To create extended VLAN (1006 – 4096), the switch must be configured as VTP transparent mode. Extended-range VLANs are not learned by VTP and are not added to the VLAN database, but when VTP mode is transparent, VTP mode and domain name and all VLAN configurations are saved in the running configuration.
Native VLAN:
- Documentation: http://networkers-online.com/blog/2008/06/native-vlan-explained/
- Native VLAN is a dot1Q concept that was created for backward compatibility with old devices that don’t support VLANs. Native Vlan is only used for trunk port.
- How native Vlan works?
- Frames belonging to the native VLAN are not tagged when sent out on the trunk links so older devices can simply understand.
- Frames received untagged on the trunk links are set to the native VLAN.
- Configure native VLAN on router sub-interface
- Frame sent out of this sub-interface will be stripped off VLAN information
- Frame without VLAN information received from this interface will be assigned with native VLAN tag
nterface FastEthernet0/0.501
encapsulation dot1Q 501 native ip address 200.0.51.5 255.255.255.240 |
- Configure native VLAN on switch trunk port:
- Frame with VLAN tag 501 sent out of this port will be stripped off VLAN tag
- Frames without VLAN information received from this port will be assigned with native VLAN tag
interface FastEthernet1/1switchport trunk native vlan 501
switchport mode trunk |