VSAN-Troubleshooting-Reference-Manual

Diagnostics and Troubleshooting Reference Manual – Virtual SAN
Changing multicast settings when multiple Virtual SAN
clusters are present
When multiple Virtual SAN clusters are configured on the same network, it is
recommended that the different Virtual SAN clusters are given distinct multicast
ranges. This avoids any hosts from different clusters processing each other’s
multicast traffic.
To change the multicast address on an ESXi host configured for Virtual SAN, identify
the VMkernel interface configured for Virtual SAN by running this command:
esxcli vsan network list
You should see an output similar to:
Interface
VmkNic Name: vmk2
IP Protocol: IPv4
Interface UUID: 6a836354-bf24-f157-dda7-001517a69c72
Agent Group Multicast Address: 224.2.3.4
Agent Group Multicast Port: 23451
Master Group Multicast Address: 224.1.2.3
Master Group Multicast Port: 12345
Multicast TTL: 5
esxcli vsan network ipv4 set
Now change the multicast addresses used by Virtual SAN using this command:
esxcli vsan network ipv4 set -i -d -u
The Master Group Multicast address is used for updating CMMDS between the
master and the backup nodes via port 12345. The Agent Group Multicast Address is
used for sending heartbeats to all the nodes in the cluster via port 23451. For
example, to set the Master Group Multicast address (also called upstream) to
224.2.3.5, and the Agent Group Multicast Address (also called downstream) to
224.2.3.6, use the following ESXCLI command on each ESXi host for this particular
Virtual SAN cluster:
esxcli vsan network ipv4 set -i vmk2 -d 224.2.3.6 -u 224.2.3.5
This command will have to be repeated on every ESXi host that is in the same
Virtual SAN Cluster.
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