Ron I agree the way the RFC 8919 and 8920 are written it is more of an intent by the authors based on normative language as you have stated and not violating the specification.
I think it does sound like that future attributes developed the authors kept it open to developers be application independent and not a MUST normative language for ASLA unfortunately it seems created a loophole, however I am not sure why it was written that way as it defeats the goal and purpose of RFC 8919 and RFC 8920. Kind Regards Gyan On Fri, Jul 23, 2021 at 12:13 AM Ron Bonica <rbonica= 40juniper....@dmarc.ietf.org> wrote: > Les, > > Please, let us avoid discussion of whether my message is disingenuous. As > Acee will agree, discussion of my internal motivations and moral > deficiencies is beyond the scope of the LSR WG. > > Now, let us address my point and your counter points. My point was that > draft-ietf-lsr-flex-algo-bw-con does not violate RFC 8919. Nothing more, > nothing less. > > In your counterpoint #1, you point out tension between > draft-ietf-lsr-flex-algo-bw-con and draft-ietf-lsr-flex-algo. While this > point deserves discussion, it is orthogonal to my point. It is entirely > possible that both of the following statements are true: > > - draft-ietf-lsr-flex-algo-bw-con does not violate RFC 8919 > - there is tension between draft-ietf-lsr-flex-algo-bw-con and > draft-ietf-lsr-flex-algo > > In your counterpoint #2, you talk about the "clear intent" of RFC 8919. > Section 6.1 of RFC 8919 reduces that intent to a few very clear normative > statements. Draft-ietf-lsr-flex-algo-bw-con does not violate any of those > normative statements. Therefore, it does not violate RFC 8919. > > You may say: > > - Section 6.1 should have included more prohibitions > - The authors had additional prohibitions in mind when they wrote the > draft, but failed to add them to Section 6.1 > > That's all fine, but the community agreed only to the words on the page, > not the authors larger intent. > > > Ron > > > > > > Juniper Business Use Only > > -----Original Message----- > From: Les Ginsberg (ginsberg) <ginsberg=40cisco....@dmarc.ietf.org> > Sent: Thursday, July 22, 2021 2:49 PM > To: Ron Bonica <rbon...@juniper.net>; Acee Lindem (acee) <a...@cisco.com>; > Shraddha Hegde <shrad...@juniper.net>; gregory.mir...@ztetx.com; Peter > Psenak (ppsenak) <ppse...@cisco.com>; lsr@ietf.org > Cc: draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org > Subject: RE: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-01.txt > > [External Email. Be cautious of content] > > > Ron - > > With respect, it is hard to read your email without feeling that it is > disingenuous. > > But, let's cover the relevant points nonetheless. > > Point #1: > > > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-17*section-12__;Iw!!NEt6yMaO-gk!XOCcoj-YdMkhznRiGAo1oeY1A6HMHuk5BDmsYqHAUf_hYgKb9tlp_Umpu3UxZFFM$ > states: > > " Link attribute advertisements that are to be used during Flex- > Algorithm calculation MUST use the Application-Specific Link > Attribute (ASLA) advertisements defined in [RFC8919] or [RFC8920]..." > > As the new generic-metric is intended for use by flex-algo it needs to > conform to this normative statement. > > Point #2: > > RFC 8919 and 8920 were written to address ambiguities associated with the > use of multiple applications. > The Introduction sections of both documents discuss this in some detail. > > The clear intent is to make use of ASLA going forward - not to restrict > ASLA only to the set of link attributes defined at the time of the writing > of the RFCs. Failure to do so would reintroduce the same set of issues that > RFC 8919/8920 were written to address. > Your attempt to infer that because Generic-Metric was not defined at the > time that RFC 8919/8920 were written that the RFCs don’t apply to it makes > no sense. > ASLA is in fact a revision to the link attribute architecture and is meant > to be used going forward. > > The more appropriate question to ask is why we need to define a legacy > style sub-TLV for new link attributes? Ketan has made this point in his > post on this thread and I have sympathy with his position. > > We do understand that legacy applications such as RSVP-TE may continue to > be deployed in networks for some time to come. It is not reasonable to > expect that legacy application implementations will be updated to use ASLA, > which is why I do not object to defining a legacy style encoding for > Generic Metric if folks believe that legacy applications may be enhanced to > support new link attributes. > > I strongly disagree with your interpretation that ASLA is limited only to > the code points defined in RFC 8919/8920. > > Les > > > > -----Original Message----- > > From: Ron Bonica <rbonica=40juniper....@dmarc.ietf.org> > > Sent: Thursday, July 22, 2021 10:28 AM > > To: Acee Lindem (acee) <a...@cisco.com>; Les Ginsberg (ginsberg) > > <ginsb...@cisco.com>; Shraddha Hegde <shrad...@juniper.net>; > > gregory.mir...@ztetx.com; Peter Psenak (ppsenak) <ppse...@cisco.com>; > > lsr@ietf.org > > Cc: draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org > > Subject: RE: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-01.txt > > > > Acee, > > > > I don't think that draft-ietf-lsr-flex-algo-bw-con violates RFC 8919. > > > > Section 6.1 of RFC 8919 says: > > > > " New applications that future documents define to make use of the > > advertisements defined in this document MUST NOT make use of legacy > > advertisements. This simplifies deployment of new applications by > > eliminating the need to support multiple ways to advertise attributes > > for the new applications." > > > > Section 3 of RFC 8919 defines legacy advertisements. The definition of > > legacy advertisements does not include new attributes such as generic > > metric. Therefore draft-ietf-lsr-flex-algo-bw-con does not violate RFC > > 8919 > > > > Relevant text from Section 3 of RFC 8919 is included below for > convenience. > > > > > > Ron > > > > > > RFC 8919, Section 3 > > --------------------------- > > 3. Legacy Advertisements > > > > > > Existing advertisements used in support of RSVP-TE include sub-TLVs > > for TLVs 22, 23, 25, 141, 222, and 223 and TLVs for Shared Risk Link > > Group (SRLG) advertisement. > > > > Sub-TLV values are defined in the "Sub-TLVs for TLVs 22, 23, 25, 141, > > 222, and 223" registry. > > > > TLVs are defined in the "TLV Codepoints Registry". > > > > 3.1. Legacy Sub-TLVs > > > > +======+====================================+ > > | Type | Description | > > +======+====================================+ > > | 3 | Administrative group (color) | > > +------+------------------------------------+ > > | 9 | Maximum link bandwidth | > > +------+------------------------------------+ > > | 10 | Maximum reservable link bandwidth | > > +------+------------------------------------+ > > | 11 | Unreserved bandwidth | > > +------+------------------------------------+ > > | 14 | Extended Administrative Group | > > +------+------------------------------------+ > > | 18 | TE Default Metric | > > +------+------------------------------------+ > > | 33 | Unidirectional Link Delay | > > +------+------------------------------------+ > > | 34 | Min/Max Unidirectional Link Delay | > > +------+------------------------------------+ > > | 35 | Unidirectional Delay Variation | > > +------+------------------------------------+ > > | 36 | Unidirectional Link Loss | > > +------+------------------------------------+ > > | 37 | Unidirectional Residual Bandwidth | > > +------+------------------------------------+ > > | 38 | Unidirectional Available Bandwidth | > > +------+------------------------------------+ > > | 39 | Unidirectional Utilized Bandwidth | > > +------+------------------------------------+ > > > > Table 1: Sub-TLVs for TLVs 22, 23, 25, > > 141, 222, and 223 > > > > > > > > Juniper Business Use Only > > > > -----Original Message----- > > From: Lsr <lsr-boun...@ietf.org> On Behalf Of Acee Lindem (acee) > > Sent: Tuesday, July 20, 2021 1:21 PM > > To: Les Ginsberg (ginsberg) <ginsberg=40cisco....@dmarc.ietf.org>; > > Shraddha Hegde <shrad...@juniper.net>; gregory.mir...@ztetx.com; > > ppsenak=40cisco....@dmarc.ietf.org; lsr@ietf.org > > Cc: draft-ietf-lsr-flex-algo-bw-con.auth...@ietf.org > > Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-bw-con-01.txt > > > > [External Email. Be cautious of content] > > > > > > Speaking as WG member: > > > > I agree with Les. The Generic Metric MUST be advertised as an ASLA for > > usage in Flex Algorithm. Additionally, it may be advertised as a > > sub-TLV in IS- IS link TLVs. However, the latter encoding really > > shouldn't be used for new applications (at least that is my reading of > RFC 8919). > > > > For OSPF, I'd certainly hope one wouldn't originate additional LSAs > > when an ASLA can support the legacy applications with the ASLA mask. > > > > Thanks, > > Acee > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > -- <http://www.verizon.com/> *Gyan Mishra* *Network Solutions A**rchitect * *Email gyan.s.mis...@verizon.com <gyan.s.mis...@verizon.com>* *M 301 502-1347*
_______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr
