Re: [mpls] Adam Roach's Discuss on draft-ietf-mpls-spring-lsp-ping-11: (with DISCUSS and COMMENT)
"Carlos Pignataro (cpignata)" <cpignata@cisco.com> Thu, 12 October 2017 00:42 UTC
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Adam Roach <adam@nostrum.com>
CC: The IESG <iesg@ietf.org>, "draft-ietf-mpls-spring-lsp-ping@ietf.org" <draft-ietf-mpls-spring-lsp-ping@ietf.org>, Loa Andersson <loa@pi.nu>, "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: Adam Roach's Discuss on draft-ietf-mpls-spring-lsp-ping-11: (with DISCUSS and COMMENT)
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Date: Thu, 12 Oct 2017 00:42:32 +0000
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Subject: Re: [mpls] Adam Roach's Discuss on draft-ietf-mpls-spring-lsp-ping-11: (with DISCUSS and COMMENT)
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Hi, Adam, You found a nice bug. Thank you! Please see inline. > On Oct 11, 2017, at 6:44 PM, Adam Roach <adam@nostrum.com> wrote: > > Adam Roach has entered the following ballot position for > draft-ietf-mpls-spring-lsp-ping-11: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-mpls-spring-lsp-ping/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > Section 5.3 indicates that "Advertising Node Identifier" and "Receiving Node > Identifier" are "4 or 6 octets." There are two issues that arise with the way > this is currently specified, both of which can lead to a lack of > interoperability: Indeed. This text, which is included both in the Advertising and Receiving Node ID, needs fixing. In summary, Protocol 0 needs specification of the length and value, and Protocol 1 needs to disambiguate the length. > > 1. While implementors might infer that "Protocol=1" results in a 4-byte value, > and that "Protocol=2" results in a 6-byte value, it's a bit unclear what length > is to be used here for "Protocol=0.” Indeed. For Protocol=0, there’s little we can glean. See text below. > > 2. The descriptions for both of these fields include: "When Protocol is set to > 1, then the 32 rightmost bits represent OSPF Router ID." This implies that the > field is *wider* than 32 bits when Protocol=1, which leaves deep ambiguity > about the circumstances under which the field is allowed to be 4 octets. Correct. Meaning, you are correct and the text is incorrect. Protocol=1, 4-octet field, 32-bit OSPF Router-ID. Will fix. See below. > > I would strongly recommend that this section add clear language that > unambiguously spells out how implementations are expected to select the field > width for the four variable-width fields in this Sub-TLV (the two I cite above > as well as the interface ID fields). > Yes. New text: Local Interface ID An identifier that is assigned by the local LSR for a link to which Adjacency Segment ID is bound. This field is set to a local link address (IPv4 or IPv6). For IPv4, this field is 4 octets; for IPv6, this field is 16 octets. In case of unnumbered, this field is 4 octets and includes a 32 bit link identifier as defined in [RFC4203], [RFC5307]. If the Adjacency Segment ID represents parallel adjacencies ([I-D.ietf-spring-segment-routing]), this field is 4 octets and MUST be set to 4 octets of zeroes. … Advertising Node Identifier It specifies the advertising node identifier. When Protocol is set to 1, then this field is 4 octets and carries the 32-bit OSPF Router ID; if Protocol is set to 2, then this field is 6 octets and carries the 48-bit ISIS System ID; if Protocol is set to 0, then this field is 4 octets, and MUST be set to zero. Receiving Node Identifier It specifies the downstream node identifier. When Protocol is set to 1, then this field is 4 octets and carries the 32-bit OSPF Router ID; if Protocol is set to 2, then this field is 6 octets and carries the 48-bit ISIS System ID; if Protocol is set to 0, then this field is 4 octets, and MUST be set to zero. Thoughts? Other comments? > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Sections 5.1, 5.2, and 5.3 define "Reserved" fields without indication of how > these fields should be treated. Recommend each of these be defined to "MUST be > set to 0 on send, MUST be ignored on receipt" -- this is the scheme that > maximizes the ability to use them in the future. > Correct. New text: Reserved MUST be set to 0 on send, and MUST be ignored on receipt. In the three sections. > Section 5.3 sefines three values for "Adj Type": 0, 4, and 6. Please either > state that all other values are and will always be an error, or create an IANA > registry for this field. Done as per Alvaro’s COMMENT. > > Section 5.3 sefines three values for "Protocol": 0, 1, and 2. Please either > state that all other values are and will always be an error, or create an IANA > registry for this field. > > Done as per Alvaro’s COMMENT. Thanks, — Carlos.
- [mpls] Adam Roach's Discuss on draft-ietf-mpls-sp… Adam Roach
- Re: [mpls] Adam Roach's Discuss on draft-ietf-mpl… Carlos Pignataro (cpignata)
- Re: [mpls] Adam Roach's Discuss on draft-ietf-mpl… Adam Roach
- Re: [mpls] Adam Roach's Discuss on draft-ietf-mpl… Carlos Pignataro (cpignata)
- Re: [mpls] Adam Roach's Discuss on draft-ietf-mpl… Carlos Pignataro (cpignata)