Dennis,
Just a little different perspective below...
dennis cherry wrote:
>
> The way we have it is 2 routers connected to the 4000 switch
> with 4 vlans on the switch. Have set up 4 subinterfaces on each
> router, 1 for each van. Each with a separate ip address
> corresponding to the vlan number. We have 2 HSRP groups set up
> with 2 vlans in each group.
That's one way of looking at it. But it might help to keep things clear in
your mind if you consider that there really are four HSRP groups. You're
simply using each group number (and, as has been pointed out, the same
virtual MAC) twice.
> 1 router will be the active for 1
> group (2 of the vlans) and the other router will be the active
> for the other group (2 vlans). On each subinterface for each
> router for each vlan, it has a unique virtual HSRP IP address.
> I originally thought that all would use the same virtual HSRP
> IP address.
Did you mean that all VLANs in a group would use the same virtual address?
If so, you really need to consider looking at things the way I described
above. Think about it. One VLAN per subnet, right? (yes you can have more
than one subnet per VLAN but you can't have more than one VLAN per subnet)
So how would a host in VLAN 10 use the virtual IP of VLAN 12 as a gateway
(or vice versa)? Even if the VLANs/subnets are in the "same group," they're
still in different networks. How could a host with ip address 10.1.1.50/24
use a virtual IP of 10.1.2.1/24 as a gateway? The host would need a gateway
to reach the gateway since they're in different layer 3 networks.
> You are saying that there should be 4 groups (1 for
> each vlan) instead of the 2 groups that we have?? Or is it OK
> with 2 groups and the 4 unique virtual HSRP IP addresses on
> each router??
It's OK. But to the extent possible, at least in a real network, I'd think
you would want to have a 1:1 ratio between HSRP groups and VLANs.
>
> This type of setup wasn't covered together in our class, just
> vlans and HSRP seperately. But in this lab we have Vlans
> running thru HSRP router doing ISL trunking and the routers are
> also running BGP and EIGRP to connect to a remote router. AHHH!
>
> Thanks for your help.
Regards,
Scott
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