Supported LDP Standards
Junos OS substantially supports the following RFCs and Internet drafts, which define standards for LDP.
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RFC 3212, Constraint-Based LSP Setup using LDP
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RFC 3478, Graceful Restart Mechanism for Label Distribution Protocol
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RFC 7060, Using LDP Multipoint Extensions on Targeted LDP Sessions
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RFC 8661, Segment Routing MPLS Interworking with LDP
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RFC 8077, Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)
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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.”
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RFC 3215, LDP State Machine
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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:
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Label distribution control (section 2.6.1): Ordered mode is supported, but not Independent mode.
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Label retention (section 2.6.2): Liberal mode is supported, but not Conservative mode.
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Label advertisement (section 2.6.3): Both Downstream Unsolicited mode and Downstream on Demand mode are supported.
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RFC 5283, LDP Extension for Inter-Area Label Switched Paths (LSPs)
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RFC 5443, LDP IGP Synchronization
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RFC 5561, LDP Capabilities
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RFC 6512, Using Multipoint LDP When the Backbone Has No Route to the Root
Only the Recursive Opaque Value is supported.
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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.