[rbridge] RBridge: a case of study
Dinesh G Dutt
ddutt at cisco.com
Tue Oct 30 20:57:02 PDT 2007
The spec is a trifle out of date and will be fixed once we all agree on
some of the outstanding issues,
Zhi-Hern Loh wrote:
> ----- "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:
>>>> 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
>>>> The complete case of study is at:
>>> 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
>>> 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
>> 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, 220.127.116.11, 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?
> Fulcrum Microsystems
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the depth of our answers. - Carl Sagan
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