[c-nsp] ISSU on nexus 5k with vPC/lacp

Xavier Nicollet xnicollet at gmail.com
Mon Mar 28 12:04:55 EDT 2016

Our upgrade did not go very well: there was no ISSU, because of the LACP,
we had some spanning tree issue on one port that made some VM in the blue
for quite some time.

We also  hit a bug in ntpd that ate the whole disk doing core dumps. Worked
with TAC support to fix everything.

Hope it might help other people considering upgrading.

So in short: upgrade WAS a bit disruptive, but we survived.

On Fri, Feb 19, 2016 at 12:15 AM, Xavier Nicollet <xnicollet at gmail.com>

> Hi,
> we are about to upgrade a couple of nexus 5k switches, with fabric
> extenders, plain simple ethernet connections and also most servers double
> attached with a lacp port.
> I am not sure how lacp will react: we haven't put our servers in "slow
> mode".
> According to cisco documentation:
>   ``Note that a Fast LACP timers (hello=1 sec, dead=3 sec) are not
> supported with a nondisruptive ISSU.''
> According to this post:
> http://www.networking-forum.com/viewtopic.php?f=33&p=272430 upgrading
> should be seemless.
> What will happen during the ISSU upgrade on dual attached servers? (vpc)
> What will happen on simple ethernet interfaces?
> Can anyone share about his experience upgrading NX-OS?
> Many thanks,
> --
> Xavier Nicollet

Xavier Nicollet

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