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Health Check found "Management Interface Multicast Connectivity" Errors

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Created: Apr-23-2026 02:29

Summary:

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 Mult ...

Reply

Prosi Posted 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.
Newbie319815 Posted 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.