[rbridge] MUST not send spanning tree BPDUs?
sgai at nuovasystems.com
Mon Dec 1 07:59:57 PST 2008
From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] On
Behalf Of Radia Perlman
Sent: Friday, November 28, 2008 9:37 PM
To: Donald Eastlake
Cc: rbridge at postel.org
Subject: Re: [rbridge] MUST not send spanning tree BPDUs?
Yeah. I think we should either drop the sentence, or say "MAY generate
but MUST NOT forward BPDUs from
one link to another".
Donald Eastlake wrote:
> Hi Radia,
> See below...
> On Fri, Nov 28, 2008 at 6:31 PM, Radia Perlman <Radia.Perlman at sun.com>
>> The spec currently says (in section 188.8.131.52 Transmission of BPDUs)
>> RBridges MAY support a capability for sending spanning tree BPDUs
>> the purpose of attempting to force a bridged LAN to partition as
>> discussed in Section A.3.3. Except for this optional capability,
>> RBridges MUST NOT send spanning tree BPDUs.
>> I don't remember any discussion on saying that RBridges MUST NOT send
>> BPDUs. I remember
>> at one point requiring it, and saying that an RBridge is DRB if and
>> if it is the Spanning tree Root.
>> (I still would prefer that, by the way -- makes all the controversial
>> per VLAN Hellos
>> I remember it being removed from the spec (because of complexity with
>> versions of
>> spanning tree, and links with no bridges, perhaps, where the spanning
>> tree messages would
>> be unnecessary overhead), but I don't remember any reason to say
>> RBridges MUST NOT sent
> I suspect it used to say "do not" in the sense that there is no
> RBridge reason for an RBridge port to send spanning tree BPDUs except
> for the optional bridge LAN partitioning feature described in Section
> A.3.3. In some pass to upgrade to IETF implementation key words, it
> probably got changed when it didn't necessarily need to be. The only
> problem I can see with dropping this is that it might marginally
> increase the chance someone would erroneously try to build spanning
> trees through an RBridge.
>> Anyone else remember?
>> rbridge mailing list
>> rbridge at postel.org
> Donald E. Eastlake 3rd +1-508-634-2066 (home)
> 155 Beaver Street
> Milford, MA 01757 USA
> d3e3e3 at gmail.com
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