Re: OOT: VSS experience

The process is much easier with dual sup's in each chassis. Marc was mentioning he had only one per chassis.

Sent from handheld

On Apr 13, 2012, at 12:17 PM, "Alexander Lim" <cisco.alexand_at_gmail.com> wrote:

> Hi Marc,
>
> Thank you for the replies.
> Have you tried eFSU (enhanced FSU)?
> I just watched this video https://supportforums.cisco.com/videos/2650 about
> eFSU upgrade on VSS with Quad Supervisor.
> It seems awesome, only 5 ping packets were lost during the upgrade.
>
> Regards,
> Alex
>
> On Fri, Apr 13, 2012 at 12:49 PM, marc edwards <renorider_at_gmail.com> wrote:
>
>> Even being more defined. I remember that since the break also happens to
>> the erthchannel that the heartbeat/keepalives live on, it breaks the
>> chassis from being seen as one. This can cause path selection and ports at
>> best get disabled or at worst get err-disabled needing physical bounce.
>>
>> 1000v seemed to have some ehter channel-issues once back up as well. I
>> could go on about that long maintnance. Longer than most. I aslo replaced a
>> 4500 chassis from R R-E by unscrewing everything, and pulling modules out
>> but keeping cabling existing, then screwing chassis in contortion style. My
>> back hurt for a few days.
>>
>> It was a rough few days at work... But perhaps the process will get
>> easier. We go with one sup per chassis and maybe dual sups simplifies it a
>> bit. Food for thought.
>>
>> Aside from that, we have minimal issues setting up virtual port channels
>> and I am satisfied with the technologies ability to simplify design issues.
>>
>> HTH
>>
>> Marc
>>
>>
>> On Thu, Apr 12, 2012 at 8:07 PM, marc edwards <renorider_at_gmail.com> wrote:
>>
>>> I guess I should elaborate with some information that brings me to that
>>> feeling.
>>>
>>> Performing a Fast Software Upgrade of a VSS
>>>
>>> The FSU of a VSS is similar to the RPR-based standalone chassis FSU
>>> described in the "Performing a Fast Software Upgrade" section<http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/redund.html#wpxref62923>.
>>> While the standalone chassis upgrade is initiated by reloading the VSS
>>> standby supervisor engine, the VSS upgrade is initiated by reloading the
>>> VSS standby chassis. During the FSU procedure, a software version
>>> mismatch between the VSS active and the VSS standby chassis causes the
>>> system to boot in RPR redundancy mode, which is stateless and causes a hard
>>> reset of the all modules. As a result, the FSU procedure requires system
>>> downtime corresponding to the RPR switchover time.
>>>
>>> This can break the vPC's (not sure if they have same name as Nexus)
>>> and cause some spanning-tree fun if not careful as well. It does need mtnc.
>>> window. Don't forget, this will most likely be distribution/core device
>>> touching almost everything in the campus. Speaking from bloody experience
>>> on that one.
>>>
>>> Regards,
>>>
>>> Marc
>>>
>>> On Thu, Apr 12, 2012 at 6:57 PM, Alexander Halim <cisco.alexand_at_gmail.com
>>>> wrote:
>>>
>>>> Hi Marc,
>>>>
>>>> Does it mean that VSS requires downtime when doing IOS upgrade? I
>>>> thought it supports eFSU which is a kind of ISSU? Or you are referring to
>>>> the complexity of eFSU procedure?
>>>>
>>>> Thank you for sharing.
>>>>
>>>> Regards,
>>>> Alex
>>>>
>>>> On Apr 12, 2012, at 11:58 PM, marc edwards <renorider_at_gmail.com> wrote:
>>>>
>>>> It is great... but a bitch to update IOS. At least that is my experience
>>>> with it.
>>>>
>>>> On Thu, Apr 12, 2012 at 8:42 AM, Alexander Lim <<cisco.alexand_at_gmail.com>
>>>> cisco.alexand_at_gmail.com> wrote:
>>>>
>>>>> Guys,
>>>>>
>>>>> Sorry for non-technical question.
>>>>> But may I ask you if you have any bad experience deploying/using VSS?
>>>>> Is it
>>>>> quite stable?
>>>>> Would you recommend using VSS in production network?
>>>>>
>>>>> Thanks
>>>>>
>>>>> Regards,
>>>>> Alex
>>>>>
>>>>>
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Received on Fri Apr 13 2012 - 16:21:51 ART