Cisco Catalyst 9800-40 Wireless Controller

[lachimi-sanyasi]

Hi Have upgraded Cisco Catalyst 9800-40 Wireless Controller from 17.6.6 to 17.09.05 and it was working fine for few hours. I notice it went back to its previous version when I login next time. Any reason why? please help

 

[lachimi-sanyasi]

so 17.12.3 is better than 17.09.05? 

Does it have any bugs? please help me to choose the best one. I can't afford to have more downtime.

cheers

[Mark Elsen]

                      - You should go to 17.12.3 , probably even 17.12.4 ,    
    17.9.x is considered End Of Life ; in these complex ages there will always be bugs , but it must be seen
     from a context that  the improvements should always be more important then (remaining) bugs , 

 M.

[Leo Laohoo]

We have dumped 17.9.X because it is FUBAR. 

We are currently on 17.12.3 and have started testing/migrating to 17.12.4.

[Rich R]

1. Every version of code has bugs - just about selecting the one which has the least number of bugs affecting the features you use and testing it.
2. Always refer to the TAC recommended code - link below.  TAC are still recommending 17.12.3 but there are a number of crucial fixes in 17.12.4. 
3. I would normally say use the TAC recommended option but like Leo and others we have dumped 17.9 and moved to 17.12.4.  Note that there are SMUs and APSP (which address a number of WLC and AP bugs in 17.12.4) available which should be installed together with 17.12.4.
4.  And always remember to COMMIT after you upgrade!