[VLAN] Problem Linux + Cisco 3500 XL

[Jon Peatfield]

On Thu, 15 Feb 2007, Peter Stuge wrote:

> On Wed, Feb 14, 2007 at 11:07:25PM +0000, Duarte Lázaro wrote:
>> the problem is that i can´t communicated while trieing VLan 1 .
>
> Cicso always uses VLAN 1 as the default VLAN. VLAN 1 always carries
> any untagged traffic that arrives on tagged trunks.
>
> Change VLAN id from 1 to 2 and it should work.

Cisco certainly defaults to carrying vlan-1 without tagging, though it is 
optional which vlan is carried untagged, we use configs like:

!
interface FastEthernet0/14
  switchport trunk encapsulation dot1q
  switchport trunk native vlan 500
  switchport trunk allowed vlan 1,500-516,1002-1005
  switchport mode trunk
  spanning-tree portfast
!

where we don't actually use vlan 500 to avoid the issue -- that is for a 
C3548 as it happens, the syntax is slightly different on newer versions of 
the software.

  -- Jon