Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 561
Enabling a Switch for Multicast NLB
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CONFIGURATION mode ip vlan-flooding 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. Microsoft Network Load Balancing 561
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