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xStack® DES-3200 Series Layer 2 Ethernet Managed Switch CLI Reference Guide
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NETWORK LOAD BALANCING (NLB) COMMANDS
The Network Load Balancing (NLB) commands are used to configure the Switch to support Network Load Balancing Service, a
proprietary Microsoft implementation of server clustering and load balancing, suitable for various stateless applications such as
FTP, VPN and Web servers. Client requests for such applications can be distributed among multiple servers in a cluster that share
a single IP address and a single destination MAC address. Client requests are forwarded to all servers in the cluster but only one
will actually process the request.
The Switch operates NLB in unicast mode or multicast mode. In both modes, a shared destination MAC address is used as the
destination MAC address in the client request frame. However, in the server that actually processes the request will use its own
MAC address in the reply frame.
Please consult Microsoft’s server documentation for more information on using and setting up NLB on Windows servers.
The NLB commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the following
table:
Command Parameters
create nlb unicast_fdb <macaddr>
delete nlb unicast_fdb <macaddr>
config nlb unicast_fdb <macaddr> [add | delete] <portlist>
create nlb multicast_fdb [<vlan_name 32> | vlanid <vlanid 1-4094>] <macaddr>
delete nlb multicast_fdb [<vlan_name 32>| vlanid <vlanid 1-4094>] <macaddr>
config nlb multicast_fdb [<vlan_name 32>| vlanid <vlanid 1-4094>] <macaddr> [add | delete] <portlist>
show nlb fdb
Each command is listed, in detail, in the following sections: