Configuration Guide ERSPAN Configuration
Typical ERSPAN Configuration Examples
Topological Diagram
Figure 2 ERSPAN application topology
Application Requirements
 The network analyzer can monitor the user via remote mirroring.
 Data can be exchanged normally between devices.
Configuration Tips
On the source device, set the port (Gi 0/1) directly connected with user as the
source port, and set the port (Gi 0/2) connected with the intermediate device as
the output port.
On the intermediate device, the ports (Gi 0/1 and Gi 0/2) respectively connected
with the source and destination devices should be the member ports of SVI port
in two network segments, and the two IP network segments must be able to
communicate with each other.
Configuration Steps
Configure the ERSPAN source device.
! On the switch A, create the ERSPAN Session 1; configure this switch as the
source device and configure the port Gi 0/1 as the source port.
SwitchA(config)#monitor session 1 erspan-source
SwtichA(config-mon-erspan-src)#source interface gigabitEthernet 0/1 both
SwtichA(config-mon-erspan-src)#origin ip address 10.1.1.2
SwtichA(config-mon-erspan-src)#destination ip address 12.1.1.2
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