Segment Routing v6 Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

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Segment Routing v6 Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Releases

SRv6 policy counters

Updated: September 8, 2026

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Explains how policy, candidate-path, segment-list, and interface counters support traffic monitoring, policy validation, troubleshooting, capacity planning, and forwarding verification.

Policy counters are metrics used in networking that

  • measure and report traffic statistics for specific policies,

  • enable network administrators to monitor and manage network performance, and

  • support capacity planning by providing detailed usage insights.

Table 1. Feature History Table

Feature Name

Release Information

Feature Description

SRv6 policy counters (POL.CP.SL.INT.E)

Release 25.3.1

Introduced in this release on: Fixed Systems (8200 [ASIC: Q200, P100], 8700 [ASIC: P100, K100], 8010 [ASIC: A100]); Centralized Systems (8600 [ASIC:Q200]); Modular Systems (8800 [LC ASIC: Q200, P100])

Network administrators can now monitor and manage network performance, capacity planning, and traffic engineering by reviewing the policy counters (POL.CP.SL.INT.E) in SRv6-TE.

This feature is enabled by default.

SRv6 policy traffic counters

POL.CP.SL.INT.E stands for Per-SR-policy, per Candidate-Path, per-Segment-List, per-interface, egress traffic counter. This counter in SRv6 is used to measure and report traffic statistics for specific paths and interfaces within a network policy. It provides granular insights into the traffic flow through different segments and interfaces of a network policy, enabling effective network management and optimization.

To optimize hardware resources, you can use the hw-module profile cef te-tunnel highscale-no-ldp-over-te command to enable high-scale MPLS-TE tunnel support in CEF while disabling LDP-over-TE. For more information, see MPLS Configuration Guide for Cisco 8000 Series Routers.

Benefits of SRv6 policy counters POL.CP.SL.INT.E

The benefits of SRv6 policy counters POL.CP.SL.INT.E are:

  • Network optimization: By analyzing the detailed traffic data, network operators can make informed decisions to optimize the network, such as rerouting traffic to avoid congestion.

  • Troubleshooting: In case of network issues, these counters provide the necessary data to quickly identify and resolve problems.

  • Policy validation: Ensuring that the implemented SRv6 policies are functioning as intended and making adjustments as needed based on the counter data.

Verify SRv6 policy counters

The purpose of this task is to retrieve SRv6 policy counter information.

Procedure

Run the following show commands to view the policy counter details.

Example:

Note that SRv6 policy prefixes will have a /64 address 
Router#show segment-routing traffic-eng forwarding policy color 2
Fri Sep  5 12:12:46.083 UTC

SR-TE Policy Forwarding database
--------------------------------

Color: 2, End-point: 2::1
  Name: srte_c_2_ep_2::1
  Binding SID: fccc:cc06:1:e008::
  Active LSP:
    Candidate path:
      Preference: 100 (configuration)
      Name: po_r2_inetv6
    Segment lists:
      SL[0]:
        Name: r1_r2_remote_uN
        SL ID: 0xa000003
        Paths:
          Path[0]:
            Outgoing Interfaces: HundredGigE0/0/0/19
            Next Hop: fe80::2
            Switched Packets/Bytes: 1002000/296592000
            FRR Pure Backup: No
            ECMP/LFA Backup: No
            SID stack (Top -> Bottom): {}
          Path[1]:
            Outgoing Interfaces: Bundle-Ether1201
            Next Hop: fe80::2
            Switched Packets/Bytes: 998000/295408000
            FRR Pure Backup: No
            ECMP/LFA Backup: No
            SID stack (Top -> Bottom): {}
          Path[2]:
            Outgoing Interfaces: Bundle-Ether1301
            Next Hop: fe80::3
            Switched Packets/Bytes: 0/0
            FRR Pure Backup: Yes
            ECMP/LFA Backup: Yes
            SID stack (Top -> Bottom): {fccc:cc00:3:e001::/64}

  Policy Packets/Bytes Switched: 2000000/592000000
 
Router#show cef ipv6 accounting
fccc:cc06:1:e008::/64
Accounting: 2000000/592000000 packets/bytes output (per-prefix-per-path mode)
 via fe80::2/128, HundredGigE0/0/0/19
  path-idx 0
  next hop fe80::2/128
  Accounting: 1002000/296592000 packets/bytes output
 via fe80::2/128, Bundle-Ether1201
  path-idx 1
  next hop fe80::2/128
  Accounting: 998000/295408000 packets/bytes output
 via fe80::3/128, Bundle-Ether1301
  path-idx 2
  next hop fe80::3/128
  Accounting: 0/0 packets/bytes output