[j-nsp] vlan tagging

[Antonio Querubin]

On Wed, 5 Feb 2003, Nicolas Fevrier wrote:

> >Cisco sends frames in the "native" VLAN (by default being VLAN 1)
> >untagged, Juniper doesn't have this concept and expects all frames to
> >be tagged. You are most probably experiencing the result of this
> >discrepancy in some way. I guess you are running the 6500 in layer 2
> >mode and using sc0 in VLAN 1 as management interface?
> >
> This default behavior can be modified on the cisco :
> NativeIOS(config)# vlan dot1q tag native

Is that feature available only in some IOS versions?  It doesn't exist on
any of the Ciscos we have here.

In either case, one can move the native VLAN to something other than VLAN
1 by creating a dummy ethernet sub-interface and designating it as the
native VLAN.  Then VLAN 1 can be tagged.  For example:

interface Ethernet0/0.1
 encapsulation dot1Q 1

interface Ethernet0/0.4095
 description Dummy interface to grab "native" keyword
 encapsulation dot1Q 4095 native
 shutdown