cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
918
Views
0
Helpful
2
Replies

Vlan 0,Cisco Switches and Cisco Ip Phones

aalejo
Level 5
Level 5

According to Cisco papers this command:

"switchport voice vlan dot1p"

is used to instrucy IP Phone to send voice voice traffic on vlan 0 (with dot1q tagging and vlan Id=0). But Cisco switches does not allow "vlan 0" on any configuration commad.

Why?

2 Replies 2

milan.kulik
Level 10
Level 10

Hi,

"The telephone uses priority tagging and uses VLAN 0 (the native VLAN). "

See http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/12120ea2/2950cr/cli2.htm#wp3058830

I remember I've read somwhere Cisco switches should be able to receive both untagged and tagged frames for native VLAN.

So my understandig is Cisco switch should accept both frame untagged, tagged with the native VLAN ID and tagged with VLAN ID = 0 and forward all these frames to native VLAN.

Regards,

Milan

Sr:

But you can not create vlan 0 on Cisco Switches an the native Vlan is vlan 1 by default (on any 802.1Q port) in Cisco Switches.

You can not also configure vlan 0 as the native vlan on 802.1Q port.

Regards

Alex

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: