[j-nsp] VRRP flap between CRS-1 and junos 8.5 M40

[alain.briant at bt.com]

Sorry for those stupid questions ...

But the third one is still the right one :
 
You are not saying if the flap is when the reboot at the end of the upgrade is done or if the flap occurs during the upgrade.

- Does the flapping occurs during the reboot or before ?

In fact I have seen with other protocols handled by the routing engine that during some CPU consuming job like the software installation, some other cpu consuming protocols that need to send frames quite fast, like VRRP (in my case it was BFD) I had the process that had to send those frames that was "stuck" for some little period when the unpacking software process or validating software process occurs.

I was able to reproduce the problem simply by doing a false upgrade using the command:
"Request system software validate xx"

I think you could use the same command to reproduce your problem.
Like it has been advised you could then try to raise your VRRP timer up to 500ms or more (perhaps 1 second)
You will need to do it on both sides (CRS1 and M40)

Hope this will help
Regards

Alain


-----Message d'origine-----
De : Nicolaj Kamensek [mailto:nk at accelerated.de] 
Envoyé : mardi 8 avril 2008 23:01
À : Briant,A,Alain,JPECS R
Cc : rupesh at rilinfo.net; juniper-nsp at puck.nether.net
Objet : Re: [j-nsp] VRRP flap between CRS-1 and junos 8.5 M40

alain.briant at bt.com schrieb:

> May I advise you something:
> You are not saying if the flap is when the reboot at the end of the upgrade is done or if the flap occurs during the upgrade.
> - So does you M40 have a redundant routing engine or not ?
> - Are you doing the upgrade on the passive routing engine ?

the M40 does not support redundant Routing Engines.

Regards


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