Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Networks Using Entropy Labels (ELs) (RFC8012)
Original Publication Date: 2016-Nov-01
Included in the Prior Art Database: 2016-Nov-08
Internet Society Requests For Comment (RFCs)
N. Akiya: AUTHOR [+5]
[RFC4379] describes LSP traceroute as an operation where the initiating LSR sends a series of MPLS echo requests towards the same destination. The first packet in the series has the TTL set to 1. When the echo reply is received from the LSR one hop away, the second echo request in the series is sent with the TTL set to 2. For each additional echo request, the TTL is incremented by one until a response is received from the intended destination. The initiating LSR discovers and exercises ECMP by obtaining Multipath Information from each transit LSR and using a specific destination IP address or specific entropy label.
Internet Engineering Task Force (IETF) N. Akiya Request for Comments: 8012 Big Switch Networks Updates: 6790 G. Swallow Category: Standards Track C. Pignataro ISSN: 2070-1721 Cisco A. Malis Huawei Technologies S. Aldrin Google November 2016
Label Switched Path (LSP) and Pseudowire (PW) Ping/Trace over MPLS Networks Using Entropy Labels (ELs)
Multiprotocol Label Switching (MPLS) Label Switched Path (LSP) ping and traceroute are methods used to test Equal-Cost Multipath (ECMP) paths. Ping is known as a connectivity-verification method and traceroute is known as a fault-isolation method, as described in RFC 4379. When an LSP is signaled using the Entropy Label (EL) described in RFC 6790, the ability for LSP ping and traceroute operations to discover and exercise ECMP paths is lost for scenarios where Label Switching Routers (LSRs) apply different load-balancing techniques. One such scenario is when some LSRs apply EL-based load balancing while other LSRs apply load balancing that is not EL based (e.g., IP). Another scenario is when an EL-based LSP is stitched with another LSP that can be EL based or not EL based.
This document extends the MPLS LSP ping and traceroute multipath mechanisms in RFC 6424 to allow the ability of exercising LSPs that make use of the EL. This document updates RFC 6790.
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 7841.
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