[c-nsp] Needs some help with QOS

[Ivan Pepelnjak]

> http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note0918
> > 6a00800b2d29.shtml
> 
> Basically, the virtual interfaces "do not implement the 
> "back-pressure algorithm" necessary to signal that excess 
> packets should be queued by the Layer 3 (L3) queueing system."
> 
> Ok, so I'm going to have to implement a new solution based on 
> that document.
> 
> So just a final question, would the solution have worked if 
> it was on a regular interface? I just want to make sure I had 
> the right idea.

Yes, assuming that your outgoing interface is the bottleneck. For example,
if you have a point-to-point uplink, it's usually the bottleneck and the
queuing works as expected. But if you have a Fast Ethernet link into the SP
network which polices you @ 2 Mbps, the output queue will never form at your
output FE interface. Yet again, you'll have to configure shaping to
introduce an artificial bottleneck.

Ivan
 
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