Overview

This chapter explains a traffic monitoring feature that captures traffic to PCAP files for later analysis. It details capabilities such as partial packet capture, transmit (Tx) direction mirroring, continuous Always-On capture with periodic writes, and Unique Capture to reduce redundant data.

SPAN to file

This section explains the SPAN to file feature, which mirrors network traffic to files in PCAP format for offline analysis. It covers configuration options for buffer sizes and types, and provides a comprehensive history of feature support across various software releases and hardware platforms.

Always-On SPAN to file with periodic write

This section explains the Always-On SPAN to file feature, which provides continuous packet capture for investigating traffic drops. It details functionalities like periodic file writing and storage management, allowing for issue diagnosis without the need to reproduce faults or change configurations.

SPAN to file with unique capture

This section explains the SPAN to file with unique capture feature, which captures a single packet for each punt-reason or interface.