[rbridge] IS-IS per VLAN ?

[Michael Smith (michsmit)]

> -----Original Message-----
> From: rbridge-bounces at postel.org 
> [mailto:rbridge-bounces at postel.org] On Behalf Of Joe Touch> 
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> 
> 
> > michsmit at cisco.com wrote:
> >>>-----Original Message-----
> >>>From: rbridge-bounces at postel.org
> >>>[mailto:rbridge-bounces at postel.org] On Behalf Of Joe Touch
> > ...
> >> I would expect that a set of rbridge nodes could work anywhere a 
> >> single bridge could work, but that the overall total number of 
> >> devices on the
> >> L2 served by the system would not change substantially.
> >> 
> > Does that definition of a "single bridge" include 802.1ah and metro 
> > environments ?
> 
> My personal opinion is 'no', i.e., I consider an rbridge 
> campus to act as a single, conventional bridge.

If we don't consider those environments, I think we may be
under-estimating the size of current L2 deployments.  The line between
service provider and enterprise is very blurry as the enterprise becomes
larger.  I have run into quite a few larger enterprises that have
adopted a model where they provide services to the various
departments/divisions using a large L2 core, essentially becoming an
internal Metro Ethernet provider.  Quite often, those are the
enterprises deploying the more advanced spanning tree technology as they
often see the "shortcomings" first.  

> That's with the caveat that I can't access the 802 specs on 
> the subject ;-(

Sounds like we have something to ask for in a liason statement :-)  They
have given password access to the IETF before (you may just find it if
you look at http://www.ietf.org/proceedings/01aug/51-65.htm )

Michael

> 
> If that bridge is part of an 802.1ah bridge device, then so 
> be it, but there may be more to an 802.1ah bridge than we're 
> thinking for an rbridge campus, at least AFAICT from what I 
> can infer the specs say on the matter.
> 
> Joe
> 
> 
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