Service Manual

There might be some ARP table entries that are resolved through ARP packets, which had the Ethernet MAC SA different
from the MAC information inside the ARP packet. This unicast data traffic flooding occurs only for those packets that use
these ARP entries.
Enabling a Switch for Multicast NLB
To enable a switch for Multicast NLB mode, perform the following steps:
1. Add a static ARP entry by entering the arp ip-address multicast-mac-address command in the Global
configuration mode to associate an IP address with a multicast MAC address in the switch.
CONFIGURATION mode
arp ip-address multicast-mac-address interface
This setting causes the multicast MAC address to be mapped to the Cluster IP address for the NLB mode of operation of the
switch.
NOTE: While configuring static ARP for the Cluster IP, provide any one of the interfaces that is used in the static
multicast MAC configuration, where the Cluster host is connected. As the switch does not accept only one ARP-
interface pair, if you configure static ARP with each egress interface, the switch overwrites the previous egress-
interface configuration.
2. Associate specific MAC or hardware addresses to VLANs.
CONFIGURATION mode
mac-address-table static multicast-mac-address vlan vlan-id output-range interface
NOTE:
When you use the mac-address-table static multicast-mac-address command in a VLT setup,
Dell EMC Networking OS recommends to add VLTi as one of the egress interfaces along with other cluster facing
interfaces.
534 Microsoft Network Load Balancing