ZyXEL Communications XS3800-28 Cli Reference Manual page 226
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Chapter 60 NLB Commands
Unicast Mode
NLB replaces the real MAC addresses of the servers in a cluster with a unicast MAC address. Each server
uses the same unicast MAC address, and a switch can't map the unicast MAC address to a port. This
forces a switch to flood traffic meant for the cluster to all ports of the switch to make sure the traffic is
forwarded to the right destination.
The servers in a cluster can't communicate with each other, because they use the same unicast MAC
address.
Multicast Mode
NLB assigns a multicast MAC address to the servers in a cluster. Therefore, each server has two MAC
addresses, the real MAC address and the multicast MAC address.
Create static ARP entries on a switch for the servers, so the switch will only forward traffic to the servers of
the cluster.
The servers in a cluster can communicate with each other, because they keep their real MAC address
and already have their own IP addresses.
Ethernet Switch CLI Reference Guide
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