I have a 6500 switch, and two 2924 switches. There are two ports setup as VLAN40 in my 6500. On those two 2924 switches, I didn't configure any VLAN's on them. I assigned two different IP addresses on each 2924 interface VLAN1, and hostnames on these two 2924 switches. The IP addresses on those 2924 switches are within VLAN40. I connect these two 2924 switches on that two VLAN40 ports on 6500. They are not trunked. All these three switches are configred as VTP server with same domain name. Problem: these two 2924 switches cannot be reached at the same time. If I shut down 2924 "A", then I can ping 2924 "B", vice versa. They have different IP addresses and hostname, why I can only reach one switch at a time. Please advice. Thanks.
Make the 6500 the STP root (set spantree root). Do a show spantree on all switches to make sure all ports at both ends are forwarding and that the 6500 is seen as the root. Do a show cam to make sure they see each other. Make the 6500 the default gateway.
Also, what was the reason you didn't make them all in the same vlan?
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