MPLS

Conditional RSVP LSP metrics (cRPD, MX960, PTX1000, and QFX10002)—Starting in Junos OS Release 22.1R1, you can configure conditional metrics for local statically configured label-switched paths (LSPs). The conditional metrics are based on the dynamically changing IGP metric. Junos OS changes the LSP metric to the configured conditional metric that corresponds to the highest threshold reached by the IGP metric. 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, routes installed by IGP 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.]

MPLS TTL propagation flexibility for LDP-signaled LSPs (MX80, MX104, MX150, MX204, MX240, MX480, MX960, MX2008, MX2010, MX2020, MX10003, MX10008, MX10016, PTX1000, PTX5000, PTX10001, PTX10008, PTX10016, and QFX10002)—Starting in Junos OS Release 22.1R1, we support disabling time-to-live (TTL) propagation at a more granular level. You can disable TTL propagation specifically for LDP-signaled label-switched paths (LSPs). When a route is very long, disable TTL propagation to ensure that the TTL doesn't expire while the packet is traversing the path. This feature also gives you more flexibility in hiding your network topology.

To disable TTL propagation for LDP-signaled LSPs, use the no-propagate-ttl statement at the [edit protocol ldp] hierarchy level.

[See no-propagate-ttl.]