[c-nsp] BPDU

[Phil Mayers]

On 10/18/2010 03:11 PM, jack daniels wrote:
> Hi Group,
>
> Please suggest -
>
> does BPDU of RPVST goes as a payload in vlan ?

Yes. The PDU *also* contains the vlan tag embedded in a header field 
(bridge ID IIRC) which allows the two ends to detect a vlan mismatch.

>
> how the BPDU for all vlans in a instance go ?

PVST doesn't have "instances". Each VLAN sends its own BPDUs.