Re: [Isis-wg] Alvaro Retana's No Objection on draft-ietf-isis-auto-conf-04: (with COMMENT)
"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Sat, 08 April 2017 00:49 UTC
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Alvaro Retana (aretana)" <aretana@cisco.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-isis-auto-conf@ietf.org" <draft-ietf-isis-auto-conf@ietf.org>, Hannes Gredler <hannes@gredler.at>, "isis-chairs@ietf.org" <isis-chairs@ietf.org>, "isis-wg@ietf.org" <isis-wg@ietf.org>
Thread-Topic: Alvaro Retana's No Objection on draft-ietf-isis-auto-conf-04: (with COMMENT)
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Date: Sat, 08 Apr 2017 00:49:14 +0000
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Subject: Re: [Isis-wg] Alvaro Retana's No Objection on draft-ietf-isis-auto-conf-04: (with COMMENT)
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Alvarao - > -----Original Message----- > From: Alvaro Retana (aretana) > Sent: Friday, April 07, 2017 2:26 PM > To: Les Ginsberg (ginsberg); The IESG > Cc: draft-ietf-isis-auto-conf@ietf.org; Hannes Gredler; isis-chairs@ietf.org; > isis-wg@ietf.org > Subject: Re: Alvaro Retana's No Objection on draft-ietf-isis-auto-conf-04: > (with COMMENT) > > On 4/7/17, 5:09 PM, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com> wrote: > > Les: > > Hi! > > … > > > (2) What about the other bits in the Flag field, how should they be > > > registered in the future (if needed)? Please ask IANA to define a registry > for them. > > > > > [Les:] I don't think a registry is needed. If an additional flag is > > required then a bis draft will be required. > > No. That’s the point of specifying how others may request a flag in a registry: > then they can go to IANA and not touch your document. > > If I try to read between the lines…it sounds like you’re saying that the TLV > would have no other use than for auto-configuration, so if any new flag is to > be assigned it would necessarily have to modify this document. Is that what > you mean? > > Honestly, I think it is just good practice to define how the remaining bits > should be assigned/or not in the future. But I’ll let the responsible AD make > the call. ;-) > [Les:] There are other examples of flags fields in IS-IS: RFC 5306 Section 3.2 Restart TLV RFC 7981 Section 2 Router Capability TLV draft-ietf-isis-segment-routing-extensions We do not define an IANA registry for these - and I think with good reason. These are NOT general purpose flags which anyone can make use of - they are directly tied to the functionality of the TLV/sub-TLV in which they appear. To add a flag means one is extending the feature described in the original specification - a bis draft is a MUST. Les > > … > > > (5) I thought the point of this document was for use in "unmanaged > > > deployments. It allows IS-IS to be used without the need for any > > > configuration by the user." But Section 3.5. (Additional IS-IS TLVs > > > Usage > > > Guidelines) has recommendations for configuration options, including > > > manually configured adjacencies (which should not be allowed > > > according to Section 3.4.2. (Adjacency Formation)). Isn't this > > > against the stated reasons for this document? > > > > > [Les:] The mention of "manually configured adjacencies" is in the > > context of what the default metric should be for non-manual adjacencies. > > We do not recommend manual configuration, but it is not illegal to do it. > > Would manual configuration unset the A flag because now the node is not > acting in auto-configuration mode? > > I know some of this was discussed on the list before, but if partial manual > configuration is allowed (and the A flag is still set), what prevents a manually > configured router from setting the A flag and if the parameters (area, level, > etc.) match, form an adjacency? There was a discussion about not allowing > non-auto-configured routers and auto-configured ones from becoming > adjacent. > > > > > (6) Authentication is one of those features that could be manually > > > configured > > > -- but the default is no authentication. There's a > > > higher-than-usual risk of a node listening on the network (probably > > > a bigger problem for the user traffic), but also one that could > > > listen to the Hellos and purposefully trigger the duplicate > > > resolution mechanism to continuously run. This risk should be > > > highlighted in the Security Considerations because it is newly > > > introduced here. [Robert Sparks pointed this risk out during his > > > GenArt review.] > > > > > [Les:] Let me know if the answer I provided to Robert suffices. > > No. I would have the same answer that he did: you should describe the new > risk. But let’s keep the discussion on that thread. > > Thanks! > > Alvaro.
- [Isis-wg] Alvaro Retana's No Objection on draft-i… Alvaro Retana
- Re: [Isis-wg] Alvaro Retana's No Objection on dra… Alvaro Retana (aretana)
- Re: [Isis-wg] Alvaro Retana's No Objection on dra… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Alvaro Retana's No Objection on dra… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Alvaro Retana's No Objection on dra… Liubing (Leo)