very High CRC and packet Fragmentation

[Kyojuro]

So our MS225-24 is setup as a breakout switch with it up streamed to the ISP router providing 1G for us. When we first connected these together, we used a SFP-10G-T SFP module on the switch to connect (No sfp on ISP Router side) and saw our applications fail and show very High CRC and packet Fragmentation. However, when we got rid of the SFP and just connected on the 1G port of the Meraki Switch, everything seems fine. The Meraki is set to auto negotiate and the ISP is telling us their device is also set to auto negotiate so I'm not sure why it was failing. Any ideas?

[cmr · Accepted solution]

I'd try either with a 1Gb SFP module or set it to auto 1Gb on the switch.

[MarcP]

I would also recommend a 1Gb SFP module as well. And would add to be aware, this is not a Meraki SFP you are using. Maybe this can cause these crc errors as well.