4500X VSS - upgrade ISSU or without ISSU (without outage)

[Nilay Patel]

I am running 3.4.5 & need to up grade 3.5.3 what are option I have. ROM is compatible with 3.5.3E

ROM: 15.0(1r)SG10

Current version - 03.04.05.SG 

attached information is confusing, please help 

######

& other option 2 without outage

@@@ is it possible 

show running-config,

show redundancy state

Switch# show redundancy

Load IOS on both SUP

copy ftp bootflash:

copy bootflash: slavebootflash:

boot system flash bootflash:new_image

4500# show bootvar

#(CONFIG T)#config-register 0x2102

# wr mem

#redundancy reload peer

wait & check active standby hot & repeat

#redundancy force-switchover

Switch# show redundancy

##

[Leo Laohoo]

Look at the release date for 3.5.3.  It is 09 May 2014. 

TAC would not be that stupid to recommend a firmware that is >4 years old.  

I'd recommend the latest 3.6.X.

[Nilay Patel]

Thanks Leo,

can you guide how to go 3.6.X. without outage from 3.5.4?

[nazimkha]

Hi Nilay, Am I looking at some wrong attachment ?

[Nilay Patel]

Thanks - it was wrong attachments. I just updated

[Reza Sharifi · Accepted solution]

Hi,

When doing a major upgrade like this, ISSU will not work.  Actually, ISSU does not work most of the time as expected and can cause more outage than you originally planned for.  Have a maintenance window, load the new IOS, set the boot parameters, save and reboot both chassis. The 4500x take about 5 to 6 minute to fully boot.

HTH 

[Nilay Patel]

thanks a lot

[Reza Sharifi]

If you plan it well (load the IOS ahead of time and verify it) the entire window should not take more than 30 minutes.

If you have a service contract, you also may want to open a support ticket so, a tac engineer can be online during the process.

Good Luck!

HTH