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LSP Ping/Traceroute for Prefix SID in Presence of Multi-Algorithm/Multi- Topology Networks

Document Type Expired Internet-Draft (individual)
Authors Zafar Ali , Carlos Pignataro , Faisal Iqbal
Last updated 2021-08-27 (Latest revision 2021-02-23)
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


[RFC8287] defines the extensions to MPLS LSP Ping and Traceroute for Segment Routing IGP-Prefix and IGP-Adjacency Segment Identifier (SIDs) with an MPLS data plane. The machinery defined in [RFC8287] works well in single topology, single algorithm deployments where each Prefix SID is only associated with a single IP prefix. In multi-topology networks, or networks deploying multiple algorithms for the same IP Prefix, MPLS echo request needs to carry additional information in the Target FEC Stack sub-TLVs to properly validate IGP Prefix SID. This document updates [RFC8287] by modifying IPv4 and IPv6 IGP-Prefix Segment ID FEC sub-TLVs to also include algorithm identification while maintaining backwards compatibility. This document also introduces new Target FEC Stack sub-TLVs for Prefix SID validation in multi-topology networks.


Zafar Ali
Carlos Pignataro
Faisal Iqbal

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)