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Feature Description - MPLS 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - MPLS
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PBR to an LSP

PBR to an LSP

Policy-based routing (PBR) enables a device to select routes based on a user-defined policy, which helps transmit traffic securely or balance traffic. On an MPLS network, IP packets that meet a PBR policy can be forwarded along a specified LSP. Figure 2-11 illustrates an MPLS network on which PBR is used.

On the network shown in Figure 2-11, Device F and Device G are added to a legacy network to provide new services. To allow part of the new services to pass through the original network, the PBR can be configured on Device A. The services that meet a specific PBR policy can travel along LSPs over the original network.

  • The traffic for original services is forwarded through the original network.

  • The traffic for new services is forwarded by Device F and Device G.

Figure 2-11 Application of the PBR to an LSP

To forward part of the traffic of new services through the original network, you can configure the PBR to an LSP on Device A. The traffic matching the specific policy can be forwarded through the original network.

You can also use PBR with LDP fast reroute (FRR) to divert some traffic to a backup LSP to balance traffic between the primary and backup LSP may be idle relatively.

Updated: 2019-01-14

Document ID: EDOC1100058933

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