[rbridge] suggested minor tweak to align TRILL documents

[Donald Eastlake]

The suggested change in protocol specification text seems reasonable. I also
prefer the first of the two options given for changed text. Does anyone
object?
Thanks,
Donald

On Thu, Feb 19, 2009 at 3:01 PM, James Carlson <james.d.carlson at sun.com>wrote:

> I-D protocol-11 says this on page 35:
>
>   6. If the sender is DRB, the Rbridges (including itself) that it
>      appoints as forwarders for that link and the VLANs for which it
>      appoints them.
>
> Note the "including itself" phrase, which indicates that the list must
> be explicit.  I-D isis-02 says this:
>
>      An RBridge's nickname may occur as appointed forwarder for
>      multiple VLAN ranges within the same or different Port Capability
>      TLVs within a DRB's Hello. In the absence of appointed forwarder
>      subTLVs referring to a VLAN, the DRB acts as the appointed
>      forwarder for that VLAN if end station service is enabled.
>
> Note the "in the absence of" clause.  This latter spec would allow a
> sender to omit any cases where the AF is the DRB, potentially omitting
> the option entirely if all AFs are the DRB.  This seems a lot more
> reasonable to me than the -11 language, which requires a "dummy"
> option for the most obvious case.
>
> This is especially so, as there's really nothing useful that anyone
> else listening to this message could garner from hearing the DRB
> appoint itself as AF.  Those other (non-designated) RBs need to hear
> if they're being tapped as AF, but they don't need to do anything if
> the DRB is AF.
>
> Any chance we can update the protocol-11 language to conform to the
> isis-02 text?  Suggestions would be either:
>
>   6. If the sender is DRB, the Rbridges (excluding itself) that it
>
> or:
>
>   6. If the sender is DRB, the Rbridges that it appoints as
>      forwarders for that link and the VLANs for which it appoints
>      them.  Where the appointed forwarder is the DRB, the VLANs need
>      not be listed explicitly.
>
> (I like the former better, as it makes the expected result more
> obvious, but the latter works, too.)
>
> --
> James Carlson, Solaris Networking              <james.d.carlson at sun.com>
> Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
> MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677
> _______________________________________________
> rbridge mailing list
> rbridge at postel.org
> http://mailman.postel.org/mailman/listinfo/rbridge
>



-- 
=============================
Donald E. Eastlake 3rd   +1-508-634-2066 (home)
155 Beaver Street
Milford, MA 01757 USA
d3e3e3 at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.postel.org/pipermail/rbridge/attachments/20090223/c1c9235f/attachment.html