[f-nsp] Rate limiting on Foundry switches

[Josh]

Hi Robert,

> I'm working on an upgrade of our colocation Ethernet infrastructure, and  
> one thing I would like to be able to do is rate limit customers to a  
> particular speed with a granularity of 1 Mbit/s. I want it to work as  
> close as possible to a virtual communications link of the specified  
> speed. For example, an interface limited to 3 Mbit/s should act like a  
> pair of bonded T1s even though it is actually running over a 100BaseT  
> full duplex interface. Apparently this is hard to do, since the only  
> hardware I have seen that can do this well is Cisco IOS's rate-limit and  
> traffic-shape.

This is somewhat hard to do.  From my experience with various equipment,
you'll have much better luck doing rate limits <10M on a 10M port.
Ie - set the port to autonegotiate only 10M settings (so you can
get 10M full duplex without hardcoding both sides).

-josh