Per-Path or Per-Segment-List Traffic Statistics

The Segment Routing Traffic Engineering (SRTE) Traffic Statistics Collection feature enables you to gather traffic statistics for both ingress IP traffic and transit MPLS traffic traversing SRTE tunnels. This functionality allows you to configure statistics at both the tunnel level and the per-path level, providing granular insights into traffic flow. This section describes about the applied per-path or per-segment-list traffic statistics that is unique for each sub candidate path of a SRTE tunnel.

You can configure per-segment-list to enable SRTE to generate a sensor ID and statistics handler. The statistics handler, including the sensor ID, is downloaded as part of SRTE route gateways. It is used in the gateway during route programming, pushing sensor information to the Packet Forwarding Engine (PFE) if the route is downloaded to the Forwarding Information Base (FIB). To collect traffic statistics from the PFE, two optional path-level sensors are available: Ingress and Transit.

Sensor name generation varies for colored and uncolored tunnels.

• For colored tunnels, the sensor name format remains unchanged. The segment ID, previously filled with the sub-candidate path ID, is now filled with the segment-list ID.

• For uncolored tunnels, reuse the last component of the sensor name (lsp-name) to fill the segment-list ID instead of the sub-candidate path name. The segment ID is filled in hexadecimal format for both tunnel types.

The sample for sensor name format and the change in sensor name format are highlighted.

Table 1: Sensor Name Format

Tunnel Type	Sensor Type	Current Format	Format after the change
Colored	Ingress	4.4.4.4-2-1e-0-0.0.0.0-0-80	4.4.4.4-2-1e-0-0.0.0.0-0-80
	Transit	4.4.4.4-2-1e-0-0.0.0.0-0-80-f4241	4.4.4.4-2-1e-0-0.0.0.0-0-80-f4241
Uncolored	Ingress	i;st;0;f;tunnel-1;SCpath1	i;st;0;f;tunnel-1;80
	Transit	t;st;0;f;tunnel-1;SCpath1	t;st;0;f;tunnel-1;80