Re: [mpls] Opsdir last call review of draft-ietf-mpls-sr-over-ip-02
"MORTON, ALFRED C (AL)" <acm@research.att.com> Sun, 17 February 2019 13:46 UTC
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From: "MORTON, ALFRED C (AL)" <acm@research.att.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "ops-dir@ietf.org" <ops-dir@ietf.org>
CC: "mpls@ietf.org" <mpls@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-mpls-sr-over-ip.all@ietf.org" <draft-ietf-mpls-sr-over-ip.all@ietf.org>
Thread-Topic: Opsdir last call review of draft-ietf-mpls-sr-over-ip-02
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Date: Sun, 17 Feb 2019 13:46:19 +0000
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References: <155035125470.28448.13188042604940095760@ietfa.amsl.com> <00ef01d4c6b2$98102420$c8306c60$@olddog.co.uk>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/MXZ6ASxSoySKdLx4UfSFTdNpdMs>
Subject: Re: [mpls] Opsdir last call review of draft-ietf-mpls-sr-over-ip-02
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Thanks Adrian. @OPS-DIR - consider these comments resolved. Al > -----Original Message----- > From: Adrian Farrel [mailto:adrian@olddog.co.uk] > Sent: Sunday, February 17, 2019 6:19 AM > To: MORTON, ALFRED C (AL) <acm@research.att.com>; ops-dir@ietf.org > Cc: mpls@ietf.org; ietf@ietf.org; draft-ietf-mpls-sr-over-ip.all@ietf.org > Subject: RE: Opsdir last call review of draft-ietf-mpls-sr-over-ip-02 > > Hi Al, > > Thanks very much for reviewing. > > Responses in line. > > > Thanks for preparing this draft. > > Providing transition methods is very welcome to > > Operations. > > We aim to please 😊 > > > There seem to be a few more opportunities to employ > > Requirements Language in this draft (currently only > > 3 MUSTs and 2 MAYs), to improve the consistency of > > implementations and subsequent adoption in operations. > > You are right. > The original vision for this document was Informational (telling you how > to use existing tools), so the Requirements language only crept in as we > moved to Standards Track, and we should probably have more of it. > > > For example: > > Section 2: > > o Incremental deployment of the SR-MPLS technology may be > > facilitated by tunneling SR-MPLS packets across parts of a network > > that are not SR-MPLS enabled using an IP tunneling mechanism such > > as MPLS-in-UDP [RFC7510]. The tunnel destination address is the > > ^^^^ > > address of the next SR-MPLS capable node along the path (i.e., the > > egress of the active node segment). This is shown in Figure 1. > > > > Setting the Dst address correctly seems to be a requirement, > > because this material in Section 2 is referenced later, in 3.2.3. > > This seems a reasonable spot for s/is/SHOULD be/ at least. > > Well, in this specific case I'm going to agree with you, but for a > different reason. You don't set a destination address, you pick a tunnel > that has an end point. > > So we should probably write... > OLD > The tunnel destination address is the > address of the next SR-MPLS capable node along the path (i.e., the > egress of the active node segment). > NEW > The tunnel selected MUST have its remote end point (destination) > Address equal to the address of the next SR-MPLS capable node > along the path (i.e., the egress of the active node segment). > END > > > Section 3.1 FIB construction relies on about 5 drafts: > > much work in progress, just noting dependencies (no action) > > Yes, it is sad for me that the SR work still lingers in the pipe. > > > SRGB - ?? spell-out at first use > > Good catch. > Segment Routing Global Block > > > Section 3.2.3. Additional Forwarding Procedures > >.... > > IP Header Fields: When encapsulating an MPLS packet in UDP, the > > resulting packet is further encapsulated in IP for transmission. > > IPv4 or IPv6 may be used according to the capabilities of the > > network. The address fields are set as described in Section 2. > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > The other IP header fields (such as DSCP code point, or IPv6 Flow > > Label) on each UDP-encapsulated segment can be set according to > > ^^^^^^^^^^ > > the operator's policy: > >Suggest: > > s/can be set/SHOULD be configurable/ > > Yes
- [mpls] Opsdir last call review of draft-ietf-mpls… Al Morton
- Re: [mpls] Opsdir last call review of draft-ietf-… Adrian Farrel
- Re: [mpls] Opsdir last call review of draft-ietf-… MORTON, ALFRED C (AL)