| It's in the BL2.2 release notes as "delayed datalink enable", and
the reasons for it are discussed elsewhere in this notes conference,
most likely under the failover-configurations or dual-homing-failover
keywords.
The basic idea is that it allows a customer to control when the
"failback" of an M port occurs.
With normal dual homing, the B->A failover occurs fairly quickly,
but after the B path is restored, the A->B transition may encounter a
long outage. By using this feature on the M port connected to the B
port, the network manager can prevent the A "failback" from happening
automatically.
The "bad" scenario happens when the linecard connected to the B
port reboots. The FDDI port is ready before the bridge port is ready,
so failback happens, but no traffic can take place until the bridge
port initialization completes.
MDL
|