Verifying LSP Use in Your Network

Purpose

When you verify the valid use of an LSP on the ingress and transit routers in your network, you can determine if there is a problem with Multiprotocol Label Switching (MPLS) in your network. Figure 7 describes the example network used in this chapter.

Figure 7: MPLS Topology for Verifying LSP Use

The MPLS network in Figure 7 illustrates a router-only network with SONET interfaces that consist of the following components:

• A full-mesh interior Border Gateway Protocol (IBGP) topology, using AS 65432
• MPLS and Resource Reservation Protocol (RSVP) enabled on all routers
• A send-statics policy on routers R1 and R6 that allows a new route to be advertised into the network
• An LSP between routers R1 and R6

The network shown in Figure 7 is a Border Gateway Protocol (BGP) full-mesh network. Since route reflectors and confederations are not used to propagate BGP learned routes, each router must have a BGP session with every other router running BGP. For the full configuration for each router in the example network, see Configuring MPLS on a Network.

Steps To Take

To verify LSP use in your network, follow these steps:

1. Verifying an LSP on the Ingress Router
2. Verifying an LSP on a Transit Router