HP 3600 v2 Series User manual
HP 3600 v2 Switch Series
Layer 2 - LAN Switching
Configuration Guide
Part number: 5998-2350
Software version: Release 2101
Document version: 6W101-20130930
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Contents
Ethernet interface configuration ·································································································································· 1
Ethernet interface naming conventions ···························································································································1
General configuration ······················································································································································1
Configuring a combo interface·······························································································································1
Configuring basic settings of an Ethernet interface ······························································································2
Shutting down an Ethernet interface·······················································································································3
Configuring flow control on an Ethernet interface································································································3
Configuring link change suppression on an Ethernet interface···········································································4
Configuring loopback testing on an Ethernet interface························································································5
Configuring the link mode of an Ethernet interface······························································································5
Configuring jumbo frame support ··························································································································6
Enabling the auto power-down function on an Ethernet interface ······································································6
Configuring a Layer 2 Ethernet interface ·······················································································································7
Layer 2 Ethernet interface configuration task list ··································································································7
Configuring a port group ········································································································································8
Setting speed options for auto negotiation on an Ethernet interface··································································8
Configuring storm suppression ·······························································································································9
Setting the statistics polling interval····················································································································· 10
Enabling loopback detection on an Ethernet interface ····················································································· 11
Setting the MDI mode of an Ethernet interface ·································································································· 13
Enabling bridging on an Ethernet interface········································································································ 14
Testing the cable connection of an Ethernet interface······················································································· 14
Configuring storm control on an Ethernet interface··························································································· 15
Setting the MTU for a Layer 3 Ethernet interface········································································································ 16
Displaying and maintaining an Ethernet interface ····································································································· 16
Loopback and null interface configuration···············································································································18
Configuring a loopback interface ································································································································ 18
Introduction to the loopback interface················································································································· 18
Configuration procedure ······································································································································ 18
Configuring the null interface ······································································································································· 19
Introduction to the null interface··························································································································· 19
Configuration procedure ······································································································································ 19
Displaying and maintaining loopback and null interfaces························································································ 20
MAC address table configuration·····························································································································21
Overview········································································································································································· 21
How a MAC address table entry is created······································································································· 21
Types of MAC address table entries ··················································································································· 21
MAC address table-based frame forwarding ···································································································· 22
Configuring the MAC address table···························································································································· 22
Configuring static, dynamic, and blackhole MAC address table entries ······················································· 22
Disabling MAC address learning on a VLAN···································································································· 23
Configuring the aging timer for dynamic MAC address entries······································································ 23
Configuring the MAC learning limit on ports····································································································· 24
Enabling MAC address roaming························································································································· 24
Displaying and maintaining MAC address tables ····································································································· 26
MAC address table configuration example ················································································································ 26
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MAC Information configuration ································································································································28
Overview········································································································································································· 28
Introduction to MAC Information ························································································································· 28
How MAC Information works ······························································································································ 28
Configuring MAC Information······································································································································ 28
Enabling MAC Information globally ··················································································································· 28
Enabling MAC Information on an interface ······································································································· 28
Configuring MAC Information mode ·················································································································· 29
Configuring the interval for sending Syslog or trap messages········································································· 29
Configuring the MAC Information queue length································································································ 29
MAC Information configuration example···················································································································· 30
Ethernet link aggregation configuration···················································································································31
Overview········································································································································································· 31
Basic concepts ······················································································································································· 31
Aggregating links in static mode ························································································································· 34
Aggregating links in dynamic mode ··················································································································· 35
Load-sharing criteria for link aggregation groups ····························································································· 37
Ethernet link aggregation configuration task list········································································································· 37
Configuring an aggregation group ····························································································································· 38
Configuration guidelines ······································································································································ 38
Configuring a static aggregation group············································································································· 39
Configuring a dynamic aggregation group ······································································································· 40
Configuring an aggregate interface ···························································································································· 42
Configuring the description of an aggregate interface····················································································· 42
Configuring the MTU of a Layer 3 aggregate interface ··················································································· 42
Enabling link state traps for an aggregate interface ························································································· 43
Setting the minimum number of Selected ports for an aggregation group ····················································· 43
Shutting down an aggregate interface ··············································································································· 44
Restoring the default settings for an aggregate interface ················································································· 44
Configuring load sharing for link aggregation groups······························································································ 45
Configuring load-sharing criteria for link aggregation groups ········································································ 45
Enabling local-first load sharing for link aggregation······················································································· 46
Enabling link-aggregation traffic redirection··············································································································· 47
Displaying and maintaining Ethernet link aggregation ····························································································· 47
Ethernet link aggregation configuration examples····································································································· 48
Layer 2 static aggregation configuration example···························································································· 48
Layer 2 dynamic aggregation configuration example······················································································ 50
Layer 3 static aggregation configuration example···························································································· 52
Layer 3 dynamic aggregation configuration example······················································································ 54
Port isolation configuration········································································································································56
Introduction to port isolation ········································································································································· 56
Assigning a port to the isolation group ······················································································································· 56
Displaying and maintaining isolation groups ············································································································· 56
Port isolation configuration example···························································································································· 57
Spanning tree configuration······································································································································58
STP ··················································································································································································· 58
STP protocol packets ············································································································································· 58
Basic concepts in STP············································································································································ 59
Calculation process of the STP algorithm ··········································································································· 60
RSTP················································································································································································· 65
PVST················································································································································································· 66
MSTP················································································································································································ 66
STP, RSTP, and PVST limitations ·························································································································· 66
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MSTP features ························································································································································ 66
MSTP basic concepts ············································································································································ 66
How MSTP works ·················································································································································· 70
Implementation of MSTP on devices···················································································································· 71
Protocols and standards ················································································································································ 71
Spanning tree configuration task list···························································································································· 71
Configuring the spanning tree······································································································································ 76
Setting the spanning tree mode ··························································································································· 76
Configuring an MST region ································································································································· 76
Configuring the root bridge or a secondary root bridge·················································································· 77
Configuring the device priority···························································································································· 78
Configuring the maximum hops of an MST region ··························································································· 79
Configuring the network diameter of a switched network················································································ 79
Configuring spanning tree timers ························································································································ 80
Configuring the timeout factor ····························································································································· 81
Configuring the maximum port rate ···················································································································· 82
Configuring edge ports········································································································································· 82
Configuring path costs of ports···························································································································· 83
Configuring the port priority ································································································································ 85
Configuring the port link type ······························································································································ 86
Configuring the mode a port uses to recognize/send MSTP packets ····························································· 86
Enabling the output of port state transition information ···················································································· 87
Enabling the spanning tree feature ····················································································································· 87
Performing mCheck··············································································································································· 89
Configuring Digest Snooping······························································································································· 89
Configuring No Agreement Check······················································································································ 92
Configuring TC snooping ····································································································································· 94
Configuring protection functions·························································································································· 95
Displaying and maintaining the spanning tree··········································································································· 98
Spanning tree configuration examples························································································································ 99
MSTP configuration example ······························································································································· 99
PVST configuration example ······························································································································103
BPDU tunneling configuration ································································································································ 107
Introduction to BPDU tunneling ···································································································································107
Background··························································································································································107
BPDU tunneling implementation·························································································································108
Configuring BPDU tunneling ·······································································································································109
Configuration prerequisites ································································································································109
Enabling BPDU tunneling····································································································································110
Configuring destination multicast MAC address for BPDUs ···········································································110
BPDU tunneling configuration examples····················································································································111
BPDU tunneling for STP configuration example ·······························································································111
BPDU tunneling for PVST configuration example·····························································································112
VLAN configuration ················································································································································ 114
Overview·······································································································································································114
VLAN ····································································································································································114
VLAN fundamentals·············································································································································114
VLAN types ··························································································································································115
Protocols and standards ·····································································································································116
Configuring basic VLAN settings································································································································116
Configuring basic settings of a VLAN interface ·······································································································117
VLAN interface overview····································································································································117
Configuration procedure ····································································································································117
iv
VLAN interface configuration example·············································································································118
Port-based VLAN configuration ··································································································································119
Introduction to port-based VLAN ·······················································································································119
Assigning an access port to a VLAN ················································································································120
Assigning a trunk port to a VLAN······················································································································121
Assigning a hybrid port to a VLAN···················································································································122
Port-based VLAN configuration example··········································································································123
MAC-based VLAN configuration································································································································125
Introduction to MAC-based VLAN ·····················································································································125
Configuring a MAC-based VLAN······················································································································127
MAC-based VLAN configuration example ·······································································································129
Protocol-based VLAN configuration ···························································································································132
Introduction to protocol-based VLAN ················································································································132
Configuring a protocol-based VLAN·················································································································132
Protocol-based VLAN configuration example···································································································133
IP subnet-based VLAN configuration··························································································································136
Introduction ··························································································································································136
Configuring an IP subnet-based VLAN··············································································································136
IP subnet-based VLAN configuration example ·································································································137
Displaying and maintaining VLAN ····························································································································139
Super VLAN configuration······································································································································ 141
Overview·······································································································································································141
Configuring a super VLAN··········································································································································141
Displaying and maintaining super VLAN··················································································································143
Super VLAN configuration example ··························································································································143
Isolate-user-VLAN configuration ····························································································································· 146
Overview·······································································································································································146
Configuring an isolate-user-VLAN ······························································································································146
Displaying and maintaining isolate-user-VLAN·········································································································148
Isolate-user-VLAN configuration example ··················································································································149
Voice VLAN configuration······································································································································ 152
Overview·······································································································································································152
OUI addresses ·····················································································································································152
Voice VLAN assignment modes·························································································································152
Security mode and normal mode of voice VLANs···························································································154
Configuring a voice VLAN··········································································································································155
Configuration prerequisites ································································································································155
Configuring QoS priority settings for voice traffic on an interface································································156
Configuring a port to operate in automatic voice VLAN assignment mode ·················································156
Configuring a port to operate in manual voice VLAN assignment mode ·····················································157
Displaying and maintaining voice VLAN ··················································································································158
Voice VLAN configuration examples ·························································································································158
Automatic voice VLAN mode configuration example ·····················································································158
Manual voice VLAN assignment mode configuration example ·····································································160
GVRP configuration················································································································································· 163
Introduction to GVRP····················································································································································163
GARP ····································································································································································163
GVRP·····································································································································································166
Protocols and standards ·····································································································································166
GVRP configuration task list········································································································································167
Configuring GVRP functions········································································································································167
Configuring the GARP timers······································································································································168
v
Displaying and maintaining GVRP·····························································································································169
GVRP configuration examples ····································································································································169
GVRP normal registration mode configuration example·················································································169
GVRP fixed registration mode configuration example ····················································································171
GVRP forbidden registration mode configuration example············································································172
QinQ configuration················································································································································· 174
Introduction to QinQ····················································································································································174
Background and benefits····································································································································174
How QinQ works················································································································································174
QinQ frame structure ··········································································································································175
Implementations of QinQ ···································································································································176
Modifying the TPID in a VLAN tag····················································································································176
Protocols and standards ·····································································································································177
QinQ configuration task list········································································································································178
Configuring basic QinQ ·············································································································································178
Enabling basic QinQ··········································································································································178
Configuring VLAN transparent transmission ····································································································179
Configuring selective QinQ ········································································································································179
Configuring an outer VLAN tagging policy ·····································································································179
Configuring an inner-outer VLAN 802.1p priority mapping··········································································180
Configuring inner VLAN ID substitution ············································································································182
Configuring the TPID value in VLAN tags··················································································································183
QinQ configuration examples····································································································································183
Basic QinQ configuration example···················································································································183
Simple selective QinQ configuration example·································································································186
Comprehensive selective QinQ configuration example··················································································188
VLAN mapping configuration ································································································································ 193
VLAN mapping overview ············································································································································193
Application scenario of one-to-one and many-to-one VLAN mapping ··························································193
Application scenario of two-to-two VLAN mapping ························································································194
Concepts and terms ············································································································································195
VLAN mapping implementations ·······················································································································196
Configuring VLAN mapping ·······································································································································198
Configuring one-to-one VLAN mapping············································································································198
Configuring many-to-one VLAN mapping·········································································································200
Configuring two-to-two VLAN mapping············································································································203
VLAN mapping configuration examples ···················································································································206
One-to-one and many-to-one VLAN mapping configuration example···························································206
Two-to-two VLAN mapping configuration example·························································································212
LLDP configuration··················································································································································· 215
Overview·······································································································································································215
Background··························································································································································215
Basic concepts ·····················································································································································215
How LLDP works ··················································································································································219
Protocols and standards ·····································································································································220
LLDP configuration task list ··········································································································································220
Performing basic LLDP configuration··························································································································221
Enabling LLDP ······················································································································································221
Setting the LLDP operating mode ·······················································································································221
Setting the LLDP re-initialization delay···············································································································221
Enabling LLDP polling··········································································································································222
Configuring the advertisable TLVs ·····················································································································222
Configuring the management address and its encoding format····································································223
vi
Setting other LLDP parameters····························································································································224
Setting an encapsulation format for LLDPDUs···································································································224
Configuring CDP compatibility···································································································································225
Configuration prerequisites ································································································································225
Configuring CDP compatibility ··························································································································225
Configuring LLDP trapping ··········································································································································226
Displaying and maintaining LLDP·······························································································································227
LLDP configuration examples ······································································································································227
Basic LLDP configuration example·····················································································································227
CDP-compatible LLDP configuration example···································································································230
Service loopback group configuration ·················································································································· 232
Overview·······································································································································································232
Service types of service loopback groups ········································································································232
Requirements on service loopback ports···········································································································232
States of service loopback ports ························································································································232
Configuring a service loopback group······················································································································233
Displaying and maintaining service loopback groups·····························································································234
Service loopback group configuration example·······································································································234
Support and other resources ·································································································································· 236
Contacting HP ······························································································································································236
Subscription service ············································································································································236
Related information······················································································································································236
Documents····························································································································································236
Websites·······························································································································································236
Conventions ··································································································································································237
Index ········································································································································································ 239
1
Ethernet interface configuration
Ethernet interface naming conventions
The GE and 10-GE interfaces on the 3600 v2 switches are named in the format of interface-type A/B/C,
where the following definitions apply:
•A represents the ID of the switch in an IRF fabric. If the switch is not assigned to any IRF fabric, A
uses 1.
•B represents a slot number on the switch. It takes 0.
•C represents the number of an interface on a slot.
General configuration
This section describes the attributes and configurations common to Layer 2 and Layer 3 Ethernet
interfaces.
•For more information about the attributes and configuration of Layer 2 Ethernet interfaces, see
“Configuring a Layer 2 Ethernet interface.”
•For more information about the attributes and configuration of Layer 3 Ethernet interfaces, see
“Setting the MTU for a Layer 3 Ethernet interface.”
Configuring a combo interface
Introduction to combo interfaces
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:
•An 3600 v2 switch provides two combo interfaces. The fiber port and copper port of a combo
interface have the same port number. For more information about the combo interface numbers, see
the installation guide of a specific model.
•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.
2
Changing the active port of a combo interface
Follow these steps to change the active port of a combo interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter the Ethernet interface view interface interface-type
interface-number —
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:
•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 Layer 2 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.”
Follow these steps to configure an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface
view
interface interface-type
interface-number —
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.
Set the duplex mode of
the interface
duplex { auto | full |
half }
Optional
Fiber ports and combo interfaces do not support the half
keyword.
By default, the duplex mode is auto for Ethernet
interfaces.
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 1000 keywords are not applicable to
100-Mbps fiber ports.
The 10 and 100 keywords are not applicable to GE
fiber ports and copper combo port.
3
To do… Use the command…
Remarks
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, confi
g
ure the port speed with
the speed 1000 or speed auto command.
Shutting down an Ethernet interface
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.
Follow these steps to shut down an Ethernet interface or a group of Ethernet interfaces:
To do… Use the command…
Remarks
Enter system view system-view —
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.
Shut down the Ethernet
interface or interfaces shutdown Required
By default, Ethernet interfaces are up.
CAUTION:
Use this command with caution. After you manually shut down an Ethernet interface, the Ethernet interface
cannot forward packets even if it is physically connected.
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
•With the flow-control command configured, an interface can both send and receive flow control
frames: When congested, the interface sends a flow control frame to its peer. Upon receiving a flow
control frame from the peer, the interface suspends sending packets.
•With the flow-control receive enable command configured, an interface can receive, but not send
flow control frames. When the interface receives a flow control frame from its peer, it suspends
sending packets to the peer. When congested, 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. To enable both ends of the link to handle traffic
congestion, configure the flow-control command at both ends.
Follow these steps to enable flow control on an Ethernet interface:
4
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type
interface-number —
Enable flow control
•Enable TxRx flow control:
flow-control
•Enable Rx flow control:
flow-control receive enable
Required
Use either command.
By default, Rx flow control is disabled
on an Ethernet interface.
Configuring link 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
Follow these steps to enable an Ethernet interface to suppress link-down events:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type
interface-number —
Set a link-down event
suppression interval link-delay delay-time
Required
Link-down event suppression is disabled by
default.
Configuring link-up event suppression
Follow these steps to configure link-up event suppression on an Ethernet interface:
5
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type
interface-number —
Set a link-up event
suppression interval link-delay delay-time mode up
Required
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 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.
Follow these steps to enable loopback testing on an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type
interface-number —
Enable loopback testing loopback { external | internal } Optional
Disabled by default.
NOTE:
•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.
•The speed, duplex, mdi, and shutdown commands are not available during loopback testing.
•During loopback testing, the Ethernet interface operates in full duplex mode. When you disable
loopback testing, the port returns to its duplex setting.
•Loopback testing is a one-time operation, and is not recorded in the configuration file.
Configuring the link mode of an Ethernet interface
An Ethernet interface operates either in Layer 2 (bridge) or Layer 3 (route) mode. To meet networking
requirements, you can use a command to set the link mode of an Ethernet interface to bridge or route.
Follow these steps to change the link mode of an Ethernet interface:
6
To do… Use the command…
Remarks
Enter system view system-view —
Change the link
mode of Ethernet
interfaces
•In system view:
port link-mode { bridge | route } interface-list
•In Ethernet interface view:
interface interface-type interface-number
port link-mode { bridge | route }
Required
Use either approach.
CAUTION:
•After you change the link mode of an Ethernet interface, all the settings of the Ethernet interface are
restored to their defaults under the new link mode.
•The link mode configuration for an Ethernet interface in system view and in interface view supersedes
each other.
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 interface configuration mode (Ethernet interface view or port group view), you can set the length of
jumbo frames that are allowed to pass through the Ethernet interface.
•If you execute the command in Ethernet interface view, the configuration takes effect only on the
interface.
•If you execute the command in port group view, the configuration takes effect on all ports in the port
group.
Follow these steps to configure jumbo frame support in interface view or port group view:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface
view
interface interface-type
interface-number —
Configure jumbo frame
support jumboframe enable [ value ]
Required
By default, the switch allows jumbo frames within
10000 bytes to pass through Ethernet interfaces.
If you set the value argument multiple times, the
latest configuration takes effect.
Enabling the auto power-down function on an Ethernet
interface
To save power, enable the auto power-down function on Ethernet interfaces. An interface enters the
power save mode if it has not received any packet for a certain period of time (this interval depends on
7
the specifications of the chip, and is not configurable). When a packet arrives later, the interface enters
its normal state.
Follow these steps to enable auto power-down on an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface
view
interface interface-type
interface-number Required
Enable auto power-down
on an Ethernet interface port auto-power-down Required
Disabled by default.
NOTE:
W
hen you connect an interface enabled with auto power-down to a device, if the link cannot go up
properly, disable auto power-down on the interface and try again.
Configuring a Layer 2 Ethernet interface
Layer 2 Ethernet interface configuration task list
Complete these tasks to configure an Ethernet interface operating in bridge mode:
Task Remarks
Configuring a port group Optional
Applicable to Layer 2 Ethernet interfaces
Setting speed options for auto negotiation on an
Ethernet interface
Optional
Applicable to Layer 2 Ethernet interfaces
Configuring storm suppression Optional
Applicable to Layer 2 Ethernet interfaces
Setting the statistics polling interval Optional
Applicable to Layer 2 Ethernet interfaces
Enabling loopback detection on an Ethernet interface
Optional
Applicable to Layer 2 Ethernet interfaces
Setting the MDI mode of an Ethernet interface Optional
Applicable to Layer 2 Ethernet interfaces
Enabling bridging on an Ethernet interface Optional
Applicable to Layer 2 Ethernet interfaces
Testing the cable connection of an Ethernet interface Optional
Applicable to Layer 2 Ethernet interfaces
Configuring storm control on an Ethernet interface Optional
Applicable to Layer 2 Ethernet interfaces
8
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.
Follow these steps to configure a manual port group:
To do… Use the command…
Remarks
Enter system view system-view —
Create a manual port group and
enter manual port group view
port-group manual
port-group-name Required
Assign Ethernet interfaces to the
manual port group
group-member
interface-list
Required
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.
Configure jumbo frame support jumboframe enable
[ value ]
Required
By default, the switch allows jumbo frames
within 10000 bytes to pass through Ethernet
interfaces.
If you set the value argument multiple times, the
latest configuration takes effect.
Enable auto power-down port auto-power-down Required
Disabled by default.
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.
9
Figure 1 Speed auto negotiation application scenario
IP network
Server 1 Server 2 Server 3
Switch A
Eth1/0/1
Eth1/0/3
Eth1/0/4
As shown in Figure 1, all ports on Switch A are operating in speed auto negotiation mode, with the
highest speed of 1000 Mbps. If the transmission rate of each server in the server cluster is 1000 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 100 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 100 Mbps.
Follow these steps to set speed options for auto negotiation on an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type interface-number —
Set speed options for auto negotiation speed auto { 10 | 100 } * Optional
NOTE:
•This function is available only for Layer 2 copper ports that support speed auto negotiation, and is
unavailable for combo interfaces.
•The speed and speed auto commands supersede each other, and whichever is configured last takes
effect.
Configuring storm suppression
You can use the storm suppression function to limit the size of a particular type of traffic (broadcast,
multicast, or unknown unicast traffic) as a whole globally in system view or on a per-interface basis in
Ethernet interface view or port group view.
NOTE:
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.”
10
In interface or port group view, you 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.
Follow these steps to set storm suppression thresholds on one or multiple Ethernet interfaces:
To do… Use the command… Remarks
Enter system view system-view —
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.
Set the broadcast suppression
threshold ratio
broadcast-suppression { ratio |pps
max-pps | kbps max-kbps }
Optional
By default, all broadcast traffic is
allowed to pass through.
Set the multicast suppression
threshold ratio
multicast-suppression { ratio |pps
max-pps | kbps max-kbps }
Optional
By default, all multicast traffic is
allowed to pass through.
Set the unknown unicast
suppression threshold ratio
unicast-suppression { ratio |pps
max-pps | 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
Follow these steps to set the statistics polling interval globally or on an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view interface interface-type
interface-number —
Set the statistics polling interval on
the Ethernet interface flow-interval interval
Optional
The default interface 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.
11
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 fall into the
following type: single-port loopback and multi-port loopback.
•Single-port loopback occurs when an interface receives a packet that it sent out and the receiving
interface is the same as the sending interface, as shown in Figure 2.
•Multi-portloopback occurs when a switch receives a packet that it sent out but the receiving
interface might not be the sending interface, as shown in Figure 3.
Figure 2 Single-port loopback
Figure 3 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.
Table 1 Actions to take upon detection of a loop condition
Port type Actions
No
p
rotective action is confi
g
ured
A
p
rotective action is confi
g
ured
Access port
•Place the receiving interface in controlled mode.
The interface does not receive or send packets.
•Generate traps.
•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.
12
Port type Actions
No
p
rotective action is confi
g
ured
A
p
rotective action is confi
g
ured
Hybrid or
trunk port
•Generate traps.
•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.
•Create 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.
Follow these steps to configure loopback detection:
To do… Use the command…
Remarks
Enter system view system-view —
Enable global loopback
detection loopback-detection enable Required
Disabled by default.
Enable multi-port loopback
detection
loopback-detection
multi-port-mode enable
Optional
By default, multi-port loopback detection is
disabled, and the switch can only detect
single-port loopback.
Set the loopback detection
interval
loopback-detection interval-time
time
Optional
30 seconds by default.
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.
Enable loopback detection
on the interface loopback-detection enable Required
Disabled by default.
Enable loopback detection
control on a trunk port or a
hybrid port
loopback-detection control
enable
Optional
Disabled by default.
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).
Set the protective action to
take on the interface when
a loop is detected
loopback-detection action
{ no-learning |semi-block |
shutdown }
Optional
By default, a looped interface does not
receive or send packets; the system
generates traps 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.
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