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ARP issues between Nexus 7K and F5 LTM

Thiyagu
Altocumulus
Altocumulus

Hi Team,

We have faced a weird issue in our environment.

issue:

loadbalancer-1 failedover to Load balancer-2. Whereas all the production traffic flow did not failover properly to load balancer-2 for around 25 minutes. After 25 minutes load balancer-2 started getting production traffic to the VIPs.

 

Does anyone have experienced similar ARP issue between F5 LTM and Nexus 7K at the time of fail-over?

Is there any workaround to this issue meaning any configuration change on LTM and the time of issue?

Is there any configuration change on LTM which would help to trigger GARP request two or three time to the upstream N7K?

 

Regards,

Thiyagu

1 REPLY 1

Henric_Petterss
Altocumulus
Altocumulus

Don't know if it is the problem here, but F5 LTM will not send out GARP for vlans where it doesn't have a self-ip. We noticed that recently when we got the same problem as you have. We did not have self-ip in all vlans so the VIP's on that were not moved in a failover. We added a self-ip on that vlan (in the matching ip-subnet), and then failover started working again.