HP 6125XLG Command Reference Manual page 14

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 before that time limit is reached,
the IRF fabric uses the bridge MAC address of the new master as the IRF bridge MAC address.
Views
System view
Predefined user roles
network-admin
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 not, the IRF fabric uses the bridge MAC address of the new master as the IRF bridge
MAC address.
Usage guidelines
IRF bridge MAC persistence specifies the amount of time an IRF fabric can continue using the old master
bridge MAC address as its bridge MAC address after a master re-election.
If ARP MAD or ND MAD is used, execute the undo irf mac-address persistent command to enable
immediate bridge MAC address change after the master leaves.
Configure the irf mac-address persistent always command in one of the following situations:
TRILL is configured.
•
• The IRF fabric uses a daisy-chained topology, and it has aggregate links with upstream or
downstream devices. The setting prevents a bridge MAC change from causing transmission delay
or packet loss at a master/subordinate switchover.
An IRF fabric by default 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.
Depending on your network condition, you can enable the IRF fabric to preserve or change its bridge
MAC address after the master leaves.
If two IRF fabrics have the same bridge MAC address, they cannot merge.
Examples
# Enable the IRF bridge MAC address to be permanent.
<Sysname> system-view
[Sysname] irf mac-address persistent always
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