Administrator Guide

Microsoft Network Load Balancing
Network load balancing (NLB) is a clustering functionality that is implemented by Microsoft on Windows 2000 Server and Windows
Server 2003 operating systems. Microsoft NLB clustering allows multiple servers running Microsoft Windows to be represented by one
MAC and one IP address to provide transparent failover and load-balancing. The Dell EMC Networking OS does not recognize server
clusters by default; you must configure NLB functionality on a switch to support server clusters. The maximum NLB entry limit from 8 to 11
is increased and support for more CAM-ACL to increase.
Topics:
• arp (for Multicast MAC Address)
• mac-address-table static (for Multicast MAC Address)
• ip vlan-flooding
arp (for Multicast MAC Address)
To associate an IP address with a multicast MAC address in the switch when you configure multicast mode of network load balancing
(NLB), use address resolution protocol (ARP).
Syntax
arp ip-address multicast-mac-address interface
To remove an ARP address, use the no arp ip-address command.
Parameters
ip-address Enter an IP address in dotted decimal format.
multicast-mac-
address
Enter a 48-bit hexadecimal address in nn:nn:nn:nn:nn:nn format for the static MAC
address to be used to switch multicast traffic.
interface Enter any of the following keywords and slot/port[/subport] or number information:
• For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then
the slot/port/subport[/subport] information.
• For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/
port information.
• For a port channel interface, enter the keywords port-channel then a number.
• The interface specified here must be one of the interfaces configured using the
{output-range | output} interface option with the mac-address-
table static command.
Defaults Not configured.
Command Modes CONFIGURATION
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC
Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.3(0.0) Added support for association of an IP address with multicast MAC address on the S4810,
S4820T, S6000, and Z9000 platforms.
Usage Information For multicast mode of NLB, to associate an IP address with a multicast MAC address in the switch, use address
resolution protocol (ARP) by entering the arp ip-address multicast-mac-address command in Global
configuration mode. This setting causes the multicast MAC address to be mapped to the cluster IP address for
NLB mode of operation of the switch.
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