Affects of rate-limiting at the far end of links
Sam Stickland
sam_ml at spacething.org
Mon Dec 13 13:18:38 UTC 2004
Hi,
Just a quicky. We've got leased line out to a remote site that's pretty
much at capacity for remote to local site traffic, and from time to time
it appears to lock up for periods of 30 seconds or more.
Investigating it appears we outbound traffic shape, and ingress rate-limit
at the 'local' end of the line, but nothing is done at the 'remote' end.
The remote end is some 14ms away across a third party MPLS network.
Obviously we need to shape at the remote end, but the current behaviour
intrigues me. Rate-limiting, while bad compared to shaping, in my
experience doesn't lock out traffic for such long periods of time.
Could it be that buffers and flow-control over the 14ms third party leg
are causing the rate-limiting leaky bucket to continue to overflow long
after it's full?
Sam
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