Supported LDP Standards

Junos OS substantially supports the following RFCs and Internet drafts, which define standards for LDP.

• RFC 3212, Constraint-Based LSP Setup using LDP

• RFC 3478, Graceful Restart Mechanism for Label Distribution Protocol

• RFC 7060, Using LDP Multipoint Extensions on Targeted LDP Sessions

• RFC 8661, Segment Routing MPLS Interworking with LDP

• RFC 8077, Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)

• Internet draft draft-napierala-mpls-targeted-mldp-01.txt, Using LDP Multipoint Extensions on Targeted LDP Sessions

The following RFCs do not define standards, but provide information about LDP. The IETF classifies them as “Informational.”

• RFC 3215, LDP State Machine

• RFC 5036, LDP Specification

  For the following features described in the indicated sections of the RFC, Junos OS supports one of the possible modes but not the others:

  • Label distribution control (section 2.6.1): Ordered mode is supported, but not Independent mode.

  • Label retention (section 2.6.2): Liberal mode is supported, but not Conservative mode.

  • Label advertisement (section 2.6.3): Both Downstream Unsolicited mode and Downstream on Demand mode are supported.

• RFC 5283, LDP Extension for Inter-Area Label Switched Paths (LSPs)

• RFC 5443, LDP IGP Synchronization

• RFC 5561, LDP Capabilities

• RFC 6512, Using Multipoint LDP When the Backbone Has No Route to the Root

  Only the Recursive Opaque Value is supported.

• RFC 6826, Multipoint LDP In-Band Signaling for Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths

  Junos OS support limited to point-to-multipoint extensions for LDP.