On 07/ 6/10 04:24 AM, Daniel Gavelle wrote:
If there are multiple LBR's, with different PIO's, the network still
needs a single CO. For example, a possible Smart Grid network would be
to have: An LBR in the meter with a PIO of the back haul to the utility
and a prefix assigned by the utility. A second LBR in a broadband router
with general access to the Internet and a prefix assigned by an ISP. The
LBRs would need to be configured to cooperate correctly so there is only
one set of context information in the network but each LBR may be
advertising a different PIO.
I am not sure in this case if both LBRs advertise both PIO's or each
advertises its own PIO. If both advertise both PIOs, the optimisation is
lost and the CO needs to be carried explicitly. If each just advertises
its own PIO, there is potential for confusion as two different default
COs may be derived.
The fundamental issues around such deployments are business issues.
Suppose one could get all the technical matters worked out, and then one
day I find that the network is not working. Do I call the Electrical
Company or the ISP? What prevents their support lines from just pointing
fingers at the other company?
On the technical side there are issues even if CO isn't used. For
instance, I expect the service providers to follow best security
practices and do ingress filtering on the source addresses. That means
that if a host picks a source address from the ISP prefix, then those
packets better go out via the ISP's 6LBR, and vice versa.
If we can solve that set of business issues and the ingress filtering
issue, then how to handle CO coordination might fall out as a result; I
would expect any solution to the issues require some coordination
between the Electrical Company and the ISP.
Erik
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