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
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 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.