On Wed, 30 Jul 2014, Charles Polisher wrote:
David Lang wrote:
Paul Graydon wrote:
The thing is that there is no such thing as a one-direction fiber,
and even the interfaces speeds are symmetrical once you get outside
of the last-mile.
So it doesn't cost Verizon/Layer3/Netflix any more or less to have
the connections fully utilized in one direction and idle in the
other direction than to have them fully utilized in both directions.
Won't more traffic compete for resources on the connecting
router? For example buffers (data-plane) and routing/forwarding
resources (control plane)? Wouln't that affect throughput?
Potentially cost more?
the routing is already setup for the connection, and a lot of this can be done
directly in the ASIC. Since it's using a direction that would otherwise be idle
the question of if it would impact the router CPU load is far from clear.
There's also the question of if the router CPU/backplanes are the limiting
factor or if the wire speed is the limiting factor.
Back in the day it was easy to add more bandwidth in connectors than the
backplane could support, but with the increases in processing I'm not sure that
remains the case.
For what it's worth, the claims that it's unfair for the bandwith to be so
asymmetrical tend to reinforce that for me :-) But I haven't had to work with
that class of devices for a couple years now.
David Lang
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