Relayed Echo Reply Mechanism for Label Switched Path (LSP) Ping (RFC7743)
Original Publication Date: 2016-Jan-01
Included in the Prior Art Database: 2016-Feb-08
Internet Society Requests For Comment (RFCs)
J. Luo: AUTHOR [+8]
This document describes extensions to the Label Switched Path (LSP) Ping specified in [RFC4379] by adding a Relayed Echo Reply mechanism that could be used to report data-plane failures for inter-AS (Autonomous System) and inter-area LSPs. Without these extensions, the ping functionality provided by [RFC4379] would fail in many deployed inter-AS scenarios, since the replying Label Switching Router (LSR) in one AS may not have an available route to the initiator in the other AS. The mechanism in this document defines a new Message Type referred to as the "Relayed Echo Reply message" and a new TLV referred to as the "Relay Node Address Stack TLV".
Internet Engineering Task Force (IETF) J. Luo, Ed. Request for Comments: 7743 ZTE Updates: 4379 L. Jin, Ed. Category: Standards Track ISSN: 2070-1721 T. Nadeau, Ed. Brocade G. Swallow, Ed. Cisco January 2016
Relayed Echo Reply Mechanism for Label Switched Path (LSP) Ping
In some inter-AS (Autonomous System) and inter-area deployment scenarios for RFC 4379 ("Label Switched Path (LSP) Ping and Traceroute"), a replying Label Switching Router (LSR) may not have the available route to an initiator, and the Echo Reply message sent to the initiator would be discarded, resulting in false negatives or a complete failure of operation of the LSP Ping and Traceroute. This document describes extensions to the LSP Ping mechanism to enable the replying LSR to have the capability to relay the Echo Response by a set of routable intermediate nodes to the initiator. This document updates RFC 4379.
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 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7743.
Luo, et al. Standards Track [Page 1]
RFC 7743 MPLS LSP Ping Relayed Echo Reply January 2016
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