[rbridge] Consensus Check: Hellos

[Anoop Ghanwani]

I had a problem with the general wording and 
had sent an email to the list about this a 
while back.

While I think it's OK to have the designated
forwarder send hellos on all VLANs, I would
prefer it be worded such that:

(a) We clearly state that the intent for this
is to detect connectivity issues.  In other
words, this will not be used for forming 
adjacencies (and there we will have something
in the hello that distinguishes it from the
hellos that are actually used to form adjacencies).

(b) That this behavior is optional because there
are other ways to detect connectivity issues
such as 802.1ag.  There is also the L2 Gateway
Protocol defined in 802.1ah that we can look into.
As such, I prefer that the default be to _not_ 
send such messages unless explicitly configured
to do so.

Anoop 

> -----Original Message-----
> From: rbridge-bounces at postel.org 
> [mailto:rbridge-bounces at postel.org] On Behalf Of Eastlake III 
> Donald-LDE008
> Sent: Tuesday, April 15, 2008 10:16 PM
> To: Rbridge at postel.org
> Subject: [rbridge] Consensus Check: Hellos
> 
> This is the last of the consensus checks via the mailing list 
> to confirm or refute an apparent consensus at the 
> Philadelphia meeting.
> 
> 
> ******* The VLANs on which an Rbridge sends TRILL IS-IS 
> Hellos is expanded to include those for which it is an 
> appointed forwarder except to the extent that it is 
> configured not to send these additional Hellos.
> 
> 
> If no particular controversy arises over this in the next two 
> weeks, we will declare it to be the working group consensus.
> 
> Thanks,
> Donald & Erik
> 
> PS: There was not complete agreement on this although there 
> did appear to be a rough consensus at the meeting. However, 
> in light of the other consensus from that meeting to no 
> longer require the "decapsulation check" (see
> http://www.postel.org/pipermail/rbridge/2008-April/002939.html
) and the discussions of the trade-offs, perhaps the consensus > should
be that, by default, Rbridges MUST either (1) send 
> these additional Hellos if they are an appointed forwarder or 
> (2) perform the decapsulation check.
> 
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