ASR9010 ISSU 4.2.1 to 4.2.3 procedure

[nyhus]

                   Is there a documented procedure for upgrading from 4.2.1 to 4.2.3 using ISSU?  I know it is available in 4.2.1 so it should be possible, does one use the regular "install activate" or are there different commands?

[Alexei Kiritchenko]

Hello Mike,

4.2.1 gives ISSU infrastructure and supports 4.2.1 ISSUs SMUs only:

"For Cisco IOS XR Release 4.2.1, only Software Maintenance Upgrades (SMUs) that are identified and tagged as ISSU SMUs can be activated using ISSU."

http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.2/general/release/notes/reln_a9k_421.html#concept_3D4B5AA05D2340039E94917F84ACA856

For the future updates, even if a current version supports ISSU, that is not given ISSU would be possible for some new SW releases. For example ISSU upgrade won’t work if there would be a kernel change, or mandatory FPD upgrade or a major architecture change…

Regards,

/A