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[GROW]Re: well known large communities

"Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov> Sat, 08 June 2024 15:54 UTC

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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: Susan Hares <shares@ndzh.com>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [GROW]Re: well known large communities
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Date: Sat, 08 Jun 2024 15:54:17 +0000
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CC: "grow@ietf.org" <grow@ietf.org>, "draft-heitz-idr-wklc@ietf.org" <draft-heitz-idr-wklc@ietf.org>
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Subject: [GROW]Re: well known large communities
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Some of us may remember this (including Sue and Jeff).  Jakob Heitz, I, and others have proposed/presented (in the IDR WG) the idea of a range of IANA-registered 4-octet ASN values for the Global Admin field to classify BGP Well Known Large Communities (WKLC).
See: https://datatracker.ietf.org/doc/draft-heitz-idr-wklc/  [1]

The above draft was motivated in part by the following GROW WG draft's request plus possible other use cases for WKLC:
https://datatracker.ietf.org/doc/draft-ietf-grow-route-leak-detection-mitigation/  [2]

Our idea was critiqued for requesting 64M 4-octet ASN values to be set aside by IANA for WKLC. That is only 64 million out of the 4 Billion (a fraction 0.015) 4-octet ASNs. This can be reduced easily to 256K out of the 4 Billion (a fraction 0.00006) if that is acceptable. There would be 9 octets available in the WKLC for the data part. The 256K number can be further reduced to 1K if desired (with 8 octets available in the WKLC for the data part). 

Details can be found in the above cited draft [1].  We can discuss further the possibilities if this approach gets some traction.  Thanks.

Sriram

===========================
From: Susan Hares <shares@ndzh.com> 
Sent: Friday, June 7, 2024 8:22 PM
To: Jeffrey Haas <jhaas@pfrc.org>; Robert Raszuk <robert@raszuk.net>
Cc: Job Snijders <job=40fastly.com@dmarc.ietf.org>; David Farmer <farmer=40umn.edu@dmarc.ietf.org>; grow@ietf.org
Subject: [GROW]Re: I-D Action: draft-ietf-grow-ixp-ext-comms-00.txt

And, this was because the Large community authors – wanted it as just a number. 

Individuals even said, there would be no use for well-known large BGP communities. 

Sue 

From: Jeffrey Haas <mailto:jhaas@pfrc.org> 
Sent: Friday, June 7, 2024 5:24 PM
To: Robert Raszuk <mailto:robert@raszuk.net>
Cc: Job Snijders <mailto:job=40fastly.com@dmarc.ietf.org>; David Farmer <mailto:farmer=40umn.edu@dmarc.ietf.org>; mailto:grow@ietf.org
Subject: [GROW]Re: I-D Action: draft-ietf-grow-ixp-ext-comms-00.txt

There is no such thing as a well known large bgp community.  

Jeff

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