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Webcast-Catalyst9k
New Member

Native Vlan Usage

I have several vlans on 2950 switches. Each vlan is monitered seperatly and the data on the vlans must never mix. Should I move the native vlan off vlan 1 and set it to match the individual vlan numbers? Or maby I just don't understand the function of the native vlan.

3 REPLIES
Cisco Employee

Re: Native Vlan Usage

The native vlan is the vlan on an 802.1q trunk that isn't tagged with an 802.1q header. And that's all there really is to it.

Generally, most administrators use the same native vlan for the sake of consistency. Some tag the management vlan as the native vlan, while others will set an unused vlan as the native vlan. It's mostly a matter of procedure, policy, and personal preference.

HTH,

Bobby

*Please rate helpful posts.

New Member

Re: Native Vlan Usage

Thank you for the info.

My main concern is data crossing from one vlan to another. If vlan 1 goes everywhere by default

how can I be positive nothing will cross on vlan 1. I believe I read that untagged packets will be sent on vlan 1. I really need x number of seperate networks sharing a switch, but they must be absoutly seperate. I'm not parinoid but my boss is.

Thanks,

Russ

Purple

Re: Native Vlan Usage

Just don't use vlan 1 for any kind of data traffic .

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