7
Collision handling
When multiple identical active IRF fabrics are detected, MAD compares the member IDs of their
masters. If the master in one IRF fabric has the lowest member ID among all the masters, the
members in the fabric continue to operate in Active state and forward traffic. MAD sets all the other
IRF fabrics in Recovery (disabled) state and shuts down all their physical ports but the console ports,
physical IRF ports, and any ports you have specified with the
mad exclude interface
command.
Failure recovery
To merge two split IRF fabrics, first repair the failed IRF link and remove the IRF link failure.
If the IRF fabric in Recovery state fails before the failure is recovered, repair the failed IRF fabric and
the failed IRF link.
If the IRF fabric in Active state fails before the failure is recovered, first enable the IRF fabric in
Recovery state to take over the active IRF fabric and protect the services from being affected. After
that, recover the MAD failure.
LACP MAD
LACP MAD requires that every IRF member have a link with an intermediate device, and all these
links form a dynamic link aggregation group, as shown in
. In addition, the intermediate
device must be an HPE device that supports extended LACP for MAD.
The IRF member switches send extended LACPDUs with TLVs that convey the domain ID and the
active ID of the IRF fabric. The intermediate device transparently forwards the extended LACPDUs
received from one member switch to all the other member switches:
•
If the domain IDs and the active IDs in the extended LACPDUs sent by all the member devices
are the same, the IRF fabric is integrated.
•
If the extended LACPDUs convey the same domain ID but different active IDs, a split has
occurred. To handle this situation, LACP MAD sets the IRF fabric with higher active ID in
Recovery state, and shuts down all its physical ports but the console port, IRF ports, and any
ports you have specified with the
mad exclude interface
command. The IRF fabric with lower
active ID is still in Active state and forwards traffic.
