Re: [CCAMP] Comments on draft-ietf-ccamp-rsvp-te-srlg-collect-04

OSCAR GONZALEZ DE DIOS <> Fri, 18 July 2014 14:40 UTC

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To: Lou Berger <>, "" <>
Thread-Topic: [CCAMP] Comments on draft-ietf-ccamp-rsvp-te-srlg-collect-04
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Subject: Re: [CCAMP] Comments on draft-ietf-ccamp-rsvp-te-srlg-collect-04
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Hi Lou,

        Lots of thanks for the revision made to the SRLG collection draft.

        We have recently posted a new version addressing the comments mentioned
in your review, and some additional comments.

        The IETF datatracker status page for this draft

        There's also a htmlized version available at:

        A diff from the previous version is available at:

        There are no idnits in the new version, as can be checked in

        The main changes are:

        * No idnits
        * Replace head with ingress
        * Replace tail with egress
        * Section 3 changed to Encodings
        * Added Reserved field in section 3.2
        * Added length in fields in section 3.2
        * Rewording of text at beginning of SRLG Collection procedure.
        * sets to MUST set.
        * which can be carried to which MAY be carried
        * if to when in specific examples
        * some more wording changes
        * "Section 5.3 Compatibility² added
        * References fixed
        * RRO ordering discussed
        * added RFC5420 as a normative reference
        * References in normative /informative

        Authors believe most of the comments have been addressed.

        Best Regards,

                Óscar & draft-ietf-ccamp-rsvp-te-srlg-collect-05 authors.

El 07/05/14 23:53, "Lou Berger" <> escribió:

>    Here are some primarily editorial suggested changes to / comments on
>draft-ietf-ccamp-rsvp-te-srlg-collect-04.  Please use/respond as you
>see appropriate.
>- The draft has a bunch of idnits issues which need to be fixed
>  see
>  (I'll use line numbers from this URL below.)
>- I suggest, in the whole document
>    s/head/ingress
>    s/tail/egress
>- Section 3 title: "RSVP-TE Extensions (Encoding)"
>  The whole document is an RSVP-TE Extensions, so this isn't a very
>  useful section heading.  How about just calling the "Encodings"
>- Section 3.2
>  - Each field should have its length defined
>  - The reserved field needs to be defined
>Section 4.1
>-  lines 179-181:
>   Typically, the head node gets the route information of an LSP by
>    adding a RRO which contains the sender's IP addresses in the Path
>    message.
>  - Given this is defined in RFC209, how about:
>   Per RFC 3209, an ingress initiates the recording of the route
>    information of an LSP by adding a RRO to a Path message.
>- There are places where the section is light on 2119 language:
>  - line 181: s/it sets/it MUST set
>  - line 182: s/which can be carried/which MAY be carried
>- lines 183/4: Given you are describing specific cases, s/if/when in the
>  following:
>   either in an LSP_REQUIRED_ATTRIBUTES Object if the collection is
>   mandatory, or in an LSP_ATTRIBUTES Object if the collection is
>- drop "is" in "...  Collection Flag is set" (lines 188 and 196)
>- you use "should not" in lower case in a few spots in this section.
>  While I think your usage *is* correct, my experience is that someone
>  (probably in the IESG) will tell you that these need to be in upper
>  case at some point.  Of course, they'll be wrong, and this will have
>  to be explained.  I suggest avoiding 2119 language in lower case where
>  easily avoided.  How about s/should not be/is not to be
>- Line 200: " the SRLG sub-object(s) in the Path RRO."
>  How about "any SRLG sub-object(s) in the RRO of the corresponding
>  outgoing Path message."
>- Line 202: s/If/When the Collection Flag is set and
>- Line 203/4:
>  OLD
>       processing node SHOULD add an SRLG sub-object to the RRO to carry
>       local SRLG information.
>  NEW
>       processing node SHOULD add local SRLG information, as defined
>       below, to the RRO of the corresponding outgoing Path message.
>- Line 208: s/forwarding/processing
>- line 210:
>  OLD
>      node can get the SRLG information from the RRO
>  NEW
>       node receives SRLG information in the RRO
>- Lines 212-215 - this needs to be rephrased into language with which an
>  implementation may conform.  How about something like:
>    Per RFC 3209, when issuing a Resv message for a Path message which
>    contains an RRO an egress node initiates the RRO process by adding
>    an RRO to the outgoing Resv message.  The processing for RROs
>    contain in Resv messages then mirrors that of the Path messages.
>- Line 224: s/must not/MUST NOT
>- Lines 225-7
>   Otherwise, if local policy allows to provide the SRLG
>   information, it MUST add an SRLG sub-object to the RRO to carry the
>   SRLG information in the upstream direction.
> New
>   When local policy allows recording SRLG
>   information, the node SHOULD add SRLG information, as defined below,
>   to the RRO of the corresponding outgoing Resv message.
>- Lines 246-250.  I don't think such informative text belongs in this
>  section.  I also think it's redundant with the last paragraph of
>  section 1 so suggest dropping it altogether.
>- The section is missing handling of RRO to big. Perhaps add it at ~line
>  330.
>Section 4.2
> - Line 260: s/need not/SHOULD NOT
>Section 4.3 Compatibility (?)
>- Need a section covering what happens when an existing implementation
>  sees a flag or SO defined in this document.  (Remember, you can't
>  specify their behavior, just say what they should be expected to do
>  based on current RFCs and the objects defined in this document.)
>- Section 5
>  The section doesn't cover the possibility of SRLGs being
>  mapped/changed from/to internal to/from neighbor SRLG values.
>- Section 6
>  Section 5 implies there is a policy decision to be made at border
>  nodes. It seems to me that the security related considerations of this
>  policy decision should be covered in the document. Either in this
>  section or in section 5, in which case this section should point to
>  that discussion.
>- Section 9
>  The references need to be split into informative and normative
>  references.  For example, all but the first two references look
>  informative to me.
>That's it,
>CCAMP mailing list


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