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Re: [Idr] community of the day - common header

"Bertrand Duvivier (bduvivie)" <bduvivie@cisco.com> Thu, 22 September 2016 07:29 UTC

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From: "Bertrand Duvivier (bduvivie)" <bduvivie@cisco.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] community of the day - common header
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Date: Thu, 22 Sep 2016 07:29:02 +0000
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References: <20160908214031.GA23544@pfrc.org> <20160908231840.GB16775@puck.nether.net> <20160909153317.GC8370@pfrc.org> <8C072797-55A7-4D1A-87E4-67551953EF22@puck.nether.net> <20160909155952.GE8370@pfrc.org> <20160909164640.GE79185@Space.Net> <20160909170513.GE12105@pfrc.org> <20160909171110.GF79185@Space.Net> <alpine.DEB.2.02.1609141250080.1477@uplift.swm.pp.se> <m27faedp12.wl-randy@psg.com> <4166dc4d49e944cba2ddfad3896cf8e9@XCH-ALN-014.cisco.com>
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Subject: Re: [Idr] community of the day - common header
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+1 
Keep it as simple as possible

Bertrand
Best Regards Bertrand Duvivier
https://wiki.cisco.com/display/SLA/Segment%20Routing







On 22/09/16 03:58, "Jakob Heitz (jheitz)" <jheitz@cisco.com> wrote:

>https://tools.ietf.org/html/draft-heitz-idr-large-community-04
>as approved by the WG for adoption does not share a common header
>with any other BGP attribute. Judging from emails to the list,
>there is widespread support for keeping it that way.
>
>The first 7 attributes were added to BGP by RFC 1654 in 1994.
>2 are reserved. 24 attributes have been added in the 22 years since.
>There are 223 attribute codes left. At that rate we will run out in
>over 200 years. And then we can define a common header under which
>to define another 200 years of attributes.
>
>I understand that there have been 3 "incidents" in the past,
>caused by BGP bugs regarding attribute handling:
> o Corruption of unknown attributes,
> o Attr 128 ATTR_SET handling,
> o leak of confed ASN in AS4-PATH.
>This has lead to many ASes filtering all unrecognized or unnecessary
>BGP attributes.
>RFC7606 will now prevent session resets under these and similar
>conditions.
>
>If we define a header today under which to group a set of new
>BGP attributes, then if there is a bug in just one of them,
>then ASes will filter the common header, thus filtering every
>attribute under it.
>
>I think large communities should be a BGP attribute not under
>another header.
>
>Thanks,
>Jakob.
>
>
>> -----Original Message-----
>> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Randy Bush
>> Sent: Wednesday, September 14, 2016 4:45 PM
>> To: Mikael Abrahamsson <swmike@swm.pp.se>
>> Cc: idr@ietf.org
>> Subject: Re: [Idr] community of the day - common header
>> 
>> > Since we don't have that, then now is the time to standardize a "does
>> > the same as we have today for 16bitAS but for 32bitAS" which involves
>> > as small code, operational and standardization changes as possible, so
>> > code can get into operator routers ASAP.
>> >
>> > So get it out the door now. Not in 6-12 months time. Now. ASAP.
>> 
>> yes!
>> 
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>
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