Nlb Settings; Lldp - D-Link xStack Reference Manual

xStack® DES-3200 Series Layer 2 Ethernet Managed Switch WEB UI Reference Guide

NLB Settings

The Network Load Balancing commands are used to configure the Switch to support Network Load Balancing (NLB),
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. Unicast is the default operation mode. To support this
mode the switch between clients and servers must allow L2 unicast packets to be forwarded to multiple NLB
servers.The other mode is multicast mode. With multicast mode the NLB servers share identical unicast IP address
called Cluster IP and a multicast MAC address called Flooding MAC. In both modes, a shared destination MAC
address is used as the destination MAC address in the client request frame, however 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 NLBS on Windows
servers.
To view this window, click L2 Features > NLB Settings:
The following parameters can be set:
Parameter Description
Unicast/Multicast
Click on the radio button for mode in which NLB will operate.
VLAN Name
Enter the name for the VLAN of the NLB multicast FDB entry being created.
VID
Enter the VLAN ID of the NLB multicast FDB entry being created.
MAC Address
Type the MAC address to enter into the NLB Forwarding Data Base.
Port
Choose the forwarding ports to be used for the configured NLB unicast FDB entry.
Click Apply to implement the changes made.

LLDP

The Link Layer Discovery Protocol (LLDP) allows stations attached to an IEEE 802 LAN to advertise, to other stations
attached to the same IEEE 802 LAN. The major capabilities provided by this system is that it incorporates the station,
the management address or addresses of the entity or entities that provide management of those capabilities, and the
identification of the station's point of attachment to the IEEE 802 LAN required by those management entity or entities.
The information distributed via this protocol is stored by its recipients in a standard Management Information Base
(MIB), making it possible for the information to be accessed by a Network Management System (NMS) through a
management protocol such as the Simple Network Management Protocol (SNMP).
Figure 3 - 51. NLB Settings window
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