CHAPTER 17
Configuring ERSPAN
This chapter contains the following sections:
•
Information About ERSPAN, page 159
•
Licensing Requirements for ERSPAN, page 161
•
Prerequisites for ERSPAN, page 162
•
Guidelines and Limitations for ERSPAN, page 162
•
Default Settings for ERSPAN, page 164
•
Configuring ERSPAN, page 164
•
Configuration Examples for ERSPAN, page 176
•
Additional References, page 177
Information About ERSPAN
The Cisco NX-OS system supports the Encapsulated Remote Switching Port Analyzer (ERSPAN) feature on
both source and destination ports. ERSPAN transports mirrored traffic over an IP network. The traffic is
encapsulated at the source router and is transferred across the network. The packet is decapsulated at the
destination router and then sent to the destination interface.
ERSPAN consists of an ERSPAN source session, routable ERSPAN generic routing encapsulation
(GRE)-encapsulated traffic, and an ERSPAN destination session. You can separately configure ERSPAN
source sessions and destination sessions on different switches.
ERSPAN Types
ERSPAN Type III supports all of the ERSPAN Type II features and functionality and adds these enhancements:
•
Provides timestamp information in the ERSPAN Type III header that can be used to calculate packet
latency among edge, aggregate, and core switches.
•
Identifies possible traffic sources using the ERSPAN Type III header fields.
•
Cisco Nexus 3548 Switch NX-OS System Management Configuration Guide, Release 6.x
159
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