I'd like some advice on an output drop issue I'm having with a point-to-point T1. The output drops increment up by 200 - 700 every 15 minute interval during business hours. After hours no drops are recorded. Traffic is at approx 50% up and 20% down so the drops shouldn't be from over utilization. (see attached) The traffic on the T1 is 90% HTTP data.
I've read other posts recommending a larger hold-queue. Before I made any changes, I wanted to see what the community thought and if there were any other recommendations.
Is there a hold-queue that is an âindustry standardâ?
Should the A end and Z end serial interfaces have symmetrical hold-queue settings?
"Traffic is at approx 50% up and 20% down so the drops shouldn't be from over utilization."
Unfortunately, such stats usually provide an average load over some time period (often into minutes) while drops often happen down at the millisecond level. As your drops show, less than 100% average utilization doesn't preclude them.
It appears you might be running WFQ on this interface, which generally manages congestion well. Assuming your transient congestion is from TCP bandwidth probing (likely with your noting 90% of traffic is HTTP), it's possible you could reduce your drop rate (which, as a percentage [.24%], appears acceptable) by some amount but you may possibly introduce other adverse effects.
I would recommend you leave things as they are for now.
"Is there a hold-queue that is an âindustry standardâ? "
One might argue for a queue that can support BDP (bandwidth delay product).
"Should the A end and Z end serial interfaces have symmetrical hold-queue settings? "
Depends on different factors, one being whether you also have symmetrical performance.
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