[c-nsp] HSRP and removing connected route

Phil Mayers p.mayers at imperial.ac.uk
Thu Dec 8 17:30:57 EST 2011

On 12/08/2011 08:23 PM, Jay Nakamura wrote:
> So, the situation is this.
> Let's say I have a topology where there are two routers, each router
> connected to separate switches, and the two switches are connected to
> a gigabit ethernet WAN.
> One router and switch is in one city, other router and switch is in
> another city.
> There is a VLAN that spans the two routers, two switches and servers
> hosted in one city.
> I have the VLAN on HSRP between the two routers.
> The problem is this.  When the gigabit WAN goes down, the one end of
> the router without the host will still try to route that traffic out
> it's VLAN.  Is there a way to prevent that by using IP SLA or track
> command or some other trick?  Perhaps shutdown the subinterface auto
> magically?  (Although, if it shuts it down, I am not sure how it will
> detect that the service is back up)
> Or is there something I am not thinking of I should be doing other than HSRP?

This is such an odd setup, I feel sure there is more to it than described.

Question: why are you using HSRP at all? Why not just route from city 1 
to city 2?

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