Traffic Mirroring Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Release

PDF

Traffic Mirroring Configuration Guide for Cisco 8000 Series Routers, Cisco IOS XR Release

Local SPAN

Updated: September 8, 2026

Want to summarize with AI?

Log in

This section explains Local SPAN, a basic traffic mirroring feature that copies traffic between source and destination interfaces on the same router. It provides a definition of the feature and includes a history of supported hardware and software releases.

Local SPAN is a traffic mirroring feature and the most basic form of traffic mirroring that

  • mirrors both source and destination interfaces on the same router, and

  • simplifies the router setup and reduces the need for additional hardware.

Table 1. Feature History Table

Feature Name

Release Information

Description

Egress Support on Local SPAN

Release 26.3.1

Introduced in this release on: Fixed Systems (8200 [ASIC: P100], 8700 [ASIC: P100, K100], 8010 [ASIC: A100]); Centralized Systems (8400 [ASIC: K100]); Modular Systems (8800 [LC ASIC: P100])

You can now mirror outgoing traffic on the Cisco 8000 Series routers to verify exactly what the device forwards toward the next hop. This egress-only mirroring focuses on outgoing traffic without mixing in unrelated ingress traffic.

With this feature, you create a monitor session, define a destination interface, and attach the source interface to this session and specify the transmission direction. The router replicates the egress packets to the destination, allowing you to troubleshoot network performance and connectivity effectively. This enhancement provides better visibility into your network traffic flow.

This feature introduces these changes:

CLI

  • A new keyword, egress-only is introduced.

Local SPAN

 Release 25.4.1

Introduced in this release on: Fixed Systems (8010 [ASIC: A100])(select variants only*)

*This feature is supported on:

  • 8011-32Y8L2H2FH

  • 8011-12G12X4Y-A/D

Local SPAN

 Release 25.2.1

Introduced in this release on: Modular Systems (8800 [LC ASIC: P100])(select variants only*)

*This feature is now supported on:

  • 88-LC1-36EH

  • 88-LC1-12TH24FH-E

Local SPAN

 Release 25.1.1

Introduced in this release on: Fixed Systems (8010 [ASIC: A100])

Local SPAN allows you to monitor network traffic on a single switch by copying traffic from one or more source ports or VLANs to a destination port for analysis. This process occurs entirely within the same device, ensuring that both source and destination ports are located on it. You can monitor and analyze traffic without affecting the normal operation of the network.

This feature is now supported on:

  • 8011-4G24Y4H-I