Avaya Configuring MPLS Services Manuel d'utilisateur télécharger pdf (Page 22)

Configuring MPLS Services

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Label Switching Router

A label-switching router (LSR) is a router that contains all label-switching

interfaces. The LSR controls MPLS forwarding in the MPLS network. An LSR

performs table lookup on received packets and, based on the packet label,

forwards the packet or packet stream to the specified outgoing interface. The LSR

swaps the labels of the packet headers before transmitting the packets to the

MPLS network.

Label Edge Router

A label edge router (LER) is an LSR that resides between the IP and MPLS

networks. This router performs two generalized functions:

• It receives non-MPLS traffic, labels that traffic, and forwards it to another

label-switching interface.

• It receives labeled MPLS traffic, strips the label from the packets, and

forwards the traffic over a non-MPLS interface.

Note:

An ATM LSR currently consists of an ATM switching device that works

with a UNIX UltraSPARC workstation running Solaris and LDP. For

information about how to configure an ATM LSR, refer to the documentation

provided with your switching device.

Note:

This guide describes how to configure the LER. For information about

how to start MPLS on the router, see Chapter 2, “Starting MPLS.” For

information about how to customize the ATM router interface for MPLS, see

Chapter 3, “Customizing the MPLS Configuration.”

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Avaya Configuring MPLS Services Manuel d'utilisateur Page 22