Re: [sfc] Éric Vyncke's Discuss on draft-ietf-sfc-ioam-nsh-11: (with DISCUSS and COMMENT)
"Eric Vyncke (evyncke)" <evyncke@cisco.com> Fri, 05 May 2023 06:08 UTC
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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-sfc-ioam-nsh@ietf.org" <draft-ietf-sfc-ioam-nsh@ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>, "gregory.mirsky@ericsson.com" <gregory.mirsky@ericsson.com>
Thread-Topic: Éric Vyncke's Discuss on draft-ietf-sfc-ioam-nsh-11: (with DISCUSS and COMMENT)
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Date: Fri, 05 May 2023 06:08:03 +0000
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Subject: Re: [sfc] Éric Vyncke's Discuss on draft-ietf-sfc-ioam-nsh-11: (with DISCUSS and COMMENT)
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Hello Frank, Thank you for your reply and addressing all my issues. I am clearing my DISCUSS. Hoping that the review has improved the I-D, regards -éric On 04/05/2023, 22:28, "Frank Brockners (fbrockne)" <fbrockne@cisco.com <mailto:fbrockne@cisco.com>> wrote: Hi Eric, Thanks a lot for your review. We've just posted an updated revision (12): https://www.ietf.org/archive/id/draft-ietf-sfc-ioam-nsh-12.txt <https://www.ietf.org/archive/id/draft-ietf-sfc-ioam-nsh-12.txt> Please see inline below: > -----Original Message----- > From: Éric Vyncke via Datatracker <noreply@ietf.org <mailto:noreply@ietf.org>> > Sent: Tuesday, 2 May 2023 08:47 > To: The IESG <iesg@ietf.org <mailto:iesg@ietf.org>> > Cc: draft-ietf-sfc-ioam-nsh@ietf.org <mailto:draft-ietf-sfc-ioam-nsh@ietf.org>; sfc-chairs@ietf.org <mailto:sfc-chairs@ietf.org>; sfc@ietf.org <mailto:sfc@ietf.org>; > gregory.mirsky@ericsson.com <mailto:gregory.mirsky@ericsson.com>; gregory.mirsky@ericsson.com <mailto:gregory.mirsky@ericsson.com> > Subject: Éric Vyncke's Discuss on draft-ietf-sfc-ioam-nsh-11: (with DISCUSS > and COMMENT) > > Éric Vyncke has entered the following ballot position for > draft-ietf-sfc-ioam-nsh-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/about/groups/iesg/statements/handling-ballot- <https://www.ietf.org/about/groups/iesg/statements/handling-ballot-> > positions/ > for more information about how to handle DISCUSS and COMMENT > positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/ <https://datatracker.ietf.org/doc/draft-ietf-sfc-ioam-nsh/> > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > Thank you for the work put into this document. > > Please find below one blocking DISCUSS points (easy to address), some > non-blocking COMMENT points (but replies would be appreciated even if > only for > my own education), and some nits. > > Special thanks to Greg Mirsky for the shepherd's detailed write-up including > the WG consensus ***and*** the justification of the intended status. > > I hope that this review helps to improve the document, > > Regards, > > -éric > > # DISCUSS (blocking) > > As noted in https://www.ietf.org/blog/handling-iesg-ballot-positions/ <https://www.ietf.org/blog/handling-iesg-ballot-positions/>, a > DISCUSS ballot is just a request to have a discussion on the following topics: > > ## Section 3 > > This is probably due to my lack of knowledge about NSH... So, a simple > discussion over email will probably be enough to clear my DISCUSS points. > > RFC 9197 has an incremental tracing (section 4.4.1), how does it impact the > length of the IOAM header in this case? Assuming that this header size is > increased, I suggest to add some text about increasing the length field of > IOAM > header. ...FB: We added a sentence to section 3 to address this point: In case the IOAM Incremental Trace Option-Type is used, an SFC-aware node that serves as an IOAM transit node, needs to adjust the "IOAM HDR Len" field accordingly, see Section 4.4 in [RFC9197]. > > `When a packet with IOAM is received at an NSH based forwarding node > such as an > Service Function Forwarder (SFF) that does not understand IOAM header, it > SHOULD drop the packet.` is actually a copy of RFC 8300 ``` Packets with > Next > Protocol values not supported SHOULD be silently dropped > by default, although an implementation MAY provide a configuration > parameter to forward them. ``` > and not a new behaviour. So, let's rather be clear and use a structure like > "Per section 2.2 of RFC 8300, ..." followed by the RFC 8300 text. While very > similar to Jim Guichard's DISCUSS point, it is related to another part of the > document. > ...FB: We now make explicit reference to RFC 8300, Section 2.2 - in both cases: The operator MUST ensure that SFC-aware nodes along the Service Function Path support IOAM, otherwise packets might be dropped (see Section 3 further below, as well as [RFC8300] Section 2.2). .... and further below: Per Section 2.2 of [RFC8300], packets with Next Protocol values not supported SHOULD be silently dropped by default. Thus, when a packet with IOAM is received at an NSH based forwarding node such as an Service Function Forwarder (SFF) that does not support the IOAM header, it SHOULD drop the packet. > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > > # COMMENTS (non-blocking) > > ## Section 1 > > Please expand SFF at first use. ...FB: Done. > > ## Section 3 > > Please expand ESP (is it IPsec ESP ?) in the packet format. ...FB: The mention of IPsec ESP is a bit artificial in any case. We kept things generic with just using L2/L3 moving forward. > > Should there be text about the absence of padding in the "IOAM Option and > Optional Data Space" field (assuming that all IOAM options are always in > 32-bit > units)? ..:FB: The section got expanded with a note that there is no need for padding: IOAM Option and Data Space: IOAM-Data-Fields as specified by the IOAM-Type field. IOAM-Data-Fields are defined corresponding to the IOAM-Option-Type (e.g., see Section 4 of [RFC9197] and Section 3.2 of [RFC9326]) and are always aligned by 4 octets, thus there is no padding field. > > ## Section 4 > > `IANA is requested to allocate protocol numbers for the following "NSH > Next > Protocol" related to IOAM` is underspecified. If it is about > https://www.iana.org/assignments/nsh/nsh.xhtml#next-protocol <https://www.iana.org/assignments/nsh/nsh.xhtml#next-protocol>, then > let's be > clear. ...FB: Updated accordingly. > > Note: I intended to DISCUSS this point, but as Jim is already holding a > DISCUSS > on the same point, I will let him to be the owner. > > # NITS (non-blocking / cosmetic) > > A couple of missing hypens in "open source" or "8 bit field". ...FB: Those should be fixed. I hope I caught all of them. Thanks again for your review. Cheers, Frank > >
- [sfc] Éric Vyncke's Discuss on draft-ietf-sfc-ioa… Éric Vyncke via Datatracker
- Re: [sfc] Éric Vyncke's Discuss on draft-ietf-sfc… Frank Brockners (fbrockne)
- Re: [sfc] Éric Vyncke's Discuss on draft-ietf-sfc… Eric Vyncke (evyncke)