There is only one virtaul MAC and IP. The operation of HSRP between active and 
active standby routers is totally transparent to the clients. In your case when 
the active router fails standby becomes active gateway but the clients have no 
idea about it, they normally forward the traffic as if the active never failed.

HTH

> Date: Tue, 25 Jan 2011 10:19:13 +0530
> From: [email protected]
> To: [email protected]
> Subject: [OSL | CCIE_RS] HSRP Query
> 
> Dear All,
> 
> I have slight confusion on working of HSRP for redundant gateway.  I have
> two access-switch/stack connected to both HSRP active and standby routers.
> All access switches are sending traffic to HSRP active gateway. But if for
> some reason HSRP state changes on Active gateway and standby becomes
> active...
> 
> How does Access switches know when HSRP gateway has changed from active to
> standby and they need to send traffic over other link.
> 
> Regards
> Nitin
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