[RTG-DIR] Rtgdir last call review of draft-ietf-teas-actn-info-model-07

Min Ye <amy.yemin@huawei.com> Fri, 27 April 2018 06:44 UTC

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Subject: [RTG-DIR] Rtgdir last call review of draft-ietf-teas-actn-info-model-07
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Reviewer: Eric Gray
Review result: Has Issues


I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related drafts
as they pass through last call and IESG review. The purpose of the review is to
provide assistance to the Routing ADs. For more information about the Routing
Directorate, please see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it would
be helpful if you could consider them along with any other Last Call comments
that you receive, and strive to resolve them through discussion or by updating
the draft.

Document: draft-ietf-teas-actn-info-model
Reviewer: Eric Gray
Review Date: April 27, 2018
LC End Date: April 27, 2018
Intended Status: Informational

Draft Status: Almost ready with minor issues and NITs.

Note: this is not a YANG technical review.

Minor Issues / Questions:
As a general minor question, when instantiating  a topology including only
member information, is it assumed that - given a list of members - each member
is bi-directionally connected to every other member, are end-to-end member
connections pairwise (e.g. - allowing setup of a hub and spoke topology), or is
it necessary/possible to define directionality (e.g. - allowing setup of a
distribution tree)?

Note: This should probably be explicitly stated, though section 5.3 seems to
imply that both connectivity and directionality are supported (at least the way
I read it).

Section 3, top of page 6: while this draft is intended to be informational and
does not refer to RFC 2119, the wording "at a minimum" and "should be
supported" is inconsistent (or arguably redundant).  I recommend omitting the
1st part ("At a minimum,") making the sentence read instead "The following VN
Action ..." A similar issue applies to the 2nd paragraph in section 4.

Section 3.2, VN Modify: It looks as if this section needs to include text
similar to that in section 3.4, given the possible topology types described in
section 3.1.  In addition, you may want to restrict what is allowed in a VN
Modify to actions consistent with the VN topology type previously instantiated.

Section 3.6, VN Query: In addition to certain NITs, this section should make it
clear that the "topology view" returned by VN Query would be consistent with
the topology type instantiated for any specific VN.

Section 4, Traffic Engineering (TE) primitives: Does it make sense that the TE
actions should be supported at the MPI consistently with the type of topology
defined at the CMI, or are they independent?  Section 4.4 seems to imply that
consistency is expected.

Section 5.2, VN Service Characteristics: in the shared risk discussion (towards
the top of page 12), it is difficult to indicate (with any accuracy) what the
shared risks are for a topology type consisting of just a list of members.  Is
this limited to topologies of the type that includes (virtual) link and node

Section 5.4, 1st sentence: VN Member is not equal to end-to-end tunnel.  I
suspect you mean "VN member pair."

In several sections, the use of capitalization is inconsistent in the section
titles that include the word "primitives."  See sections 3, 4, 7 and 8 in the
ToC and in the text.

In the paragraph under Figure 1, "there of" should be one word ("thereof").

Same paragraph, "MDSC to MSDC" should be "MDSC to MDSC" (referring to a
hierarchy of MDSCs).

Section 2, 1st line: "provides ACTN common ..." should be "provides an ACTN
common ..."

Section 3.6, 1st paragraph: there are minor grammar issues with the entire
paragraph.  I suggest rewording along lines as follows (minimal change):

"VN Query refers to an inquiry pertaining to a VN that has already been
instantiated.  VN Query fulfills a pull model that permits getting a topology

Note: see related minor issue above.

Section 4, 1st line: "... list of main ..." should be "... list of the main ..."

Section 5.2, toward the middle of page 11: "... for the required the service
..." should be "... for the required service ..."  In the very next sentence,
"constrains" should be "constraints" and "VN Constrains" should be "VN

Section 5.3, bottom of page 13: "Access point identifier ..." should be "Access
Point Identifier ..." In the next sentence, "creation" should probably be

Section 5.3, top of page 14: "... his own ..." should be "... their own ..."

Section 5.6, last sentence in 1st paragraph: should be reworded as:

"... is composed of virtual nodes and virtual links." ("is comprised of" is an
incorrect, idiomatic, usage, and "virtual" and "and" need to be shifted around).

Section 5.7.1, 1st sentence: "from higher controller" should "from a higher

Toward bottom of page 18: "Set Priority ... priority to taking ..." should be
"Set Priority ... priority for taking ..."

Section 9, 2nd sentence in 1st paragraph: "confidentially" should be
"confidentiality" Same section, 2nd paragraph "... regardless these ..." should
be "... regardless of whether these ..."