I have a problem concerning a 3550-24 switch learning MAC addresses. I'm on the process of performing failover tests for a client and encountered this problem.
Below is the topology:
PIX(active) ---> 3550-24-A ---> 2621-A router
PIX(standby) ---> 3550-24-B --->2621-B router
3550-24-A ---> 3550-24-B (via cross cable)
when 3550-24-A is powered off (to simulate a defective unit), standby PIX becomes active. when 3550-24-A is powered on, a laptop connected to 3550-24-A cannot ping PIX (standby) and 2621-B but when transferred to 3550-B, can ping PIX (standby) and 2621-A but cannot ping PIX (active) and 2621-B. I found out that on 3550-A, the port connecting to 3550-B cannot learn mac-addresses from 3550-B but 3550-B port can learn mac-addresses from 3550-A. Is there a way to force a port on 3550-A to learn mac-addresses?
Well, cross check your topology for any kind of loop. Some paths could be disabled because of loops. Are the two 2621 router or the PIX connected in any way. Normally, a cisco switch will learn mac addresses. Also cross check that some mac addresses have not been assigned to any port or some other configurations on the switch.
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