HPE FlexFabric 12900E Series Configuration Manual page 12

LACP MAD and BFD MAD use the following process to handle a multi-active collision:
1. Compare the number of members in each fabric.
2. Set all fabrics to the Recovery state except the one that has the most members.
3. Compare the member IDs of the masters if all IRF fabrics have the same number of members.
4. Set all fabrics to the Recovery state except the one that has the lowest numbered master.
5. Shut down all service interfaces in the Recovery-state fabrics except for the following service
interfaces:
Service interfaces automatically excluded from being shut down by the system.

Service interfaces specified by using the

ARP MAD and ND MAD use the following process to handle a multi-active collision:
1. Compare the member IDs of the masters in the IRF fabrics.
2. Set all fabrics to the Recovery state except the one that has the lowest numbered master.
3. Take the same action on the service interfaces in Recovery-state fabrics as LACP MAD and
BFD MAD.
Failure recovery
To merge two split IRF fabrics, first repair the failed IRF link and remove the IRF link failure.
After the failed IRF link between two split IRF fabrics is recovered, log in to the inactive IRF fabric to
reboot its member devices if the system requires you to do so. If the IRF auto-merge feature is
enabled, the inactive IRF member devices will automatically reboot and a manual reboot is typically
not required. After these member devices join the active IRF fabric as subordinate devices, the IRF
merge is complete, as shown in
automatically restore their original state.
If you mistakenly reboot the active IRF fabric, the member devices in the IRF fabric join the inactive
IRF fabric as subordinate devices. You must use the
state of the service interfaces that have been shut down by MAD.
Figure 7 Recovering the IRF fabric
IP network
IRF fabric 1
(Active)
IP network
If the active IRF fabric fails before the IRF link is recovered (see
command on the inactive IRF fabric to recover the inactive IRF fabric. This command brings up all
service interfaces that were shut down by MAD. After the IRF link is repaired, merge the two parts
into a unified IRF fabric.
Figure 7. The service interfaces that have been shut down by MAD
IRF fabric 2
IRF fabric 1
(Recovery)
(Active)
After the IRF link
is recovered
mad exclude interface
mad restore
IP network
IRF fabric 2
(Recovery)
IRF merge
IP network
Figure
8
command.
command to restore the original
IP network
IRF
fabric
IP network
8), use the
mad restore