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learned, traffic is forwarded to only one server rather than the entire cluster, and failover and balancing
are not preserved.
To preserve failover and balancing, the switch forwards the traffic destined for the server cluster to all
member ports in the VLAN connected to the cluster. To ensure that this happens, you must configure the
ip 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 MAC
address representing the cluster is given in the payload. Then, all the traffic destined for the cluster is
flooded out of all member ports. Since all the servers in the cluster receive traffic, failover and balancing
are 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 RP2
triggers 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. Old
ARP 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 the
ip vlan-flooding CLI configuration. Apart from it, there is no indication of the enabling of this
capability.
mac-address-table static (for Multicast MAC Address)
For multicast mode of network load balancing (NLB), configure a static multicast MAC address, associate
the multicast MAC address with the VLAN used to switch Layer 2 multicast traffic, and add output ports
that will receive multicast streams on the VLAN. To delete a configured static multicast MAC address from
the MAC address table on the router, enter the no mac-address-table static multicast-mac-
address command.
Syntax
mac-address-table static multicast-mac-address multicast vlan
vlan-id range-output {single-interface | interface-list |
interface-range}
To remove a MAC address, use the no mac-address-table static
multicast-mac-address output interface vlan vlan-id command.
Parameters
multicast-mac-
address
multicast
884
Enter the 48-bit hexadecimal address in nn:nn:nn:nn:nn:nn
format.
Enter a vlan port to where L2 multicast MAC traffic is
forwarded.
Microsoft Network Load Balancing
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