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Re: [dhcwg] WGLC on draft-ietf-dhc-mac-assign-01

"Bernie Volz (volz)" <volz@cisco.com> Mon, 04 November 2019 18:51 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>, "dhcwg@ietf.org" <dhcwg@ietf.org>
Thread-Topic: [dhcwg] WGLC on draft-ietf-dhc-mac-assign-01
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Date: Mon, 04 Nov 2019 18:51:38 +0000
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Subject: Re: [dhcwg] WGLC on draft-ietf-dhc-mac-assign-01
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Hi:

Ok, yes. Based on RFC8415, we really should put dots here for things that are variable in size.

- Bernie

-----Original Message-----
From: Alexandre Petrescu <alexandre.petrescu@gmail.com> 
Sent: Monday, November 4, 2019 11:53 AM
To: Bernie Volz (volz) <volz@cisco.com>; dhcwg@ietf.org
Subject: Re: [dhcwg] WGLC on draft-ietf-dhc-mac-assign-01



Le 04/11/2019 à 16:17, Bernie Volz (volz) a écrit :
[...]

>> link-layer-len  Specifies the length of the link-layer-address field 
>> (typically 6, for a link-layer-type of 1 (Ethernet)). A two octets 
>> long field.
> 
> But the preceding figure says that the length is 128bits(?) precisely
> - there are no vertical dots, but vertical pipes '|'.  The rest of 
> bits is padding 0s (leading? trailing?)?  MAC addresses longer than
> 128 bits arent accepted?
> 
> BV> 128 is never mentioned explicitly in this document. The figure
> using the vertical pipes in this manner is to say that this is a 
> variable length field

Maybe vertical ellipsis?

OLD:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |          OPTION_LLADDR        |          option-len           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |       link-layer-type         |        link-layer-len         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                                                               |
    |                     link-layer-address                        |
    |                                                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                      extra-addresses                          |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                      valid-lifetime                           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    .                                                               .
    .                      LLaddr-options                           .
    .                                                               .
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


NEW:
     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |          OPTION_LLADDR        |          option-len           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |       link-layer-type         |        link-layer-len         |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                     link-layer-address                        |
    .                                                               .
    .                                                               .
    .                                                               .
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                      extra-addresses                          |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |                      valid-lifetime                           |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    .                                                               .
    .                      LLaddr-options                           .
    .                                                               .
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Alex

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