Migrating L3 Switching From A NX6K VPC pair to NX9K VPC pair - downtime.

[CiscoMedMed]

I am trying to move routing from one NX VPC pair to another. The NX6K currently has EIGRP enabled on its SVIs and HSRP is enabled on the SVIs on each member of the pair. At present I have 802.1Q trunking between the 6K's and the 9K's - all good. Devices attached to the 9K are able to route as needed via the 6K.  I have on the 9K matching SVI's with HSRP all in admin down state. And EIGRP on the 9K is in down state. I'm trying to think through the process of getting the 9K to take over the routing of all the traffic with no or minimal down-time. If I no shut an SVI I see HSRP goes to listening state. Any thoughts on the best order? Thank you.

[balaji.bandi · Accepted solution]

The high level you can do as below. (not sure what issue you have encountered)

1 On new 9K  vPC - bring the HSRP with different IP with Low Priority, so they go in Listening mode ( Old one still active-standby).

2. bring the EIGRP also up on the new 9K, so the routing will be active and have peering.

3. make sure you have any STP take care of as old still be active root bridge, New 9K will be different priority.

Hope this makes sense?  (if you still see the issue, sharing the config and small network diagram help us to help better).

Note: make sure you understand the changes and logic - since you are the one deploying the changes - we suggest best what understand based on the input.

[CiscoMedMed]

Thank you. Yes this is clear. I have STP set to a lower priority (higher value) on the 9Ks at this point. 

I'll try to lab this out in CML too.