What's really the funtion of the Native VLAN?

Answered Question
May 18th, 2010
User Badges:

Greetings


I have a confusion... whats really the function of the native vlan? is it the same that trunk?.. if we have configure the trunk interface and not the native vlan, what happen with the native vlan?

Correct Answer by Federico Coto F... about 7 years 1 month ago

Jose,


Native VLAN is a concept of 802.1q
802.1q is a trunking protocol
They are not the same.
Trunking is the capability to transport multiple VLANs in the same media
Native VLAN is the VLAN that goes untagged across the trunk.
By default if you don't configure a native VLAN, is VLAN 1


Federico.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (5 ratings)
Loading.
Correct Answer
Federico Coto F... Tue, 05/18/2010 - 16:38
User Badges:
  • Green, 3000 points or more

Jose,


Native VLAN is a concept of 802.1q
802.1q is a trunking protocol
They are not the same.
Trunking is the capability to transport multiple VLANs in the same media
Native VLAN is the VLAN that goes untagged across the trunk.
By default if you don't configure a native VLAN, is VLAN 1


Federico.

Ganesh Hariharan Tue, 05/18/2010 - 21:53
User Badges:
  • Purple, 4500 points or more
  • Community Spotlight Award,

    Member's Choice, February 2016

Greetings


I have a confusion... whats really the function of the native vlan? is it the same that trunk?.. if we have configure the trunk interface and not the native vlan, what happen with the native vlan?


In addition to Federico Coto Fajardo post


The Native vlan is an IEEE decision that enabled dot1q to have backwards compatibility with other switches that did not carry or understand vlan tagged traffic.Native vlan is that vlan in which tagging is not performed and all the management information is sent by native vlan like CDP,VTP.


Native VLAN is the VLAN that is same on 2 or more switches. any traffic not labeled with VLAN is by default assigned to NATIVE VLAN. as we know that over 2 Switches that are connected to eachother, all traffic must be VLAN Tagged, untagged traffic is by default assigned to NATIVE VLAN.


Hope to Help !!


Ganesh.H

Ganesh Hariharan Tue, 05/18/2010 - 23:27
User Badges:
  • Purple, 4500 points or more
  • Community Spotlight Award,

    Member's Choice, February 2016

Jose


Attached is a doc i have recently been working on which tries to explain what the native vlan is and why we have it. Hope it helps to answer your questions.


Jon



Hi Jon,


Attachment is missing


Ganesh.H

Jon Marshall Tue, 05/18/2010 - 23:30
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

ganeshh.iyer wrote:


Jose


Attached is a doc i have recently been working on which tries to explain what the native vlan is and why we have it. Hope it helps to answer your questions.


Jon



Hi Jon,


Attachment is missing


Ganesh.H


Hi Ganesh


I know, it's done using Openoffice on Linux and it won't let me upload that format so i have converted it to text which to be honest doesn't look that good


I'll see if i can save it as a format that can be uploaded.


Okay, i've saved it as a Microsoft 2007 .doc but i have no idea how it is going to look.


Jon

Attachment: 
Jon Marshall Tue, 05/18/2010 - 23:24
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Jose


Attached is a doc i have recently been working on which tries to explain what the native vlan is and why we have it. Hope it helps to answer your questions.


Jon

Attachment: 
Ganesh Hariharan Tue, 05/18/2010 - 23:32
User Badges:
  • Purple, 4500 points or more
  • Community Spotlight Award,

    Member's Choice, February 2016

ganeshh.iyer wrote:


Jose


Attached is a doc i have recently been working on which tries to explain what the native vlan is and why we have it. Hope it helps to answer your questions.


Jon



Hi Jon,


Attachment is missing


Ganesh.H


Hi Ganesh


I know, it's done using Openoffice on Linux and it won't let me upload that format so i have converted it to text which to be honest doesn't look that good


I'll see if i can save it as a format that can be uploaded.


Jon


I will be eager to see the document because as that will clear more concepts on native vlan if possible can you mail me on my personal id


Ganesh.H

Jon Marshall Tue, 05/18/2010 - 23:40
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Ganesh


See if you can read the latest .doc version. If not i can e-mail it you although i'll need your e-mail address. Note the doc is not complete as i was going to do a bit of testing with my switches and perhaps some packet captures but i haven't got round to that yet.


Jon

Ganesh Hariharan Wed, 05/19/2010 - 00:04
User Badges:
  • Purple, 4500 points or more
  • Community Spotlight Award,

    Member's Choice, February 2016

Ganesh


See if you can read the latest .doc version. If not i can e-mail it you although i'll need your e-mail address. Note the doc is not complete as i was going to do a bit of testing with my switches and perhaps some packet captures but i haven't got round to that yet.


Jon



I can able to read the doc format Great Work Jon   !! 5 points from my side ...  strange man i can't able to vote the post ..


Ganesh.H

Leo Laohoo Wed, 05/19/2010 - 01:03
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    The Hall of Fame designation is a lifetime achievement award based on significant overall achievements in the community. 

  • Cisco Designated VIP,

    2017 LAN, Wireless


strange man i can't able to vote the post

I think Jon's hit the limit on the CSC score.  He he he ...
Jon Marshall Wed, 05/19/2010 - 00:07
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Ganesh


Thanks for checking it out. Is there anything missing that you can see ?


Jon

Ganesh Hariharan Wed, 05/19/2010 - 00:10
User Badges:
  • Purple, 4500 points or more
  • Community Spotlight Award,

    Member's Choice, February 2016

Ganesh


Thanks for checking it out. Is there anything missing that you can see ?


Jon



Jon,


Let me share my feedback on the document by evening,If possible can you share your e-id.


Ganesh.H

Jon Marshall Wed, 05/19/2010 - 00:12
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

Ganesh


I'll send you a private message with e-mail details.


Jon

Actions

This Discussion

Related Content