Re: [Lsr] Secdir last call review of draft-ietf-isis-reverse-metric-13
Barry Leiba <barryleiba@computer.org> Fri, 05 October 2018 04:36 UTC
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From: Barry Leiba <barryleiba@computer.org>
Date: Fri, 05 Oct 2018 00:36:35 -0400
Message-ID: <CALaySJLH9O888YJ6cRe7LnaPip4kvBatU=a8+4fdV_WnBF-LHQ@mail.gmail.com>
To: "Naiming Shen (naiming)" <naiming@cisco.com>
Cc: "draft-ietf-isis-reverse-metric.all@ietf.org" <draft-ietf-isis-reverse-metric.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "secdir@ietf.org" <secdir@ietf.org>
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Subject: Re: [Lsr] Secdir last call review of draft-ietf-isis-reverse-metric-13
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Perfect; thanks. Barry On Fri, Oct 5, 2018 at 12:33 AM Naiming Shen (naiming) <naiming@cisco.com> wrote: > > Hi Barry, > > Thanks for the review and your suggestion makes sense. The original wording > is confusing. Also, as Tony has pointed out in the same thread, this > sentence > was the original intention when start of the draft, but it has been > extended for > other use cases described in section 1. How about this on top of your > suggestions: > > For the use case in section 1.1, Node and Link Isolation, a router MUST > limit > the period during which it advertises a Reverse Metric TLV toward a > neighbor > only to the operational maintenance window period during which it wants > that > neighbor to temporarily update its IS-IS metric or Traffic Engineering > parameters > towards it. > > Best Regards, > - Naiming > > > On Oct 4, 2018, at 10:36 AM, Barry Leiba <barryleiba@computer.org> > wrote: > > > > Reviewer: Barry Leiba > > Review result: Ready > > > > This document is well written and seems ready to go. The only security > issue I > > thought of as I read through it (attacking by spoofing a reverse metric) > is > > covered in the Security Considerations section. > > > > I found one sentence to be slightly ambiguous, but only very slightly. > In > > Section 3.5: > > > > A router MUST advertise a Reverse Metric TLV toward a neighbor only > > for the operational maintenance window period during which it wants a > > neighbor to temporarily update its IS-IS metric or Traffic > > Engineering parameters towards it. > > > > It begins to look like it's saying that a router MUST advertise this > under > > certain conditions, and it took me a moment to get that it's actually > > *limiting* when it should be advertised (the "MUST" applies to the "only" > > clause). If you think my suggested replacement reads well, you might > use it; > > if not, no problem: > > > > A router MUST limit the period during which it advertises a Reverse > Metric > > TLV toward a neighbor only to the operational maintenance window period > > during which it wants that neighbor to temporarily update its IS-IS > metric > > or Traffic Engineering parameters towards it. > > > > -- Barry -- Barry Leiba (barryleiba@computer.org) http://internetmessagingtechnology.org/
- [Lsr] Secdir last call review of draft-ietf-isis-… Barry Leiba
- Re: [Lsr] Secdir last call review of draft-ietf-i… Tony Przygienda
- Re: [Lsr] Secdir last call review of draft-ietf-i… Naiming Shen (naiming)
- Re: [Lsr] Secdir last call review of draft-ietf-i… Barry Leiba