Network Requirements
- PC1, PC2, and PC3 are connected with Device; PC1 and PC2 communicate in VLAN2.
- Configure VLAN SPAN on Device, the source vlan is vlan2, and the destination port is gigabitethernet0/3, realizing that PC3 monitors the packets received and sent by VLAN2 of Device.
Network Topology
![Networking of configuring VLAN SPAN](/storage/images/Document/Maipu/monitoring/config-vlan-span.jpg)
Figure 5-4 Networking of configuring VLAN SPAN
Configuration Steps
Step 1: Configure the link type of the VLAN and port.
#Create VLAN2 on Device.
Device#configure terminal
Device(config)#vlan 2
Device(config-vlan2)#exit
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#On Device, configure the link type of port gigabitethernet0/1 and gigabitethernet0/2 as Access, permitting the services of VLAN2 to pass.
Device(config)#interface gigabitethernet 0/1-0/2
Device(config-if-range)#switchport mode access
Device(config-if-range)#switchport access vlan 2
Device(config-if-range)#exit
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Step 2: Configure VLAN SPAN.
#Configure VLAN SPAN on Device, the mirror source session is vlan2, and the destination session is port gigabitethernet0/3.
Device(config)#monitor session 1 source vlan 2 both
Device(config)# monitor session 1 destination interface gigabitethernet0/3
Device#show monitor session all
Session 1
Type : SPAN Local VLAN Session
Destination Interface : gi0/3
Source VLAN(both): 2
Step 3: Check the result.
#When PC1 and PC2 communicate with each other, you can capture the packets received and sent by VLAN2 on PC3.