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  • Enhancements to BFD-triggered MPLS fast reroute (FRR) for unicast next hops and session-id-change-limiter-indirect (PTX10001-36MR, PTX10003, PTX10004, PTX10008, PTX10016, QFX5700, and QFX5200)—In Junos OS Evolved Release 22.2R1, we've enhanced the BFD-triggered fast reroute for unicast next hops and session-id-change-limiter-indirect to address the issue of traffic being silently discarded because of a session mismatch between the control plane and data plane.

    You can limit the re-programming of the number of parent nodes of the indirect-nexthop and prevent additional complexity in the Packet Forwarding Engine when the session-identifier id of the indirect nexthop is changed. To make those changes, use the session-id-change-limiter-indirect configuration statement at the [edit routing-options] hierarchy level.

    [See Bidirectional Forwarding Detection (BFD) for MPLS and session-id-change-limiter-indirect.]

  • Conditional RSVP label-switched path (LSP) metrics (PTX10001-36MR, PTX10003, PTX10004, PTX10008, and PTX10016)—Starting in Junos OS Evolved Release 22.2R1, you can configure conditional metrics for local statically configured LSPs. The conditional metrics are based on the dynamically changing interior gateway protocol (IGP) metric. Junos OS Evolved changes the LSP metric to the configured conditional metric that corresponds to the highest threshold the IGP metric reaches. You can configure up to four conditional metrics for an LSP.

    By default, the IGP metric of routes configured with the install statement is the IGP metric value of the LSP destination route. If you configure the track-igp-metric <install-v4-prefixes> <install-v6-prefixes> statement at the [edit protocols mpls] or [edit protocols mpls label-switched-path lsp-name] hierarchy level, the routes IGP installs use the IGP metric of the prefix instead.

    Use the conditional igp-metric-threshold threshold-metric-value static-metric-condition-value statement at the [edit protocols mpls label-switched-path lsp-name metric] hierarchy level to configure this feature. To check whether the conditional metric is configured, use the show mpls lsp extensive command.

    [See Configuring LSP Metrics, metric (Protocols MPLS), track-igp-metric (LSP), conditional-metric, and show mpls lsp extensive.]