Re: [Roll] Question on Multi-Homing in RPL

[Michael Richardson <mcr at sandelman.ca>]

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>>>>> "Don" == Don Sturek <d.sturek at att.net> writes:
    Don> A question on RPL -03:   Is Multi-Homing supported?  Here is
    Don> the use case: 

(SmartMeter + ISP) situation described.
This is a scenario that I think is completely valid.

    Don> Here are the questions:

    Don> 1)       Within a DAG, could devices be Multi-Homed or are they
    Don> required to have a single prefix?

I think they have to have a single prefix.

    Don> 2)      Are there any limitations or suggestions on how address
    Don> assignment should be handled with respect to the two prefix
    Don> address spaces. 

I'm not sure if you asking about whether the prefixes have to be
coordinated, or if you asking if the assignments within each prefix
needs to be coordinated.

    Don> 3)      If we would like the same devices to be able to
    Don> communicate to the 
    Don> meter/headend and then also to the internet via the customers
    Don> ISP, would: 

    Don> a.       There need to be DAGs supporting separate prefix
    Don> addresses? 

I think the device needs to associate to two DAGs.

    Don> b.      Can the devices in a single DAG support multihomed
    Don> devices?  Would all devices in a given DAG need to be
    Don> multihomed the same way? 

I think all the devices involved would need to join multiple DAGs.
Some of them might not be able to, and would have to pick one or the
other.  If they are owned/controlled by utility, I imagine it likely
they would prefer the meter route.

- -- 
]       He who is tired of Weird Al is tired of life!           |  firewalls  [
]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
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