Re: [RRG] Which Side to Control Ingress Link Selection?

[Brian E Carpenter <brian.e.carpenter@gmail.com>]

On 2008-04-16 07:16, Christian Vogt wrote:
>>> Doesn't the issue persist independent of the characteristics based on
>>> which a path gets selected?  Independent of *how* a path gets selected,
>>> you need to decide *who* selects it (or who selects which part of it).
>>
>> Well, that's true of course. But nothing can change the fact
>> that the originating host chooses the source address and destination
>> address that the packet starts out with, and all subsequent choices
>> depend on that.
> 
> Brian,
> 
> fully agree, but my point is that our new routing architecture may give
> more control to the sender:  By selecting a transit address in addition
> to an edge address, the sender will be able to fix an intermediate
> point on the route towards the receiver.  Thereby, it will be able to
> select the ingress link at the receiving edge network.  Today, it is the
> /receiving/ edge network that selects the ingress link -- through BGP.

Well, we'd need to understand why there might be a change to the very
old reluctance to pass any kind of topological knowledge to the host.
Up to now, hosts have been strictly address-driven, and treated the
network as an opaque cloud with no internal topology. Do you think
that will change?

    Brian

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