[c-nsp] Output queues - access vs. trunk

Jerry Bacon jerryb at startouch.com
Fri Jul 19 22:57:37 EDT 2013

I have a 4948-10GE connected to a 2960G by a microwave radio link. We are testing with a Fluke One Touch AT.

When the the ports facing the radios are in access mode, everything is good, but when they are in trunk mode (which we need), we get 2 - 3% packet loss at small packet sizes (high packet rates). We've tracked it down to output queue drops, but I don't understand why it's different for access vs. trunk.

Any ideas? And would QOS tuning be likely to help?


Jerry Bacon
Senior Network Engineer
StarTouch, Inc.
360-543-5679 ext. 111
Microwave - Fiber Optics - Internet Services

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