H3C s5820x series Installation manual

H3C S5820X&S5800 Switch Series
IRF Command Reference
Hangzhou H3C Technologies Co., Ltd.
http://www.h3c.com
Software version: Release 1805P02
Release 1808P12
Document version: 6W101-20140314

Copyright © 2012-2014, Hangzhou H3C Technologies Co., Ltd. and its licensors
All rights reserved
No part of this manual may be reproduced or transmitted in any form or by any means without prior
written consent of Hangzhou H3C Technologies Co., Ltd.
Trademarks
H3C, , H3CS, H3CIE, H3CNE, Aolynk, , H3Care, , IRF, NetPilot, Netflow,
SecEngine, SecPath, SecCenter, SecBlade, Comware, ITCMM and HUASAN are trademarks of
Hangzhou H3C Technologies Co., Ltd.
All other trademarks that may be mentioned in this manual are the property of their respective owners
Notice
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute the warranty of any kind, express or implied.

Preface
The H3C S5820X&S5800 documentation set includes 12 command references, which describe the
commands and command syntax options available for the S5820X&S5800 Switch Series.
The IRF Command Reference describes IRF configuration commands for creating an IRF fabric. It covers
the commands for binding physical ports to an IRF port, configuring the member switch ID and priority,
and detecting and maintaining the IRF link.
This preface includes:
•Audience
•Added and modified commands
•Conventions
•About the H3C S5820X&S5800 documentation set
•Obtaining documentation
•Technical support
•Documentation feedback
Audience
This documentation is intended for:
•Network planners
•Field technical support and servicing engineers
•Network administrators working with the S5820X&S5800 series
Added and modified commands
This documentation set is for Release 18xx. The following describes the command changes between
releases:
•Release 1808P12 does not have command changes over Release 1805P02.
•Release 1805P02 has the following command changes over Release 1211:
Command reference Added and modified commands
IRF
Modified commands:
•irf link-delay interval: the range of the interval argument changes
to 0 to 10000 in milliseconds. The default delay for the IRF ports
to report a link down event changes to four seconds.
•mad enable: this command is available in both Layer 2 and Layer
3 aggregate interface views.

Conventions
This section describes the conventions used in this documentation set.
Command conventions
Convention Descri
p
tion
Boldface Bold text represents commands and keywords that you enter literally as shown.
Italic Italic text represents arguments that you replace with actual values.
[ ] Square brackets enclose syntax choices (keywords or arguments) that are optional.
{ x | y | ... }
Braces enclose a set of required syntax choices separated by vertical bars, from which
you select one.
[ x | y | ... ]
Square brackets enclose a set of optional syntax choices separated by vertical bars, from
which you select one or none.
{ x | y | ... } *
Asterisk marked braces enclose a set of required syntax choices separated by vertical
bars, from which you select at least one.
[ x | y | ... ] *
Asterisk marked square brackets enclose optional syntax choices separated by vertical
bars, from which you select one choice, multiple choices, or none.
&<1-n> The argument or keyword and argument combination before the ampersand (&) sign can
be entered 1 to n times.
# A line that starts with a pound (#) sign is comments.
GUI conventions
Convention Descri
p
tion
Boldface Window names, button names, field names, and menu items are in Boldface. For
example, the New User window appears; click OK.
> Multi-level menus are separated by angle brackets. For example, File > Create > Folder.
Symbols
Convention Descri
p
tion
WARNING An alert that calls attention to important information that if not understood or followed can
result in personal injury.
CAUTION An alert that calls attention to important information that if not understood or followed can
result in data loss, data corruption, or damage to hardware or software.
IMPORTANT An alert that calls attention to essential information.
NOTE An alert that contains additional or supplementary information.
TIP An alert that provides helpful information.
Network topology icons
Represents a generic network device, such as a router, switch, or firewall.

Represents a routing-capable device, such as a router or Layer 3 switch.
Represents a generic switch, such as a Layer 2 or Layer 3 switch, or a router that supports
Layer 2 forwarding and other Layer 2 features.
Represents an access controller, a unified wired-WLAN module, or the switching engine
on a unified wired-WLAN switch.
Represents an access point.
Represents a security product, such as a firewall, a UTM, or a load-balancing or security
card that is installed in a device.
Represents a security card, such as a firewall card, a load-balancing card, or a
NetStream card.
Port numbering in examples
The port numbers in this document are for illustration only and might be unavailable on your device.
About the H3C S5820X&S5800 documentation set
The H3C S5820X&S5800 documentation set includes:
Cate
g
or
y
Documents Pur
p
oses
Product description and
specifications
Marketing brochures Describe product specifications and benefits.
Technology white papers
Provide an in-depth description of software features
and technologies.
Pluggable module
description
PSR150-A & PSR150-D
Series Power Modules
User Manual
Describes the appearances, features, specifications,
installation, and removal of the pluggable 150W
power modules available for the products.
PSR300-12A &
PSR300-12D Series
Power Modules User
Manual
Describes the appearances, features, specifications,
installation, and removal of the pluggable 300W
power modules available for the products.
LSVM1AC650 &
LSVM1DC650 Power
Modules User Manual
Describes the appearances, features, specifications,
installation, and removal of the pluggable 650W
power modules available for the products.
PSR750-A [ PSR750-D ]
Power Modules User
Manual
Describes the appearances, features, specifications,
installation, and removal of the pluggable 750W
power modules available for the products.
RPS User Manual
Describes the appearances, features, and
specifications of the RPS units available for the
products.
LSW1FAN and
LSW1BFAN Installation
Manual
Describes the appearances, specifications,
installation, and removal of the pluggable fan
modules available for the products.
LSWM1FANSC and
LSWM1FANSCB
Describes the appearances, specifications,
installation, and removal of the pluggable fan


Cate
g
or
y
Documents Pur
p
oses
Installation Manual modules available for the products.
LSW148POEM Module
User Manual
Describes the appearance, features, installation,
and removal of the pluggable PoE module available
for the products.
S5820X [ S5800 ] Series
Ethernet Switches
Interface Cards User
Manual
Describes the models, hardware specifications,
installation, and removal of the interface cards
available for the products.
H3C OAP Cards User
Manual
Describes the benefits, features, hardware
specifications, installation, and removal of the OAP
cards available for the products.
H3C Low End Series
Ethernet Switches
Pluggable Modules
Manual
Describes the models, appearances, and
specifications of the pluggable modules available
for the products.
Power configuration
S5800-60C-PWR
Ethernet Switch Hot
Swappable Power
Module Ordering Guide
Guides you through ordering the hot-swappable
power modules available for the S5800-60C-PWR
switches in different cases.
RPS Ordering Information
for H3C Low-End Ethernet
Switches
Provides the RPS and switch compatibility matrix and
RPS cable specifications.
Hardware installation
•S5800 Series Ethernet
Switches Quick Start
•S5820X Series
Ethernet Switches
Quick Start
•S5800 Series Ethernet
Switches CE DOC
•S5820X Series
Ethernet Switches CE
DOC
Provides regulatory information and the safety
instructions that must be followed during installation.
•S5800 Series Ethernet
Switches Quick Start
•S5820X Series
Ethernet Switches
Quick Start
Guides you through initial installation and setup
procedures to help you quickly set up and use your
device with the minimum configuration.
•S5800 Series Ethernet
Switches Installation
Manual
•S5820X Series
Ethernet Switches
Installation Manual
Provides a complete guide to hardware installation
and hardware specifications.
Pluggable SFP[SFP+][XFP]
Transceiver Modules
Installation Guide
Guides you through installing SFP/SFP+/XFP
transceiver modules.
•S5800-60C-PWR
Switch Video
Installation Guide
Shows how to install the H3C S5800-60C-PWR and
H3C S5820X-28C Ethernet switches.

Cate
g
or
y
Documents Pur
p
oses
•S5820X-28C Switch
Video Installation
Guide
Software configuration
Configuration guide Describe software features and configuration
procedures.
Command reference Provide a quick reference to all available
commands.
Operations and
maintenance
H3C Series Ethernet
Switches Login Password
Recovery Manual
Tells how to find the lost password or recover the
password when the login password is lost.
Release notes
Provide information about the product release,
including the version history, hardware and software
compatibility matrix, version upgrade information,
technical support information, and software
upgrading.
Obtaining documentation
You can access the most up-to-date H3C product documentation on the World Wide Web
at http://www.h3c.com.
Click the links on the top navigation bar to obtain different categories of product documentation:
[Technical Support & Documents > Technical Documents]—Provides hardware installation, software
upgrading, and software feature configuration and maintenance documentation.
[Products & Solutions]—Provides information about products and technologies, as well as solutions.
[Technical Support & Documents > Software Download]—Provides the documentation released with the
software version.
Technical support
servic[email protected]
http://www.h3c.com
Documentation feedback
You can e-mail your comments about product documentation to [e-mail].
We appreciate your comments.

i
Contents
IRF configuration commands ······································································································································· 1
display irf ··································································································································································1
display irf configuration···········································································································································2
display irf topology ··················································································································································3
display irf-port load-sharing mode··························································································································4
display mad ······························································································································································6
display switchover state···········································································································································8
irf auto-update enable··············································································································································9
irf domain······························································································································································· 10
irf link-delay···························································································································································· 10
irf mac-address persistent ····································································································································· 11
irf member description·········································································································································· 12
irf member priority················································································································································· 12
irf member renumber············································································································································· 13
irf switch-to ····························································································································································· 15
irf-port ····································································································································································· 15
irf-port load-sharing mode ···································································································································· 16
irf-port-configuration active··································································································································· 17
mad arp enable····················································································································································· 18
mad bfd enable····················································································································································· 19
mad enable···························································································································································· 20
mad exclude interface ·········································································································································· 21
mad ip address······················································································································································ 22
mad restore ···························································································································································· 23
port group interface ·············································································································································· 24
Index ···········································································································································································26

1
IRF configuration commands
display irf
Use display irf to display IRF fabric information.
The information includes the member ID, role, priority, bridge MAC address, and description of each IRF
member.
Syntax
display irf [ |{ begin | exclude | include } regular-expression ]
Views
Any view
Default command level
1: Monitor level
Parameters
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Examples
# Display IRF fabric information.
<Sysname> display irf
Switch Role Priority CPU-Mac Description
1 Slave 1 000f-e2be-3102 F1Num001
*+2 Master 1 00e0-fcb1-ade2 F1Num002
--------------------------------------------------------
* indicates the device is the master.
+ indicates the device through which the user logs in.
The Bridge MAC of the IRF is: 00e0-fc00-1000
Auto upgrade : yes
Mac persistent : always
Domain ID : 30

2
Table 1 Command output
Field Descri
p
tion
Switch
IRF member ID:
•ID of the master is prefixed with an asterisk (*) sign.
•ID of the device where you have been logged in is prefixed with a plus (+) sign.
Role
Switch role in the IRF fabric:
•Slave—The switch is a subordinate device.
•Master—The switch is the master.
•SlaveWait—The switch is joining the IRF fabric as a subordinate device.
•Loading—The switch is loading the system software image.
CPU-MAC CPU MAC address of the switch.
Description
Description you have configured for the member device.
•If no description is configured, this field displays a dashed line (-----).
•If the description exceeds the maximum number of characters that can be
displayed, an ellipsis (…) is displayed in place of the exceeding text. To display
the complete description, use the display current-configuration command.
Auto upgrade
Status of the software auto-update function:
•yes—Enabled. The master switch automatically propagates its system software
image to the switch you are adding to the IRF fabric.
•no—Disabled. You must manually make sure the joining switch uses the same
system software image as the master switch. If not, the new switch cannot join the
IRF fabric.
MAC persistent
IRF bridge MAC persistence setting:
•6 min—Bridge MAC address of the IRF fabric persists for 6 minutes after the
master leaves.
•always—Bridge MAC address of the IRF fabric does not change after the master
leaves.
•no—Bridge MAC address of the new master replaces the original one as soon as
the old master leaves.
Domain ID Domain ID assigned to the IRF fabric. A domain ID uniquely identifies an IRF fabric
on a network that has multiple IRF fabrics.
display irf configuration
Use display irf configuration to display basic IRF settings on each IRF member device.
The settings include the current member ID, new member ID, priority, IRF port state, and IRF port bindings.
The new member IDs take effect at reboot.
Syntax
display irf configuration [ |{ begin | exclude | include } regular-expression ]
Views
Any view
Default command level
1: Monitor level

3
Parameters
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Examples
# Display basic IRF settings.
<Sysname> display irf configuration
MemberID NewID IRF-Port1 IRF-Port2
1 1 Ten-GigabitEthernet1/0/25 disable
2 2 disable Ten-GigabitEthernet2/0/25
Table 2 Command output
Field Descri
p
tion
MemberID Current member ID.
NewID Member ID that will take effect after a reboot.
IRF-Port1 Physical port or ports bound to IRF port 1. If no physical ports are bound to the
IRF port, this field displays disable.
IRF-Port2 Physical port or ports bound to IRF port 2. If no physical ports are bound to the
IRF port, this field displays disable.
display irf topology
Use display irf topology to display IRF fabric topology information.
The information includes the member IDs, IRF port state, and adjacencies of IRF ports.
Syntax
display irf topology [ |{ begin | exclude | include } regular-expression ]
Views
Any view
Default command level
1: Monitor level
Parameters
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.

4
Examples
# Display the IRF fabric topology.
<Sysname> display irf topology
Topology Info
-------------------------------------------------------------------------
IRF-Port1 IRF-Port2
Switch Link neighbor Link neighbor Belong To
2 DOWN -- UP 1 0023-8927-ad54
1 UP 2 DIS -- 0023-8927-ad54
Table 3 Command output
Field Descri
p
tion
Switch Member ID.
IRF-Port 1 Link state and neighbor switch of IRF port 1.
IRF-Port 2 Link state and neighbor switch of IRF port 2.
Link
Link state of the IRF port:
•UP—IRF link is up.
•DOWN—IRF link is down.
•DIS—No physical ports have been bound to the IRF port. You must use the
port group interface command to bind at least one physical port to the IRF
port.
neighbor IRF member ID of the switch connected to the IRF port.
If no device is connected to the IRF port, this field displays two hyphens (--).
Belong To IRF fabric that has the switch, represented by the CPU MAC address of the
master in the IRF fabric.
display irf-port load-sharing mode
Use display irf-port load-sharing mode to display IRF link load sharing mode.
Syntax
display irf-port load-sharing mode [ irf-port [ member-id/port-number ] ] [ |{ begin | exclude | include }
regular-expression ]
Views
Any view
Default command level
1: Monitor level
Parameters
irf-port: Displays IRF port specific load sharing modes.
member-id/port-number: Specifies an IRF port number. The member-id argument represents an IRF
member ID. The port-number argument represents the index number (1 or 2) of the IRF port on the
member device.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.

5
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Usage guidelines
To display the global load sharing mode for IRF links, execute this command without any keyword or
argument.
To display the load sharing mode used on each IRF port in the IRF fabric, specify the irf-port keyword but
not any IRF port.
To display the load sharing mode used on a specific IRF port, specify both the irf-port keyword and the
member-id/port-number argument.
Examples
# Display the global IRF link load sharing mode. In this example, because no user-defined global load
sharing mode has been configured, the default global load sharing mode applies.
<Sysname> display irf-port load-sharing mode
irf-port Load-Sharing Mode:
Layer 2 traffic: packet type-based sharing
Layer 3 traffic: packet type-based sharing
# Display the global IRF link load sharing mode. In this example, because a global sharing mode based
on source and destination IP addresses have been configured, the configured mode applies.
<Sysname> display irf-port load-sharing mode
irf-port Load-Sharing Mode:
destination-ip address, source-ip address
# Display the load sharing mode of IRF port 1/1. In this example, because neither port-specific load
sharing mode nor user-defined global load sharing mode has been configured, the default global load
sharing mode applies.
<Sysname> display irf-port load-sharing mode irf-port 1/1
irf-port1/1 Load-Sharing Mode:
Layer 2 traffic: packet type-based sharing
Layer 3 traffic: packet type-based sharing
# Display the load sharing mode used on IRF port 1/1.
<Sysname> display irf-port load-sharing mode irf-port 1/1
irf-port1/1 Load-Sharing Mode:
destination-mac address, source-mac address
# Display the load sharing mode used on each IRF port.
<Sysname> display irf-port load-sharing mode irf-port
irf-port 1/1 Load-Sharing Mode:
destination-mac address, source-mac address
irf-port 1/2 Load-Sharing Mode:
Layer 2 traffic: packet type-based sharing
Layer 3 traffic: packet type-based sharing

6
Table 4 Command output
Field Descri
p
tion
irf-port Load-Sharing Mode
Global load sharing mode for IRF links:
•If no user-defined global load sharing mode has been
configured, the default global load sharing mode applies.
•If a user-defined global load sharing mode has been
configured, the configured mode applies.
irf-port 1/1 Load-Sharing Mode
Load sharing mode for IRF-port 1/1:
•If you have not configured a port-specific load sharing mode,
the global IRF link load sharing mode applies.
•If you have configured a port-specific load sharing mode, the
configured mode applies.
Layer 2 traffic: packet type-based
sharing
Default IRF link load sharing mode for Layer 2 traffic is packet type
based.
Layer 3 traffic: packet type-based
sharing
Default IRF link load sharing mode for Layer 3 traffic is packet type
based.
destination-mac address, source-mac
address
User-configured IRF link load sharing criteria. In this sample output,
the criteria are source and destination MAC addresses.
Information displayed in this field depends on user configuration.
display mad
Use display mad to display MAD status and settings.
Syntax
display mad [ verbose ] [ |{ begin | exclude | include } regular-expression ]
Views
Any view
Default command level
1: Monitor level
Parameters
verbose: Displays detailed MAD information. If this keyword is not provided, the system displays brief
information about the MAD detection.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Examples
# Display brief MAD information.
<Sysname> display mad
MAD ARP disabled.

7
MAD LACP disabled.
MAD BFD disabled.
# Display detailed MAD information.
<Sysname> display mad verbose
Current MAD status: Detect
Excluded ports(configurable):
Vlan-interface999
Excluded ports(can not be configured):
Ten-GigabitEthernet1/0/25
MAD ARP enabled interface:
Vlan-interface2
MAD enabled aggregation port:
Bridge-Aggregation1
MAD BFD enabled interface:
Vlan-interface3
mad ip address 3.3.3.1 255.255.255.0 member 1
mad ip address 3.3.3.2 255.255.255.0 member 2
Table 5 Command output
Field Descri
p
tion
Current MAD status
MAD status:
•Detect—The IRF fabric is integrated.
•Recovery—IRF fabric is in Recovery state. When detecting a
multi-active collision, MAD places the IRF fabric with higher master ID
in Recovery state and shuts down all physical ports in the fabric but IRF
physical ports and ports that are configured to not shut down.
•Detect to Recovery—State of the IRF fabric is transitioning from Detect
to Recovery, for example, as the result of an IRF split.
•Recovery to Detect—State of the IRF fabric is transitioning from
Recovery to Detect.
Excluded ports(configurable) Ports manually configured to not shut down when the IRF fabric transitions
to the Recovery state.
Excluded ports(can not be
configured)
Ports automatically set by the system to not shut down when the IRF fabric
transitions to the Recovery state.
MAD ARP enabled interface:
Vlan-interface2 Interface where ARP MAD is enabled.
MAD enabled aggregation port:
Bridge-Aggregation1 Aggregate interface where LACP MAD is enabled.
MAD BFD enabled interface Interface where BFD MAD is enabled.
Vlan-interface3
mad ip address 192.168.2.2
255.255.0.0 member 1
mad ip address 192.168.2.3
255.255.0.0 member 2
VLAN interface used for BFD MAD, and the MAD IP address configured
for each member on this interface.

8
display switchover state
Use display switchover state to display the master/subordinate switchover states of IRF member switches.
Syntax
display switchover state [ slot member-id ] [ |{ begin | exclude | include } regular-expression ]
Views
Any view
Default command level
1: Monitor level
Parameters
slot member-id: Specifies an IRF member by its member ID. If no IRF member is specified, this command
displays the master/subordinate switchover states of the master.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Examples
# Display the master/subordinate switchover states of the master.
<Sysname> display switchover state
Master HA State to slot 2: Slave is absent.
Master HA State to slot 3: Realtime backup to slave.
Master HA State to slot 4: Waiting batch backup request from slave.
Table 6 Command output for the master
Field Descri
p
tion
Master HA State to slot slot-number
Describes the master/subordinate switchover state
between the master and a specific member. The
slot-number argument represents an IRF member ID.
Slave is absent The IRF member ID is not used in this IRF fabric.
Waiting batch backup request from slave The master switch is waiting for the batch backup
request from the subordinate switch.
Batch backup The subordinate switch is bulk-backing up data from
the master.
Realtime backup to slave The subordinate switch is backing up real-time data
from the master switch.
Data smooth The subordinate switch is transitioning to be the
master.
# Display the master/subordinate switchover state of member switch 3.
<Sysname> display switchover state slot 3

9
Slave HA State: Receiving realtime data.
Table 7 Command output for a subordinate
Field Descri
p
tion
Slave HA State Describes the master/subordinate switchover state of the subordinate switch.
Waiting The subordinate switch is ready for bulk-backing up data.
Sending batch backup
request The subordinate switch is requesting for a bulk-backup.
Receiving batch data The subordinate switch is bulk backing up data.
Receiving realtime data The member switch is receiving real-time data.
irf auto-update enable
Use irf auto-update enable to enable the software auto-update function for propagating the system
software image of the master to all its members.
Use undo irf auto-update enable to disable this function.
Syntax
irf auto-update enable
undo irf auto-update enable
Default
Software auto-update for subordinate switches is enabled.
Views
System view
Default command level
3: Manage level
Usage guidelines
When you add a switch to the IRF fabric, the software auto-update function compares the system software
versions of the switch and the IRF master. If the versions are different, the switch automatically downloads
the system software image from the master, sets the downloaded file as the system software for the next
reboot, and automatically reboots with the new system software image to re-join the IRF fabric.
To avoid an update failure, make sure the switch has efficient space for the new system software image.
If the switch you are adding to the IRF fabric is incompatible with the software version running on the
master, the software auto-update function cannot work correctly.
If software auto-update function is disabled, you must manually update the switch with the system
software image of the master.
Examples
# Enable the software auto-update function.
<Sysname> system-view
[Sysname] irf auto-update enable

10
irf domain
Use irf domain to assign a domain ID to an IRF fabric.
Use undo irf domain to restore the default IRF domain ID.
Syntax
irf domain domain-id
undo irf domain
Default
The IRF domain ID is 0.
Views
System view
Default command level
3: Manage level
Parameters
domain-id: Specifies a domain ID for the IRF fabric. The value range is 0 to 4294967295.
Usage guidelines
One IRF fabric forms one IRF domain. IRF uses IRF domain IDs to uniquely identify IRF fabrics and prevent
IRF fabrics from interfering with one another.
If one IRF fabric uses another IRF fabric as the intermediate device for ARP MAD or LACP MAD, you must
assign the two IRF fabrics different domain IDs for correct split detection. False detection causes IRF split.
Examples
# Set the IRF domain ID to 30.
<Sysname> system-view
[Sysname] irf domain 30
irf link-delay
Use irf link-delay to set the delay for the IRF ports in the IRF fabric to report a link down event.
Use undo irf link-delay to restore the default.
Syntax
irf link-delay interval
undo irf link-delay
Default
The IRF link down event report delay is 4 seconds.
Views
System view
Default command level
3: Manage level

11
Parameters
interval: Sets the IRF link down report delay in milliseconds. The value range is 0 to 10000.
Usage guidelines
An IRF link down report delay helps avoid link flapping causing frequent IRF splits and merges during a
short time.
An IRF port handles link down and link up events, as follows:
•When the IRF link changes from up to down, the port does not immediately report the change to the
IRF fabric. If the IRF link state is still down when the delay time is reached, the port reports the
change to the IRF fabric.
•When the IRF link changes from down to up, the link layer immediately reports the event to the IRF
fabric.
Examples
# Set the IRF link down report delay to 300 milliseconds.
<Sysname> system-view
[Sysname] irf link-delay 300
irf mac-address persistent
Use irf mac-address persistent to configure IRF bridge MAC persistence.
Use undo irf mac-address persistent to enable the IRF fabric to change its bridge MAC address as soon
as the master leaves.
Syntax
irf mac-address persistent { always | timer }
undo irf mac-address persistent
Default
After the master device leaves, the IRF fabric continues using its bridge MAC address as the IRF bridge
MAC address for 6 minutes. If the device does not rejoin the IRF fabric within the time limit, the IRF fabric
uses the bridge MAC address of the new master as the bridge MAC address.
Views
System view
Default command level
3: Manage level
Parameters
always: Enables the IRF bridge MAC address to be permanent. The IRF bridge MAC address does not
change after master re-election.
timer: Enables the IRF bridge MAC address to remain the same for 6 minutes after the master device
leaves. If the device rejoins the IRF fabric before the time limit is reached, the IRF bridge MAC address
does not change. If the device does not rejoin the IRF fabric within the time limit, the IRF fabric uses the
bridge MAC address of the new master as the IRF bridge MAC address.

12
Usage guidelines
By default, an IRF fabric uses the bridge MAC address of the master device as its bridge MAC address.
Layer 2 protocols, such as LACP, use this bridge MAC address to identify the IRF fabric. On a switched
LAN, the bridge MAC address must be unique.
To avoid duplicate bridge MAC addresses, an IRF fabric can change its bridge MAC address
automatically after its master leaves. However, the change causes temporary service disruption. To avoid
this situation, configure bridge MAC persistence.
If two IRF fabrics have the same bridge MAC address, they cannot be merged into one IRF fabric.
If ARP MAD is used, you must use the undo irf mac-address persistent command disable IRF bridge MAC
persistence.
Examples
# Enable the IRF bridge MAC address to persist forever.
<Sysname> system-view
[Sysname] irf mac-address persistent always
irf member description
Use irf member description to configure a description for an IRF member.
Use undo irf member description to restore the default.
Syntax
irf member member-id description text
undo irf member member-id description
Default
No description is configured for any IRF member.
Views
System view
Default command level
3: Manage level
Parameters
member-id: Specifies the ID of an IRF member.
text: Configures the IRF member description, a string of 1 to 127 characters.
Examples
# Configure a description for IRF member 1.
<Sysname> system-view
[Sysname] irf member 1 description F1Num001
irf member priority
Use irf member priority to change the priority of an IRF member.
Use undo irf member priority to restore the default.