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