Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
Huaimo Chen <huaimo.chen@futurewei.com> Mon, 15 August 2022 15:20 UTC
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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Toerless Eckert <tte@cs.fau.de>, "bier@ietf.org" <bier@ietf.org>
Thread-Topic: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
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Date: Mon, 15 Aug 2022 15:20:29 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/zRcXorrxGJAejySoJrCQDYwOGmc>
Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
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Hi Toerless, Thanks much for your comments. My responses are inline below with [HC]. Best Regards, Huaimo ________________________________ From: BIER <bier-bounces@ietf.org> on behalf of Toerless Eckert <tte@cs.fau.de> Sent: Friday, August 12, 2022 11:52 AM To: bier@ietf.org <bier@ietf.org> Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt A) > No Sub-Sub-TLV is defined so far. are ? [HC]: No Sub-Sub-TLV is defined so far. B) > Note that if each of BitPosition and DrEndBitPosition uses more > than 2 octets, we use 4 or more octets for each of them. I do not understand what this means. Are you implying that the field BitPosition in your Sub-TLV could be longer than the indicated 16 bit in Figure 1 ? If so, how would a recipient know that it is not 16 bit long ? [HC]: The BitPosition assigned to (or configured for) an adjacency of the network topology is distributed in the Sub-TLV. If the number of adjacencies is greater than 64k in the network, it cannot be represented by 16 bits directly. I also don't think the BIER/BIER-TE architecture would permit this field to be longer than 16 bits, we (BIER/BIER-TE) only support 64k in both. [HC]: If BIER-TE architecture does not permit this and only supports 64k adjacencies, then the distribution of the bit positions for the adjacencies in this draft will follow it. C) I think the word BitPosition and DrEndBitPosition are not correct. What you do seemingly want to encode is what BIER (and RFC8401) calls BFR-id, and BIER-TE unfortunately weaseled out giving a new name (unfortunately, bfr-id does not make sense for BIER-TE even though the values themselves do make equally sense). I guess we should have given it a name like ADJ-id, and that is what i would suggest calling this field. Maybe add simple explanation: ADJ-id = BitPosition + SI * BSL (like BFR-id in BIER) Or else, we can also just call it bfr-id like RFC8401, just noting that the semantic of the indicated bit is not that of a BIER bfr-id, but of a BIER-TE foward_connected() adjacency. In any case, bit position / BitPosition is consistently used in rfc8279 and BIER-TE to solely refer to bits within a BitString in a packet (<= 4096), not across all the BitString bits spossible for an SD (<= 64k). [HC]: This draft just distributes the bit position configured for or assigned to an adjacency. D) I still don't think i have seen an answer giving an exxample of what DrEndBitPosition could be. Still curious. [HC]: Draft "BIER-TE for Broadcast Link" describes it in detail. Cheers Toerless On Fri, Jul 29, 2022 at 12:13:19PM -0700, internet-drafts@ietf.org wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Bit Indexed Explicit Replication WG of the IETF. > > Title : IS-IS Extensions for BIER-TE > Authors : Huaimo Chen > Mike McBride > Aijun Wang > Gyan S. Mishra > Yanhe Fan > Lei Liu > Xufeng Liu > Filename : draft-ietf-bier-te-isis-01.txt > Pages : 7 > Date : 2022-07-29 > > Abstract: > This document describes IS-IS extensions for distributing > BitPositions configured on the links in "Bit Index Explicit > Replication Traffic Engineering" (BIER-TE) domain. > > > > The IETF datatracker status page for this draft is: > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-bier-te-isis%2F&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18da4fa2fc66453333b908da7c7abbf4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637959163847747562%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=VcsW5ozVjbFNZIo%2BBxHJPzAuMlM1puXxE0NsRBfA7CI%3D&reserved=0 > > There is also an htmlized version available at: > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-bier-te-isis-01&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18da4fa2fc66453333b908da7c7abbf4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637959163847747562%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=TSJ%2BADJv2yT6tcL7UKuCi%2F8t0%2BMYfP%2Fpm7R28KnPHek%3D&reserved=0 > > A diff from the previous version is available at: > https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Frfcdiff%3Furl2%3Ddraft-ietf-bier-te-isis-01&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18da4fa2fc66453333b908da7c7abbf4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637959163847747562%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=HtA2iK%2FdNH551QWCSRfkalgkFnGBgxDbCRkV8wb02Nk%3D&reserved=0 > > > Internet-Drafts are also available by rsync at rsync.ietf.org::internet-drafts > _______________________________________________ BIER mailing list BIER@ietf.org https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Fmailman%2Flistinfo%2Fbier&data=05%7C01%7Chuaimo.chen%40futurewei.com%7C18da4fa2fc66453333b908da7c7abbf4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637959163847747562%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ckO%2BMbPLkwS%2BolWb712m%2FTHyvK0gG9SGSxHj%2BuCSe%2BQ%3D&reserved=0
- [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt internet-drafts
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Toerless Eckert
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… zhang.zheng
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Acee Lindem (acee)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Acee Lindem (acee)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Acee Lindem (acee)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… zhang.zheng
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Toerless Eckert
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Jeffrey (Zhaohui) Zhang
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Jeffrey (Zhaohui) Zhang
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Toerless Eckert
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Les Ginsberg (ginsberg)
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Toerless Eckert
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Huaimo Chen
- Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01… Toerless Eckert