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Re: [ippm] Quick comment on draft-ietf-ippm-ioam-data-11

"Frank Brockners (fbrockne)" <fbrockne@cisco.com> Wed, 06 January 2021 17:14 UTC

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From: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>
To: "xiao.min2@zte.com.cn" <xiao.min2@zte.com.cn>, "ippm@ietf.org" <ippm@ietf.org>
CC: "shwetha.bhandari@gmail.com" <shwetha.bhandari@gmail.com>
Thread-Topic: [ippm] Quick comment on draft-ietf-ippm-ioam-data-11
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Date: Wed, 06 Jan 2021 17:14:20 +0000
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Subject: Re: [ippm] Quick comment on draft-ietf-ippm-ioam-data-11
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Hi Xiao Min,

the 7-bit wide registry for IOAM-Option-Types is because some protocols, like e.g. Geneve, only offer room for 7 bits.
See https://tools.ietf.org/html/draft-brockners-ippm-ioam-geneve-05#section-3
“   Type:  8-bit field defining the IOAM Option type, as defined in
      Section 7.2 of [I-D.ietf-ippm-ioam-data].  The 'C' bit MUST be set
      to zero.”

This requirement drove the change from 8 to 7 bits – back in March 2018, see:
https://github.com/inband-oam/ietf/commit/22b33b12863fa62dd80d47a00b859bce82b69e60
“IOAM-Type code point reduced from 256 -> 128 to handle encaps like Geneve where top bit in type reserved.”
(Thanks to Shwetha for digging up the reference).

Cheers, Frank

From: ippm <ippm-bounces@ietf.org> On Behalf Of xiao.min2@zte.com.cn
Sent: Dienstag, 5. Januar 2021 03:34
To: ippm@ietf.org
Subject: [ippm] Quick comment on draft-ietf-ippm-ioam-data-11


Hi authors,

While updating "IOAM over BIER" draft, I noticed that in Section 8.1 of IOAM-Data draft 128 code points are defined for IOAM Option-Type Registry, nevertheless in whether draft-ietf-ippm-ioam-ipv6-options or draft-ietf-sfc-ioam-nsh, IOAM Type is an 8-bit field, could 256 code points instead of 128 code points be defined?

Best Regards,
Xiao Min

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