring spanning tree timers ·····················································································································84
Configuration restrictions and guidelines ·································································································84
Configuration procedure···························································································································84
Configuring the timeout factor··························································································································85
Configuring the BPDU transmission rate ·········································································································85
Configuring edge ports·····································································································································86
Configuration restrictions and guidelines ·································································································86
Configuration procedure···························································································································86
Configuring path costs of ports ························································································································86
Specifying a standard for the device to use when it calculates the default path cost ······························87
Configuring path costs of ports ················································································································88
Configuration example ·····························································································································89
Configuring the port priority······························································································································89
Configuring the port link type ···························································································································90
Configuration restrictions and guidelines ·································································································90
Configuration procedure···························································································································90
Configuring the mode a port uses to recognize and send MSTP packets ·······················································90
Enabling outputting port state transition information························································································91
Enabling the spanning tree feature ··················································································································91
Enabling the spanning tree feature in STP/RSTP/MSTP mode·······························································92
Enabling the spanning tree feature in PVST mode ··················································································92
Performing mCheck ·········································································································································92
Configuration restrictions and guidelines ·································································································93
Configuration procedure···························································································································93
Configuring Digest Snooping ···························································································································93
Configuration restrictions and guidelines ·································································································94
Configuration procedure···························································································································94
Digest Snooping configuration example···································································································94
Configuring No Agreement Check ···················································································································95
Configuration prerequisites ······················································································································96
Configuration procedure···························································································································97
No Agreement Check configuration example···························································································97
Configuring TC Snooping·································································································································97
iv
Configuration restrictions and guidelines ·································································································98
Configuration procedure···························································································································98
Configuring protection functions ······················································································································98
Enabling BPDU guard ······························································································································99
Enabling root guard··································································································································99
Enabling loop guard ·······························································································································100
Configuring port role restriction ··············································································································100
Configuring TC-BPDU transmission restriction ······················································································101
Enabling TC-BPDU guard ······················································································································101
Enabling BPDU drop ······························································································································102
Displaying and maintaining the spanning tree ·······························································································102
Spanning tree configuration example ············································································································103
MSTP configuration example ·················································································································103
PVST configuration example··················································································································107
Configuring loop detection ·········································································· 110
Overview ························································································································································110
Loop detection mechanism ····················································································································110
Loop detection interval ···························································································································111
Loop protection actions ··························································································································111
Port status auto recovery ·······················································································································111
Loop detection configuration task list·············································································································112
Enabling loop detection··································································································································112
Enabling loop detection globally·············································································································112
Enabling loop detection on a port···········································································································112
Configuring the loop protection action ···········································································································113
Configuring the global loop protection action ·························································································113
Configuring the loop protection action on a Layer 2 Ethernet interface ·················································113
Configuring the loop protection action on a Layer 2 aggregate interface···············································113
Setting the loop detection interval··················································································································113
Displaying and maintaining loop detection·····································································································114
Loop detection configuration example ···········································································································114
Network requirements ····························································································································114
Configuration procedure·························································································································114
Verifying the configuration······················································································································115
Configuring VLANs ····················································································· 117
Overview ························································································································································117
VLAN frame encapsulation ····················································································································117
Protocols and standards ························································································································118
Configuring basic VLAN settings ···················································································································118
Configuring basic settings of a VLAN interface······························································································119
Configuring port-based VLANs ······················································································································120
Introduction ············································································································································120
Assigning an access port to a VLAN······································································································121
Assigning a trunk port to a VLAN ···········································································································122
Assigning a hybrid port to a VLAN ·········································································································122
Configuring MAC-based VLANs ····················································································································123
Introduction ············································································································································123
Configuration restrictions and guidelines ·······························································································126
Configuring static MAC-based VLAN assignment··················································································126
Configuring dynamic MAC-based VLAN assignment·············································································127
Configuring server-assigned MAC-based VLAN····················································································127
Configuring IP subnet-based VLANs ·············································································································128
Configuring protocol-based VLANs················································································································129
Configuring a VLAN group ·····························································································································130
Displaying and maintaining VLANs ················································································································131
VLAN configuration examples························································································································131
Port-based VLAN configuration example ·······························································································131
MAC-based VLAN configuration example······························································································133
IP subnet-based VLAN configuration example ······················································································135
Protocol-based VLAN configuration example ························································································136
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Configuring super VLANs ··········································································· 140
Super VLAN configuration task list ················································································································140
Creating a sub-VLAN ·····································································································································140
Configuring a super VLAN ·····························································································································140
Configuring a super VLAN interface ··············································································································141
Displaying and maintaining super VLANs ······································································································141
Super VLAN configuration example ···············································································································142
Network requirements ····························································································································142
Configuration procedure·························································································································142
Verifying the configuration······················································································································143
Configuring the private VLAN ····································································· 145
Configuration task list·····································································································································145
Configuration restrictions and guidelines ·······································································································146
Configuration procedure ································································································································146
Displaying and maintaining the private VLAN································································································148
Private VLAN configuration examples ···········································································································148
Promiscuous port configuration example ·······························································································148
Trunk promiscuous port configuration example ·····················································································151
Trunk promiscuous and trunk secondary port configuration example····················································154
Secondary VLAN Layer 3 communication configuration example ·························································159
Configuring voice VLANs ············································································ 162
Overview ························································································································································162
Methods of identifying IP phones···················································································································162
Identifying IP phones through OUI addresses ·······················································································162
Automatically identifying IP phones through LLDP ················································································163
Advertising the voice VLAN information to IP phones ···················································································163
IP phone access methods······························································································································164
Connecting the host and the IP phone in series ····················································································164
Connecting the IP phone to the device ··································································································164
Configuring a voice VLAN on a port···············································································································164
Voice VLAN assignment modes·············································································································164
Security mode and normal mode of voice VLANs··················································································166
Configuration prerequisites ····················································································································167
Configuring the QoS priority settings for voice traffic ·············································································167
Configuring a port to operate in automatic voice VLAN assignment mode············································168
Configuring a port to operate in manual voice VLAN assignment mode················································169
Enabling LLDP for automatic IP phone discovery··························································································170
Configuration prerequisites ····················································································································170
Configuration restrictions and guidelines ·······························································································170
Configuration procedure·························································································································170
Configuring LLDP or CDP to advertise a voice VLAN ···················································································170
Dynamically advertising an authorization VLAN through LLDP or CDP ························································171
Displaying and maintaining voice VLANs ······································································································172
Voice VLAN configuration examples··············································································································172
Automatic voice VLAN assignment mode configuration example··························································172
Manual voice VLAN assignment mode configuration example ······························································174
Configuring MVRP ······················································································ 176
MRP ·······························································································································································176
MRP implementation······························································································································176
MRP messages······································································································································176
MRP timers ············································································································································178
MVRP registration modes ······························································································································179
Protocols and standards ································································································································179
MVRP configuration task list ··························································································································179
Configuration restrictions and guidelines ·······································································································179
Configuration prerequisites ····························································································································180
Enabling MVRP··············································································································································180
Setting an MVRP registration mode···············································································································181
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Setting MRP timers ········································································································································181
Enabling GVRP compatibility ·························································································································182
Displaying and maintaining MVRP·················································································································182
MVRP configuration example ························································································································182
Network requirements ····························································································································182
Configuration procedure·························································································································183
Verifying the configuration······················································································································186
Configuring QinQ ························································································ 193
Overview ························································································································································193
How QinQ works ····································································································································193
QinQ implementations····························································································································194
Protocols and standards ························································································································194
Restrictions and guidelines ····························································································································195
Enabling QinQ················································································································································195
Configuring transparent transmission for VLANs···························································································195
Configuring the TPID in VLAN tags ···············································································································196
Configuring the CVLAN TPID·················································································································197
Configuring the SVLAN TPID·················································································································197
Setting the 802.1p priority in SVLAN tags······································································································197
Displaying and maintaining QinQ···················································································································198
QinQ configuration examples·························································································································199
Basic QinQ configuration example·········································································································199
VLAN transparent transmission configuration example ·········································································201
Configuring VLAN mapping ········································································ 203
Overview ························································································································································203
Application scenario of one-to-one and many-to-one VLAN mapping ···················································203
Application scenario of one-to-two and two-to-two VLAN mapping ·······················································205
VLAN mapping implementations············································································································205
General configuration restrictions and guidelines ··························································································208
VLAN mapping configuration task list ············································································································208
Configuring one-to-one VLAN mapping ·········································································································209
Configuring many-to-one VLAN mapping ······································································································209
Configuring many-to-one VLAN mapping in a network with dynamic IP address assignment···············210
Configuring many-to-one VLAN mapping in a network with static IP address assignment····················212
Configuring one-to-two VLAN mapping ·········································································································214
Configuring two-to-two VLAN mapping··········································································································214
Displaying and maintaining VLAN mapping ···································································································215
VLAN mapping configuration examples·········································································································215
One-to-one and many-to-one VLAN mapping configuration example ···················································215
One-to-two and two-to-two VLAN mapping configuration example ·······················································220
Configuring LLDP························································································ 223
Overview ························································································································································223
Basic concepts ·······································································································································223
Working mechanism·······························································································································228
Protocols and standards ························································································································229
LLDP configuration task list ···························································································································229
Performing basic LLDP configurations···········································································································229
Enabling LLDP ·······································································································································229
Configuring the LLDP bridge mode········································································································230
Setting the LLDP operating mode ··········································································································230
Setting the LLDP reinitialization delay····································································································231
Enabling LLDP polling····························································································································231
Configuring the advertisable TLVs ·········································································································232
Configuring the management address and its encoding format·····························································233
Setting other LLDP parameters··············································································································234
Setting an encapsulation format for LLDP frames ·················································································235
Configuring CDP compatibility ·······················································································································235
Configuration prerequisites ····················································································································236
Configuration procedure·························································································································236
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Configuring LLDP trapping and LLDP-MED trapping ····················································································237
Displaying and maintaining LLDP ··················································································································237
LLDP configuration examples ························································································································238
Basic LLDP configuration example ········································································································238
CDP-compatible LLDP configuration example·······················································································242
Configuring service loopback groups·························································· 245
Configuration procedure ································································································································245
Displaying and maintaining service loopback groups ····················································································245
Service loopback group configuration example ·····························································································246
Network requirements ····························································································································246
Configuration procedure·························································································································246
Document conventions and icons ······························································· 247
Conventions ···················································································································································247
Network topology icons··································································································································248
Support and other resources ······································································ 249
Accessing Hewlett Packard Enterprise Support ····························································································249
Accessing updates·········································································································································249
Websites ················································································································································250
Customer self repair·······························································································································250
Remote support······································································································································250
Documentation feedback ·······················································································································250
Index ··········································································································· 252
1
Configuring Ethernet interfaces
The switch series supports Ethernet interfaces, management Ethernet interfaces, Console
interfaces, and USB interfaces. For the interface types and the number of interfaces supported by a
switch model, see the installation guide.
This document describes how to configure management Ethernet interfaces and Ethernet interfaces.
Configuring a management Ethernet interface
A management interface uses an RJ-45 connector. You can connect the interface to a PC for
software loading and system debugging, or connect it to a remote NMS for remote system
management.
Support for management Ethernet interfaces depends on the device model. For more information,
see the installation guide.
To configure a management Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter management
Ethernet interface view.
interface
M-GigabitEthernet
interface-number
N/A
3. (Optional.) Set the
interface description. description text The default setting is
M-GigabitEthernet0/0/0 Interface.
4. (Optional.) Shut down
the interface. shutdown By default, the management Ethernet
interface is up.
Ethernet interface naming conventions
The Ethernet interfaces 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. If the switch is not in an IRF fabric, A is 1 by default.
•B—Card slot number. 0indicates the interface is a fixed interface of the switch. 1indicates the
interface is on expansion interface-card 1. 2indicates the interface is on expansion
interface-card 2.
•C—Port index.
Configuring common Ethernet interface settings
Configuring basic settings 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
2
Step Command Remarks
3. Set the interface
description. description text
The default setting is in the format of
interface-name Interface. For example,
GigabitEthernet1/0/1 Interface.
4. Set the duplex mode of
the Ethernet interface. duplex { auto | full | half }
The default setting is auto for Ethernet
interfaces.
Copper ports operating at 1000 Mbps or
10 Gbps and fiber ports do not support the
half keyword.
5. Set the port speed. speed { 10 | 100 |1000 |10000
|40000 | auto }
The default setting is auto for Ethernet
interfaces.
Support for the keywords depends on the
interface type. For more information, see
Layer 2—LAN Switching Command
Reference.
Interfaces on an HPE 5130/5510 10GbE
SFP+ 2-port Module (JH157A) or HPE
5130/5510 10GBASE-T 2-port Module
(JH156A) interface card support only the
10000 keyword.
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 jumbo frame support
An Ethernet interface might receive some frames larger than the standard Ethernet frame size during
high-throughput data exchanges, such as file transfers. These frames are called jumbo frames.
The interface processes jumbo frames in the following ways:
•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
performs the following operations:
{Processes jumbo frames within the specified length.
{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 switch allows jumbo
frames within 10000 bytes to pass
through all Ethernet interfaces.
3
Configuring physical state change suppression on an
Ethernet interface
IMPORTANT:
Do not configure physical state change suppression on an Ethernet interface that has RRPP, 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 comes up or goes down, the interface immediately reports the change to the CPU. The CPU
then performs the following operations:
•Notifies the upper-layer protocol modules (such as routing and forwarding modules) of the
change for guiding packet forwarding.
•Automatically generates traps and logs, informing the user to take the correct 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 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 not reported to the CPU unless the interface is still 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.
4
Loopback tests include the following types:
•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
switch 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, mdix-mode, 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
CAUTION:
Configuring generic flow control on an Ethernet interface will cause link-up and link-down events
before the interface finally stays up.
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
5
Step Command Remarks
2. Enter Ethernet interface
view. interface interface-type
interface-number N/A
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.
Enabling energy saving features on an Ethernet interface
Enabling auto power-down on an Ethernet interface
IMPORTANT:
Fiber ports do not support this feature.
When the auto power-down feature is enabled on an interface and the interface has been down for a
certain period of time, both of the following events occur:
•The switch automatically stops supplying power to the interface.
•The interface enters the power save mode.
The time period depends on the chip specifications and is not configurable.
When the interface comes up, both of the following events occur:
•The switch automatically restores power supply to the interface.
•The interface enters its normal state.
To enable auto power-down 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 auto power-down. port auto-power-down By default, auto power-down is
disabled.
Enabling EEE energy saving for Ethernet interfaces in up state
IMPORTANT:
Fiber ports do not support this feature.
With the Energy Efficient Ethernet (EEE) energy saving feature, a link-up port enters the low power
state if it has not received any packet for a certain period of time. The time period depends on the
chip specifications and is not configurable. When a packet arrives later, the switch automatically
restores power supply to the interface and the port enters the normal state.
To enable EEE energy saving:
Step Command Remarks
1. Enter system view. system-view N/A
6
Step Command Remarks
2. Enter Ethernet interface
view. interface interface-type
interface-number N/A
3. Enable EEE energy
saving. eee enable By default, EEE energy
saving is disabled.
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.
Enabling automatic negotiation for speed downgrading
Perform this task to enable interfaces at two ends of a link to automatically negotiate about
downgrading their speed when the following conditions exist:
•The interfaces automatically negotiate a speed of 1000 Mbps.
•The interfaces cannot operate at 1000 Mbps because of link restrictions.
This command is applicable only to GE interfaces.
To enable automatic negotiation for speed downgrading:
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 automatic
negotiation for speed
downgrading. speed auto downgrade By default, automatic negotiation
for speed downgrading is
enabled.
Configuring a Layer 2 Ethernet interface
Configuring storm suppression
You can use the storm suppression feature to limit the size of a particular type of traffic (broadcast,
multicast, or unknown unicast traffic) on an interface. When the broadcast, multicast, or unknown
unicast traffic on the interface exceeds this threshold, the system discards packets until the traffic
drops below this threshold.
7
Any of the storm-constrain, broadcast-suppression, multicast-suppression, and
unicast-suppression commands can suppress storm on a port. The broadcast-suppression,
multicast-suppression, and unicast-suppression commands suppress traffic in hardware. They
have less impact on device performance than the storm-constrain command, which performs
suppression in software.
Configuration guidelines
For the same type of traffic, do not configure the storm constrain command together with any of the
broadcast-suppression, multicast-suppression, and unicast-suppression commands.
Otherwise, the traffic suppression result is not determined. For more information about the
storm-constrain command, see "Configuring storm control on an Ethernet interface."
When you configure the suppression threshold in kbps, the actual suppression threshold might be
different from the configured one as follows:
•If the configured value is smaller than 64, the value of 64 takes effect.
•If the configured value is greater than 64 but not an integer multiple of 64, the integer multiple of
64 that is greater than and closest to the configured value takes effect.
For the suppression threshold that takes effect, see the prompt on the switch.
Configuration procedure
To set storm suppression thresholds on one or multiple Ethernet interfaces:
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 broadcast
suppression and set the
broadcast suppression
threshold.
broadcast-suppression { ratio |
pps max-pps | kbps max-kbps }
By default, broadcast traffic is
allowed to pass through an
interface.
4. Enable multicast
suppression and set the
multicast suppression
threshold.
multicast-suppression { ratio |
pps max-pps | kbps max-kbps }
By default, multicast traffic is
allowed to pass through an
interface.
5. Enable unknown unicast
suppression and set the
unknown unicast
suppression threshold.
unicast-suppression { ratio |pps
max-pps | kbps max-kbps }
By default, unknown unicast traffic
is allowed to pass through an
interface.
Configuring storm control on an Ethernet interface
IMPORTANT:
The known unicast storm control feature is available in Release 1121 and later.
Storm control compares broadcast, multicast, unknown unicast traffic, and known unicast traffic
regularly with their respective traffic thresholds on an Ethernet interface. For each type of traffic,
storm control provides a lower threshold and a higher threshold.
For management purposes, you can configure the interface to output threshold event traps and log
messages when monitored traffic meets one of the following conditions:
•Exceeds the upper threshold.
•Falls below the lower threshold from the upper threshold.
8
Depending on your configuration, when a particular type of traffic exceeds its upper threshold, the
interface does either of the following:
•Blocks this type of traffic, while forwarding other types of traffic—Even though the
interface does not forward the blocked traffic, it still counts the traffic. When the blocked traffic
drops below the lower threshold, the port begins to forward the traffic.
•Goes down automatically—The interface goes down automatically and stops forwarding any
traffic. When the blocked traffic is detected dropping below the lower threshold, the port does
not forward the traffic. To bring up the interface, use the undo shutdown command or disable
the storm control feature.
Any of the storm-constrain, broadcast-suppression, multicast-suppression, and
unicast-suppression commands can suppress storm on a port. The broadcast-suppression,
multicast-suppression, and unicast-suppression commands suppress traffic in hardware, and
have less impact on device performance than the storm-constrain command, which performs
suppression in software.
Storm control uses a complete polling cycle to collect traffic data, and analyzes the data in the next
cycle. An interface takes one to two polling intervals to take a storm control action.
Configuration guidelines
For the same type of traffic, do not configure the storm constrain command together with any of the
broadcast-suppression, multicast-suppression, and unicast-suppression commands.
Otherwise, the traffic suppression result is not determined. For more information about the
broadcast-suppression, multicast-suppression, and unicast-suppression commands, see
"Configuring storm suppression."
Configuration procedure
To configure storm control on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. (Optional.) Set the traffic
polling interval of the storm
control module.
storm-constrain interval
seconds
The default setting is 10 seconds.
For network stability, use the
default or set a higher traffic
polling interval (10 seconds).
3. Enter Ethernet interface
view. interface interface-type
interface-number N/A
4. (Optional.) Enable storm
control, and set the lower
and upper thresholds for
broadcast, multicast, or
unknown unicast traffic.
storm-constrain {broadcast |
known-unicast |multicast |
unicast }{pps |kbps |ratio }
max-pps-values min-pps-values
By default, storm control is
disabled.
The known-unicast key word is
available in Release 1121 and
later.
5. Set the control action to take
when monitored traffic
exceeds the upper
threshold.
storm-constrain control {block
|shutdown }
By default, storm control is
disabled.
6. (Optional.) Enable the
interface to log storm control
threshold events. storm-constrain enable log
By default, the interface outputs
log messages when monitored
traffic exceeds the upper
threshold or falls below the lower
threshold from the upper
threshold.
7. (Optional.) Enable the
interface to send storm
control threshold event
traps.
storm-constrain enable trap
By default, the interface sends
traps when monitored traffic
exceeds the upper threshold or
drops below the lower threshold
9
Step Command Remarks
from the upper threshold.
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:
Copper ports do not support this feature.
As shown in Figure 1, 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 1 Forcibly bring up a fiber port
Configuration restrictions and guidelines
When you forcibly bring up a fiber port, follow these guidelines:
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
GE1/0/1
GE1/0/1
Device A
Device B
GE1/0/1
GE1/0/1
Device A
Device B
GE1/0/1
GE1/0/1
Device A
Device B
The interface is down.Packets
10
•The port up-mode command is mutually exclusive with either of the shutdown and
commands.
•A GE fiber port cannot correctly forward traffic if you configure the port up-mode command on
the port and install an electro-optical module, 100/1000-Mbps transceiver module, or 100-Mbps
transceiver module into the port. To solve the problem, use the undo port up-mode command
on the 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
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.
Setting the MDIX mode of an Ethernet interface
IMPORTANT:
Fiber ports do not support the MDIX mode setting.
A physical Ethernet interface contains eight pins, each of which plays a dedicated role. For example,
pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. You can use both crossover and
straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these
types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent
Interface-Crossover (MDIX) modes:
•MDIX mode—Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.
•MDI mode—Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.
•AutoMDIX mode—The interface negotiates pin roles with its peer.
To enable the interface to communicate with its peer, set the MDIX mode of the interface mode by
using the following guidelines:
•Typically, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface
to MDI or MDIX only when the switch cannot determine the cable type.
•When a straight-through cable is used, set the interface to operate in the MDIX mode different
than its peer.
•When a crossover cable is used, perform either of the following tasks:
{Set the interface to operate in the same MDIX mode as its peer.
{Set either end to operate in AutoMDIX mode.
To set the MDIX 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
11
Step Command Remarks
3. Set the MDIX mode of the
Ethernet interface. mdix-mode {automdix |mdi |
mdix }
By default, a copper Ethernet
interface operates in auto mode to
negotiate pin roles with its peer.
Testing the cable connection of an Ethernet interface
IMPORTANT:
•If the link of an Ethernet port is up, testing its cable connection will cause the link to go down and
then come up.
•Fiber ports do not support this feature.
This feature tests the cable connection of an Ethernet interface and displays cable test results within
5 seconds. The test results include the cable's status and some physical parameters. If any fault is
detected, the test results include the length of the faulty cable segment.
To test the cable connection of an Ethernet interface:
Step Command
1. Enter system view. system-view
2. Enter Ethernet interface view. interface interface-type interface-number
3. Test the cable connected to the Ethernet
interface. virtual-cable-test
Enabling bridging on an Ethernet interface
When a packet arrives at an interface, the switch looks up the destination MAC address of the packet
in the MAC address table. If an entry is found and the outgoing interface is the same as the incoming
interface, the switch drops the packet.
To enable the switch to forward such packets rather than drop them, enable the bridging feature on
the Ethernet interface.
To enable bridging 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 bridging on the
Ethernet interface. port bridge enable By default, bridging is disabled.
Displaying and maintaining an Ethernet interface
Execute display commands in any view and reset commands in user view.
Task Command
Display interface traffic statistics. display counters {inbound |outbound }interface
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