Catalyst 9500 high-performance SVL separate upgrade
We have 9500 high-performance model (c9500-48y4c) with SVL configured and need to upgrade from 16.09.04 to 16.12.04.
Per checking the document, high-performance models are not supporting ISSU method in current release of 16.09 yet so we need to do it with traditional upgrade and going to need downtime.
Restrictions and Guidelines for Performing ISSU
- On Cisco Catalyst 9500 Series Switches - High Performance, ISSU with Cisco StackWise Virtual is supported starting from Cisco IOS XE Gibraltar 16.12.1. Therefore, ISSU upgrades can be performed only starting from this release to a later release.
My challenge here is to minimize the downtime needed for upgrade during reload both switches. So I'm looking for a solution if I can separate both switches from SVL domain and upgrade them separately. My steps are like below. It can minimize downtime needed for upgrade from ~30mins to only ~5-10mins with some wiring needed.
unconfigure SVL dual-active-detection, this is to allow a split-brain scenario and not putting one of them into recovery mode
remove all downstream cables from standby switch - traffic will forwarded via active ones
remove dual-active port and VSL ports
at this step, the standby switch will be split-brain and separated from SVL
we can do software upgrade on the standby switch while traffics still operational via active switches
after completing upgrade on standby, do install commit version and perform software upgrade on active switch
during the active switch reload, plug all downstream cables into standby switch - traffic interruptions will restored
at this point, I'm not sure the active one will need to remove all downstream cable and VSL ports or not - to let it split-brain and able to commit version before joining SVL
If it's not need to remove downstream cables, We might insert VSL ports back and let them negotiate SVL domain while it's booting
Join SVL and commit version on active switch, the upgrade is complete on both switches.
configure back SVL dual-active-detection ports, insert dual-active link port
In the document, while implementing Stackwise Virtual, after configuring SVL link it has mentioned about configuring dual-active-detection links and it's not saying this is optional steps so I wonder if this is required configuration for stackwise to work properly or it's just a mechanism to avoid split-brain scenario.
I'm been completing above steps for Cat6800 VSS once, but not sure if this method would be possible for C9500 Stackwise Virtual or not. So I need you guys to help checking steps and debate if there's any other better method.
Also in step 5.1/5.2, not sure if which one would be better for completing upgrade on Active switch?
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