01-29-2019 08:07 AM - edited 01-29-2019 08:26 AM
I've a lot of CRC errors on my ISL port between my two D300. We have changed sfp and cable but I still have error ! They appears after a major power issue in all city.
I want to move sfp and cable to a new port and so change my ISL port, is it possible to perform that ?
In case of, we have also done a fastboot on the switch.
Don't have any other idea about this issue...
Tks in advance.
01-31-2019 07:39 AM - edited 01-31-2019 07:39 AM
are you having only CRC errors or do you see another type of errors on the links?
01-31-2019 10:42 AM - edited 01-31-2019 10:44 AM
First, the CRC errors need to be confirmed they are happening between the ISL ports and
not originating from a device attached to either switch.
If the CRC error on the ISL port has incremented for counter "CRC" and "CRC g_eof"
then the CRC happened between the ISL ports.
If the CRC error on the ISL has incremented for counter "CRC" but "CRC g_eof" count is 0,
then the CRC happened before the frame reached the ISL port.
Use command porterrshow to observe CRC and CRC g_eof.
So, determine if the CRCs are occurring between ISLS or before the frame is forwareded
to the ISLs.
1) Clear the fc counters (cmd: statsclear) on each switch
2) Clear the ASIC counters (cmd: slotstatsclear) on each switch
3) Monitor for CRCs and CRC g_eof counters for ISL ports using command: porterrshow
If CRC increments but not CRC g_eof, the frame damage happened before the ISL port.
Check the other ports on the switch that could be sending frames across the ISL.
If CRC and CRC g_eof increment, I would check the output of "sloterrshow" to see
if there is any internal ASIC issue causing CRCs.
4) Check the SFP tx and rx power levels too: sfpshow x/y
<My typical threshold for 4 and 8Gb is power level is power should be above 200uW>