We were running Cisco ASR 1006 on single RP2/ESP since long time but today two purchased secondary (standby) RP2/ESP for redendency. Now question is how do i upgrade IOS on secondary RP2?

I am confused with ISSU method, I thought ASR1006 is hardware redundant so it doesn't need ISSU, so we individually upgrade R0 and R1 without any ISSU, i may be wrong. can someone explain how does ISSU process work and how i can use it to upgrade ASR1006?


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