Manual

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Москва, Новозаводская ул., 18, стр. 1
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Chapter 59 ERSPAN
59.1 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.
59.2 ERSPAN Configuration Task List
1. Specify mirror source port
2. Specify mirror destination tunnel
Command
Explanation
Global Mode
monitor session <session> source
{interface <interface-list>} {rx| tx| both}
no monitor session <session> source
{interface <interface-list>}
Specify the mirror source port; the no
command deletes the mirror source port.
Command
Explanation
Global Mode
monitor session <session> destination
Specify the mirror destination tunnel; the no