Up-grade IOS for 4500x with stack

[Srinivas N]

Hi Friends,

Please help me out to upgrade IOS for Cisco 4500 X, which is on stack,

Is it required to upgrade primary and secondary or just like normal switch, please help me with steps.

[Leo Laohoo]

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@Srinivas N wrote:

Please help me out to upgrade IOS for Cisco 4500 X, which is on stack,

Is it required to upgrade primary and secondary or just like normal switch, please help me with steps. 

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Please read the Release Notes.  

Release Notes will provide details on how to perform the upgrade in VSS. 

Also, depending on the version of firmware, they are cases where a ROMmon upgrade is mandatory.

[Reza Sharifi]

Hi,

So, the first thing you have to decide is what version you want to upgrade to and why? 

Once you make that decision, as Leo said, you need to read the release notes very carefully before upgrading. If they are configured in VSS, the fastest option is to load the new IOS in both primary and backup, set your boot variable and reload both chassis. Note that this option requires a maintenance window as it will cause downtime. 

HTH

[floresmichael]

Please refer steps below for an upgrade procedure.

Step 1:  Copy the IOS Image from tftp server to bootflash and slavebootflash.

#copy tftp:<new-IOS Image> bootflash:<new-IOS Image>

#copy bootflash:<new-IOS Image> slavebootflash:<new-IOS Image> 

Step 2:  Change registry to  0x2102.

#config-register 0x2102

Step 3:  Update boot var to point to new image. 

#no boot system

#boot system flash <new-IOS Image>

Step 4:  Save changes.

#copy running-config startup-config

Step 5: Reload standby switch first.

#redundancy reload peer

Reloads the VSS standby chassis and brings it back online running the new version of the Cisco IOS software. Due to the software version mismatch between the two chassis, the VSS standby chassis will be in RPR redundancy mode. Also, before reloading the VSS standby chassis, make sure you wait long enough to ensure that all configuration synchronization changes have completed.

Step 6: After standby switch comes back online run a switch over.

#redundancy force-switchover

Step 7: Once last switch comes back in SSO with new image, perform another switch over to return to original state master/slave.

#redundancy force-switchover

[Leo Laohoo]

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@Reza Sharifi wrote:

If they are configured in VSS, the fastest option is to load the new IOS in both primary and backup, set your boot variable and reload both chassis.

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 I agree with Reza.  DO NOT attempt to do an upgrade with ISSU or FSU/eFSU.