Hi Les, Thanks for the review and comments. Pls see inline for replies.
Juniper Business Use Only From: Les Ginsberg (ginsberg) <[email protected]> Sent: Monday, November 30, 2020 11:44 AM To: Shraddha Hegde <[email protected]>; [email protected] Subject: RE: New Version Notification for draft-white-lsr-distoptflood-00.txt [External Email. Be cautious of content] Draft authors - I note that as the draft has evolved over the years a number of mechanisms have been removed (revised adjacency formation and auto tier detection) and the draft now focuses exclusively on flooding optimizations. The draft now also references the recent work done in draft-ietf-lsr-dynamic-flooding. A couple of things are not clear to me. 1)Is it your intent to use the mechanisms defined in draft-ietf-lsr-dynamic-flooding? I am specifically - though not exclusively - referring to how flooding adapts to topology changes. It isn't clear from Section 3 whether you are actually intending to use the mechanisms defined in https://tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-07#section-6.8<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-07*section-6.8__;Iw!!NEt6yMaO-gk!VproGis8uUGmcl-cCplFMwuNceAo-3roUZT7ZdTlwvY7nJSszUo9AeWXymgguZIt$> or whether you simply want to use the Flooding sub-TLV defined in draft-ietf-lsr-dynamic-flooding to (optionally??) advertise your algorithm and all other procedures are specific to your algorithm. <Shraddha> We want to use the " IS-IS Dynamic Flooding Sub-TLV" defined in sec 5.1.2 of the lsr-dynamic-flooding draft just to flood the information that nodes support the algorithm specified in draft-white-lsr-distoptflood. I agree it's not writen very well. I'll update that section in next version. 2)The text at the end of https://tools.ietf.org/html/draft-white-lsr-distoptflood-00#section-2.1<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-white-lsr-distoptflood-00*section-2.1__;Iw!!NEt6yMaO-gk!VproGis8uUGmcl-cCplFMwuNceAo-3roUZT7ZdTlwvY7nJSszUo9AeWXyucq9YRN$> states: " LSPs transmitted to adjacent neighbors on the DNR list, however, MUST be transmitted using a circuit scope PDU as described in [RFC7356]." Although this text is not new to this revision, it raises a number of questions/concerns - some of which relate to how this draft fits with draft-ietf-lsr-dynamic-flooding. For "DNR neighbors", although a circuit scoped LSP was received, the actual content is a traditional area scoped LSP. <Shraddha> yes. This presumably needs to be used internally (e.g., when running the Decision Process) in the same way as an area scoped LSP. <Shraddha> yes. So there are now two internal databases (traditional area LSPs and Circuit Scoped LSPs) which have to be used as if they are a single database? <Shraddha> Yes that is correct When a node sends a traditional CSNP does it include the LSPs it received as Circuit-Scoped LSPs? If not, how is resynchronization achieved when necessary? <Shraddha> yes. CSNPs includes circuit scoped LSPs. Since you raised this point, I am thinking that we need a protocol extension to indicate that "this circuit scoped LSP" should be treated In this special way. Given the base work defined in draft-ietf-lsr-dynamic-flooding why is the use of Circuit Scoped LSPs required/useful? <Shraddha> I am not sure which base work you are suggesting to use. Could you pls provide details? The flooding algorithm as written in the draft breaks if circuit scoped flooding is not done. Because, the distributed algorithm does not flood the LSP back in the direction from where it was originated. In general, it would be helpful to more completely define the relationship between this draft and draft-ietf-lsr-dynamic-flooding. <Shraddha> yes. I'll produce next version soon. Thanx. Les > -----Original Message----- > From: Lsr <[email protected]<mailto:[email protected]>> On Behalf Of > Shraddha Hegde > Sent: Sunday, November 29, 2020 8:36 PM > To: [email protected]<mailto:[email protected]> > Subject: [Lsr] FW: New Version Notification for draft-white-lsr-distoptflood- > 00.txt > > WG members, > > > We have posted new version of the draft-white-lsr-distoptflood. > This draft has been around for sometime by name openfabric and > draft-white-distoptflood. The current revision has the name changed > to reflect LSR WG. > This draft describes a flood reduction mechanism in ISIS which is based on > similar mechanisms implemented in OSPF for mobile-ad-hoc Networks > ([RFC5449], [RFC5614], and [RFC7182]). > > Request working group to review and provide inputs. > > Rgds > Shraddha > > > Juniper Business Use Only > > -----Original Message----- > From: [email protected]<mailto:[email protected]> > <[email protected]<mailto:[email protected]>> > Sent: Monday, November 30, 2020 9:59 AM > To: Shraddha Hegde <[email protected]<mailto:[email protected]>>; Russ > White <[email protected]<mailto:[email protected]>>; > Shawn Zandi <[email protected]<mailto:[email protected]>> > Subject: New Version Notification for draft-white-lsr-distoptflood-00.txt > > [External Email. Be cautious of content] > > > A new version of I-D, draft-white-lsr-distoptflood-00.txt > has been successfully submitted by Shraddha Hegde and posted to the IETF > repository. > > Name: draft-white-lsr-distoptflood > Revision: 00 > Title: IS-IS Optimal Distributed Flooding for Dense Topologies > Document date: 2020-11-29 > Group: Individual Submission > Pages: 12 > URL: > https://urldefense.com/v3/__https://www.ietf.org/archive/id/draft-white-<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-white-lsr-distoptflood-00.txt__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO$> > lsr-distoptflood-00.txt__;!!NEt6yMaO-<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-white-lsr-distoptflood-00.txt__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO$> > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-white-lsr-distoptflood-00.txt__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO$> > $<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-white-lsr-distoptflood-00.txt__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSEm2FfjO$> > Status: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-white-<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-white-lsr-distoptflood/__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwavY$> > lsr-distoptflood/__;!!NEt6yMaO-<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-white-lsr-distoptflood/__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwavY$> > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwav<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-white-lsr-distoptflood/__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwavY$> > Y$<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-white-lsr-distoptflood/__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSC0pwavY$> > Htmlized: > https://urldefense.com/v3/__https://datatracker.ietf.org/doc/html/draft-<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-white-lsr-distoptflood__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl$> > white-lsr-distoptflood__;!!NEt6yMaO-<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-white-lsr-distoptflood__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl$> > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-white-lsr-distoptflood__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl$> > $<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/draft-white-lsr-distoptflood__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSFYebZSl$> > Htmlized: > https://urldefense.com/v3/__https://tools.ietf.org/html/draft-<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-white-lsr-distoptflood-00__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q2$> > white-lsr-distoptflood-00__;!!NEt6yMaO-<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-white-lsr-distoptflood-00__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q2$> > gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-white-lsr-distoptflood-00__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q2$> > 2$<https://urldefense.com/v3/__https:/tools.ietf.org/html/draft-white-lsr-distoptflood-00__;!!NEt6yMaO-gk!T5HX4Enn7jt3zwKoZBiA85YlysK0tdcELjk7Fy829PRSockmshBtqxzkSANTt6Q2$> > > > Abstract: > In dense topologies, such as data center fabrics based on the Clos > and butterfly fabric topologies, flooding mechanisms designed for > sparse topologies, when used in these dense topologies, can > "overflood," or carry too many copies of topology and reachability to > fabric devices. This results in slower convergence times and higher > resource utilization. The modifications to the flooding mechanism in > the Intermediate System to Intermediate System (IS-IS) link state > protocol described in this document reduce resource utilization to a > minimum, while increaseing convergence performance in dense > topologies. > > Note that a Clos fabric is used as the primary example of a desne > flooding topology throughout this document. However, the flooding > optimizations described in this document apply to any dense topology. > > > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > _______________________________________________ > Lsr mailing list > [email protected]<mailto:[email protected]> > https://www.ietf.org/mailman/listinfo/lsr<https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/lsr__;!!NEt6yMaO-gk!VproGis8uUGmcl-cCplFMwuNceAo-3roUZT7ZdTlwvY7nJSszUo9AeWXylitwgOR$>
_______________________________________________ Lsr mailing list [email protected] https://www.ietf.org/mailman/listinfo/lsr
