Upgrading NXOS for C9372PX with FEX

[ali007]

Hi,

I am planning on upgrading OS for our C9372px switches they are in VPC, they have around 13 FEX connected to them and they are not dual-homed. could one of you please let me know the best method to upgrade their OS?

I don't want to upgrade all the FEXs in parallel but rather in a rolling manner. also, if you know roughly how long it can take as I will be upgrading EPLD as well.

current NXOS version is : 7.0.3.I2.3 and will be upgrading them to 9.3.7a

thank you.

Regards,

Qasim

[Sergiu.Daniluk]

Hi @ali007 

There is not much you can do when it comes to FEX upgrade. The process is pretty standard, and the FEX upgrade itself is performed automatically after the parent switch upgrade finishes (switch reloads and comes back up).

The process is like this:

Step 1	The install all command issued on the vPC primary switch triggers the installation upgrade.
Step 2	The compatibility checks display the impact of the upgrade.
Step 3	The installation proceeds or not based on the upgrade impact.
Step 4	The configuration is locked on both vPC peer switches.
Step 5	The current state is saved.
Step 6	The system unloads and runs the new image.
Step 7	The stateful restart of the system software and application occurs.
Step 8	The installer resumes with the new image.
Step 9	The FEXs are upgraded sequentially.
Step 10	The installation is complete.

After first vPC peer is upgraded, the upgrade continues on the second vpc peer:

Step 1	The install all command issued on the vPC second switch triggers the installation upgrade.
Step 2	The compatibility checks display the impact of the upgrade.
Step 3	The installation proceeds or not based on the upgrade impact.
Step 4	The current state is saved.
Step 5	The system unloads and runs the new image.
Step 6	The stateful restart of the system software and application occurs.
Step 7	The installer resumes with the new image.
Step 8	The FEXs are upgraded sequentially. The upgrade completes on the single-homed FEXs and a sanity check is performed on the dual-homed FEXs. Note  The dual-homed FEXs were upgraded by the primary switch.
Step 9	The configuration is unlocked on the primary and secondary switches.
Step 10	The installation is complete.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/fex/configuration/guide/b-cisco-nexus-2000-nx-os-fabric-extender-configuration-guide-for-nexus-9000-switches-93x/b-cisco-nexus-2000-nx-os-fabric-extender-configuration-guide-f...

Stay safe,

Sergiu