Link capacity upgrade threshold
jbates at brightok.net
Wed Sep 2 14:16:10 UTC 2009
Mikael Abrahamsson wrote:
> If you're dropping packets, you're already over the cliff. Our job as
> ISP is to forward the packets our customers send to us, how is that
> compatible with upgrading links when they're so full that you're not
> only buffering but you're actually DROPPING packets?
Many ISPs don't even watch the dropping rate. Packets can easily start
dropping long before you reach an 80% average mark or may not drop until
90% utilization. Dropped packets are a safeguard measurement to detect
data collision that fills the buffers.
One could argue that setting QOS with larger buffers and monitoring the
buffer usage is better than waiting for the drop.
More information about the NANOG