What could cause "show cdp nei" to no longer work after changing from switch access to trunking and vlans? I change my network from a single vlan (router with two secondary interfaces configured) with 3 subnets - -to 3 separate vlan interfaces and trunking. I have a combination of a 6513 wan router, 3550 lan router, Catalyst 3550 & 3524XL's. Before I made the change "sho cdp nei worked". After the change to trunks and vlans, "sh cdp nei" can not see any 3524XL's when they are by themselves. If there is a 3550 upstream or downstream from a 3524 XL then, "sh cdp nei" seems to work only on that link. I believe we are running the same version of CDP on all the lan switches. Everything is working as planned except "sh cdp nei".
I have this problem too.