Re: [Idr] [Bier] I-D Action: draft-ietf-bier-bgp-ls-bier-ext-00.txt

Greg Mirsky <gregimirsky@gmail.com> Tue, 11 April 2017 20:29 UTC

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 11 Apr 2017 13:29:24 -0700
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To: chen.ran@zte.com.cn, draft-ietf-bier-bgp-ls-bier-ext@ietf.org
Cc: bier@ietf.org, idr@ietf.org
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Subject: Re: [Idr] [Bier] I-D Action: draft-ietf-bier-bgp-ls-bier-ext-00.txt
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Hi Ran, Authors,
thank you for the very good and timely work. Please kindly consider my
notes to the draft:

   - section 3.1
      - for consistency of format definition add Type with reference to the
      appropriate sub-section in IANA Considerations;
      - add definition of the value in Length field, e.g. "equals number of
      octets of the Value field";
      - you may describe the Reserved field and note that is MUST be set to
      0 on transmit and ignored on receipt;
      - I think that meaning and use of subdomain-id and MT-ID need more
      discussion. E.g., how these id's assigned, managed? What they signify?
      - how the value of BSL field defined? Is it the same as Len field in
      the BIER Header (Section 3 in
draft-ietf-bier-mpls-encapsulation)? You may
      add the reference to encaps draft.
      - I think that Set Identifier (SI) should be included in the BIER
      TLV. According to Section 3 of the BIER Architecture document,
SI value may
      be in the [0, 255] range. Then one octet seems sufficient for SI field.
      - I'd suggest to keep format to four octet alignment and add reserved
      field after the BFR-id field.
   - Section 3.1.1
      - you can add reference to the sub-section in IANA Considerations for
      Type field;
      - add definition of the value of Length field;
      - is 255 range sufficient for Label Range advertisement?Is it because
      SI is limited to 255? Would be helpful to clarify;
      - would BS Length in the sub-TLV be the same as BSL field in the BIER
      TLV?

Regards,
Greg

On Thu, Apr 6, 2017 at 7:44 PM, <chen.ran@zte.com.cn> wrote:

> Hello all,
>
> We would like to request comments on the draft
>
> https://datatracker.ietf.org/doc/html/draft-ietf-bier-bgp-ls-bier-ext
>
>
> We would really appreciate any comments and questions about the draft.
>
>
> Best Regards.
>
> Ran
>
>
> 原始邮件
> *发件人:* <internet-drafts@ietf.org>;
> *收件人:* <i-d-announce@ietf.org>;
> *抄送人:* <bier@ietf.org>;
> *日 期 :*2017年01月19日 00:26
> *主 题 :**[Bier] I-D Action: draft-ietf-bier-bgp-ls-bier-ext-00.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 of the IETF.
>
>         Title           : BGP Link-State extensions for BIER
>         Authors         : Ran Chen
>                           Zheng Zhang
>                           Vengada Prasad Govindan
>                           IJsbrand Wijnands
>     Filename        : draft-ietf-bier-bgp-ls-bier-ext-00.txt
>     Pages           : 8
>     Date            : 2017-01-10
>
> Abstract:
>    Bit Index Explicit Replication (BIER) is an architecture that
>    provides optimal multicast forwarding through a "BIER domain" without
>    requiring intermediate routers to maintain any multicast related per-
>    flow state.  BIER also does not require any explicit tree-building
>    protocol for its operation.  A multicast data packet enters a BIER
>    domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the
>    BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs).
>    The BFIR router adds a BIER header to the packet.  The BIER header
>    contains a bitstring in which each bit represents exactly one BFER to
>    forward the packet to.  The set of BFERs to which the multicast
>    packet needs to be forwarded is expressed by setting the bits that
>    correspond to those routers in the BIER header.
>
>    This document specifies extensions to the BGP Link-state address-
>    family in order to advertising BIER information.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-bier-bgp-ls-bier-ext/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-bier-bgp-ls-bier-ext-00
>
>
> 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.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
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>
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