learned, traffic is forwarded to only one server rather than the entire cluster, and failover and balancingare not preserved.To preserve failover and balancing, the switch forwards the traffic destined for the server cluster to allmember ports in the VLAN connected to the cluster. To ensure that this happens, you must configure theip vlan-flooding command on the Dell switch at the time that the Microsoft cluster is configured.The server MAC address is given in the Ethernet frame header of the ARP reply, while the virtual MACaddress representing the cluster is given in the payload. Then, all the traffic destined for the cluster isflooded out of all member ports. Since all the servers in the cluster receive traffic, failover and balancingare preserved.Enable and Disable VLAN Flooding• The older ARP entries are overwritten whenever newer NLB entries are learned.• All ARP entries, learned after the feature is enabled, are deleted when the feature is disabled, and RP2triggers an ARP resolution. The feature is disabled with the no ip vlan-flooding command.• When a port is added to the VLAN, the port automatically receives traffic if the feature is enabled. OldARP entries are not deleted or updated.• When a member port is deleted, its ARP entries are also deleted from the CAM.• Port channels in the VLAN also receive traffic.• There is no impact on the configuration from saving the configuration.• The feature, if enabled, is displayed in the show running-config command output that displays theip vlan-flooding CLI configuration. Apart from it, there is no indication of the enabling of thiscapability.arp (for Multicast MAC Address)To associate an IP address with a multicast MAC address in the switch when you configure multicastmode of network load balancing (NLB), use address resolution protocol (ARP).Syntax arp ip-address multicast-mac-address interfaceTo remove an ARP address, use the no arp ip-address command.Parameters ip-address Enter an IP address in dotted decimal format.multicast-mac-addressEnter a 48-bit hexadecimal address in nn:nn:nn:nn:nn:nnformat for the static MAC address to be used to switchmulticast traffic.interface Enter any of the following keywords and slot/port or numberinformation:• For a Port Channel interface, enter the keywords port-channel then a number. The range is from 1 to 128.1096 Microsoft Network Load Balancing
