Native - Vlan

Unanswered Question
Aug 25th, 2009
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Hi everybody,

i was reading the CCNA Security Self study guide written by Kevin WALLACE and Michael WATKINS and just came across this :

Native VLAN is configured on an interface context


Int gig 0/1

Switchport trunk native Vlan 400.


I was thinking that it will be configured in the global configuration mode, because that VLAN is not only for users who can reach (vlan pruning, or else) that interface. But it is a management VLAN, isn't it ?

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Brandon Buffin Tue, 08/25/2009 - 04:13
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VLANs are configured globally, but are assigned to particular ports. In this example, the native VLAN assigned to a trunk port is the VLAN that will be assigned to untagged packets(no VLAN) arriving on this interface.


Hope this helps.


Brandon

farellfolly Tue, 08/25/2009 - 04:55
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A bit.

But do you need to configure the native VLANs (if they are many) on each trunk port ?


Does this action deactivate default VLAN 1 ou you do it manually ?

Brandon Buffin Tue, 08/25/2009 - 05:00
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You would need to configure a native VLAN on each trunk port. There will only be one native VLAN per port. This simply tells the device how to handle packets that come in with no VLAN tag. This does not deactivate any other VLAN that you have configured. A trunk, by nature, is capable of passing traffic from multiple VLANs.


Brandon

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