Health Check found "Management Interface Multicast Connectivity" Errors 10

Newbie319815 Lv1Posted Apr-23-2026 02:29


Hello,

I am running a health check on a newly deployed 4-node HCI cluster.

I am encountering some errors under "Configuration / Network Interface / Management Interface → Management Interface Multicast Connectivity" (see attached image).





This seems very unusual to me, as all four nodes can communicate with each other (I tested connectivity using ping from the hypervisor iDRAC). Additionally, there were no errors when adding the four servers to the new cluster, nor when creating the aSAN.
My Management interface is configured as a VLAN subinterface over an aggregated interface composed of two physical NICs, using Static Link Aggregation – Layer 4 load balancing (Mode: 2) on all nodes in the cluster.






What could I be doing wrong to get this error? We don’t even have multicast implemented in this infrastructure. I’m currently running a demo to replace VMware, and VMware does not require this to be implemented as indicated in the error message.
Is multicast mandatory in Sangfor?
Thank you.

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Newbie319815 Lv1Posted Apr-23-2026 09:34
  
The infrastructure runs two Dell OS10 switches in a VLT (Virtual Link Trunking) stack configuration acting as Top-of-Rack (TOR) switches for the Sangfor HCI cluster. Upon investigation, we found that IGMP Snooping was enabled and correctly configured on LEAF-1, but had been explicitly disabled on LEAF-2 (no ip igmp snooping enable was present in its running configuration).

As a result, LEAF-2 was not processing IGMP Join messages from any of the four HCI nodes. Combined with the multicast flood-restrict feature being active, multicast traffic was not being forwarded correctly to the hosts connected to that switch.

Resolution:
We enabled IGMP Snooping globally and on VLAN "Management" on LEAF-2:

  ASB277-LEAF-2(config)# ip igmp snooping enable
  ASB277-LEAF-2(config)# interface vlan 'ID MANAGEMENT'
  ASB277-LEAF-2(conf-if-vl-200)# ip igmp snooping

The health check alert for Management Interface Multicast Connectivity is now cleared.
Prosi Lv3Posted Apr-23-2026 10:32
  
Yes—multicast is critical in the Sangfor HCI management network, and this error is caused by a switch (or bonding setup) not forwarding multicast traffic.
Enable multicast forwarding on the switch VLAN.
Temporarily disable IGMP snooping for testing.
Make sure the LAG on the switch side matches the server configuration.
Make sure the multicast MAC address is not filtered.

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