[rbridge] Fwd: DISCUSS and COMMENT: draft-ietf-trill-rbridge-protocol

[Donald Eastlake]

Hi,

I've received a comment that MRD (multicast router discovery) is actually
specified in RFC 4286. Also, the "MUST announce" should depend on whether an
RBridge is actually doing IPv6 multicast optimization, not just on whether
the RBridge has implemented it. Incorporating these changes, the text would
read:

"RBridges do not need to announce themselves as listeners to the IPv4
All-Snoopers multicast group (the group used for MRD reports [RFC4286]),
because the IPv4 multicast address for that group is in the range where all
frames sent to that IP multicast addresses must be broadcast (see [RFC4541],
Section 2.1.2). However, RBridges that are performing IPv6 derived multicast
optimization MUST announce themselves as listeners to the IPv6 All-Snoopers
multicast group."

Thanks,
Donald
=============================
Donald E. Eastlake 3rd   +1-508-634-2066 (home)
155 Beaver Street
Milford, MA 01757 USA
d3e3e3 at gmail.com


On Wed, Jan 20, 2010 at 4:00 PM, Donald Eastlake <d3e3e3 at gmail.com> wrote:

> Sorry for a couple of typos fixed below...
>
> On Wed, Jan 20, 2010 at 3:22 PM, Donald Eastlake <d3e3e3 at gmail.com> wrote:
>
>> See below,
>>
>> On Wed, Jan 20, 2010 at 2:10 PM, Erik Nordmark <erik.nordmark at sun.com>wrote:
>>>
>>> -------- Original Message --------
>>> Subject: DISCUSS and COMMENT: draft-ietf-trill-rbridge-protocol
>>> Date: Wed, 20 Jan 2010 00:24:05 -0800 (PST)
>>> From: Pasi Eronen <pasi.eronen at nokia.com>
>>> To: iesg at ietf.org
>>> CC: trill-chairs at tools.ietf.org,
>>> draft-ietf-trill-rbridge-protocol at tools.ietf.org
>>>
>>> Discuss:
>>> I have reviewed draft-ietf-trill-rbridge-protocol-14, and have one
>>> questions that I'd like to discuss before recommending approval of
>>> the document:
>>>
>>> Section 4.7 says "RBridges do not need to announce themselves as
>>> listeners to the All-Snoopers multicast group (the group used for MRD
>>> reports [RFC4541]), because the IP multicast address for that group is
>>> in the range where all frames sent to that IP multicast addresses must
>>> be broadcast."
>>>
>>> Isn't this true only for IPv4, but not IPv6? (RFC 4541 seems to
>>> broadcast 224.0.0.106, but not FF02::6A)
>>>
>>
>>
>> I've looked at the relevant RFCs and I believe Pasi is correct. It should
>> say something like
>>
>> "RBridges does not need to announce themselves as listeners to the IPv4
>> All-Snoopers multicast
>>
>
> does -> do
>
>
>>  group (the group used for MRD reports [RFC4541]), because the IPv4
>> multicast address for that group is in the range where all frames sent to
>> that IP multicast addresses must be broadcast. However, RBridges the
>> implement IPv6 derived multicast optimization MUST announce
>>
>
> the -> that
>
>
>> themselves as listeners to the IPv6 All-Snoopers multicast group."
>>
>> Does any have a problem with that wording?
>>
>>
>>> Comment:
>>> I found the document surprisingly well-written and easy to
>>> understand (despite the complex topic).
>>>
>>
>> Thanks,
>> Donald
>> =============================
>> Donald E. Eastlake 3rd   +1-508-634-2066 (home)
>> 155 Beaver Street
>> Milford, MA 01757 USA
>> d3e3e3 at gmail.com
>>
>
> Thanks,
> Donald
>
>
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