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Re: [Bgp-autoconf] Short comparison of the different documents.

Randy Bush <randy@psg.com> Tue, 17 March 2020 16:48 UTC

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Date: Tue, 17 Mar 2020 09:48:34 -0700
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From: Randy Bush <randy@psg.com>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>
Cc: Jeffrey Haas <jhaas@pfrc.org>, Warren Kumari <warren@kumari.net>, "bgp-autoconf@ietf.org" <bgp-autoconf@ietf.org>
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Subject: Re: [Bgp-autoconf] Short comparison of the different documents.
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jimmy,

i was perhaps a little subtle.  i contend that the attributes are not
decidable by anyone other than the op.

see Attribute List in draft-ymbk-lsvr-l3dl-ulpc

3.  Upper Layer Protocol Configuration PDU

   To communicate parameters required to configure peering and operation
   of Upper Layer Protocols at IP layer 3 and above, e.g., BGP sessions
   on a link, a neutral sub-TLV based Upper Layer Protocol PDU is
   defined as follows:

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |    Type = 9   |                 Payload Length                ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~               |   ULPC Type   |   AttrCount   |               ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~       Attribute List ...      |    Sig Type   | Signature Len ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~               |                 Signature ...                 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The Type and Payload Length are defined in [I-D.ietf-lsvr-l3dl].

   ULPC Type: An integer denoting the type of the uper layer protocol

   0     :  Reserved
   1     :  BGP
   2-255 :  Reserved

   The AttrCount is the number of attribute sub-TLVs in the Attribute
   List.

   The Attribute List is a, possibly null, set of sub-TLVs describing
   the configuration attributes of the specific upper layer protocol.

   An Attribute consists of a one octet Attribute Type, a one octet
   Attribute Length of the number of octets in the Attribute, and a
   Payload of arbitrary length up to 253 octets.

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Attr Type = 1 |    Attr Len   |            Payload            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

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