Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis-01
Alia Atlas <akatlas@gmail.com> Fri, 17 March 2017 18:13 UTC
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From: Alia Atlas <akatlas@gmail.com>
Date: Fri, 17 Mar 2017 14:13:19 -0400
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Cc: "isis-wg@ietf.org" <isis-wg@ietf.org>, "draft-ietf-isis-mi-bis@ietf.org" <draft-ietf-isis-mi-bis@ietf.org>
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Subject: Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis-01
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Hi Les, On Fri, Mar 17, 2017 at 1:57 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.com > wrote: > Alia – > > > > Thanx for meticulous review. > > Inline. > > > > *From:* Alia Atlas [mailto:akatlas@gmail.com] > *Sent:* Friday, March 17, 2017 8:47 AM > *To:* isis-wg@ietf.org; draft-ietf-isis-mi-bis@ietf.org > *Subject:* AD review of draft-ietf-isis-mi-bis-01 > > > > As is customary, I have done my AD review of draft-ietf-isis-mi-bis-01. > First, I would like to thank the authors - Les, Stefano, and Wim - for > their work on this document. > > > > I do have a few minor issues that need to be fixed ASAP. I will, > however, go ahead and issue a 3 week IETF Last Call for it so that, if the > authors act promptly, it can be on the April 13 telechat. > > > > > > 1) This draft pretty clearly should obsolete RFC 6822, but the header > claims to merely > > update it. > > > > *[Les:] OK* > > > > 2) Sec 2.6.2: " Point-to-point adjacency setup MUST be done through the > use of the > three-way handshaking procedure as defined in [RFC5303] in order > to > prevent a non-MI capable neighbor from bringing up an adjacency > prematurely based on reception of an IIH with an IID-TLV for a > non- > zero instance." > > While obviously the 3-way handshake in RFC5303 is fine, given that > different MAC addresses are used, I don't see how a non-MI capable neighbor > would receive and process an IIH with an IID-TLV where IID != 0. > > > > *[Les:] Section 2.6.2 is only talking about true pt-pt media – hence MAC > multicast addresses are not relevant. In Section 2.6.1 we discuss the case > of operating in Pt-Pt mode on a broadcast circuit:* > > > > *“When operating in point-to-point mode on a broadcast circuit* > > * [RFC5309]…”* > Thanks - you are completely correct. 3) In Appendix A:" Clarification that the IID-TLV is only included in > Pt-Pt IIHs > > associated with non-zero instances has been added. This addresses > Errata ID #4519." > > In Sec 2.6.2, it says "The presence or absence of the IID-TLV in an IIH > indicates that the > neighbor does or does not support this extension, respectively. > Therefore, all IIHs sent on a point-to-point circuit by an MI-RTR > MUST include an IID-TLV. This includes IIHs associated with IID #0." > which is a direct > > contradiction and needed since the IID-TLV is used as a capability > indication. The > > simplest solution is to remove the claim from the Appendix. > > *[Les:] Again, you are confusing Pt-Pt media with Pt-Pt operation on a > Broadcast media. Errata 4519 is concerned with Pt-Pt operation on a LAN – > and some modest clarifications in Section 2.6.1 were made to more > completely cover the latter case.* > > *In the Pt-Pt operation on a LAN case it IS illegal to send IID-TLV in > hellos for the zero instance – which Section 2.6.1 explicitly states.* > > > > *Perhaps the Appendix should say:* > > > > *“Clarification that when operating in point-to-point mode on a broadcast > circuit the IID-TLV is only included in Pt-Pt IIHs* > > * associated with non-zero instances has been added. ..”* > > > > *Will this address your concern?* > Yes, I didn't go and look up Errata ID #4519 to catch the context of pt-to-pt on broadcast only. That would make it more of a nit than a minor issue, of course. This all does imply that: a) IIH with IID=0 is a capability advertisement for pt-to-pt links but not pt-to-pt on broadcast. b) It is never ok (discarded by receiver) to send an IIH with IID=0 on a pt-to-pt on broadcast. c) The capability indicator for being an MI-RTR on a pt-to-pt on broadcast link is whether or not the ALLL1MI-IS or ALLL2MI-IS is listened to or sent on. I know there is real code and deployments behind this - but that's a bit confusing for trouble-shooting & it would be nice to have it more clearly articulated. > 4) In the IANA considerations, the references should be updated to point > to this document, and most particularly if it obsoletes RFC 6822. > > > > *[Les:] Agreed. I did not think I had to state that – I assumed IANA would > just do that – but I am happy to add a line in IANA section stating that > all references to RFC 6822 should be updated to point to this document.* > Yes - we need to do that. Incidentally, on another reread (checking the above issues) is there a reason that "The destination multicast address is one of the two new addresses and the PDU contains an IID-TLV with a zero value for the IID or has no IID-TLV." doesn't simply name the addresses (ALLL1MI-IS or ALLL2MI-IS)? I think that'd be clearer - but this is definitely nit. > *Let me know if the above changes will suffice and I will spin a new > version.* > Sounds good. Thanks, Alia > * Les* > > > > Regards, > > Alia >
- [Isis-wg] AD review of draft-ietf-isis-mi-bis-01 Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alexander Okonnikov
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alexander Okonnikov
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Alia Atlas
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Les Ginsberg (ginsberg)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Acee Lindem (acee)
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri
- Re: [Isis-wg] AD review of draft-ietf-isis-mi-bis… Uma Chunduri