You want to speed things up faster than light? (Just kidding.)
2.0 Mbps utilization may not be a bad thing, if that's an average use over a pretty long period of time. It's definitely nowhere near 100.0 Mbps top speed of the link if you're measuring over a short interval, though.
Is your laser equipment capable of running that link in full duplex mode? If yes, then set the two routers' interfaces to 100 Full.
Are your lasers properly aligned? With these it's usually either completely on or completely off. Intermittent throughput only happens due to weather (rain, fog, snow), environment (smoke or windy conditions), or UFOs (birds, aliens, people wearing jet packs, low flying aircraft).
Double-check the specifications on the 3660 routers. Can they handle Fast Ethernet at "wire speed" (that is, 148,880 64-byte frames per second)? I don't recall off-hand if they do. If not, and you don't need the routers for other reasons, you could substitute two less-expensive, L3-capable switches like Cat3550s instead. These will do "wire speed" switching and IP routing. (Or if you already have L3 switches available on both ends of the laser link, just patch the laser gear directly into them.)
I utilze an FSO solution as well. The equipment that I utilize has the capability of changing the link speed between the FSO heads or media converter. Example: I can change the speed to OC3-OC12 or 125Meg in either half/full duplex. I'd also suggest looking at the clocking and XTR/REC between the two heads. I also found that if I utilize auto negotiate on the router end and auto negotiate on the FSO heads or media converter. That it would only communicate at 100/half.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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