If_bridge and MST

Tom Judge tom at tomjudge.com
Mon Sep 3 13:46:44 PDT 2007

Andrew Thompson wrote:
> On Mon, Sep 03, 2007 at 02:11:59PM +0100, Tom Judge wrote:
>> Hi,
>> I was wondering if if_bridge had been taught how to speak multiple 
>> instance spanning tree?
> Not yet. I havnt started it yet and I do not know of anyone else working
> on it.
> Andrew

While playing with if_bridge today and a pair of Dell PowerConnect 
5324's (with the recent upgrade to MSTP) I noticed that it did not seem 
to be possible to enable STP on if_vlan bridge members.  This would seem 
to be correct as transmitting STP frames tagged with VLAN_ID would seem 
to break the spec and fall into the realm of cisco PVST.  However should 
if_bridge be taught that the vlandev should be used for collection and 
transmission spanning tree in this scenario or should if_vlan be taught 
to copy untagged [R]STP frames onto the vlan interface?


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