[c-nsp] VSS - Horror stories, show-stoppers, other personal experience?

[Murphy, William]

We are running VSS for distribution layer switching in a campus environment
and have been quite pleased with it...  Benefits for us are simplification,
faster convergence and better performance (distribution of traffic)...  No
more STP blocking ports, MCE to access-layer so both links are utilized,
faster convergence, no need for HSRP, also our two 10G uplinks are
equal-cost even though they are connected to separate chassis...  It's
worked quite well except for ISSU...  We have attempted using ISSU to do
hitless IOS upgrades with maybe 20% success rate...

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mike G
Sent: Thursday, June 16, 2011 10:54 PM
To: Andrew Miehs
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] VSS - Horror stories, show-stoppers, other personal
experience?

Thank you again Andrew, I appreciate the info!

Has anyone else run into problems?  Have you heard of others having
problems?

Or, have you had a really successful VSS implementation and have no
complaints?

I would love to hear some more opinions on VSS.

-MikeG


On Thu, Jun 16, 2011 at 5:25 PM, Andrew Miehs <andrew at 2sheds.de> wrote:

> On Friday, June 17, 2011, Mike G <geezyx at gmail.com> wrote:
> > Thanks for the great feedback Andrew!  Did you ever discover the 
> > cause of
> the crash?  Also, was the 20 second outage due to the delay in the 
> active-hot sup taking over or was it something else?
>
> Iirc - the crash logs reported a cache corruption, and the 20 seconds 
> were spanning tree settling down - will ask my colleague in 2 weeks 
> when he gets back from holidays. Dont forget however - we are running 
> an old release on these boxes - ?sxi6/ sxj is current?  - and it only 
> happened after more than 1 year uptime. Not being an ISP means we can 
> get away with running older software longer.
>
> We did open a tac case but unfortunately were not in a position to 
> replicate the problem.
>
> Andrew
>
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