[rbridge] Consensus Check: Announcing Root

[Eastlake III Donald-LDE008]

I'm fine with option (b) but it seems implausible that all 0's could
ever be a normal MAC address. Among other things, the 00-00-00 OUI is
reserved for expressing arbitrary EtherTypes in the SNAP SAP format...

Donald

-----Original Message-----
From: Anoop Ghanwani [mailto:anoop at brocade.com] 
Sent: Monday, October 08, 2007 10:56 AM
To: Radia.Perlman at sun.com; Eastlake III Donald-LDE008
Cc: Rbridge at postel.org
Subject: RE: [rbridge] Consensus Check: Announcing Root

I would prefer (a) or (b) since 0 is technically
a valid address.  (b) seems best since it's explicit.

Anoop 

> -----Original Message-----
> From: rbridge-bounces at postel.org 
> [mailto:rbridge-bounces at postel.org] On Behalf Of Radia.Perlman at sun.com
> Sent: Sunday, October 07, 2007 8:38 PM
> To: Eastlake III Donald-LDE008
> Cc: Rbridge at postel.org
> Subject: Re: [rbridge] Consensus Check: Announcing Root
> 
> Good point. There might be no bridges. So there has to be a 
> way of encoding that. Anything such as:
> a) leaving out the TLV in which one announces the root bridge
> b) using a flag to say "no root"
> c) using a special address, say 0
> or I'm sure there are lots of possibilities.
> 
> Radia
> 
> ----- Original Message -----
> From: Eastlake III Donald-LDE008 <Donald.Eastlake at motorola.com>
> Date: Saturday, October 6, 2007 12:46 pm
> Subject: [rbridge] Consensus Check: Announcing Root
> 
> > This is a check via the mailing list on a slight modification of an 
> > apparent consensus from the minutes of the Chicago meeting for a 
> > changefrom protocol draft -05. The tentative consensus at 
> the Chicago 
> > meeting
> > was:
> > 
> >   It is mandatory for an RBridge to announce the bridge root that
> >   it sees out each physical port.
> > 
> > Based on mailing list discussion, I would like to tweak this as
> > follows:
> >   An Rbridge MUST parse BPDUs it receives on a port and announce
> >   in the core IS-IS instance the bridge root that it sees out
> >   each port. For MSTP (Multiple Spanning Tree Protocol), this is
> >   the CIST (Common and Internal Spanning Tree) root.
> > 
> > I have a question in connection with this. What is 
> announced for the 
> > port if no BPDU has been received recently or ever? Should 
> there be a 
> > "root MAC address valid" flag per port or should there some 
> > conventionalvalue, like zero, which is announced?
> > 
> > Thanks,
> > Donald
> > 
> > _______________________________________________
> > rbridge mailing list
> > rbridge at postel.org
> > http://mailman.postel.org/mailman/listinfo/rbridge
> > 
> 
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