Colleagues, I have several pairs of Catalyst 3560E switches connected via third party MUXes (Avara ENT100). When the actual physical medium goes down, the MUXes do not shutdown their Ethernet interfaces (i.e. they have no "link poisoning"). So I need some sort of point-to-point L2 link fault management between the switches.
Is UDLD suitable for this purpose? I have experimented a bit with "udld port aggressive" and have found out the following strange thing. When the physical link goes down, UDLD detects this condition and shuts the switch interface down. However, after several minutes, the interface goes up again with "%PM-4-ERR_RECOVER: Attempting to recover from udld err-disable state on Gi0/17". The interface is up even though "Current bidirectional state: Unknown", and seems to be in the STP forwarding state. This does not look good. If a broadcast frame arrives to this port before a BPDU does, there will be a storm and a lot of MAC flapping. Is there a way to keep the port from forwarding traffic until the UDLD state is Bidirectional ? Thanks a lot for any input. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN sip:[email protected] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
