Thanks for comments Thomas, agreed. Cheers, Jeff
> On Mar 11, 2021, at 22:33, Jakob Heitz (jheitz) <[email protected]> wrote: > > Thanks Thomas. > I agree to remove the netflow reference. > > Regards, > Jakob. > > -----Original Message----- > From: [email protected] <[email protected]> > Sent: Sunday, March 7, 2021 10:20 PM > To: [email protected]; [email protected]; > [email protected]; [email protected]; Jakob Heitz (jheitz) > <[email protected]> > Cc: [email protected] > Subject: RE: [GROW] I-D Action: draft-ietf-grow-as-path-prepending-03.txt > > Dear authors, > > Speaking as a network operator, I think your draft has merit and I agree BGP > as-path prepending is misused on the Internet and a best common practice > draft is welcomed. > > I like to comment on section 3.4 > https://tools.ietf.org/html/draft-ietf-grow-as-path-prepending-03#section-3.4 > > You are referring to the impact of BGP as-path length onto IPFIX. > > To my current knowledge, there are only 4 well known IPFIX entities > registered at IANA related to BGP as-path > > https://www.iana.org/assignments/ipfix/ipfix.xhtml > > IE16 bgpSourceAsNumber > IE17 bgpDestinationAsNumber > IE128 bgpNextAdjacentAsNumber > IE129 bgpPrevAdjacentAsNumber > > None of them contain the entire BGP as-path array. Only the first or last BGP > ASN of the path array for source and destination IPv4/6 address of the flow. > > The reason to my knowledge is that for UDP transport, which is one of the > options to export IPFIX and the most supported, does not support > segmentation. Thus limiting IPFIX of the amount data records and values > within a record which can be exposed per message even to a lower value than > RFC 7011 defines with 65535 bytes as maximum message size. > > https://tools.ietf.org/html/rfc7011#section-10 > https://tools.ietf.org/html/rfc7011#section-10.3.3 > > The BGP as-path array could be potentially be exposed with code points from > the private enterprise number space. If that would be the case than same > operational considerations would apply than in RFC 8549 section 7 described > since BGP communities are also array's. > > https://tools.ietf.org/html/rfc8549#section-7 > > Therefore I either recommend to remove the IPFIX/Netflow relevant part from > the draft or clearly state the scenario where with private enterprise number > BGP as-path array is exposed and refer to example implementations as they are > nonstandard. > > Best wishes > Thomas > > -----Original Message----- > From: GROW <[email protected]> On Behalf Of [email protected] > Sent: Tuesday, February 9, 2021 1:30 AM > To: [email protected] > Cc: [email protected] > Subject: [GROW] I-D Action: draft-ietf-grow-as-path-prepending-03.txt > > > A New Internet-Draft is available from the on-line Internet-Drafts > directories. > This draft is a work item of the Global Routing Operations WG of the IETF. > > Title : AS Path Prepending > Authors : Mike McBride > Doug Madory > Jeff Tantsura > Robert Raszuk > Hongwei Li > Jakob Heitz > Filename : draft-ietf-grow-as-path-prepending-03.txt > Pages : 10 > Date : 2021-02-08 > > Abstract: > AS Path Prepending provides a tool to manipulate the BGP AS_Path > attribute through prepending multiple entries of an AS. AS Path > Prepending is used to deprioritize a route or alternate path. By > prepending the local ASN multiple times, ASs can make advertised AS > paths appear artificially longer. Excessive AS Path Prepending has > caused routing issues in the internet. This document provides > guidance,to the internet community, with how best to utilize AS Path > Prepending in order to avoid negatively affecting the internet. > > > The IETF datatracker status page for this draft is: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-grow-as-path-prepending%2F&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978557059%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7TnSGyVp7p7innNedC5FT5ssVVOzrxYVyW6Tw5B0N90%3D&reserved=0 > > There are also htmlized versions available at: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-grow-as-path-prepending-03&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978567016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=2mJb%2B6acbTyMKNdkVy1UdsJQdxnELMqyh52GQkPFgm8%3D&reserved=0 > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-grow-as-path-prepending-03&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978567016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=qIZAlo8WOj85dXLPqQu%2BMq6cILpMdAd%2Ffye2bWYNAac%3D&reserved=0 > > A diff from the previous version is available at: > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-ietf-grow-as-path-prepending-03&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978567016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=mrQUS6ldbZk5CW9UcS5npaE4OZVhFBWIA4J%2Fpzat9FE%3D&reserved=0 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > https://eur03.safelinks.protection.outlook.com/?url=ftp%3A%2F%2Fftp.ietf.org%2Finternet-drafts%2F&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978567016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=uh4ZqEom9mzHg6jws%2B92YRb47qaPnkg5q4G%2Fu2sDm%2BE%3D&reserved=0 > > > _______________________________________________ > GROW mailing list > [email protected] > https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fgrow&data=04%7C01%7CThomas.Graf%40swisscom.com%7C5a0d770557454ff09f2208d8cc91d377%7C364e5b87c1c7420d9beec35d19b557a1%7C1%7C0%7C637484273978567016%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=uEdTSWuNSX%2FnNhgBQwPLLsHVQAV3oq1xYCdDJOXCDSc%3D&reserved=0 _______________________________________________ GROW mailing list [email protected] https://www.ietf.org/mailman/listinfo/grow
