Scott,

Normal HSRP rules would be in effect in this scenario
I would say (haven't done this yet). If the failed
unit had a higher HSRP priority and was configured to
preempt then when it came back online it would become
active HSRP router.

--- s vermill  wrote:
> This is very closely related to another active
> thread but thought I should
> probably start another.  I know better than to post
> on a Friday and expect
> much of an answer, but I could really use some
> insight on this one...
> 
> I recently was looking at a network about to roll
> into production.  It's a
> classic collapsed core design with redundant
> dist/core 6509s.  I noticed
> that SRM was configured on each 6509.  I also
> noticed that there was an HSRP
> instance per VLAN configured between the two
> chassis.  So, in the event of
> an MSFC failure, assuming the failed MSFC was the
> active HSRP router for a
> given VLAN or group of VLANs, I guess the other
> chassis' designated MSFC
> would start picking up outbound traffic (normal HSRP
> stuff).  In the mean
> time, the SRM process would be taking place on the
> chassis where the
> designated MSFC had failed.  At what point, if at
> all, would the outbound
> traffic shift back to the chassis with the failed
> MSFC (assuming of course
> that the non-designated MSFC had successfully come
> online)?  Is it a simple
> matter of whether or not preemt is configured?  Or,
> would the switch to the
> other chassis ever even take place?  Could it be
> that the non-designated
> MSFC would come online and immediately take over as
> the active HSRP router? 
> That seems possible too.  Maybe it comes down to how
> you set all the
> relevant timers?
> 
> I couldn't find any example on CCO where SRM and
> HSRP were used together. 
> In every case, SRM was used or HSRP was used with
> config sync.  Never both
> together.
> 
> Any thoughts?  Any experience?  It isn't an option
> at the moment to do too
> much experimenting.  Besides, I'm not sure exactly
> how I would simulate a
> true MSFC failure to see what happens.  Any thoughts
> there would also be
> appreciated.
> 
> Thanks all...
> 
> Scott


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