The routing table of E3 shows the two routes to the 10.90.153.0/24 network,
via 172.23.31.53 and 172.23.31.24.
When I disconnect the link between THCC_1 and Test_1, the routing table on
E3 updates to show just the one route via
172.23.30.24, but I lose the ability to ping or traceroute from E3 to Test_1.
Test_2 pings and traces fine.
Is this a routing or spanning tree issue?
(or maybe there's a better way to do this redundancy?)
My diagram attached. All devices are 3560's.
Thanks much, Ric