From: Douglas M Todd, Jr (dtodd@PARTNERS.ORG)
Date: Wed Jun 13 2007 - 18:15:58 ART
Hello:
quick note...
Benefit of having a native vlan:
1) switches use vlan 1 as the native vlan by default
All untagged traffic is tagged using this vlan in the d1q header.
1a) Thus if you have tagged traffic which is correct, any untagged
traffic would fall in this vlan (ie., catch all)
2) the native vlan only needs to be the same when you connect switch to
switch. Thus when you configure a router to switch the native vlan for
the router can be anything you want.
3) on a router
a) encap dot1q vlan# native
ie, encap dot1q 200 native
4) on a switch
a) switchport trunk native vlan 200
Netmasters class goes over native vlans very well. It's a good primer..
http://www.netmasterclass.net/site/libpdf.php
Irfan Siddiqui wrote:
> Wonder if someone can advise...
>
> What is the benefit of using a native vlan on a trunk. If you don't
> define a native vlan on a trunk, I believe it uses vlan 1 as the native
> vlan to pass the untag management traffic..
>
> If you do define a native vlan, it will use that vlan to pass all the
> untagged traffic... and you need to match it on both ends...
>
> Also I believe there is a command to the effect that you can configure
> native vlan to send tagged traffic as well.. dot1q tag native or
> something....
>
>
> But what is the benefit of configuring a native vlan vs . not
> configuring one at all..
>
> Does it have any other benefit, besides specifying what vlan to send
> untagged traffic ?
>
> Please help. Thanks in advance..
>
>
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