[j-nsp] How to upgrade M20 RE's with least downtime

[Harry Reynolds]

D-oh. You also need to enable graceful routing engine switchover (GRES),
else graceful restart may not get you through the PFE reboot w/o
adjacency loss etc. Note that GRES is not compatible with some features,
a list of which is documented for the version of code you are running.

Sorry for being imprecise.


> -----Original Message-----
> From: Harry Reynolds 
> Sent: Friday, November 12, 2004 3:28 PM
> To: 'Bill Petrisko'; 'juniper-nsp at puck.nether.net'
> Subject: RE: [j-nsp] How to upgrade M20 RE's with least downtime
> 
> *If* this is within a major version, I have heard that you 
> can get great results by:
> 
> 1. Enable Graceful restart to minimize/eliminate forwarding 
> plane disruption
> 
> 2. Upgrade backup RE
> 
> 3. Manually switch (here is where graceful restart comes in)
> 
> 4. Upgrade primary RE
> 
> 5. If step 3 worked well, switch back
> 
> 
> HTHs. Please note Juniper does not claim support for hitless 
> upgrades, but this procedure has been known to result in 
> pretty much that. All bets are off if you are crossing major 
> JUNOS software revisions. You also need to enable graceful 
> restart on peer nodes for it to buy you anything.
> 
>  
> 
> > -----Original Message-----
> > From: juniper-nsp-bounces at puck.nether.net
> > [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Bill 
> > Petrisko
> > Sent: Friday, November 12, 2004 2:18 PM
> > To: juniper-nsp at puck.nether.net
> > Subject: [j-nsp] How to upgrade M20 RE's with least downtime
> > 
> > I need to upgrade the junos on an M20 with redundant RE's.
> > 
> > What is the practical method of doing this, in order to 
> have the least 
> > amount of downtime?  Are there any issues with upgrading 
> one RE at a 
> > time, and performing a manual switchover between upgrades 
> so that the 
> > router is not down for the full install process?
> > 
> > I am thinking either...
> > 
> > a) Upgrade (backup) RE1, reboot it, etc
> > b) Force switchover to RE1
> > c) Upgrade RE0
> > d) Let it run on RE1
> > 
> > Or...
> > 
> > a) Force switchover to (backup) RE1
> > b) Upgrade RE0, reboot it, etc
> > c) Force switchover to RE0
> > d) Upgrade RE1, reboot it, etc
> > 
> > I just want to make sure that one of the above is an 
> acceptable or a 
> > customary way of doing it -- also that nothing bad will happen if I 
> > have two RE's running at different version levels for a brief time.
> > 
> > bill
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> > 
>