[c-nsp] ISSU on VSS

[ryanL]

there is indeed ISSU for VSS, even with single supervisor models. i
recently upgraded from sxi2a to sxi6 with no noticeable impact if you
do it right. that said, you do lose 50% of your cluster capacity. so i
guess it depends on your interpretation/requirement for ISSU ;-)

on the flip, i can attest that sometimes ISSU doesn't work for various
reasons, with no log entries to help give a clue. sometimes it's
easier scheduling a 10-15 minute outage and just hitting the whole VSS
than it is mucking with ISSU.

On Sat, Jun 18, 2011 at 11:26 AM, scott owens <scottowens12 at gmail.com> wrote:
>>
>>   8. Re: VSS - Horror stories, show-stoppers,  other personal
>>      experience? (Tony Varriale)
>>
>
> I am pretty sure Tony that when I took the VSS class at Networkers last June
> in Las Vegas one of the benefits of the SXI4 code was that with dual sups
> ... you got ISSU.
>
> I am so sure of it because that is what we did in the class ( it was held
> the day before Networkers started ).
>
> From
> http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html
>
> Quad-supervisor uplink forwarding provides these key features:
> •eFSU upgrades— You can upgrade or downgrade your VSS system using ISSU.
> See "Upgrading a VSS"
> section<http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1169328>
> for
> more information about eFSU upgrades.
>
> scott
>
>
>> Message: 8
>> Date: Fri, 17 Jun 2011 22:32:06 -0500
>> From: Tony Varriale <tvarriale at comcast.net>
>> To: cisco-nsp at puck.nether.net
>> Subject: Re: [c-nsp] VSS - Horror stories, show-stoppers,       other
>>        personal experience?
>> Message-ID: <4DFC1C36.2020600 at comcast.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> On 6/17/2011 1:51 PM, Murphy, William wrote:
>> > 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...
>> >
>> There is no ISSU on the 6500 platform and never will be.
>>
>> tv
>>
>>
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