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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Huaimo - In order to support a variable length bit field, you will need to change th= e format of the sub-TLV. So, while you may not need to support more larger = scale today, you do not want to standardize a format that will have to be c= hanged. I think you need to revise the format now. And if you are advertising a bit= string, this could become quite large. RFC 8296 defines support for up to = 4K bits - which would require 512 bytes - not feasible in IS-IS in a 255 by= te TLV. I suggest you advertise this as a 0-based bit number. This means that a 16 = bit field (2 octets) is sufficient to cover Bits 0-65535. I also question why you need to include the DisEndBitPosition. For this to = be correct, it needs to match the value locally assigned on the DIS - which= means it is safer to retrieve the value from the corresponding advertiseme= nt by the DIS itself. Otherwise, the non-DIS nodes would have to update their advertisements when= ever they see a change in what is advertised by the DIS. This is not desira= ble. So the sub-TLV format becomes: Type: 1 octet Length: 1 octet sub-domain-id: 1 octet BAR: 1 octet IPA: 1 octet BitNumber : 2-octets Specifies the local bit position (0 based) assigned t= o this link/neighbor Les From: BIER On Behalf Of Huaimo Chen Sent: Monday, August 8, 2022 8:04 AM To: Les Ginsberg (ginsberg) ; Les Ginsberg (ginsberg) <= ginsberg=3D40cisco.com@dmarc.ietf.org>; bier@ietf.org Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt Hi Les, Thanks much for your question. My answer is inline below with [HC2]. Best Regards, Huaimo ________________________________ From: Les Ginsberg (ginsberg) > Sent: Wednesday, August 3, 2022 9:58 AM To: Huaimo Chen >; Les Ginsberg (ginsberg) >; bier@ietf.org= > Subject: RE: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt Huaimo - Thanx for addressing my comments so quickly. Changes look fine - but I do have one question. You eliminated the text: > "Note that if each of BitPosition > and DrEndBitPosition uses more than 2 octets, we use 4 or more octets > for each of them." Does this mean you have no need to ever support more than 16 bits in these = fields?? [HC2]: It should be ok for now. For scalability, there is a need for suppor= ting more than 16 bits in these fields. Les > -----Original Message----- > From: BIER > On Behal= f Of Huaimo Chen > Sent: Tuesday, August 2, 2022 7:59 PM > To: Les Ginsberg (ginsberg) >; > bier@ietf.org > Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt > > Hi Les, > > Thank you very much for your valuable comments. > I have addressed them in the updated draft (uploaded). > My responses are also inline below with [HC]. > > Best Regards, > Huaimo > -----Original Message----- > From: BIER > On Behal= f Of Les Ginsberg (ginsberg) > Sent: Friday, July 29, 2022 4:59 PM > To: bier@ietf.org > Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt > > Some pedantic comments on this draft: > > For the new BIER-TE sub-TLV: > > 1)The relevant registry has been renamed to be "IS-IS Sub-TLVs for TLVs > Advertising Neighbor Information". Please use this new name. > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww > w.iana.org%2Fassignments%2Fisis-tlv-codepoints%2Fisis-tlv- > codepoints.xhtml%23isis-tlv-codepoints-advertising-neighbor- > information&data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5b > bd38c256024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc% > 7C1%7C0%7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi > MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300 > 0%7C%7C%7C&sdata=3DybC6zOJkG1sRe%2FQosV23MElysXHkg7jnHS70N > %2Bf7bpE%3D&reserved=3D0 > [HC]: I have renamed it as you suggested. > > 2)Please do NOT insert padding to keep content aligned on a 4 byte > boundary. This may be useful for OSPF, but it is not for IS-IS as TLVs ar= e NOT > aligned inside an LSP. All you are doing is wasting space - which is prec= ious in > IS-IS given the limited LSP space. > [HC]: Removed padding. > > 3)You say in Section 2: > > "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 see how the receiver of the sub-TLV could tell whether the 2 oct= et or > 4 octet encoding was sent as you have nothing that specifies the length o= f > these fields. > You can't use the total length of the sub-TLV as it could include optiona= l sub- > sub-TLVs. > > ?? > [HC]: Deleted the quoted text. > > 4)In IANA section, I do not know why you specified "N" for TLVs 23 and 22= 3. > While RFC 5311 (which defines these TLVs) is not popular, if there was an > implementation, I see no reason why it should be invalid to send the BIER= -TE > info in these TLVs. > [HC]: Changed "n" to "y" for TLVs 23 and 223. > > Thanx. > > Les > > > > -----Original Message----- > > From: BIER > On Beh= alf Of internet-drafts@ietf.org > > Sent: Friday, July 29, 2022 12:13 PM > > To: i-d-announce@ietf.org > > Cc: bier@ietf.org > > Subject: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt > > > > > > 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=3Dhttps%3A%2F%2Fdata > tracker.ietf.org%2Fdoc%2Fdraft-ietf-bier-te- > isis%2F&data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38 > c256024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1 > %7C0%7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC > 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000% > 7C%7C%7C&sdata=3D99ojCa2m%2BTeMk0OfxeifsmVrhvNaK7jQJp0fu0syR > N8%3D&reserved=3D0 > > > > There is also an htmlized version available at: > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata > tracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-bier-te-isis- > 01&data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38c256 > 024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > %7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA > wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C > %7C&sdata=3D%2F8qaH0ZvQBAfGM4WIre0jpcI6As7wjXjdqbxOfdGHxo%3 > D&reserved=3D0 > > > > A diff from the previous version is available at: > > > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww > w.ietf.org%2Frfcdiff%3Furl2%3Ddraft-ietf-bier-te-isis- > 01&data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38c256 > 024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0 > %7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA > wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C > %7C&sdata=3DL77o0dGWGuSwL9vSm1Durc56Fl5zONoDq%2F8ij12v9lc%3D > &reserved=3D0 > > > > > > 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=3Dhttps%3A%2F%2Fww > w.ietf.org%2Fmailman%2Flistinfo%2Fbier&data=3D05%7C01%7Chuaimo.c > hen%40futurewei.com%7C5bbd38c256024261ea5608da71a546c0%7C0fee8ff > 2a3b240189c753a1d5591fedc%7C1%7C0%7C637947251926210034%7CUnkno > wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1 > haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3Dem5K2lvVvXwkSl > ye1egSX%2BgtdfeqDArSsAycQJTPArI%3D&reserved=3D0 > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww > w.ietf.org%2Fmailman%2Flistinfo%2Fbier&data=3D05%7C01%7Chuaimo.c > hen%40futurewei.com%7C5bbd38c256024261ea5608da71a546c0%7C0fee8ff > 2a3b240189c753a1d5591fedc%7C1%7C0%7C637947251926210034%7CUnkno > wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1 > haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3Dem5K2lvVvXwkSl > ye1egSX%2BgtdfeqDArSsAycQJTPArI%3D&reserved=3D0 > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.i= etf.org%2Fmailman%2Flistinfo%2Fbier&data=3D05%7C01%7Chuaimo.chen%40futu= rewei.com%7C95a42958ed4c41fff26d08da75584150%7C0fee8ff2a3b240189c753a1d5591= fedc%7C1%7C0%7C637951319188884952%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM= DAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata= =3DP0k112aaXc4zEAnMqv70xk73K2vaqz2LobVCFQyuei0%3D&reserved=3D0 --_000_BY5PR11MB43375BE7F1673E55B147451DC1639BY5PR11MB4337namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Huaimo –

 

In order to support a variable length bit field, you= will need to change the format of the sub-TLV. So, while you may not need = to support more larger scale today, you do not want to standardize a format= that will have to be changed.

I think you need to revise the format now. And if yo= u are advertising a bit string, this could become quite large. RFC 8296 def= ines support for up to 4K bits – which would require 512 bytes –= ; not feasible in IS-IS in a 255 byte TLV.

I suggest you advertise this as a 0-based bit number= . This means that a 16 bit field (2 octets) is sufficient to cover Bits 0-6= 5535.

 

I also question why you need to include the DisEndBi= tPosition. For this to be correct, it needs to match the value locally assi= gned on the DIS – which means it is safer to retrieve the value from = the corresponding advertisement by the DIS itself.

Otherwise, the non-DIS nodes would have to update th= eir advertisements whenever they see a change in what is advertised by the = DIS. This is not desirable.

 

So the sub-TLV format becomes:

 

Type:  1 octet

Length:  1 octet

sub-domain-id:  1 octet

BAR:  1 octet

IPA:  1 octet

BitNumber :  2-octets Specifies the local bit p= osition (0 based) assigned to this link/neighbor

 

 

   Les

 

From: BIER <bier-bounces@ietf.org> O= n Behalf Of Huaimo Chen
Sent: Monday, August 8, 2022 8:04 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; Les Ginsberg= (ginsberg) <ginsberg=3D40cisco.com@dmarc.ietf.org>; bier@ietf.org Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt<= /o:p>

 

Hi Les,=

&n= bsp;

  =   Thanks much for your question.

  =   My answer is inline below with [HC2].

&n= bsp;

Best Re= gards,

Huaimo<= o:p>

From: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Sent: Wednesday, August 3, 2022 9:58 AM
To: Huaimo Chen <hua= imo.chen@futurewei.com>; Les Ginsberg (ginsberg) <ginsberg=3D40cisco.com@dmarc.ietf= .org>; bier@ietf.org <bier@ietf.org>
Subject: RE: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt

 

Huaimo -

Thanx for addressing my comments so quickly.

Changes look fine - but I do have one question.

You eliminated the text:

> "Note that if each of BitPosition
>    and DrEndBitPosition uses more than 2 octets, we use= 4 or more octets
>    for each of them."

Does this mean you have no need to ever support more than 16 bits in these = fields??

[HC2]: It should be ok for now. For scalability, the= re is a need for supporting more than 16 bits in these fields.

   Les

> -----Original Message-----
> From: BIER <bier-bounces@i= etf.org> On Behalf Of Huaimo Chen
> Sent: Tuesday, August 2, 2022 7:59 PM
> To: Les Ginsberg (ginsberg) <ginsberg=3D40cisco.com@dmarc.ietf.org>;
> bier@ietf.org
> Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
>
> Hi Les,
>
>     Thank you very much for your valuable comments= .
>     I have addressed them in the updated draft (up= loaded).
>     My responses are also inline below with [HC].<= br> >
> Best Regards,
> Huaimo
> -----Original Message-----
> From: BIER <bier-bounces@i= etf.org> On Behalf Of Les Ginsberg (ginsberg)
> Sent: Friday, July 29, 2022 4:59 PM
> To: bier@ietf.org
> Subject: Re: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
>
> Some pedantic comments on this draft:
>
> For the new BIER-TE sub-TLV:
>
> 1)The relevant registry has been renamed to be "IS-IS Sub-TLVs fo= r TLVs
> Advertising Neighbor Information". Please use this new name.
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww<= br> > w.iana.org%2Fassignments%2Fisis-tlv-codepoints%2Fisis-tlv-
> codepoints.xhtml%23isis-tlv-codepoints-advertising-neighbor-
> information&amp;data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5b<= br> > bd38c256024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%
> 7C1%7C0%7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi
> MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300
> 0%7C%7C%7C&amp;sdata=3DybC6zOJkG1sRe%2FQosV23MElysXHkg7jnHS70N
> %2Bf7bpE%3D&amp;reserved=3D0
> [HC]: I have renamed it as you suggested.
>
> 2)Please do NOT insert padding to keep content aligned on a 4 byte
> boundary. This may be useful for OSPF, but it is not for IS-IS as TLVs= are NOT
> aligned inside an LSP. All you are doing is wasting space - which is p= recious in
> IS-IS given the limited LSP space.
> [HC]: Removed padding.
>
> 3)You say in Section 2:
>
> "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 see how the receiver of the sub-TLV could tell whether the 2 = octet or
> 4 octet encoding was sent as you have nothing that specifies the lengt= h of
> these fields.
> You can't use the total length of the sub-TLV as it could include opti= onal sub-
> sub-TLVs.
>
> ??
> [HC]: Deleted the quoted text.
>
> 4)In IANA section, I do not know why you specified "N" for T= LVs 23 and 223.
> While RFC 5311 (which defines these TLVs) is not popular, if there was= an
> implementation, I see no reason why it should be invalid to send the B= IER-TE
> info in these TLVs.
> [HC]: Changed "n" to "y" for TLVs 23 and 223.
>
> Thanx.
>
>     Les
>
>
> > -----Original Message-----
> > From: BIER <bier-boun= ces@ietf.org> On Behalf Of internet-drafts@ietf.org > > Sent: Friday, July 29, 2022 12:13 PM
> > To: i-d-announce@ietf.or= g
> > Cc: bier@ietf.org
> > Subject: [Bier] I-D Action: draft-ietf-bier-te-isis-01.txt
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Draft= s
> directories.
> > This draft is a work item of the Bit Indexed Explicit Replication= WG of the
> IETF.
> >
> >         Title  =          : IS-IS Extensions for BIE= R-TE
> >         Authors &nbs= p;       : Huaimo Chen
> >           =             &nb= sp;   Mike McBride
> >           =             &nb= sp;   Aijun Wang
> >           =             &nb= sp;   Gyan S. Mishra
> >           =             &nb= sp;   Yanhe Fan
> >           =             &nb= sp;   Lei Liu
> >           =             &nb= sp;   Xufeng Liu
> >   Filename        : = draft-ietf-bier-te-isis-01.txt
> >   Pages        =    : 7
> >   Date        &= nbsp;   : 2022-07-29
> >
> > Abstract:
> >    This document describes IS-IS extensions for di= stributing
> >    BitPositions configured on the links in "B= it Index Explicit
> >    Replication Traffic Engineering" (BIER-TE)= domain.
> >
> >
> >
> > The IETF datatracker status page for this draft is:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata
> tracker.ietf.org%2Fdoc%2Fdraft-ietf-bier-te-
> isis%2F&amp;data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38<= br> > c256024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1
> %7C0%7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC
> 4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%
> 7C%7C%7C&amp;sdata=3D99ojCa2m%2BTeMk0OfxeifsmVrhvNaK7jQJp0fu0syR > N8%3D&amp;reserved=3D0
> >
> > There is also an htmlized version available at:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata
> tracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-bier-te-isis-
> 01&amp;data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38c256 > 024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0
> %7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA
> wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C
> %7C&amp;sdata=3D%2F8qaH0ZvQBAfGM4WIre0jpcI6As7wjXjdqbxOfdGHxo%3 > D&amp;reserved=3D0
> >
> > A diff from the previous version is available at:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww<= br> > w.ietf.org%2Frfcdiff%3Furl2%3Ddraft-ietf-bier-te-isis-
> 01&amp;data=3D05%7C01%7Chuaimo.chen%40futurewei.com%7C5bbd38c256 > 024261ea5608da71a546c0%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0
> %7C637947251926210034%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjA
> wMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C
> %7C&amp;sdata=3DL77o0dGWGuSwL9vSm1Durc56Fl5zONoDq%2F8ij12v9lc%3D > &amp;reserved=3D0
> >
> >
> > Internet-Drafts are also available by rsync at rsync.ietf.org::in= ternet-drafts
> >
> >
> > _______________________________________________
> > BIER mailing list
> > BIER@ietf.org
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fww<= br> > w.ietf.org%2Fmailman%2Flistinfo%2Fbier&amp;data=3D05%7C01%7Chuaimo= .c
> hen%40futurewei.com%7C5bbd38c256024261ea5608da71a546c0%7C0fee8ff
> 2a3b240189c753a1d5591fedc%7C1%7C0%7C637947251926210034%7CUnkno
> wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1
> haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=3Dem5K2lvVvXwkSl
> ye1egSX%2BgtdfeqDArSsAycQJTPArI%3D&amp;reserved=3D0
>
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