In my Cisco Academy class, we are doing an lab with a lot of different topics rolled into one lab. We have 2 routers set up with hsrp and has a virtual ip address. Now a 4000 switch has 4 vlans configured on it and to use isl trunking to the hsrp routers. These routers have 4 subinterfaces on the fastethernet port going to the switch (one subinterface per vlan on each router). On the 4000 switch we set up a default gateway to the hsrp virtual ip address. But on the hsrp routers when we set up the subinterfaces and enter the standby command for the virtual ip address, I thought that we use the hsrp virtual ip address but the instructor says no. She says we need to put in the vlan number as part of the virtual ip address. Example: subinterface number for vlan 20...Fa0/0.20, ip address...10.200.20.2, standby ip address...10.200.20.1. And for vlan 30 it would be 10.200.30.1 for the virtual ip address. I thought that all subinterfaces would use the same hsrp virtual ip address. I tried to find more info on the Cisco site, but could not. Is this actually correct?? Why would the virtual ip address be different for each vlan??
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