Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarification on ASLA usage for flex-algo
Peter Psenak <ppsenak@cisco.com> Mon, 10 August 2020 08:28 UTC
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To: Sarah Chen <sarahchen=40arista.com@dmarc.ietf.org>
Cc: Tony Li <tony.li@tony.li>, "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-lsr-flex-algo@ietf.org" <draft-ietf-lsr-flex-algo@ietf.org>, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Mon, 10 Aug 2020 10:27:43 +0200
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Subject: Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarification on ASLA usage for flex-algo
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Hi Sarah, On 08/08/2020 01:33, Sarah Chen wrote: > Hi, Peter, > > The flex-algo draft mentions "Min Unidirectional Link Delay as defined > in [RFC7810 <https://tools.ietf.org/html/rfc7810>]". When reading > RFC7810, I found two Sub-TLVs: > > 4.1. Unidirectional Link Delay Sub-TLV 4.2. Min/Max Unidirectional Link > Delay Sub-TLV > > Could you please clarify which one should be used? If "Min/Max > Unidirectional Link Delay Sub-TLV" is used, will the max delay carried > in the subTLV be ignored? flex-algo as defined in the draft uses "Min Unidirectional Link Delay", which is advertised in the "Min/Max Unidirectional Link Delay Sub-TLV". The fact that the "Min/Max Unidirectional Link Delay Sub-TLV" carries some other data (e.g. Max delay) is orthogonal to the flex-algo usage. thanks, Peter > > Thanks, > Sarah > > On Fri, Aug 7, 2020 at 8:30 AM <tony.li@tony.li > <mailto:tony.li@tony.li>> wrote: > > > Peter, > > > >> . The existing description in section 5.1 indicate that legacy > encoding (RFC7810 and RFC5305) is used for link attributes. That is > not correct based upon section 11. To avoid ambiguity can an > explicit reference be added for [I-D.ietf-isis-te-app]? > > > > > > well, section 5.1. is correct. The Min Unidirectional Link Delay > and TE Default metric respectively were defined in RFC7810 and > RFC5305. The fact that we advertise them in ASLA does not change > their origin. > > > Could we please get a clarification in section 5.1 then? The > references there to 7810 and 5305 without any qualification strongly > suggest that the encoding from those RFCs should be used. > > > >> Could in section 11 be explicit reference to (e)ag, te-metric > and delay link attributes MUST be encoded using ASLA.. > > > > Section 11 already says: > > > > Link attribute advertisements that are to be used during Flex- > > Algorithm calculation MUST use the Application Specific Link > > Attribute (ASLA) advertisements defined in > [I-D.ietf-isis-te-app] or > > [I-D.ietf-ospf-te-link-attr-reuse]. > > > > I'm not sure what else can we say. Listing the ones we use today > wold be dangerous, because we may define additional ones later and > we want the ASLA to be mandatory for all of them. > > > You could add a sentence that says: > > In particular, the Min Unidirectional Link Delay, TE > Default Metric, Administrative Group, Extended Administrative Group, > Shared Risk Link Group Value TLVs are all to be encoded iin the ASLA > advertisements for use with FlexAlgo. > > Please add any I missed. > > Regards, > Tony > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org <mailto:Lsr@ietf.org> > https://www.ietf.org/mailman/listinfo/lsr >
- [Lsr] [draft-ietf-lsr-flex-algo-08] Clarification… Van De Velde, Gunter (Nokia - BE/Antwerp)
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Van De Velde, Gunter (Nokia - BE/Antwerp)
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… tony.li
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Sarah Chen
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… tony.li
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Sarah Chen
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… tony.li
- Re: [Lsr] [draft-ietf-lsr-flex-algo-08] Clarifica… Peter Psenak