Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Mon, 24 October 2016 19:11 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: heasley <heas@shrubbery.net>, Robert Raszuk <robert@raszuk.net>
Thread-Topic: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
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Date: Mon, 24 Oct 2016 19:11:28 +0000
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References: <20161018191521.GT95811@Vurt.local> <9EFC9BAA-F917-4C70-A139-1F69CAECF9C0@pfrc.org> <20161020215938.GE1074@Vurt.local> <adb00bcd7b8e45db857eae7019c646fc@XCH-ALN-014.cisco.com> <ae5da282-201c-f745-9f26-67ce73826bd5@i3d.net> <CA+b+ERkV2PBtzzx=uoygDzvTyJzunROCNX=0Y4phvGdn=oK5Xw@mail.gmail.com> <20161022122735.GC79185@Space.Net> <CA+b+ERkEMuV7yNKMG-EBUruMEC2E1zSd-ouAaGYaeuMwzpv2SQ@mail.gmail.com> <20161024180818.GL86859@shrubbery.net> <CA+b+ERnhWrDGMi=d8Yi9fHzH=J6T-iQ+24MZE8DDvmXadt00Mw@mail.gmail.com> <20161024181924.GN86859@shrubbery.net>
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Cc: IETF IDR WG <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
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This draft provides a 12 byte community.
The meaning of the 12 bytes is to be defined by mutual agreement between the sender and the receiver.
In many cases, a community is confined to within a single AS or between two ASes.
In that case, no further specification from the IETF is necessary.
In the case that a community stays attached to a route while it is propagated to multiple ASes,
we need to specify a little more.
For this case, we recommend that the first 4 bytes contain the ASN that is assigned to the entity that defines the meaning of the other 8 bytes.
In this way, multiple entities can attach communities to the same route without conflict.

There is no source ASN and no target ASN, just the namespace ASN.
I say "entity" and not AS, because an entity that is assigned an ASN does not necessarily use the ASN to construct an AS.


Thanks,
Jakob.


> -----Original Message-----
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of heasley
> Sent: Monday, October 24, 2016 11:19 AM
> To: Robert Raszuk <robert@raszuk.net>
> Cc: heasley <heas@shrubbery.net>; IETF IDR WG <idr@ietf.org>; Susan Hares <shares@ndzh.com>
> Subject: Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
> 
> Mon, Oct 24, 2016 at 08:17:48PM +0200, Robert Raszuk:
> > You still could do that.
> >
> > You overload last octet with exact action you need just like you do today
> > with 1997.
> 
> Please review the threads associated with -large- to re-discover why that
> is not acceptable.
> 
> > Three sets of 4 octets with no semantics still requires curret way to
> > advertise what action given community means at any target ASN.
> >
> > Best,
> > R
> >
> > Ps. Besides adding 4 more octets to leave current LC as is just to be able
> > to avoid anonymous injections seems to me like very little price as
> > compared with befit. But I guess am alone with that point of view here.
> >
> > On Oct 24, 2016 2:08 PM, "heasley" <heas@shrubbery.net> wrote:
> >
> > > Sat, Oct 22, 2016 at 03:53:05PM +0200, Robert Raszuk:
> > > > You are mixing SRC_ASN with TARGET_ASN in the same field.
> > >
> > > I want to point-out that by forcing the first field to be "src_asn" as
> > > you are suggesting, would make one intended use of -large- not possible,
> > > for ASN1 to tell ASN2 to do something with a route as it applies to ASN3.
> > > eg: ASN2:ASN3:action, ie: apply "action" (such as prepend) defined by ASN2
> > > to ASN1's route when advertised to ASN3.
> > >
> > > > Yes RFC1997 works like that but here we have opportunity to improve it.
> > >
> > > We have improved it.
> > >
> 
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