[c-nsp] Adding a second switch for redundancy

[Bruce Pinsky]

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Eric Kagan wrote:
> I am trying to lab the following - Several routers plugged in to two
> seperate switches for redundancy.  Catalyst 3524XL/3550.  7200/7500 routers
> - 
> 
> 
> Design A (works fine - diagram below)
> 
> 5 routers plugged in to a 3550 (configured as Layer 2 ports).  We are
> running EIGRP on the routers.
> 
> 
> 
> Design B (EIGRP Errors - diagram below)
> 
> We added 2nd FE cards to the routers
> We plugged them in to the new switch
> We assigned a new / separate subnet for the interfaces. 
> 
> When we bring them up, we get EIGRP flaps. (log clip below)
> Are there EIGRP settings that need to be changed for having 2 FE's from the
> same routers in different switches ?  Do the switches need to be trunked ? 
> 
> Thanks
> Eric
> 
> 
> 
> Design A: (working - single switch, multiple routers)
> 
> 
> -----------------
> |  Cat 3550-A   |
> -----------------
>   |   |   |   | ----- 1.1.1.0 /24 (EIGRP)
>   R   R   R   R
> 
> 
> Design B: (problem)
> 
> 
> -----------------
> |  Cat 3550-A   |
> -----------------
>   |   |   |   | ----- 1.1.1.0 /24 (EIGRP)
>   R   R   R   R
>   |   |   |   | ----- 2.1.1.0 /24 (EIGRP)
> -----------------
> |  Cat 3550-B   |
> -----------------
> 

Well, assuming that 3550-A and 3550-B are not connected in any way, I
wouldn't think there would be any problem.

Is there more info here than is implied in simple ASCII art?  Config
snippet would be helpful...

- --
=========
bep

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