I have several 2960/2640 switches with "ip default-gateway" configured. However, the IP of the default gateway recently changed, and the old gateway IP is no longer active. But these 2960's still try to send *some* outbound traffic using the old gateway IP, even though I have changed the default gateway to the new IP. I have tried deleted and re-adding, and also just deleting it, thinking that proxy arp can figure it out, but nothing works. A reboot does fix it, just wondering if there is some way to do it without rebooting the switches. Any ideas from anyone?
I said *some* outbound traffic, because it can reach other hosts, even on the same destination subnet as the failed destination host. But when I try to reach that particular host, the switch tried to use the old gateway IP. I can tell this because I used debug arp to see what it was doing. Very strange.