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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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LDP for LC-ATM

This section covers some specifics on LDP when running on an LC-ATM interface.

Label Space

Per-interface label space is used for LC-ATM interfaces. As you can see in Example 5-12, it means that the peer LDP is not identified with router-id:0 as in the non-LC-ATM case. The number following the peer LDP router Identifier is now non-zero. If you have multiple links between a pair of ATM LSRs, multiple label spaces will exist between them. Look at Example 5-12 to see that the ATM LSRs washington-atm and brussels-atm have two ATM links between them and two label spaces.

Example 5-12. Per-Interface Label Space
washington-atm#show mpls ldp discovery
Local LDP Identifier:
    10.200.253.2:0
Discovery Sources:
    Interfaces:
        ATM0/0/0 (ldp): ...

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