[auth48] [AD] Re: AUTH48: RFC-to-be 9514 <draft-ietf-idr-bgpls-srv6-ext-14> for your review

[[e-mail]]

Authors and AD*,

*AD, please see question #1 below.

Authors, while reviewing this document during AUTH48, please resolve (as necessary) the following questions, which are also in the XML file.


1) <!-- [rfced] *AD and authors, please let us know if the normative reference to
RFC 7752 should be updated to 7752bis (see
https://datatracker.ietf.org/doc/draft-ietf-idr-rfc7752bis/17/). Note
that 7752bis was previously approved and then put on hold by the AD, but
it is now back in EDIT state. If we update to reference 7752bis, both
this document and RFC-to-be 9513 will be published at the same time as
7752bis.

Note that this document makes allocations in the "BGP-LS NLRI Types" and
"BGP-LS NLRI and Attribute TLVs" registries.  The "BGP-LS NLRI and Attribute
TLVs" registry was called the "BGP-LS Node Descriptor, Link Descriptor, Prefix
Descriptor, and Attribute TLVs" registry in RFC 7752 and changed by
7752bis. The name currently in the IANA registry is "BGP-LS NLRI and
Attribute TLVs". See
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv.

If you choose to retain the reference to RFC 7752, we will use the registry
name in that document ("BGP-LS Node Descriptor, Link Descriptor, Prefix
Descriptor, and Attribute TLVs"). If you choose to wait to publish at the same
time as 7752bis, we will use the updated name ("BGP-LS NLRI and Attribute
TLVs").
-->


2) <!-- [rfced] Please note that the title of the document has been updated as
follows. Abbreviations have been expanded per Section 3.6 of RFC 7322
("RFC Style Guide").

Original:
  BGP Link State Extensions for SRv6

Current:
  Border Gateway Protocol - Link State (BGP-LS) Extensions for Segment Routing over IPv6 (SRv6)
-->


3) <!-- [rfced] Would it be helpful to clarity "a separate document" here? Is
this referring to a particular RFC?

Original:
   The BGP-LS address-family solution for SRv6
   described in this document is similar to BGP-LS for SR for the MPLS
   data-plane defined in a separate document.
-->


4) <!-- [rfced] We see two instances each of the following phrases in this
document. May we update to one form for consistency?
	   
...using Direct as the Protocol-ID
...using Direct Protocol-ID
-->


5) <!-- [rfced] Should "and using" here be updated to either "using" or "and uses"?

Original:
   The SRv6 information pertaining to a node is advertised via the BGP-
   LS Node NLRI and using the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a link is advertised via the BGP-
   LS Link NLRI and using the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a prefix is advertised via the
   BGP-LS Prefix NLRI and using the BGP-LS Attribute TLVs as follows:

Perhaps ("using"):
   The SRv6 information pertaining to a node is advertised via the BGP-
   LS Node NLRI using the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a link is advertised via the BGP-
   LS Link NLRI using the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a prefix is advertised via the
   BGP-LS Prefix NLRI using the BGP-LS Attribute TLVs as follows:

Or ("and uses"):
   The SRv6 information pertaining to a node is advertised via the BGP-
   LS Node NLRI and uses the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a link is advertised via the BGP-
   LS Link NLRI and uses the BGP-LS Attribute TLVs as follows:
   ...
   The SRv6 information pertaining to a prefix is advertised via the
   BGP-LS Prefix NLRI and uses the BGP-LS Attribute TLVs as follows:
-->


6) <!-- [rfced] Please clarify "are identical as specified" here. Is the meaning
that the new MSD types in this document have the same description and
semantics as the MSD types defined in
[I-D.ietf-lsr-isis-srv6-extensions]? Note that this sentence appears
twice in the document.

Original:
   The description and semantics of these new MSD-
   types for BGP-LS are identical as specified in
   [I-D.ietf-lsr-isis-srv6-extensions].

Perhaps:
   The description and semantics of these new MSD-
   types for BGP-LS are identical to those specified in
   [RFC9352].
-->


7) <!-- [rfced] Please clarify "for IGPs, direct, and static configuration" here.

Original:
   *  Local Node Descriptors TLV: set of Node Descriptor TLVs for the
      local node, as defined in [RFC7752] for IGPs, direct, and static
      configuration or as defined in [RFC9086] for BGP protocol.

Perhaps:
   Local Node Descriptors TLV:  Set of Node Descriptor TLVs for the
      local node as defined in [RFC7752] for IGPs, the Direct Protocol-ID,
      and the Static configuration Protocol-ID or as defined in [RFC9086] for BGP.
-->


8) <!-- [rfced] How may we update this text for clarity?

Original:
   For SRv6 SIDs corresponding to BGP EPE and when advertising SRv6 SID
   using Direct Protocol-ID, none are defined currently and they MUST
   be set to 0 when originated and ignored on receipt.
      
Perhaps: 
   No flags are currently defined for SRv6 SIDs corresponding to BGP EPE
   or for advertisement of a SRv6 SID using the Direct Protocol-ID. Flags MUST
   be set to 0 when originated and ignored on receipt.
-->


9) <!-- [rfced] We have updated "SET" to "set" at the end of this
sentence. Please let us know any objections.

Original:
   For SRv6 BGP EPE Peer Set SID,
   multiple instances of this TLV (one for each peer in the "peer set")
   are associated with the SRv6 SID and the S-Flag is SET.
-->


10) <!-- [rfced] Section 9.2: FYI - We have updated the name of the registry in
this section to "BGP-LS NLRI and Attribute TLVs" to match the title
currently in the IANA registry (renamed per
draft-ietf-idr-rfc7752bis). Depending on the response to our question #1,
we will either use the name of the registry per RFC 7752 ("BGP-LS Node
Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs") or
the name per draft-ietf-idr-rfc7752bis ("BGP-LS NLRI and Attribute TLVs").

Link to registry: https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv
-->


11) <!-- [rfced] Please confirm that "set up to routers" is correct. Or should
this be updated to "set up for routers" ("for" instead of "to")? Also, is
the capitaliation of "Link-State" correct?

Original:
   BGP peering sessions for
   address-families other than Link-State may be set up to routers
   outside the SR domain.
-->


12) <!-- [rfced] Terminology

a) We note inconsistencies in the terms below throughout the text. Should
either the closed or open form be used consistently? Or should "PeerSet" and
"PeerNode" be used when followed by "SID", and then "Peer Set" and "Peer Node"
be used elsewhere? We see "PeerSet SID" in RFCs 8402 and 9086, and we see
"PeerNode SID" in RFC 9086.

PeerSet vs. Peer Set

PeerNode vs. Peer Node


b) This relates to the question above. The name of the TLV defined in Section
7.2 is "SRv6 BGP Peer Node SID TLV". Should this be updated to "SRv6 BGP
PeerNode SID TLV" (with "PeerNode" rather than "Peer Node")? If so, we will
ask IANA to update the registry accordingly prior to publication.

Link to registry: https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#srv6-bgp-epe-sid


c) May we update the instance of "peer sessions" in this sentence to "peering
sessions" to match usage elsewhere in the document?

Original:
   ...therefore MAY be assigned to one or more
   End.X SIDs associated with BGP peer sessions.


d) FYI, we updated "SRv6 BGP EPE Peer Node SID TLV" to "SRv6 BGP Peer Node SID TLV"
(no "EPE") for consistency with the name used elswhere in the document.

Original:
   *  The BGP EPE Peer Node context for a PeerNode SID, and the Peer Set
      context for a PeerSet SID [RFC8402] are advertised via the SRv6
      BGP EPE Peer Node SID TLV (Section 7.2),


e) FYI, we updated "OSPFv3 SRv6 LAN End.X sub-TLV" here to "OSPFv3
SRv6 LAN End.X SID sub-TLV" (with "SID") to match usage in Section 9.2 of
RFC-to-be 9513.

Original:
   The information advertised via this TLV is derived from the IS-IS SRv6
   LAN End.X SID sub-TLV (section 8.2 of
   [I-D.ietf-lsr-isis-srv6-extensions]) or the OSPFv3 SRv6 LAN End.X
   sub-TLV (section 9.2 of [I-D.ietf-lsr-ospfv3-srv6-extensions]) in the
   case of IS-IS or OSPFv3 respectively.  
-->


13) <!-- [rfced] Please review the "Inclusive Language" portion of the online
Style Guide
<https://www.rfc-editor.org/styleguide/part2/#inclusive_language> and let
us know if any changes are needed. Note that our script did not flag any
words in particular, but this should still be reviewed as a best
practice.
-->


14) <!-- [rfced] FYI - Expansions for abbreviations have been added upon first use
per Section 3.6 of RFC 7322 ("RFC Style Guide"). Please review each
expansion in the document carefully to ensure correctness.
-->


Thank you.

RFC Editor/mc/rv



On Oct 30, 2023, at 5:05 PM, [e-mail] wrote:

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Updated 2023/10/30

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--------------------------------------
RFC9514 (draft-ietf-idr-bgpls-srv6-ext-14)

Title            : BGP Link State Extensions for SRv6
Author(s)        : G. Dawra, C. Filsfils, K. Talaulikar, M. Chen, D. Bernier, B. Decraene
WG Chair(s)      : Susan Hares, Keyur Patel, Jeffrey Haas

Area Director(s) : Alvaro Retana, John Scudder, Andrew Alston