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Overview of Segment Routing Statistics

Traffic statistics in a segment routing network can be recorded in an OpenConfig compliant format for the Layer 3 interfaces. The statistics is recorded for the Source Packet Routing in Networking (SPRING) traffic only, excluding RSVP and LDP-signaled traffic, and the family MPLS statistics per interface is accounted for separately. The SR statistics also includes SPRING traffic statistics per link aggregation group (LAG) member, and per segment identifier (SID). To enable recording of segment routing statistics, include sensor-based-stats statement at the [edit protocol isis source-packet-routing] hierarchy level.

Earlier, sensors were available for collecting segment routing statistics for MPLS transit traffic only, which is MPLS-to-MPLS in nature. On MX Series routers with MPC and MIC interfaces and PTX Series routers, additional sensors are introduced to collect segment routing statistics for MPLS ingress traffic, which is IP-to-MPLS in nature. With this feature, you can enable sensors for label IS-IS segment routing traffic only, and stream the statistics to a gRPC client.

You can enable the segment routing statistics for MPLS ingress traffic using the egress option under the per-sid configuration statement. The resource name for the per-sid egress functionality is:

/junos/services/segment-routing/sid/egress/usage/

You can view the label IS-IS route association with the sensors using the show isis spring sensor info command output. This command does not display counter values of the actual sensors.

The segment routing statistics records are exported to a server. You can view segment routing statistics data from the following the OpenConfig paths:

  • /mpls/signalling-protocols/segment-routing/aggregate-sid-counters/aggregate-sid-counter[ip-addr='L-ISIS-10.1.1.1']/state/counters[name='oc-xxx']/out-pkts

  • /mpls/signalling-protocols/segment-routing/aggregate-sid-counters/aggregate-sid-counter[ip-addr='L-ISIS-10.1.1.1']/state/counters[name='oc-xxx']/out-pkts

Note:

  • Graceful Routing Engine switchover (GRES) is not supported for segment routing statistics.

    Nonstop active routing (NSR) is not supported for label IS-IS. During a Routing Engine switchover, a new sensor is created in the new primary Routing Engine, replacing the sensor created by the previous primary Routing Engine. As a result, at the time of a Routing Engine switchover, the segment routing statistics counter start from zero.

  • Graceful restart is not supported for label IS-IS.

    In case of graceful restart, the existing sensor is deleted and a new sensor is created during IS-IS initialization. The segment routing statistics counter restarts from zero.

  • In-service software upgrade (ISSU) and nonstop software upgrade (NSSU) are not supported. In such cases, the segment routing statistics counter is restarted.

  • Zero-statistics segment routing data is suppresses and does not get streamed to the gRPC clients.

Related Documentation