This section covers some specifics on LDP when running on an LC-ATM interface.
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.
washington-atm#show mpls ldp discovery Local LDP Identifier: 10.200.253.2:0 Discovery Sources: Interfaces: ATM0/0/0 (ldp): ...