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Upgrade Catalyst C9500

Upgrading Catalyst 9500 series switch is relatively easy. The one that I'm going to upgrade today is on Install mode containing packages.conf file. Install mode consumes far less resources in compared to the traditional bundle mode and has some advantage like auto upgrade when configured in stacked mode. We can talk about the difference between bundle and install mode later on. Let's focus on upgrading the Catalyst 9500 switch.

Switch I am trying to upgrade is in 17.03.03 which has some bugs and security vulnerabilities.

I am upgrading it from 17.03.03 to 17.6.5(MD) golden image present in the cisco download site for C9500 series switch and also reading down the linked document from cisco that is what they recommend. You can have a look at it .
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-9300-series-switches/221498-recommended-releases-for-catalyst-9200-9.html



We will first need to create FTP username and password in the switch. The username and password must be same as per created in the FTP server. 
My source IP on this case while trying to connect to FTP server is on vrf (Mgmt-vrf). So while trying to copy the image from FTP to the Flash we must also mention the vrf.






Let's now copy the file into the flash of the switch which I have already downloaded and added into our FTP server. You can see as mentioned about I have also mentioned the vrf as the source IP that connects to the FTP server 10.27.31.180 is in Mgmt-vrf.

Once the image is upload all we need to do is install the file using the below command. Switch will reboot at the end and will take around 10 minutes to boot back up.








After the reboot switch will now boot using the new stable image which is 17.06.05 in our case.







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