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

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

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About this content

Preface

Using YANG Data Models

Getting Started with Traffic Mirroring

Traffic mirroring
Configuration guidelines for traffic mirroring
Restrictions for traffic mirroring
Traffic mirroring terminology
Traffic mirroring types
How traffic mirroring works

ACL-based traffic mirroring

ACL-based traffic mirroring
How ACL-based traffic mirroring works
Configure ACLs for traffic mirroring
Configure layer 3 ACL-based traffic mirroring
Attach a source interface
Multiple SPAN ACL sessions for MPLS

Local SPAN

Local SPAN
Configuration guidelines for local SPAN
Restrictions for local SPAN
Configure local SPAN
Local SPAN with ACLs
Local SPAN rate limit

ERSPAN

ERSPAN
Configuration guidelines for ERSPAN
Restrictions for ERSPAN
Supported ERSPAN sessions
ERSPAN over GRE
Partial packet capture for ERSPAN
ERSPAN with flexible CLI
ERSPAN rate limit
ERSPAN rate-limit per destination
Traffic mirroring with DSCP
Monitor ERSPAN sessions with SPAN and security ACLs
Selective packet capture for protocol and drops

SPAN to file

SPAN to file
Always-On SPAN to file with periodic write
SPAN to file with unique capture

Mirror forward-drop packets

Mirror forward-drop packets
Guidelines for mirroring forward-drop packets
Restrictions for mirroring forward-drop packets
Configure forward-drop packets

Mirror buffer drop packets

Mirror buffer drop packets
Guidelines for mirroring buffer drop packets
Configure buffer drop packets mirroring for SPAN to file
Configure buffer drop packets mirroring for ERSPAN

File Mirroring

File mirroring
Restrictions for file mirroring
Configure file mirroring

How to troubleshoot traffic mirroring

Troubleshoot traffic mirroring issues
Additional debug commands

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

File mirroring

Updated: September 8, 2026

Want to summarize with AI?

This chapter details the File mirroring feature, which automatically copies files and directories from an active Route Processor (RP) to a standby RP or RSP. It eliminates manual intervention for file synchronization, ensuring redundancy.

File mirroring

Restrictions for file mirroring

This section provides the limitations and requirements for using file mirroring, including supported system types and synchronization directions.

Configure file mirroring

Learn how to enable and configure the file mirroring feature to synchronize files between Route Processors.

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Bias-free language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.