[rbridge] RBridge: a case of study

[Eastlake III Donald-LDE008]

Hi,

Yes, as noted in protocol draft -05, the pseudo code was unchanged from
-04 and is out of date.

As currently being discussed, the TRILL encapsulated data being
forwarded out a particular physical port would all have the same Outer
VLAN ID.

Thanks,
Donald

-----Original Message-----
From: rbridge-bounces at postel.org [mailto:rbridge-bounces at postel.org] On
Behalf Of Zhi-Hern Loh
Sent: Tuesday, October 30, 2007 10:54 PM
To: Anoop Ghanwani
Cc: Developing a hybrid router/bridge.; Radia Perlman; James Carlson
Subject: Re: [rbridge] RBridge: a case of study


----- "Anoop Ghanwani" <anoop at brocade.com> wrote:
> > -----Original Message-----
> > From: rbridge-bounces at postel.org 
> > [mailto:rbridge-bounces at postel.org] On Behalf Of James Carlson
> > Sent: Tuesday, October 30, 2007 2:37 PM
> > To: Silvano Gai
> > Cc: Developing a hybrid router/bridge.; Radia.Perlman at Sun.COM
> > Subject: Re: [rbridge] RBridge: a case of study
> > 
> > Silvano Gai writes:
> > > Radia,
> > > 
> > > I have added few slides to the example and I suggest that 
> > we use it as 
> > > a possible case of study for TRILL (of course, not the only one).
> > > 
> > > Let's see if the solutions we have discussed work on this
> example.
> > > 
> > > The complete case of study is at:
> > > 
> > > http://www.ip6.com/acme-example-v1.ppt
> > 
> > I have a few narrow questions that I think might help me 
> > understand this picture a bit better.  (I probably have more 
> > questions once I know the narrow answers.  ;-})
> 
> Let me take a shot at answering these.
> 
> >   1.  After the proposed fix, should VLAN 3 on Cloud L be bridged
> >       together with VLAN 3 on Cloud R, even though the backbone
> itself
> >       doesn't directly carry VLAN 3?  (I.e., are TRILL packets with
> >       outer VLAN ID 7 or 8 and with inner VLAN 3 present on the
> >       backbone?)
> 
> Yes, that's pretty much what ends up happening.  
> We have effectively extended the bridged LAN.
> 

Anoop, I'm reading the RBridge protocol specification version 5 and it
seems to me that your comment is inconsistent with the spec. In section,
5.2.2.3, the spec says that the outer VLAN tag of TRILL data frames has
the same VID as the inner tag. Is this section going to be changed?

Futhermore, if we were to use different VIDs on outer VLAN tags then we
would need to handle the multi-destination case where one would need to
send a multi-destination frame per outer VID to communicate with the RBs
in the distribution tree which are using different VIDs. Is this
correct?

Thanks,
Hern
Fulcrum Microsystems

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