On 20 October 2011 14:00, William Cooper <wcoope...@gmail.com> wrote: > I might be confused... but wouldn't the switches learn the MAC to port > association dynamically based > on traffic flows?
In the absence of gratuitous ARP (used, for example, by VRRP), no. The switch will learn it once, cache it, and that MAC-to-port entry will remain until it times out and is relearned (unless the switch port goes down, in which case the switch will flush MACs learned on that port). This is where an earlier poster's idea of shortening the MAC aging timeout on the switch could help a little, though some folks might prefer faster failover than is afforded by MAC timeouts on a dead (yet still admin/oper UP) port. You can typically flush the MAC table manually on the switch, but that's certainly not a viable solution for speeding up automated failover. David _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
