[c-nsp] vlan tagging question

[Brad Henshaw]

Chad Whitten wrote: 

> I have a non-cisco access device connecting to a cisco 3750 via gigE.
> The 3750 interface is set for 802.1q trunking with two vlans - 100 and
> 201.  Vlan 201 is the native vlan on the cisco interface.  Should the
> access device be tagging packets on vlan 201 or leaving them untagged?

It should be leaving VLAN 201 packets untagged unless you've set
'vlan dot1q tag native' on the 3750.

We avoid using the native VLAN for customer traffic and also tag
everything, everywhere in order to avoid accidental propagation of
BPDUs or other L2 control protocols to places they don't belong.

Regards,
Brad