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monitor session <session> destination
tunnel <tunnel-number>
no monitor session <session>
destination tunnel <tunnel-number>
3. Appoint the mirror destination, and the destination can be the physical port or the tunnel
Command
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>
61.3 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.
Specify the mirror destination tunnel; the no
command deletes the mirror destination
tunnel.
Explanation
Appoint the mirror destination
to be the physical port or the
tunnel; the no command
deletes the mirror destination.
61-47
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Troubleshooting
