Hi, We have two 6506 switches with MSFC cards. One is HSRP active router and the other standby, and these switches are connected to each other with trunk links. When we configure dot1q on these trunk links, both routers(MSFC cards) declare themselves as HSRP active router on Vlan1, and the devices connected to different switches on Vlan1 can not communicate with each other. I didn't see any problem on other Vlan's. When we configure ISL on these switches, everything works fine. Vlan 1 is the default vlan for these swiches and the trunk ports are the members of Vlan1. Any Ideas?
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