R3102-R3103-HP 6600/HSR6600 Routers MPLS Configuration Guide

Configuring LDP to establish LSPs dynamically

Network requirements

Router A, Router B, and Router C support MPLS.

Configure LDP to establish LSPs between Router A and Router C so that subnets 11.1.1.0 / 24 a n d

21.1.1.0/24 can reach each other over MPLS. Test the connectivity of the LSPs.

Figure 14 Network diagram

Configuration considerations

• Enable LDP on the LSRs. LDP dynamically distributes labels and establishes LSPs and thus there is no

need to manually configure labels for LSPs.

• LDP uses routing information for label distribution. You must configure a routing protocol to learn

routing information. OSPF is used in this example.

Configuration procedure

1. Configure IP addresses for the interfaces, according to Figure 14. (Details not shown.)

2. Configure OSPF to ensure IP connectivity between the routers:

# Configure OSPF on Router A.

<RouterA> system-view

[RouterA] ospf

[RouterA-ospf-1] area 0

[RouterA-ospf-1-area-0.0.0.0] network 1.1.1.9 0.0.0.0

[RouterA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] network 11.1.1.0 0.0.0.255

[RouterA-ospf-1-area-0.0.0.0] quit

[RouterA-ospf-1] quit

# Configure OSPF on Router B.

<RouterB> system-view

[RouterB] ospf

[RouterB-ospf-1] area 0

[RouterB-ospf-1-area-0.0.0.0] network 2.2.2.9 0.0.0.0

[RouterB-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] network 20.1.1.0 0.0.0.255

[RouterB-ospf-1-area-0.0.0.0] quit

[RouterB-ospf-1] quit

# Configure OSPF on Router C.