ISSU in a C9407R

[RICHARD MESSINGER]

Looking at a configuration for a Customer who is concerned about network disruption in their core.

with a C9407R with Dual SUPs and not using any of the interface ports on the Sups, Can I truly upgrade one Sup and then the other without disrupting any of the traffic in the Core?

Looking for real world feedback.

Thank you.

[marce1000]

   - That's determined by a number of factors; such as the target release and the release being upgraded from; always check the Release Notes for the target version and look for related notes (if the jump from the previous version is too big then that may not be  possible) ; then look for similar document for target release as in https://www.cisco.com/c/en/us/support/docs/ip/trivial-file-transfer-protocol-tftp/212470-catalyst-9400-upgrading-dual-supervisor.html
                                  Read carefully!

   M.

  M.

[RICHARD MESSINGER]

Thank you for the response.  Reading through the document, it states that you only upgrade the running Supervisor and the Second Supervisor is not inserted.  That would lead me to say that the upgrade is not non-stop.  That there is a significant outage when the Sup reboots and then you remove the upgraded Sup and Inert the Second Sup and do the upgrade.  There would be two periods then the switch is not passing any traffic and the network is down.

Am I reading that correctly?

[RICHARD MESSINGER]

Or maybe that was the way with older 16.x versions.  Reading the 17.12 release notes, that is not the case.

Always read the release notes.

[balaji.bandi]

Dual supervisor in the same chassis ?

what IOS XE running, what is your target version ?

Hope this is not part of SVL ?

follow below thread :

https://community.cisco.com/t5/switching/9407r-dual-supervisors-upgrade/td-p/4503236

[RICHARD MESSINGER]

So this will be a new install with Dual Sups.  With that said, the Sups should have a recent 17.x version.  If not, we would upgrade to the latest version before it is deployed.as a single Core switch.

Thank you

[Leo Laohoo]

ISSU, FSU/eFSU/xFSU is not a one-size-fits-all.  Not all deployment works 100%.  If it works, great.  However, if it does not work, someone needs to be at the site to pull the plug, literally, because we've found out the hard way that the only way to gain back control of the network is to power down one of the two units.  

Another thing:  ISSU, FSU/eFSU/xFSU does not support ROMMON or FPGA upgrade.  ISSU, FSU/eFSU/xFSU also does not support non-Hitless SMU installation.

Always have a Proactive TAC Case before the ISSU, FSU/eFSU/xFSU upgrade begins.  Make sure a TAC Engineer (not a TAC Agent) has a WebEx session and is ready to intervene if-and-when the upgrade goes south.