topic Re: SnapMirror traffic is being routed through e0M instead in Data Protection

SnapMirror traffic is being routed through e0M instead

georgewong2424 — Wed, 26 Mar 2025 06:58:07 GMT

While monitoring network port traffic, we observed that SnapMirror traffic is being routed through e0M instead of e0f and e3d (InterCluster LIF). Unified Manager indicates that e0M utilization has reached 100%, while e0f shows 0%.

Since e0f and e3d have been configured as the SnapMirror InterCluster LIFs, we expected the traffic to be routed through e0f.

I checked the Broadcast Domain, I found that only the e0f and e3d ports on both nodes are in the independent Broadcast Domain, no e0M in the Broadcast Domain group.

Re: SnapMirror traffic is being routed through e0M instead

Sergey_Osipov — Wed, 26 Mar 2025 11:02:04 GMT

Check the routing

Most probably you are facing with traffic egression

https://kb.netapp.com/on-prem/ontap/da/NAS/NAS-KBs/Network_traffic_not_sent_or_sent_out_of_an_unexpected_interface_after_upgrade_to_9.2_due_to_elimination_of_IP_Fastpath

Re: SnapMirror traffic is being routed through e0M instead

Sanaman — Thu, 27 Mar 2025 05:06:22 GMT

I would suggest to check the service policy of your inter-cluster lif if it is allowed for inter cluster traffic.