VxRail has two separate and distinct management networks. One management network extends externally to connect to IT administration and external data center services. The second management network is isolated and visible only to the VxRail nodes.
Figure 1. VxRail management networks. This figure shows the VxRail management networks.
The network that is visible only to the VxRail nodes depends on IPv6 multicasting
services that are configured on the adjacent ToR switches for node discovery purposes.
One node is automatically designated as the primary node and acts as the source. The
primary node listens for packets from the other nodes using multicast. A VLAN assignment
on this network limits the multicast traffic to the interfaces connected to the internal
management network.
You can implement VxRail using IPv4 single stack, IPv4 single stack, or dual
stack. If the customer uses IPv4 single stack, IPv6 multicast and unicast capabilities
are required because of auto discovery and upgrade.
Multicast Listener Discovery (MLD) snooping and querier is designed to constrain flooding of multicast traffic by examining MLD messages and forwarding the traffic only to interested interfaces. Traffic on this node discovery network is constrained through the configuration of this VLAN on the ports supporting the VxRail cluster. This setting may provide incremental efficiency benefits, but does not negatively impact network efficiency.
If your data center networking policy restricts the IPv6 multicast protocol, IP
addresses can be manually assigned to the VxRail nodes as an alternative to automatic
discovery.
If the customer uses manual discovery instead of auto discovery, IPv6 multicast is not
required. However, IPv6 unicast (enabled on the node port) is still required for
upgrade. For more information, see KB 192047.
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