There is no capability negotiation done for Label Distribution Protocol (LDP) applications that set up Label Switched Paths (LSPs) for IP prefixes or that signal point-to-point (P2P) Pseudowires (PWs) for Layer 2 Virtual Private Networks (L2VPNs). When an LDP session comes up@ an LDP speaker may unnecessarily advertise its local state for such LDP applications even when the peer session is established for some other applications like Multipoint LDP (mLDP) or the Inter- Chassis Communication Protocol (ICCP). This document defines a solution by which an LDP speaker announces to its peer its disinterest in such non-negotiated applications@ thus disabling the unnecessary advertisement of corresponding application state@ which would have otherwise been advertised over the established LDP session.
RFC 7473-2015 history
2015RFC 7473-2015 Controlling State Advertisements of Non-negotiated LDP Applications