802.1Q and Native Vlan

Unanswered Question
Apr 20th, 2008
User Badges:

Under normal circumstances, when a untagged frame reaches the end of the trunk link, the frame will be assumed to belong to the native vlan of the trunk link. The 802.1Q tag will be removed and the frame will be forwarded out to those ports in the native vlan.


If a trunk port receives a 802.1Q frame that is tagged with the native vlan tag, what happens to the frame?


Thanks.



  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Jon Marshall Sun, 04/20/2008 - 19:40
User Badges:
  • Super Blue, 32500 points or more
  • Hall of Fame,

    Founding Member

  • Cisco Designated VIP,

    2017 LAN, WAN

The native vlan does not have an 802.1Q tag associated with it ie. it is untagged. So a trunk port won't receive a frame in the native vlan with a tag on it because by definition the native vlan doesn't have a tag.


Jon

bvsnarayana03 Sun, 04/20/2008 - 22:09
User Badges:
  • Silver, 250 points or more

frames from native vlans are always untagged.so there's no chance of recvng a frame with tag.

Actions

This Discussion