10-02-2015 06:55 AM
Hello,
I am interesting if it is possible to change vPC keep alive link IP address without disruption traffic flow on working vPC domain ? If yes please share procedures ?
Thanks in advance,
San
10-03-2015 12:02 AM
Hi San,
Changing the IP address of the vPC peer keepalive is possible without causing any disruption to the operation of the vPC members. Undertaking a change to the IP address would be seen as a peer keepalive link failure, and as per the vPC Peer-Keepalive Failure section of the Cisco NX-OS Software Virtual PortChannel: Fundamental Concepts design guide:
"If connectivity of the peer-keepalive link is lost but peer-link connectivity is not changed, nothing happens; both vPC peers continue to synchronize MAC address tables, IGMP entries, and so on. The peer-keepalive link is mostly used when the peer link is lost, and the vPC peers use the peer keepalive to resolve the failure and determine which device should shut down the vPC member ports."
Based on the above, the procedure would simply be to change the IP address of the interface being used for the keepalive e.g., the IP address of the mgmt. 0 interface, and then change the peer-keepalive destination <address> used within the vpc domain <domain_id> configuration.
Regards
10-04-2015 01:46 AM
Hello Steve,
Did you trued changing vPC keep alive link in production network is it truly non disruptive ?
Thanks in advance,
San
10-12-2015 10:02 AM
San,
I have tested the above request in our lab and its not disruptive.
-Raj
10-14-2015 12:01 PM
Hi Steve,
I have done this in production as well without disruption. The original installer had the peer-keepalive link going through the peer link which is not a good idea. I was able to move it to the management interface without disruption.
Mark
06-23-2020 11:36 PM
The peer-keepalive link can be changed during production without disruption to traffic flow. The procedure is:
vpc domain <vpc_domain_id>
peer-keepalive destination <peer-switch keepalive IP> source <switch keepalive IP> vrf <peer-keepalive vrf>
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