I have an issue when trying to migrate trunk connections off two access switches (hwbssw35a and hwbssw35b) from hwbwcata to hwbwcatc. The access switches, and presumably devices directly connected to it, can no longer can access distant networks. This is manifested by the access switches no longer prompting for a TACAC's username / password.
The issue is consistent when the access switch trunk connection is migrated from hwbwcata to hwbwcatc. When the change was backed out, all issues went away.
hwbwcatc is relatively new to the network. Ideally hwbwcata is supposed to be replaced with hwbwcatc. Unfortunately the process of moving all switch and server connections has been staged and so the whole activity has been undertaken over a period of time.
I have provided a pretty picture which shows the trunk connections. A lab was put together to simulate the environment with 3560 switches and 2800 routers as we don't have a bunch of spare 6500's laying around. I initially thought the issue was due to the use of isl and dot1q trunks but we had resolved the issue by turning off ip routing on the simulated catc but the production network didn't respond the same way the lab did :-(
I have also attached the 'show tech' output of the three core switches and two access switches.
Your help and advice is appreciated.