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  • On a router, if a physical interface is configured with many VLANs, then sub-interfaces have to be used. Additionally, the switchport port must be a trunk. An access port will not work, I tested this.
    • Router(config)# interface g0/0.100
    • Router(config-subif)# encapsulation dot1q 100
    • Router(config-subif)# ip address
    • Switch(config)# interface g1/0/1
    • Switch(config-if)# switchport trunk encapsulation dot1q
    • Switch(config-if)# switchport mode trunk
    • Switch(config-if)# switchport trunk allowed vlan 100
  • A single vlan doesn't need to belong to a dot1q trunk to work.
    • Router(config)# interface g0/1
    • Router(config-if)# ip address
    • Switch(config)# interface g1/0/2
    • Switch(config-if)# switchport mode access
    • Switch(config-if)# switchport access vlan 200
vlans.txt · Last modified: 2016/09/20 02:56 by Derg Enterprises