From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Thu Oct 27 2005 - 12:07:00 GMT-3
Hi,
I'm back again with this topic, "HSRP backtraffic howto" so to say.
While reading (again) the campus network design paper, I see that you
can use HSRP to have default GW for ASWs (Access switches) to reach the
world in case of DSW (Distribution switch) failure.
So basically ASWs do have dedicated IP subnets (usually two for load
balancing) and then is a DSW goes down, the remaining DSW (they go in
pairs) takes the whole traffic.
Great.
But what happens if a ASW - DSW link goes down ?
HSRP still works because DSWs are linked by the failing link, so both
pretend to be active (isolated I guess) and the one talking to the ASW
does the job. But what about the traffic going to the ASW ? Both DSW are
layer 3 active on that IP subnet, and unless there is hardware
indication of the link down at the switch, traffic will be half dropped.
Am I missing something ?
Regards,
-- Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
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