HP 3100 Series User manual
HPE 3100 v2 Switch Series
Layer 2—LAN Switching
Configuration Guide
Part number: 5998-5991s
Software version: Release 5213 and Release 5213P02
Document version: 6W101-20160506
© Copyright 2016 Hewlett Packard Enterprise Development LP
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Acknowledgments
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Contents
Configuring Ethernet interfaces ······································································ 1
Ethernet interface naming conventions··············································································································1
Configuring a combo interface ···························································································································1
Configuration prerequisites ························································································································1
Changing the active port of a combo interface···························································································1
Configuring basic settings of an Ethernet interface ···························································································1
Shutting down an Ethernet interface··················································································································2
Setting speed options for auto negotiation on an Ethernet interface ·································································3
Configuration restrictions and guidelines ···································································································3
Configuration procedure·····························································································································4
Configuring flow control on an Ethernet interface ······························································································4
Configuring link state change suppression on an Ethernet interface ·································································5
Configuring link-down event suppression ··································································································5
Configuring link-up event suppression ·······································································································6
Configuring loopback testing on an Ethernet interface ······················································································6
Configuration restrictions and guidelines ···································································································6
Configuration procedure·····························································································································6
Configuring jumbo frame support·······················································································································7
Configuring a port group ····································································································································7
Configuring storm suppression ··························································································································8
Setting the statistics polling interval ···················································································································8
Enabling loopback detection on an Ethernet interface·······················································································9
Configuration restrictions and guidelines ·································································································10
Configuration procedure···························································································································10
Setting the MDI mode of an Ethernet interface································································································11
Testing the cable connection of an Ethernet interface·····················································································12
Configuring storm control on an Ethernet interface ·························································································12
Configuration restrictions and guidelines ·································································································13
Configuration procedure···························································································································13
Displaying and maintaining an Ethernet interface····························································································14
Configuring loopback and null interfaces ······················································ 15
Configuring a loopback interface ·····················································································································15
Introduction to the loopback interface ······································································································15
Configuration procedure···························································································································15
Configuring a null interface ······························································································································16
Introduction to the null interface ···············································································································16
Configuration procedure···························································································································16
Displaying and maintaining loopback and null interfaces ················································································16
Bulk configuring interfaces············································································ 18
Configuration guidelines ··································································································································18
Configuration procedure ··································································································································18
Configuring the MAC address table ······························································ 19
Overview ··························································································································································19
How a MAC address table entry is created······························································································19
Types of MAC address table entries ········································································································20
MAC address table-based frame forwarding····························································································20
Configuring static, dynamic, and blackhole MAC address table entries ··························································20
Configuring a static or dynamic MAC address table entry in system view···············································20
Configuring a static or dynamic MAC address table entry in interface view ············································21
Configuring a blackhole MAC address entry····························································································21
Disabling MAC address learning······················································································································21
Disabling MAC address learning on ports································································································21
Disabling MAC address learning on a VLAN (available only on the HPE 3100 v2 EI)·····························22
Configuring the aging timer for dynamic MAC address entries········································································22
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Configuring the MAC learning limit on ports ····································································································23
Enabling MAC address migration log notifying ································································································23
Displaying and maintaining MAC address tables·····························································································24
MAC address table configuration example ······································································································24
Network requirements ······························································································································24
Configuration procedure···························································································································25
Configuring MAC Information········································································ 26
Overview ··························································································································································26
Introduction to MAC Information ··············································································································26
How MAC Information works····················································································································26
Enabling MAC Information globally ··················································································································26
Enabling MAC Information on an interface ······································································································26
Configuring MAC Information mode·················································································································27
Configuring the interval for sending Syslog or trap messages·········································································27
Configuring the MAC Information queue length·······························································································27
MAC Information configuration example··········································································································28
Network requirements ······························································································································28
Configuration procedure···························································································································28
Configuring Ethernet link aggregation··························································· 29
Overview ··························································································································································29
Basic concepts ·········································································································································29
Aggregating links in static mode ··············································································································32
Aggregating links in dynamic mode ·········································································································33
Load-sharing criteria for link aggregation groups·····················································································34
Configuration restrictions and guidelines ·········································································································35
Ethernet link aggregation configuration task list ······························································································35
Configuring an aggregation group ···················································································································35
Configuration guidelines···························································································································35
Configuring a static aggregation group ····································································································36
Configuring a dynamic aggregation group ·······························································································37
Configuring an aggregate interface··················································································································38
Configuring the description of an aggregate interface ·············································································38
Enabling link state traps for an aggregate interface·················································································38
Limiting the number of Selected ports for an aggregation group ·····························································38
Shutting down an aggregate interface ·····································································································39
Restoring the default settings for an aggregate interface ········································································39
Configuring load sharing for link aggregation groups ······················································································40
Configuring load-sharing criteria for link aggregation groups···································································40
Displaying and maintaining Ethernet link aggregation ·····················································································40
Ethernet link aggregation configuration examples ···························································································41
Layer 2 static aggregation configuration example····················································································41
Layer 2 dynamic aggregation configuration example···············································································43
Configuring port isolation ·············································································· 46
Assigning a port to the isolation group·············································································································46
Displaying and maintaining the isolation group································································································46
Port isolation configuration example ················································································································46
Configuring spanning tree protocols ····························································· 48
STP ··································································································································································48
STP protocol packets ·······························································································································48
Basic concepts in STP ·····························································································································49
Calculation process of the STP algorithm ································································································50
RSTP ·······························································································································································55
PVST································································································································································55
MSTP ·······························································································································································55
STP, RSTP, and PVST limitations ···········································································································55
MSTP features ·········································································································································55
MSTP basic concepts ······························································································································56
How MSTP works·····································································································································60
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Implementation of MSTP on devices ·······································································································60
Protocols and standards ··································································································································60
Spanning tree configuration task list ················································································································61
Configuration restrictions and guidelines ·································································································61
STP configuration task list························································································································61
RSTP configuration task list ·····················································································································62
PVST configuration task list ·····················································································································63
MSTP configuration task list·····················································································································64
Setting the spanning tree mode ·······················································································································65
Configuring an MST region ······························································································································65
Configuration restrictions and guidelines ·································································································66
Configuration procedure···························································································································66
Configuring the root bridge or a secondary root bridge ···················································································66
Configuration restrictions and guidelines ·································································································67
Configuring the current device as the root bridge of a specific spanning tree ·········································67
Configuring the current device as a secondary root bridge of a specific spanning tree···························67
Configuring the device priority ·························································································································68
Configuring the maximum hops of an MST region···························································································68
Configuring the network diameter of a switched network ················································································69
Configuring spanning tree timers ·····················································································································69
Configuration restrictions and guidelines ·································································································70
Configuration procedure···························································································································70
Configuring the timeout factor··························································································································70
Configuring the maximum port rate··················································································································71
Configuring edge ports·····································································································································71
Configuration restrictions and guidelines ·································································································72
Configuration procedure···························································································································72
Configuring path costs of ports ························································································································72
Specifying a standard for the device to use when it calculates the default path cost ······························72
Configuring path costs of ports ················································································································74
Configuration example ·····························································································································74
Configuring the port priority······························································································································75
Configuring the port link type ···························································································································75
Configuration restrictions and guidelines ·································································································75
Configuration procedure···························································································································76
Configuring the mode a port uses to recognize/send MSTP packets ······························································76
Enabling outputting port state transition information························································································77
Enabling the spanning tree feature ··················································································································77
Configuration restrictions and guidelines ·································································································77
Enabling the spanning tree feature (in STP/RSTP/MSTP mode) ····························································78
Enabling the spanning tree feature (in PVST mode)················································································78
Performing mCheck ·········································································································································79
Performing mCheck globally ····················································································································79
Performing mCheck in interface view·······································································································79
Configuring Digest Snooping ···························································································································79
Configuration restrictions and guidelines ·································································································80
Configuration procedure···························································································································80
Digest Snooping configuration example···································································································80
Configuring No Agreement Check ···················································································································81
Configuration prerequisites ······················································································································82
Configuration procedure···························································································································82
No Agreement Check configuration example···························································································83
Configuring TC snooping ·································································································································83
Configuration restrictions and guidelines ·································································································84
Configuration procedure···························································································································84
Configuring protection functions ······················································································································84
Configuration prerequisites ······················································································································85
Enabling BPDU guard ······························································································································85
Enabling root guard··································································································································86
Enabling loop guard ·································································································································87
Enabling TC-BPDU guard ························································································································87
Enabling BPDU drop ································································································································88
iv
Disabling the device to reactivate edge ports shut down by BPDU guard·······················································88
Enabling SNMP notifications for PVST topology changes ···············································································89
Displaying and maintaining the spanning tree ·································································································89
Spanning tree configuration examples·············································································································90
MSTP configuration example ···················································································································90
PVST configuration example····················································································································93
Configuring BPDU tunneling (available only on the HPE 3100 v2 EI) ·········· 97
Overview ··························································································································································97
Background ··············································································································································97
BPDU tunneling implementation ··············································································································98
Enabling BPDU tunneling ································································································································99
Configuration prerequisites ······················································································································99
Configuration restrictions and guidelines ·································································································99
Configuration procedure···························································································································99
Configuring destination multicast MAC address for BPDUs ··········································································100
BPDU tunneling configuration examples ·······································································································100
BPDU tunneling for STP configuration example ····················································································100
BPDU tunneling for PVST configuration example··················································································102
Configuring VLANs ····················································································· 104
Overview ························································································································································104
VLAN fundamentals ·······························································································································104
VLAN types ············································································································································105
Protocols and standards ························································································································106
Configuring basic VLAN settings ···················································································································106
Configuration restrictions and guidelines ·······························································································106
Configuration procedure·························································································································106
Configuring basic settings of a VLAN interface······························································································106
Configuration procedure·························································································································107
Configuring port-based VLANs ······················································································································107
Introduction to port-based VLAN············································································································107
Assigning an access port to a VLAN······································································································109
Assigning a trunk port to a VLAN ···········································································································110
Assigning a hybrid port to a VLAN ·········································································································111
Port-based VLAN configuration example ·······························································································112
Configuring MAC-based VLANs ····················································································································114
Introduction to MAC-based VLAN ··········································································································114
Configuration restrictions and guidelines ·······························································································114
Configuration procedure·························································································································115
MAC-based VLAN configuration example······························································································116
Configuring protocol-based VLANs (available only on the HPE 3100 v2 EI) ·················································118
Introduction to protocol-based VLAN ·····································································································118
Configuration restrictions and guidelines ·······························································································118
Configuration procedure·························································································································118
Protocol-based VLAN configuration example ························································································119
Displaying and maintaining VLANs ················································································································122
Configuring a voice VLAN (available only on the HPE 3100 v2 EI) ············ 123
Overview ························································································································································123
Methods of identifying IP phones···················································································································123
Identifying IP phones through OUI addresses ·······················································································123
Automatically identifying IP phones through LLDP ························································································124
Advertising the voice VLAN information to IP phones ···················································································124
IP phone access methods······························································································································125
Connecting the host and the IP phone in series ····················································································125
Connecting the IP phone to the device ··································································································125
Configuring a voice VLAN on a port···············································································································125
Voice VLAN assignment modes·············································································································125
Security mode and normal mode of voice VLANs··················································································127
Configuration prerequisites ····························································································································128
Configuring QoS priority settings for voice traffic on an interface ··································································128
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Configuring a port to operate in automatic voice VLAN assignment mode····················································129
Configuration restrictions and guidelines ·······························································································129
Configuration procedure·························································································································129
Configuring a port to operate in manual voice VLAN assignment mode ·······················································130
Configuration restrictions and guidelines ·······························································································130
Configuration procedure·························································································································130
Enabling LLDP to automatically discover IP phones ·····················································································131
Configuration prerequisites ····················································································································131
Configuration restrictions and guidelines ·······························································································132
Configuration procedure·························································································································132
Configuring LLDP to advertise a specific voice VLAN ···················································································132
Dynamically advertising server-assigned VLANs through LLDP ···································································133
Overview ················································································································································133
Example of using 802.1X to authenticate IP phones ·············································································133
Displaying and maintaining voice VLANs ······································································································133
Voice VLAN configuration examples··············································································································134
Automatic voice VLAN mode configuration example ·············································································134
Manual voice VLAN assignment mode configuration example ······························································136
Configuring GVRP ······················································································ 138
Overview ························································································································································138
GARP ·····················································································································································138
GVRP ·····················································································································································141
Protocols and standards ························································································································141
GVRP configuration task list ··························································································································141
Configuring GVRP functions ··························································································································141
Configuration restrictions and guidelines ·······························································································142
Configuration procedure·························································································································142
Configuring the GARP timers·························································································································142
Displaying and maintaining GVRP ·················································································································143
GVRP configuration examples ·······················································································································144
GVRP normal registration mode configuration example ········································································144
GVRP fixed registration mode configuration example ···········································································145
GVRP forbidden registration mode configuration example ····································································147
Configuring QinQ ························································································ 149
Overview ························································································································································149
Background and benefits ·······················································································································149
How QinQ works ····································································································································149
QinQ frame structure······························································································································150
Implementations of QinQ ·······················································································································151
Modifying the TPID in a VLAN tag ·········································································································151
Protocols and standards ························································································································152
QinQ configuration task list ····························································································································152
Enabling basic QinQ ······································································································································153
Configuring selective QinQ (available only on the HPE 3100 v2 EI) ·····························································153
Configuring an outer VLAN tagging policy in the port-based approach ·················································153
Configuring an outer VLAN tagging policy in the QoS policy-based approach ······································154
Configuring the TPID value in VLAN tags ······································································································155
QinQ configuration examples·························································································································155
Basic QinQ configuration example·········································································································155
Selective QinQ configuration example in port-based approach ·····························································157
Selective QinQ configuration example in QoS policy-based approach··················································159
Configuring VLAN mapping (available only on the HPE 3100 v2 EI)·········· 163
Overview ························································································································································163
Application scenario of one-to-one VLAN mapping ···············································································163
Application scenario of many-to-one VLAN mapping·············································································163
Concepts and terms ·······························································································································164
One-to-one VLAN mapping implementation ··························································································165
Many-to-one VLAN mapping implementation ························································································166
Configuring one-to-one VLAN mapping with a global QoS policy··································································166
vi
Configuration prerequisites ····················································································································166
Configuring an uplink policy ···················································································································166
Configuring the customer-side port ········································································································167
Configuring the network-side port ··········································································································167
Configuring one-to-one VLAN mapping with port QoS policies ·····································································168
Configuration prerequisites ····················································································································168
Configuring an uplink policy ···················································································································168
Configuring a downlink policy·················································································································169
Configuring the customer-side port ········································································································169
Configuring the network-side port ··········································································································169
Configuring many-to-one VLAN mapping ······································································································170
Configuration prerequisites ····················································································································170
Configuring an uplink policy ···················································································································170
Configuring the customer-side port ········································································································171
Configuring the network-side port ··········································································································171
VLAN mapping configuration examples·········································································································171
One-to-one VLAN mapping configuration example················································································171
Many-to-one VLAN mapping configuration example··············································································173
Configuring LLDP························································································ 176
Overview ························································································································································176
Background ············································································································································176
Basic concepts ·······································································································································176
Working mechanism·······························································································································180
Protocols and standards ························································································································180
LLDP configuration task list ···························································································································181
Performing basic LLDP configuration ············································································································181
Enabling LLDP ·······································································································································181
Setting the LLDP operating mode ··········································································································181
Setting the LLDP reinitialization delay····································································································182
Enabling LLDP polling····························································································································182
Configuring the advertisable TLVs ·········································································································182
Configuring the management address and its encoding format·····························································183
Setting other LLDP parameters··············································································································183
Setting an encapsulation format for LLDP frames ·················································································184
Configuring CDP compatibility (available only on the HPE 3100 v2 EI) ························································185
Configuration prerequisites ····················································································································186
Configuration procedure·························································································································186
Configuring LLDP trapping·····························································································································187
Displaying and maintaining LLDP ··················································································································187
LLDP configuration examples ························································································································188
Basic LLDP configuration example ········································································································188
CDP-compatible LLDP configuration example (available only on the HPE 3100 v2 EI) ························190
Configuring MVRP ······················································································ 193
Overview ························································································································································193
Introduction to MRP ·······························································································································193
MVRP registration modes ······················································································································195
Protocols and standards ························································································································196
MVRP configuration task list ··························································································································196
Configuration prerequisites ····························································································································196
Enabling MVRP··············································································································································196
Configuration restrictions and guidelines ·······························································································196
Configuration procedure·························································································································196
Configuring the MVRP registration mode ······································································································197
Configuring MRP timers·································································································································197
Enabling GVRP compatibility ·························································································································198
Configuration restrictions and guidelines ·······························································································199
Configuration procedure·························································································································199
Displaying and maintaining MVRP·················································································································199
Configuration example for MVRP in normal registration mode······································································199
Network requirements ····························································································································199
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Configuration procedure·························································································································200
Document conventions and icons ······························································· 209
Conventions ···················································································································································209
Network topology icons··································································································································210
Support and other resources ······································································ 211
Accessing Hewlett Packard Enterprise Support ····························································································211
Accessing updates·········································································································································211
Websites ················································································································································212
Customer self repair·······························································································································212
Remote support······································································································································212
Documentation feedback ·······················································································································212
Index ··········································································································· 214
1
Configuring Ethernet interfaces
Ethernet interface naming conventions
The Ethernet interfaces on the HPE 3100 v2 EI are named in the format of interface-type A/B/C,
where the following definitions apply:
•A—Specifies the ID of a switch. The value can only be 1.
•B—Represents a slot number on the switch. It uses 0.
•C—Represents the number of an interface on a slot.
Configuring a combo interface
A combo interface is a logical interface that comprises one optical (fiber) port and one electrical
(copper) port. The two ports share one forwarding interface, so they cannot work simultaneously.
When you enable either port, the other port is automatically disabled.
The fiber combo port and the copper combo port share one interface view, in which you can activate
the fiber or copper combo port and configure other port attributes such as the interface rate and
duplex mode.
Configuration prerequisites
Before you configure combo interfaces, complete the following tasks:
•For the number of combo interfaces that an HPE 3100 v2 switch provides, see the installation
guide.
•Use the display interface command to determine which port (fiber or copper) of the combo
interface is active. If the current port is the copper port, the output will include "Media type is
twisted pair, Port hardware type is 1000_BASE_T". If the current port is the fiber port, the output
will not include the information mentioned above. You can also use the display this command
in the view of the combo interface to view the combo interface configuration. If the combo
enable fiber command exists, the fiber port is active; if the command does not exist, the copper
fiber is active.
Changing the active port of a combo interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter the Ethernet interface
view. interface interface-type
interface-number N/A
3. Activate the copper combo
port or fiber combo port. combo enable {copper |fiber }
Optional.
By default, the copper combo port
is active.
Configuring basic settings of an Ethernet interface
You can set an Ethernet interface to operate in one of the following duplex modes:
2
•Full-duplex mode (full)—Interfaces that operate in this mode can send and receive packets
simultaneously.
•Half-duplex mode (half)—Interfaces that operate in this mode cannot send and receive
packets simultaneously.
•Auto-negotiation mode (auto)—Interfaces that operate in this mode negotiate a duplex mode
with their peers.
You can set the speed of an Ethernet interface or enable it to automatically negotiate a speed with its
peer. For a 100-Mbps or 1000-Mbps Ethernet interface, you can also set speed options for auto
negotiation. The two ends can select a speed only from the available options. For more information,
see "Setting speed options for auto negotiation on an Ethernet interface."
To configure 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. Set the interface
description. description text
Optional.
By default, the description of an interface is in the
format of interface-name Interface. For example,
Ethernet1/0/1 Interface.
4. Set the duplex
mode of the
interface.
duplex { auto | full |
half }
Optional.
By default, the duplex mode is auto for Ethernet
interfaces.
The half keyword is not applicable to Ethernet copper
ports that are configured with a 1000-Mbps port speed
and fiber ports.
5. Set the port
speed. speed { 10 | 100 |1000 |
auto }
Optional.
By default, an Ethernet interface automatically
negotiates a speed with the peer.
The 10 and 100 keywords are not applicable to 10-GE
fiber ports.
6. Restore the
default settings for
the interface. default Optional.
NOTE:
Make sure that the fiber port speed matches the speed requirement of the inserted transceiver
module. For example, after you insert a 1000-Mbps transceiver module into a fiber port, configure
the port speed with the speed 1000 or speed auto command.
Shutting down an Ethernet interface
CAUTION:
Use this feature with caution. After you manually shut down an Ethernet interface, the Ethernet
interface cannot forward packets even if it is physically connected.
You might need to shut down and then bring up an Ethernet interface to activate some configuration
changes, for example, the speed or duplex mode changes.
3
To shut down an Ethernet interface or a group of Ethernet interfaces:
Step Command Remarks
1. Enter system
view. system-view N/A
2. Enter Ethernet
interface view or
port group view.
•Enter Ethernet interface view:
interface interface-type
interface-number
•Enter port group view:
port-group manual
port-group-name
Use any command.
To shut down an Ethernet interface,
enter Ethernet interface.
To shut down all Ethernet interfaces
in a port group, enter port group view.
3. Shut down the
Ethernet interface
or interfaces. shutdown By default, Ethernet interfaces are up.
Setting speed options for auto negotiation on an
Ethernet interface
Speed auto negotiation enables an Ethernet interface to negotiate with its peer for the highest speed
that both ends support by default. You can narrow down the speed option list for negotiation.
Figure 1 Speed auto negotiation application scenario
As shown in Figure 1, all ports on Switch A are operating in speed auto negotiation mode, with the
highest speed of 100 Mbps. If the transmission rate of each server in the server cluster is 100 Mbps,
their total transmission rate will exceed the capability of port Ethernet 1/0/4, the port providing access
to the Internet for the servers.
To avoid congestion on Ethernet 1/0/4, set 10 Mbps as the only option available for speed
negotiation on port Ethernet 1/0/1, Ethernet 1/0/2, and Ethernet 1/0/3. As a result, the transmission
rate on each port connected to a server is limited to 10 Mbps.
Configuration restrictions and guidelines
•Among the auto-negotiation-capable Layer 2 ports, the FE copper ports support only the 10 and
100 keywords, the GE copper ports support all keywords, and the GE fiber ports support only
the 100 and 1000 keywords.
Eth1/0/3
4
•The speed and speed auto commands supersede each other, and whichever is configured last
takes effect.
Configuration procedure
To set speed options for auto negotiation 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. Set speed options for auto
negotiation. speed auto { 10 | 100 | 1000 } * Optional.
Configuring flow control on an Ethernet interface
To avoid packet drops on a link, you can enable 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.
Flow control is implemented by receiving and sending Pause frames on ports. Flow control can
operate in one of the following modes on an interface:
•TxRx mode (configured by using the flow-control command)—The interface can both send
and receive flow control frames.
•Rx mode (configured by using the flow-control receive enable command)—The interface can
receive, but not send flow control frames.
As shown in Figure 2, when both Port A and Port B forward packets at the rate of 1000 Mbps, Port C
is congested. To avoid packet loss, enable flow control on Port A and Port B.
Figure 2 Flow control on ports
Configure flow control in TxRx mode on Port B and flow control in Rx mode on Port A:
•When congestion occurs on Port C, Switch B buffers frames. When the amount of buffered
frames exceeds a certain value, Switch B sends a common Pause frame out of Port B to ask
Port A to suspend sending packets. This Pause frame also tells Port A for how long it is
expected to pause.
•Upon receiving the common Pause frame from Port B, Port A suspends sending packets to Port
B for a period.
•If congestion persists, Port B keeps sending common Pause frames to Port A until the
congestion condition is removed.
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. To enable both ends of the link to
handle traffic congestion, configure the flow-control command at both ends.
To implement flow control on the local Ethernet port, you must enable flow control on both the local
Ethernet port and the remote port. If flow control is enabled on the local Ethernet port but disabled on
the remote port, forwarding of packets received on the other Ethernet ports of the local switch is
affected.
5
To enable 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
3. Enable flow control.
•Enable TxRx flow control:
flow-control
•Enable Rx flow control:
flow-control receive
enable
Use either command.
By default, Rx flow control is disabled
on an Ethernet interface.
Configuring link state change suppression on an
Ethernet interface
An Ethernet interface has two physical link states: up and down. Each time the physical link of an
interface goes up or comes down, the physical layer reports the change to the upper layers, and the
upper layers handle the change, resulting in increased overhead.
To prevent physical link flapping from affecting system performance, configure link change
suppression to delay the reporting of physical link state changes. When the delay expires, the
interface reports any detected change.
Link change suppression does not suppress administrative up or down events. When you shut down
or bring up an interface by using the shutdown or undo shutdown command, the interface reports
the event to the upper layers immediately.
Link-down event suppression enables an interface to suppress link-down events and start a delay
timer each time the physical link goes down. During this delay, the interface does not report the
link-down event, and the display interface brief or display interface command displays the
interface state as UP. If the physical link is still down when the timer expires, the interface reports the
link-down event to the upper layers.
Link-up event suppression enables an interface to suppress link-up events and start a delay timer
each time the physical link goes up. During this delay, the interface does not report the link-up event,
and the display interface brief or display interface command displays the interface state as
DOWN. If the physical link is still up when the timer expires, the interface reports the link-up event to
the upper layers.
Configuring link-down event suppression
To enable an Ethernet interface to suppress link-down events:
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 a link-down event
suppression interval. link-delay delay-time Link-down event suppression is disabled by
default.
6
Configuring link-up event suppression
To configure link-up event 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. Set a link-up event
suppression interval. link-delay delay-time mode
up
Link-up event suppression is disabled by
default.
NOTE:
The link-delay mode up command and the link-delay command supersedes each other, and
whichever is configured last takes effect.
Configuring loopback testing on an Ethernet
interface
If an Ethernet interface does not work normally, you can enable loopback testing on it to identify the
problem. Loopback testing has the following types:
•Internal loopback testing—Tests all on-chip functions related to Ethernet interfaces.
•External loopback testing—Tests hardware of Ethernet interfaces. To perform external
loopback testing on an 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 packet, the hardware of the
interface is faulty.
An Ethernet interface in a loopback test does not forward data traffic.
Configuration restrictions and guidelines
•On an interface that is physically down, you can only perform internal loopback testing. On an
interface administratively shut down, you can perform neither internal nor external loopback
testing.
•During loopback testing, the Ethernet interface operates in full duplex mode. When you disable
loopback testing, the interface returns to its duplex setting.
•Loopback testing is a one-time operation, and is not recorded in the configuration file.
Configuration procedure
To enable loopback testing 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
7
Step Command Remarks
3. Enable loopback testing. loopback { external | internal } Optional.
Disabled by default.
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. Usually, an
Ethernet interface discards jumbo frames. With jumbo frame support enabled, the interface can
process frames larger than the standard Ethernet frame size yet within the specified range.
In system view, you can configure the switch to allow jumbo frames to pass through Ethernet
interfaces.
To configure jumbo frame support:
Step Command Remarks
1. Enter system
view. system-view N/A
2. Configure jumbo
frame support. jumboframe enable By default, the switch allows jumbo frames within
2048 bytes to pass through Ethernet interfaces.
Configuring a port group
Some interfaces on your switch might use the same set of settings. To configure these interfaces in
bulk rather than one by one, you can assign them to a port group.
You create port groups manually. All settings made for a port group apply to all the member ports of
the group.
Even though the settings are made on the port group, they are saved on each interface basis rather
than on a port group basis. You can only view the settings in the view of each interface by using the
display current-configuration or display this command.
To configure a manual port group:
Step Command Remarks
1. Enter system view. system-view N/A
2. Create a manual port
group and enter manual
port group view.
port-group manual
port-group-name N/A
3. Assign Ethernet interfaces
to the manual port group. group-member
interface-list
If you use the group-member interface-type
interface-start-number to interface-type
interface-end-number command to add
multiple ports in batch to the specified port
group, make sure that the
interface-end-number argument must be
greater than the interface-start-number
argument.
8
Configuring storm suppression
In interface or port group view, you can set the maximum size of broadcast, multicast, or unknown
unicast traffic allowed to pass through an interface or each interface in a port group. 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.
The storm suppression thresholds configured for an Ethernet interface might become invalid if you
enable the storm control function for the interface. For information about the storm control function,
see "Configuring storm control on an Ethernet interface."
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 or port group view.
•Enter Ethernet interface view:
interface interface-type
interface-number
•Enter port group view:
port-group manual
port-group-name
Use either command.
To configure storm suppression
on an Ethernet interface, enter
Ethernet interface view.
To configure storm suppression
on a group of Ethernet
interfaces, enter port group
view.
3. Set the broadcast
suppression threshold
ratio.
broadcast-suppression { ratio | kbps
max-kbps }
Optional.
By default, all broadcast traffic
is allowed to pass through.
4. Set the multicast
suppression threshold
ratio.
multicast-suppression { ratio | kbps
max-kbps }
Optional.
By default, all multicast traffic is
allowed to pass through.
5. Set the unknown unicast
suppression threshold
ratio.
unicast-suppression { ratio | kbps
max-kbps }
Optional.
By default, all unknown unicast
traffic is allowed to pass
through.
NOTE:
For an Ethernet interface that belongs to a port group, if you set a traffic suppression threshold for
the interface in both Ethernet interface view and port group view, the threshold configured last takes
effect.
Setting the statistics polling interval
To set the statistics polling interval globally or 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. Set the statistics polling
interval on the Ethernet
interface. flow-interval interval
Optional.
The default interface statistics
polling interval is 300 seconds.
9
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 loopback detection on an Ethernet
interface
If a switch receives a packet that it sent, a loop has occurred to the switch. Loops might cause
broadcast storms, which degrade network performance. You can use this feature to detect whether a
loop has occurred.
Depending on whether the receiving interface is the same as the sending interface, loops include the
following types:
•Single-port loopback—A single-port loopback occurs when a switch receives a packet that it
sent and the receiving interface is the same as the sending interface, as shown in Figure 3.
•Multi-port loopback—A multi-port loopback occurs when a switch receives a packet that it
sent but the receiving interface might not be the sending interface, as shown in Figure 4.
Figure 3 Single-port loopback
Figure 4 Multi-port loopback
You can enable loopback detection to detect loops on an interface and, if the interface supports the
loopback-detection action command, configure the protective action to take on the receiving
interface when a loop is detected, for example, to shut down the interface. Depending on whether a
protective action is configured, the switch takes the actions in Table 1 to alleviate the impact of the
loop condition.
LAN
Port 1 Port 2
Loop
10
Table 1 Actions to take upon detection of a loop condition
Port type Actions
No protective action is configured A protective action is configured
Access port
•Place the receiving interface in controlled
mode. The interface does not receive or
send packets.
•Generate traps and log messages.
•Delete all MAC address entries of the
interface.
•Perform the configured protective
action.
•Generate traps and log
messages.
•Delete all MAC address entries of
the interface.
Hybrid or
trunk port
•Generate traps and log messages.
•If loopback detection control is enabled,
place the receiving interface in controlled
mode. The interface does not receive or
send packets.
•Delete all MAC address entries of the
interface.
•Generate traps and log
messages.
•If loopback detection control is
enabled, take the configured
protective action on the interface.
•Delete all MAC address entries of
the interface.
Configuration restrictions and guidelines
•To use loopback detection on an Ethernet interface, you must enable the function both globally
and on the interface.
•When you enable multi-port loopback detection on a switch, both single-port and multi-port
loops can be detected.
•To disable loopback detection on all interfaces, run the undo loopback-detection enable
command in system view.
•To enable a hybrid or trunk port to take the administratively specified protective action, you must
use the loopback-detection control enable command on the port.
•When you change the link type of an Ethernet interface by using the port link-type command,
the switch removes the protective action configured on the interface. For more information
about the port link-type command, see Layer 2—LAN Switching Command Reference.
Configuration procedure
To configure loopback detection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable global
loopback detection. loopback-detection enable Disabled by default.
3. Enable multi-port
loopback detection. loopback-detection
multi-port-mode enable
Optional.
By default, multi-port loopback detection is
disabled, and the device can only detect
single-port loopback.
4. Set the loopback
detection interval. loopback-detection
interval-time time
Optional.
30 seconds by default.
11
Step Command Remarks
5. Enter Ethernet
interface view or port
group view.
•Enter Ethernet interface
view:
interface interface-type
interface-number
•Enter port group view:
port-group manual
port-group-name
Use either command.
To configure loopback detection on one
interface, enter Ethernet interface view.
To configure loopback detection on a group
of Ethernet interfaces, enter port group
view.
6. Enable loopback
detection on the
interface. loopback-detection enable Disabled by default.
7. Enable loopback
detection control on
a trunk port or a
hybrid port.
loopback-detection control
enable Optional.
Disabled by default.
8. Enable loopback
detection in all the
VLANs on the trunk
or hybrid port.
loopback-detection per-vlan
enable
Optional.
By default, a trunk or hybrid port performs
loopback detection only in its port VLAN ID
(PVID).
9. Set the protective
action to take on the
interface when a loop
is detected.
loopback-detection action
{ no-learning |shutdown }
Optional.
By default, a looped interface does not
receive or send packets; the system
generates traps and log messages, and
deletes all MAC address entries of the
looped interface.
With the shutdown keyword specified, the
switch shuts down the looped ports and set
their physical state to Loop down. When a
looped port recovers, you must use the
undo shutdown command to restore its
forwarding capability.
Setting the MDI mode of an Ethernet interface
IMPORTANT:
Fiber ports do not support the MDI mode setting.
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 (MDI) modes:
•Across mode
•Normal mode
•Auto mode
A copper Ethernet interface uses an RJ-45 connector, which comprises eight pins, each playing a
dedicated role. For example, pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. The pin
role varies by the MDI modes as follows:
•In normal mode, pins 1 and 2 are transmit pins, and pins 3 and 6 are receive pins.
•In across mode, pins 1 and 2 are receive pins, and pins 3 and 6 are transmit pins.
•In auto mode, the interface negotiates pin roles with its peer.
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