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[Roll] Querying PDAO

"Li Zhao (liz3)" <liz3@cisco.com> Wed, 24 July 2019 23:41 UTC

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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Querying PDAO
Thread-Index: AQHVQnldZPEd7kPI0E21cQA8lnfMNg==
Date: Wed, 24 Jul 2019 23:41:49 +0000
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Subject: [Roll] Querying PDAO
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Dear all,

Following up on querying PDAO from root at the meeting today:

It makes sense to provide a querying mechanism for node which can get PDAO from root. Then node can query special PDAO route entry according to its special requirement. For example, route hop, latency, route algorithm, remaining lifetime.

We can enhance DIS to query PDAO if adding a flag in DIO Base Object to identify it is a PDAO query DIS.
And this DIS need to carry a new Control Message Options because existing Control Message can’t identify the requirement.
A possible Control message is as following:

        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 = TBD | Option Length | Prefix Length | alg    | Resvd |

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       |                                                               |

       .                   Target Prefix (Variable Length)             .

       .                                                               .

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       |                        route parameter                        |

       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



alg: route algorithm such as latency/hop limited/common ancestor.
hops/latency/remaining lifetime are some route parameter.

Is it possible to add some text about it?


Best regards,
Li

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