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Setting Up MPLS on the MGX Switch

This section describes the steps required to set up MPLS on the RPM. This section does not provide detailed configuration information. It is intended as a guide for you to plan for MPLS in your network.

Network Topology

Use Figure 22-16 as a reference for the steps described in this section.

Figure 22-16 Setting Up MPLS on the MGX Switch

Follow these steps to set up MPLS on the MGX switch:

Step 1

The Cisco 7200 series router is cabled to the BPX, added as a shelf, and configured as the LSC.

Step 2

The MGX 8250 PXM1 is cabled to the BPX (this is in addition to the feeder trunk).

Step 3

The MGX 8250 PXM1 line is configured as a UNI or NNI line. An AutoRoute port and resource partition are added to the line.

Step 4

The BPX virtual trunk (the other end of the PXM1 line) is activated (upped) and added. MPLS partitions must be configured on the virtual trunks. A VPI is assigned to the virtual trunk.

Step 5

The BPX virtual trunks are identified to the LSC as MPLS trunks.

Step 6

The RPM on the MGX 8250 switch is initialized: The IOS image is loaded, and the ATM switch interface is active.

Step 7

Enable OSPF or IS-IS routing on the RPM. These are the recommended routing protocols for interior routing in MPLS networks.

Step 8

Activate Cisco Express Forwarding (CEF) on the RPM.

Step 9

Assign an area to the RPM. This area defines which devices this RPM can communicate with in the network. For example, if you assign area 100 to this RPM, all other RPMs it communicates with must also be assigned area 100.

Step 10

Create an MPLS subinterface on the RPM ATM switch interface.

Step 11

Assign an IP address to the subinterface.

Step 12

Enable MPLS on the subinterface.

Step 13

Create a VP tunnel on the subinterface. The VP tunnel is assigned a VPI number, which must be the same at both ends of the tunnel. The VPI number must also match the VPI assigned to the BPX virtual trunk in Step 4.

Step 14

Add an ATM PVP on the subinterface. The VPI for the PVP must match that of the VP tunnel.

Step 15

Add a VP connection to the PXM1 UNI or NNI line that is attached to the PXM switch. Make sure the connection VPI matches that of the PVP and VP tunnel. You must add both a master and a slave connection (one on the RPM, the other on the PXM1), because this is a local connection.

Step 16

Your RPM is now ready to function as an ELSR in the network.


You have completed the steps necessary for setting up MPLS on the MGX switch.

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