[c-nsp] [j-nsp] Stange issue on 100 Gbs interconnection Juniper - Cisco

[james list]

hi
I'd like to test with LACP slow, then can see if physical interface still
flaps...

Thanks for your support

Il giorno dom 11 feb 2024 alle ore 18:02 Saku Ytti <saku at ytti.fi> ha
scritto:

> On Sun, 11 Feb 2024 at 17:52, james list <jameslist72 at gmail.com> wrote:
>
> > - why physical interface flaps in DC1 if it is related to lacp ?
>
> 16:39:35.813 Juniper reports LACP timeout (so problem started at
> 16:39:32, (was traffic passing at 32, 33, 34 seconds?))
> 16:39:36.xxx Cisco reports interface down, long after problem has
> already started
>
> Why Cisco reports physical interface down, I'm not sure. But clearly
> the problem was already happening before interface down, and first log
> entry is LACP timeout, which occurs 3s after the problem starts.
> Perhaps Juniper asserts for some reason RFI? Perhaps Cisco resets the
> physical interface once removed from LACP?
>
> > - why the same setup in DC2 do not report issues ?
>
> If this is is LACP related software issue, could be difference not
> identified. You need to gather more information, like how does ping
> look throughout this event, particularly before syslog entries. And if
> ping still works up-until syslog, you almost certainly have software
> issue with LACP inject at Cisco, or more likely LACP punt at Juniper.
>
> --
>   ++ytti
>