[j-nsp] How to upgrade M20 RE's with least downtime
harry at juniper.net
Fri Nov 12 19:08:36 EST 2004
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
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
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