Label Switched Path (LSP) Self-Ping (RFC7746)
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-08
Internet Society Requests For Comment (RFCs)
R. Bonica: AUTHOR [+5]
Ingress Label Switching Routers (LSRs) use RSVP-TE [RFC3209] to establish MPLS Label Switched Paths (LSPs). The following paragraphs describe RSVP-TE procedures.
Internet Engineering Task Force (IETF) R. Bonica Request for Comments: 7746 Juniper Networks Category: Standards Track I. Minei ISSN: 2070-1721 Google, Inc. M. Conn D. Pacella L. Tomotaki Verizon January 2016
Label Switched Path (LSP) Self-Ping
When certain RSVP-TE optimizations are implemented, ingress Label Switching Router (LSRs) can receive RSVP RESV messages before forwarding state has been installed on all downstream nodes. According to the RSVP-TE specification, the ingress LSR can forward traffic through a Label Switched Path (LSP) as soon as it receives a RESV message. However, if the ingress LSR forwards traffic through the LSP before forwarding state has been installed on all downstream nodes, traffic can be lost.
This document describes LSP Self-ping. When an ingress LSR receives an RESV message, it can invoke LSP Self-ping procedures to ensure that forwarding state has been installed on all downstream nodes.
LSP Self-ping is a new protocol. It is not an extension of LSP Ping. Although LSP Ping and LSP Self-ping are named similarly, each is designed for a unique purpose. Each protocol listens on its own UDP port and executes its own procedures.
LSP Self-ping is an extremely lightweight mechanism. It does not consume control-plane resources on transit or egress LSRs.
Bonica, et al. Standards Track [Page 1]
RFC 7746 LSP Self-Ping January 2016
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC...