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7. MPLS Support of Diff-Serv over PPP, LAN, Non-LC-ATM and Non-LC-FR Interfaces

The general operations for MPLS support of Diff-Serv, including label forwarding and LSP setup operations are specified in the previous sections. This section describes the specific operations required for MPLS support of Diff-Serv over PPP interfaces, LAN interfaces, ATM Interfaces which are not label controlled and Frame Relay interfaces which are not label controlled.

On these interfaces, this specification allows any of the following LSP combinations per FEC:

  • Zero or any number of E-LSP, and

  • Zero or any number of L-LSPs.

A Diff-Serv capable LSR MUST support E-LSPs which use preconfigured `EXP<-->PHB mapping' over these interfaces.

A Diff-Serv capable LSR MAY support E-LSPs which use signaled `EXP<-->PHB mapping' and L-LSPs over these interfaces.