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Accurate LSP verification is essential in SR-MPLS networks to ensure that traffic reaches the intended egress node, especially in networks where some routers run legacy software versions. We validated Nil Forwarding Equivalence Class (Nil-FEC) egress verification for SR-MPLS LSP ping and MPLS traceroute. We created an SR-MPLS domain with one PE acting as the probe source and another PE as the egress node, while one transit router operated on legacy software. From the source PE, we sent both MPLS Echo Request (LSP ping) and MPLS traceroute probes that carried the Egress TLV with Nil-FEC and repeated the test over two paths. In the first path, the probes traversed HPE ACX7100-48L, which processed the Nil-FEC information and returned the expected egress indication. In the second path, the probes traversed an Arista 7280R3, which responded with standard TTL-expired behavior for the hop. We observed return code 3 (Replying router is an egress for the FEC at stack-depth) on the replies from HPE and ZTE PE devices, which is the backward-compatible NIL-FEC validation behavior, and is defined in RFC 8029. Support for the updated RFC (RFC 9655) can be tested in future interoperability events. The figure below shows the Nil-FEC egress validation test topology and the two probe paths used during the run. |
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[[~[~[Figure 74: Nil-FEC Egress-Validation for SR-MPLS Ping~>~>image:485164879128494081_SRMPLS-19-NIL-FEC-Generic-1-v1.png~|~|alt="Figure 74" width="550"~]~]>>attach:485164879128494081_SRMPLS-19-NIL-FEC-Generic-1-v1.png||target="_blank"]] |
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Arista 7280R3, |
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HPE ACX7100-48L |
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HPE MX204, |
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ZTE ZXR10 M6000-3S Plus |
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Table 40: Nil-FEC Egress-Validation for SR-MPLS Ping - IS-IS |
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|[[< Previous>>doc:TI-LFA with Flex-Algo over SR MPLS]]|[[Next ~>>>doc:Multi-Instance ISIS TLV #7]] |
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