Manual

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3. Appoint the mirror destination, and the destination can be the physical port or the tunnel
Command
Explanation
Global Mode
monitor session <session> destination tunnel interface
<interface-number> desmac < MAC address > desIP <
Dest IP address > scrIP < Source IP address
no monitor session <session> destination tunnel
interface <interface-number>
Appoint the mirror destination to
be the physical port or the
tunnel; the no command deletes
the mirror destination.
59.3 Typical Examples of ERSPAN
Before ERSPAN is invented, network administrators had to connect their PCs directly to the
switches, in order to check the status of the network.
However, with the help of ERSPAN, network administrators can configure and supervise the
switches remotely, which brings more efficiency.
In Layer 3 network, Device A connects to the marketing department through Ethernet 1/1, and
connects to Ethernet1/2 of Device B through Ethernet 1/2; Device C connects to the server
through Ethernet 1/2, and connects to Ethernet 1/1 of Device B through Ethernet 1/1. Server is
able to monitor the bidirectional traffic of the marketing department across a GRE tunnel by
configuring remote port mirroring. The figure below shows a sample application of ERSPAN.
ERSPAN application diagram
tunnel <tunnel-number>
no monitor session <session>
destination tunnel <tunnel-number>
command deletes the mirror destination tunnel.