Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt

"Nobo Akiya (nobo)" <nobo@cisco.com> Wed, 21 May 2014 01:24 UTC

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From: "Nobo Akiya (nobo)" <nobo@cisco.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Mach Chen <mach.chen@huawei.com>, Hannes Gredler <hannes@juniper.net>
Thread-Topic: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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Date: Wed, 21 May 2014 01:24:37 +0000
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References: <20140508144606.23448.98448.idtracker@ietfa.amsl.com> <F3ADE4747C9E124B89F0ED2180CC814F23D873B9@xmb-aln-x02.cisco.com> <9DDF3832-A276-40F1-AF24-2CEAB31E63DC@juniper.net> <F3ADE4747C9E124B89F0ED2180CC814F23DB5518@xmb-aln-x02.cisco.com> <922372D3-6CE8-461E-9BD4-94C2B050C37D@juniper.net> <20140514153641.GC13993@pfrc> <CECE764681BE964CBE1DFF78F3CDD3941E14ED44@xmb-aln-x01.cisco.com> <20140514155739.GA14148@juniper.net> <CECE764681BE964CBE1DFF78F3CDD3941E14EDA1@xmb-aln-x01.cisco.com> <7F0CA0C7-CFD2-4B51-BA0A-A7F167B05B42@juniper.net> <CECE764681BE964CBE1DFF78F3CDD3941E14EE6A@xmb-aln-x01.cisco.com> <F73A3CB31E8BE34FA1BBE3C8F0CB2AE25D9C4A26@SZXEMA510-MBX.china.huawei.com> <CECE764681BE964CBE1DFF78F3CDD3941E150962@xmb-aln-x01.cisco.com> <7347100B5761DC41A166AC17F22DF1121B7BFAA3@eusaamb103.ericsson.se> <CECE764681BE964CBE1DFF78F3CDD3941E157C55@xmb-aln-x01.cisco.com> <7347100B5761DC41A166AC17F22DF1121B7C011B@eusaamb103.ericsson.se>
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Cc: "Les Ginsberg \(ginsberg\)" <ginsberg@cisco.com>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "isis-wg@ietf.org" <isis-wg@ietf.org>
Subject: Re: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-discriminator-00.txt
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Thanks for prompt response Greg.

Will incorporate the text in draft-ietf-...-01.

-Nobo

> -----Original Message-----
> From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
> Sent: Tuesday, May 20, 2014 9:22 PM
> To: Nobo Akiya (nobo); Mach Chen; Hannes Gredler
> Cc: Les Ginsberg (ginsberg); rtg-bfd@ietf.org; isis-wg@ietf.org
> Subject: RE: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-
> discriminator-00.txt
> 
> Hi Nobo,
> I like it.
> 
> 	Regards,
> 		Greg
> 
> -----Original Message-----
> From: Nobo Akiya (nobo) [mailto:nobo@cisco.com]
> Sent: Tuesday, May 20, 2014 6:18 PM
> To: Gregory Mirsky; Mach Chen; Hannes Gredler
> Cc: Les Ginsberg (ginsberg); rtg-bfd@ietf.org; isis-wg@ietf.org
> Subject: RE: [Isis-wg] New Version Notification for draft-ginsberg-isis-sbfd-
> discriminator-00.txt
> 
> Hi Greg,
> 
> That's true, the whole paragraph in the section 7 of S-BFD base document is
> just describing some possible implementation techniques. How about we
> change the paragraph:
> 
> [old]
>    Note that incoming BFD control packets destined to BFD target
>    identifier types may be IPv4, IPv6 or MPLS based.  For those BFD
>    target identifier types, implementations MAY either allow the same
>    reflector BFD session to handle all incoming BFD control packets in
>    address family agnostic fashion, or setup multiple reflector BFD
>    sessions to handle incoming BFD control packets with different
>    address families.  This policy is again a local matter, and is
>    outside the scope of this document.
> 
> [new]
>    Note that incoming BFD control packets destined to BFD target
>    identifier types may be IPv4, IPv6 or MPLS based.  How such packets
>    reach an appropriate reflector BFD session is a local matter, and is
>    outside the scope of this document.
> 
> -Nobo
> 
> > -----Original Message-----
> > From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
> > Sent: Tuesday, May 20, 2014 6:46 PM
> > To: Nobo Akiya (nobo); Mach Chen; Hannes Gredler
> > Cc: Les Ginsberg (ginsberg); rtg-bfd@ietf.org; isis-wg@ietf.org
> > Subject: RE: [Isis-wg] New Version Notification for
> > draft-ginsberg-isis-sbfd- discriminator-00.txt
> >
> > Dear All,
> > according to Section 7 of the S-BFD Base document differentiation
> > among address families by S-BFD is optional and mention in connection
> > to separate S-BFD reflectors to act as per-AF reflectors. Perhaps I've
> > missed that part of S-BFD Base discussion but I don't see the benefit of
> supporting such mode.
> > BFD control packets been AF-agnostic since RFC 5880 and I think that
> > S-BFD should maintain that approach.
> >
> > I agree with Mach that discriminators in S-BFD, as well as in BFD, are
> > and must remain AF blind.
> >
> > 	Regards,
> > 		Greg
> >
> > -----Original Message-----
> > From: Rtg-bfd [mailto:rtg-bfd-bounces@ietf.org] On Behalf Of Nobo
> > Akiya
> > (nobo)
> > Sent: Thursday, May 15, 2014 7:07 AM
> > To: Mach Chen; Hannes Gredler
> > Cc: Les Ginsberg (ginsberg); rtg-bfd@ietf.org; isis-wg@ietf.org
> > Subject: RE: [Isis-wg] New Version Notification for
> > draft-ginsberg-isis-sbfd- discriminator-00.txt
> >
> > Hi Mach, Hannes, et al,
> >
> > > IMHO, the capability issue should not be a S-BFD specific issue,
> > > even not BFD specified issue. It is actually a forwarding capability
> > > issue, it is about whether the target node can process IPv4, IPv6,
> > > MPLS, SR encapsulated BFD packets.
> >
> > I agree Mach, mostly :)
> >
> > I can also see one arguing that forwarding supporting X does not
> > always mean S-BFD is supported on X. If we want to address this, then
> > it is an S-BFD specific issue, and we _may_ want to solve this via
> > introducing S-BFD capability advertisements.
> >
> > With that said, S-BFD discriminator advertisement is one area which
> > the capability problem can be solved, but not necessary a problem that
> > has to be solved with S-BFD discriminator advertisement. Rather I
> > don't think the two should be bundled together.
> >
> > Let us continue the capability discussion separate from the
> > discriminator advertisements?
> >
> > -Nobo
> >