CHAPTER
67-1
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
67
Configuring ERSPAN
This module describes how to configure Encapsulated Remote Switched Port Analyzer (ERSPAN). The
Cisco ERSPAN feature allows you to monitor traffic on ports or VLANs and send the monitored traffic
to destination ports.
Note The ERSPAN feature is not supported on Layer 2 switching interfaces.
This module describes the feature and consists of these sections:
• Information About ERSPAN, page 67-2
• How to Configure ERSPAN, page 67-5
• Configuration Examples for ERSPAN, page 67-6
• Verifying ERSPAN, page 67-6
• Additional References for Configuring ERSPAN, page 67-8
• Feature Information for ERSPAN, page 67-9
Note For complete syntax and usage information for the switch commands used in this chapter, see the
Cisco IOS Command Reference Guides for the Catalyst 4500 Series Switch.
If a command is not in the Cisco Catalyst 4500 Series Switch Command Reference , you can locate it in
the Cisco IOS Master Command List, All Releases.
Prerequisites for ERSPAN
• Only IPv4 delivery/transport header is supported.
• Access control list (ACL) filter is applied before sending the monitored traffic on to the tunnel.
• Only supports Type-II ERSPAN header.
• The extended VLAN ID that is reserved for each ERSPAN session cannot be used for any other
purpose, until the ERSPAN source session is present in the configuration. Use the show vlan
internal usage command to display the extended VLAN ID.
• This feature is supported on Cisco Catalyst 4500-E Supervisor Engines 7-E, 7L-E, 8-E, 8L-E, and
4500-X Series Switches.
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