Re: [secdir] Secdir last call review of draft-ietf-ospf-ospfv3-segment-routing-extensions-16
Yaron Sheffer <yaronf.ietf@gmail.com> Tue, 06 November 2018 09:00 UTC
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To: Peter Psenak <ppsenak@cisco.com>, secdir@ietf.org
Cc: lsr@ietf.org, ietf@ietf.org, draft-ietf-ospf-ospfv3-segment-routing-extensions.all@ietf.org
References: <154134589488.32046.1179323499664545252@ietfa.amsl.com> <5BDFFB72.7010100@cisco.com>
From: Yaron Sheffer <yaronf.ietf@gmail.com>
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Date: Tue, 06 Nov 2018 08:13:06 +0200
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Subject: Re: [secdir] Secdir last call review of draft-ietf-ospf-ospfv3-segment-routing-extensions-16
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Thank you Peter, this addresses my comments. Yaron On 05/11/2018 10:12, Peter Psenak wrote: > Hi Yaron, > > thanks for your comments, please see inline: > > > On 04/11/18 16:38 , Yaron Sheffer wrote: >> Reviewer: Yaron Sheffer >> Review result: Has Nits >> >> Summary: document has non-security related nits. >> >> Details >> >> * The definition of "segment" is different here from the one used in the >> architecture RFC. The RFC is more abstract, quoting: A node steers a >> packet >> through an ordered list of instructions, called "segments". Whereas >> here a >> segment is simply a sub-path. This is confusing to a non-expert, and >> perhaps >> indicates a change in the group's thinking. > > the definition in this draft relates to segment as used by IGPs, in > which case a segment represents the sub-path. There are other segments > outside of IGPs which can represent other things, but they are not > covered by this draft. > > >> >> * SID/Label Sub-TLV: is it Mandatory? If so, please point it out. > > SID/Label Sub-TLV is not advertised on its own. It is advertised as a > sub-TLV of the: > > 3.2. SID/Label Range TLV > 3.3. SR Local Block TLV > > Both of these section specify that SID/Label Sub-TLV MUST be included. > >> >> * "The SR-Algorithm TLV is optional" - I find this sentence confusing. >> Maybe >> replace by "The SR-Algorithm TLV is mandatory for routers that implement >> segment routing"? > > > the text says: > > "If the SR-Algorithm TLV > is not advertised by the node, such node is considered as not being > segment routing capable." > > Isn't that sufficient? > > >> >> * The reference under "IGP Algorithm Type" registry should be to the IANA >> registry itself, not to the I-D that defines it. (In particular since >> the IANA >> registry has already been established, >> https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-algorithm-types). >> > > I got another comment from Opsdir last call review to include the I-D > that defined it. I Added them both, hopefully that satisfy everybody. > >> >> * OSPFv3 Extended Prefix Range TLV Flags octet: add the usual >> incantation about >> reserved bits. > > Done. > > > > >> * In general I agree with the reasoning in the Security >> Considerations. I would >> like to raise the question if, in addition to mis-routing, this adds a >> threat >> of massive denial-of-service on MPLS endpoints, e.g. by allowing an >> attacker >> who has OSPF access to introduce routing loops. (This may be >> completely bogus, >> I am far from expert with either of these protocols). > > above is addressed by usage of the usage of the OSPF authentication as > described in the security section. > > thanks, > Peter > >> >> . >> >
- [secdir] Secdir last call review of draft-ietf-os… Yaron Sheffer
- Re: [secdir] Secdir last call review of draft-iet… Peter Psenak
- Re: [secdir] Secdir last call review of draft-iet… Yaron Sheffer
- Re: [secdir] Secdir last call review of draft-iet… Peter Psenak