Hi There,
I am in the process to upgrade one mx960 with dual RE (re0 master and re1 backup).
GRES, NSR, commit sync is already configured.
Having GRES enable, make the backup RE of being ready to keep on forwarding the traffic in case of switchover/failover: logically the forwarding plane ready on backup RE.
Having NSR enables, make the backup RE of being ready to keep on routing the traffic in case of switchover/failover: control plan ready on backup RE.
With NSR and GRES enabled, we are sure that on backup RE the process like chassissd, rpd are up, running.
Now, before starting the upgrade is best practice to disable the GRES, NSR.
As soon i complete the upgarde of backup RE RE1 i need to start upgrade of master RE RE0 and GRE and NSR and commit sync are disabled in this stage of the upgrade.
As soon I swicthover the RE mastership from RE0 (still not upgraded) to RE1 (upgraded) with GRS+NSR disabled I am expecting the following situation:
- RE1 will became the new master
- The PFE will be automatically restarted and the new firmware will be loaded on to it.
- RE1 will start to communicate with the PFE
I hope i got it correctly.
Question:
- but what about the process like for example rpd/chassisd? I am expecting that without NSR+GRES enabled the backup RE RE1 has all the process down and will start them only when it will became master.
The same is valid on the contrary: as soon RE0 will became backup RE (no GRE+NSR) than the process like rpd will be killed.
Does it make sense? Is my understading correct?
Thanks.