Re: [Lsr] Secdir last call review of draft-ietf-ospf-ospfv3-segment-routing-extensions-16
Peter Psenak <ppsenak@cisco.com> Fri, 09 November 2018 11:44 UTC
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Date: Fri, 09 Nov 2018 12:44:20 +0100
From: Peter Psenak <ppsenak@cisco.com>
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To: Yaron Sheffer <yaronf.ietf@gmail.com>, secdir@ietf.org
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Subject: Re: [Lsr] Secdir last call review of draft-ietf-ospf-ospfv3-segment-routing-extensions-16
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Hi Yaron, On 06/11/18 07:13 , Yaron Sheffer wrote: > Thank you Peter, this addresses my comments. latest version (17) includes your comments. thanks, Peter > > 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 >> >>> >>> . >>> >> > . >
- [Lsr] Secdir last call review of draft-ietf-ospf-… Yaron Sheffer
- Re: [Lsr] Secdir last call review of draft-ietf-o… Peter Psenak
- Re: [Lsr] Secdir last call review of draft-ietf-o… Yaron Sheffer
- Re: [Lsr] Secdir last call review of draft-ietf-o… Peter Psenak