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Configuring Multiple Instances of LDP

LDP is a protocol used to distribute labels in an MPLS-enabled network.

LDP instances are used to distribute labels from a provider edge (PE) router to a customer edge (CE) router. LDP instances in a VPN are useful in carrier-of-carrier networks, where data is transmitted between two or more telecommunications carrier sites across a core provider network. Each carrier may want to restrict Internet routes strictly to the PE routers.

An advantage of using LDP instances within a VPN is that a full-mesh internal BGP (IBGP) is not required between the PE and CE routers. A router ID is required to configure an instance of LDP.

To configure multiple instances of LDP, include the following statements:



routing-instances {



routing-instance-name {
interface interface-name;
instance-type vrf;


protocols {


ldp {
... ldp-configuration ...
}


}


}


}

You can include the statements at the following hierarchy levels:

[edit routing-instances routing-instance-name protocols]
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols]

For more information about configuring LDP, see the JUNOS MPLS Applications Configuration Guide. For more information about configuring LDP over VPNs, see the JUNOS VPNs Configuration Guide.

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