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 address owner leaves.
Syntax
irf mac-address persistent { always | timer }
undo irf mac-address persistent
Default
The IRF bridge MAC address remains unchanged for 6 minutes after the address owner leaves.
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 the address owner leaves.
timer: Enables the IRF bridge MAC address to remain unchanged for 6 minutes after the address owner leaves. If the address owner rejoins the IRF fabric within the time limit, the IRF bridge MAC address does not change. If the address owner does not rejoin within the time limit, the IRF fabric uses the bridge MAC address of the current master as the bridge MAC address.
Usage guidelines
IRF bridge MAC persistence specifies the amount of time an IRF fabric can continue using a bridge MAC address as its bridge MAC address after the address owner leaves.
If ARP MAD or ND MAD is used with the spanning tree feature, disable IRF bridge MAC persistence by using the undo irf mac-address persistent command.
Use the irf mac-address persistent always command when the following conditions are met:
The IRF fabric uses a daisy-chain topology.
The IRF fabric has aggregate links with upstream or downstream devices.
The persistence setting prevents transmission delay or packet loss after the address owner leaves.
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 the address owner leaves. However, the change causes temporary service disruption. Depending on the network condition, you can enable the IRF fabric to retain or change its bridge MAC address after the address owner leaves.
When IRF fabrics merge, IRF ignores the IRF bridge MAC address and checks the bridge MAC address of each member device in the IRF fabrics. IRF merge fails if any two member devices have the same bridge MAC address.
Examples
# Enable the IRF bridge MAC address to persist forever.
<Sysname> system-view [Sysname] irf mac-address persistent always