Reference Guide

● To verify if NLB VLAN flooding is enabled, enter the show running-config command. The command output displays the
ip vlan-flooding CLI configuration, if enabled.
Configuring NLB on a Switch
You can enable NLB functionality to operate in unicast or multicast mode on a switch.
To enable NLB unicast mode:
Enter the ip vlan-flooding command to enable Layer 3 unicast data traffic routed through a VLAN port to be flooded on
all member ports of the VLAN connected to a server cluster.
CONFIGURATION mode
ip vlan-flooding
Unicast data traffic flooding is performed only on packets that use ARP entries that are resolved through ARP packets in which
the Ethernet MAC source address (SA) is different from the MAC information inside the ARP packet.
To enable multicast NLB mode:
1. Configure a L2 multicast configuration to associate the cluster MAC address and a subset of ports within a VLAN.
CONFIGURATION mode
mac-address-table static multicast-mac-address vlan vlan-id output-range interface
2. Configure a static ARP entry to associate the cluster IP address with the corresponding multicast NLB MAC address.
Specify any of the interfaces entered in the L2 multicast configuration in Step 1.
CONFIGURATION mode
arp ip-address multicast-mac-address interface
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