How to configure 802.1Q trunking between Cisco Catalyst 4000 - 4500 - 5000 - 5500 - 6000 - 6500 Switches that run CatOS and Cisco IOS System Software.
In 802.1Q trunking, all VLAN packets are tagged on the trunk link, except the native VLAN.
The native VLAN packets are sent untagged on the trunk link.
Therefore, the native VLAN must be the same on both switches configured for trunking.
This makes it easy to deduce to which VLAN a frame belongs when a frame is received with no tag.
By default, VLAN 1 is the native VLAN on all switches.
In Catalyst OS (CatOS), the native VLAN can be changed when the set vlan vlan-id mod/port command is issued, where mod/port is the trunk port.
In Cisco IOS Software, the native VLAN can be changed when the switchport trunk native vlan vlan-id interface command is issued, which is configured on the trunk port.
To enable the 802.1Q trunking on a CatOS and integrated Cisco IOS Software (native mode) switch, issue these commands:
 | In the CatOS switch: |
cat6000>set trunk mod/port [on , desirable , auto , nonegotiate] dot1q
In the integrated Cisco IOS (native mode) switch: cat6500(config-if)#switchport trunk {encapsulation dot1q}
For more information visit:
802.1Q Trunking Between Catalyst Switches Running CatOS and Cisco IOS System Software
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