Trunking and native VLAN

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Aug 11th, 2008
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i have switch 2960 and i made port 15 as trunk port. Encapsulation is dot1q. I have configured VLANs 10,20,30 on switch and of course there is VLAN 1 - nativ.

If im right in this trunked port ( 15 ), traffic is tagged for VLAN 10,20,30 and traffic for VLAN1 is untagged.

Is possible to tagg traffic for VLAN1 (nativ, default) and how?


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garytayl Mon, 08/11/2008 - 06:38
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When using dot1q the native vlan is not tagged, that is the reason why native must be the same at both ends. Now if you would like vlan1 to be tagged as well, then you need to make another vlan as native.

In the past, I have used dummy vlans (unused vlans) to be native in order to make everything else tagged.

In a nutshell, native vlan of a dot1q trunk will be untagged all other vlans will be tagged.

Hope it helps...

Marwan ALshawi Mon, 08/11/2008 - 06:40
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ALL vlan traffic will be Taged when pass the trunk except the native vlan

so if u change the native vlan to vlan 10

then all vlan will be taged when pass the trunk except vlan 10 in this case

but, it is not recomended to change the native vlan unless u have extensive knowledge in a switched network

because nitive vlan mismatch makes problem

good luck

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