Three switches Virtual Interface
Layer switch with routing functionality, so between the two vlan can visit each other, each vlan virtual interface is the network gateway
Three switches Configuration
1. Configuration Commands
Switch (config) routing #ip
2. configure the virtual interface address
Switch (config) # VALN interface VLAN-ID
Switch (config-IF) _address Netmask IP address IP
Switch (config-IF) the shutdown NO
Following experimental environment, enabling communication between different vlan
1. pc ip address set to the corresponding
2. The three-port switch sw1 f1 / 1 f1 / 2 f1 / 3 VLAN20 VLAN30 arranged VLAN10 
. 3 sw1 port to send f1 / 0 to Trunk 
4. The three switches virtual interface is provided
. 
The switch is provided to three f / 0 port to Trunk 
. 6 ping pc2 pc3 by experimental tests were pc1