Configuring Label Edge Routing - Cisco Catalyst 8540 MSR Configuration Manual

Atm switch router software configuration guide

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Configuring Label Edge Routing

destination on network 180.0.0.0.

Figure 16-7 ATM MPLS Example Network Packet Transmission

The packet from network 130.0.0.0 enters router AdminRt1 at Ethernet interface 2/3 with a destination

IP address on network 180.0.0.0. The router preforms a standard routing table lookup and determines

the packet should be routed out ATM interface 0/0 to the next hop interface 140.0.0.1 on interface ATM

1/0/0. By using CEF (Cisco Express Forwarding) the Layer 3 switched packet interface FIB (forwarding

information base) is queried and the next hop is determined to be out through ATM MPLS interface

3/0/0. Prior to transmission to the next LSR an MPLS label (or VPI/VCI) is appended to the packet just

before the destination IP address.

From this point on through the MPLS network, the only information that is checked by the successive

LSRs is the label information in the packet. When the packet reaches the edge LSR the MPLS label is

popped off and subsequent switching is completed using Layer 3 and standard routing practices.

Configuring Label Edge Routing

This section describes label edge router (LER) for the Cisco Catalyst 8540. With LER, the Cisco Catalyst

8540 can be installed at the edge of a packet- and cell-based network with both or either of them

MPLS-enabled. LER also supports multiple TVCs to the same destination prefix and allows a TVC to

ATM Switch Router Software Configuration Guide

shows a packet as it traverse a network from its source on network 130.0.0.0 to its

Loopback 1.1.1.1

Loopback 5.5.5.5

= Packet with VPI/VCI label

Configuring Tag Switching and MPLS

Loopback 2.2.2.2

Loopback 3.3.3.3

Loopback 4.4.4.4

Catalyst 8510 msr Lightstream 1010