Re: [Idr] [GROW] Question about BGP Large Communities

Robert Raszuk <robert@raszuk.net> Wed, 05 February 2020 09:01 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Wed, 05 Feb 2020 10:01:37 +0100
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To: Brian Dickson <brian.peter.dickson@gmail.com>
Cc: "Dongjie (Jimmy)" <jie.dong@huawei.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "grow-chairs@ietf.org" <grow-chairs@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "grow@ietf.org" <grow@ietf.org>
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Subject: Re: [Idr] [GROW] Question about BGP Large Communities
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Just to clarify one subtle point.

In wide communities types are either operator assigned or IANA driven - no
new code from vendor is required in contrast to extended community. That
along with variable length is what makes wide communities universal.

Sure that some vendors or individuals are scared about policy aspect of
wide communities processing - but implementing policy handling any
arbitrary types (irrespective of IANA or local assignment) is optional.

- - -

To the topic of using Large Communities - I do recommend whichever encoding
is chosen to always be able to insert and carry originator's ASN. All zeros
are meaningless read: anonymous.

Thx,
R.


On Wed, Feb 5, 2020 at 2:45 AM Brian Dickson <brian.peter.dickson@gmail.com>
wrote:

> Disagree, we want something deployed (large) and deployable (requiring
> only IANA action, no vendor activity) immediately.
> IMHO, any special handling or new code points or upgrades are non-starters.
> This particularly applies to wide and extended
> Brian
>
> On Tue, Feb 4, 2020 at 5:41 PM Dongjie (Jimmy) <jie.dong@huawei.com>
> wrote:
>
>> Agree that for this case it may be more convenient to just use extended
>> community with a new type, this could avoid any possible collision with
>> existing deployments, and save the effort of assigning a set of ASNs. Wide
>> community may be too powerful for this:)
>>
>>
>>
>> Best regards,
>>
>> Jie
>>
>