[j-nsp] vlan tagging

[Nicolas Fevrier]

Daniel Roesen wrote:

>On Wed, Feb 05, 2003 at 03:47:55AM -0500, German Martinez wrote:
>  
>
>>While working on an interconnection of a Juniper with a Catalyst 6500
>>using an 802.1q trunk, we encountered compatibility problems. Every time
>>we enable vlan-tagging on the Juniper box, we loose reachability to the
>>Cat switch.
>>    
>>
>
>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
catOS(enable)> set dot1q-all-tagged enable.

Nicolas.