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61.1 Introduction to ERSPAN
ERSPAN （Encapsulated Remote Switched Port Analyzer） eliminates the limitation that the source port and the
destination port must be located on the same switch. This feature makes it possible for the source port and
the destination port to be located on different devices in the network, and facilitates the network administrator
to manage remote switches. Compared with the traditional RSPAN, ERSPAN configuration is simpler and it
makes the monitored traffic to be transmitted in the specified tunnel.
To be noticed
1. Monitor source of ERSPAN monitor only supports port monitor, it does not support CPU monitor and
flow monitor presently.
2. For the source and destination switches in the ERSPAN connections, a tunnel must be existed.
3. When configuring the remote mirror function, the network bandwidth should be considered in order
to carry the network flow and the mirrored flow.
Keywards:
ERSPAN: Encapsulated Remote Switched Port Analyzer.
61.2 ERSPAN Configuration Task List
1. Specify mirror source port
Command
Global Mode
monitor session <session> source
{interface <interface-list>} {rx| tx| both}
no monitor session <session> source
{interface <interface-list>}
2. Specify mirror destination tunnel
Command
Global Mode
Chapter 61 ERSPAN
Explanation
Specify the mirror source port; the no
command deletes the mirror source port.
Explanation
61-46
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Troubleshooting
