[c-nsp] HSRP forwarding question

Shimol Shah shimshah at cisco.com
Thu Jun 17 15:37:47 EDT 2010


So what is the question ?

HSRP speakers choose a ACTIVE and a STANDBY. ACTIVE is the *only* one 
who does the forwarding.

They pick a HSRP VIP which is the DG of the users. ACTIVE one repliesto 
ARP/own's MAC for it. Users forward to ACTIVE. STANDBY is not used for 
traffic from users->network until ACTIVE is down.

GLBP has a more ACTIVE/ACTIVE implementation by choosing a AVG and 
multiple AVFs

Shimol


On 6/17/10 2:24 PM, Chris Boyd wrote:
> Having a discussion with a colleague about forwarding on HSRP.  I seem to remember seeing datagrams that were addressed to the virtual IP address, but were delivered to the standby router getting forwarded from the standby to the active for routing.
>
> It's been a while since I looked at HSRP in the lab, and I'm about to hop on a plane, so I appeal to the net.wisdom :-)
>
> Thanks,
>
> -Chris
>
>
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