HP FlexFabric 5700 series Configuration Manual page 25

To avoid duplicate bridge MAC addresses, an IRF fabric can change its bridge MAC address
automatically after its bridge MAC owner leaves. However, the change causes temporary traffic
disruption.
Depending on the network condition, enable the IRF fabric to preserve or change its bridge MAC
address after the address owner leaves. Available options include:
irf mac-address persistent timer—Bridge MAC address of the IRF fabric remains unchanged for 6
•
minutes after the address owner leaves. If the owner does not return before the timer expires, the IRF
fabric uses the bridge MAC address of the current master as its bridge MAC address. This option
avoids unnecessary bridge MAC address changes caused by device reboot, transient link failure,
or purposeful link disconnection.
• irf mac-address persistent always—Bridge MAC address of the IRF fabric does not change after
the address owner leaves.
NOTE:
IRF fabrics that have the same bridge MAC address cannot merge. If you use the removed bridge
MAC owner as the master device in a new fabric, the bridge MAC of the new fabric is the same as the
old fabric. For the two IRF fabrics to merge, you must change the bridge MAC address of the old IRF
fabric.
undo irf mac-address persistent—Bridge MAC address of the current master replaces the original
•
one as soon as the owner of the original bridge MAC leaves.
When you configure IRF bridge MAC persistence, follow these guidelines:
If ARP MAD or ND MAD is used, configure the undo irf mac-address persistent command to
•
enable immediate bridge MAC address change after the address owner leaves.
• Configure the irf mac-address persistent always command in the following situations:
TRILL is configured. The persistence setting ensures that other devices in the TRILL network can
maintain correct network topology after the address owner leaves.
The IRF fabric uses a daisy-chain topology, and it has aggregate links with upstream or
downstream devices. The persistence setting prevents transmission delay or packet loss after the
address owner leaves.
To configure the IRF bridge MAC persistence setting:
Step
1. Enter system view.
2. Configure IRF bridge MAC
persistence.
Command
system-view
•
Retain the bridge MAC address
permanently even if the owner has
left the IRF fabric:
irf mac-address persistent always
•
Retain the bridge MAC address for
6 minutes after the owner leaves
the fabric:
irf mac-address persistent timer
•
Change the bridge MAC address
as soon as the owner leaves the
fabric:
undo irf mac-address persistent
21
Remarks
N/A
By default, the IRF bridge MAC
address remains unchanged for
6 minutes after the address
owner leaves the fabric.