# Switching between different VLANs

Introduction

The goal is to do switching between VLAN 10 and VLAN 20.
VLAN 10 is on Switch1, VLAN20 is on Switch2, and VLAN30 is on both switches.

Native VLAN

Switch1(config)# vtp mode transparent
Switch1(config)# interface gi0/1
Switch1(config-if)# switchport
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation dot1q
Switch1(config-if)# switchport trunk allowed vlan 10,30
Switch1(config-if)# switchport trunk native vlan 10
Switch1(config-if)# no cdp enable
Switch1(config-if)# spanning-tree bpdufilter enable

Switch2(config)# vtp mode transparent
Switch2(config)# interface gi0/1
Switch2(config-if)# switchport
Switch2(config-if)# switchport mode trunk
Switch2(config-if)# switchport trunk encapsulation dot1q
Switch2(config-if)# switchport trunk allowed vlan 20,30
Switch2(config-if)# switchport trunk native vlan 20
Switch1(config-if)# no cdp enable
Switch2(config-if)# spanning-tree bpdufilter enable

VLAN translation (mapping)

Switch1(config)# vtp mode transparent
Switch1(config)# interface gi0/1
Switch1(config-if)# switchport
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation dot1q
Switch1(config-if)# switchport trunk allowed vlan 10,30

Switch2(config)# vtp mode transparent
Switch2(config)# interface gi0/1
Switch2(config-if)# switchport
Switch2(config-if)# switchport mode trunk
Switch2(config-if)# switchport trunk encapsulation dot1q
Switch2(config-if)# switchport trunk allowed vlan 20,30
Switch2(config-if)# switchport vlan mapping enable
Switch2(config-if)# switchport vlan mapping 10 20