07-11-2018 07:33 AM
I performed a D-Port test on the ISL ports between our 6520s and on one of the ports I got the following result from portdporttest --show:
Roundtrip link latency: 1322 nano-seconds
Estimated cable distance: 101 meters
Buffers required: 1 (for 2112 byte frames at 16Gbps speed)
Egress power: Tx: 0.6 dBm, Rx: -2.7 dBm, Diff: 3.3 dBm (Loss is above tolerable limit)
Ingress power: Rx: -0.4 dBm, Tx: 0.0 dBm, Diff: 0.4 dBm (Loss is within tolerable limit)
What does "above tolerable limit" mean in this context? I don't get any errors on the port, so is some sort of action required or not?
Solved! Go to Solution.
07-11-2018 09:55 AM
Rx power = -2.7 looks good to me, but D-Port thinks that your link is a little dirty. Do you have any patch panels along the way or is it just straight SFP-cable-SFP connection? Anyway, you might need to clean it a little bit to improve the results. Sometimes even re-seating the cable into the SFP (and/or another connections) is already enough.