We have an issue with a 10 Gig connection between a Nexus 5548 and a 3750X 10Gig. There is also a HSRP group running over this link with aggressive timeouts which recently behaves somewhat unstable. We noticed a bunch of CRC errors on this link on the 3750X side (about 300 per hour) and assume that these are related to the HSRP troubles once or twice a day.
Originally the connection was made with a twinax cable. We already changed to MMF fiber with SR SFP+'s. The 10Gig Uplink Module in the 3750x has been replaced already. All to no avail. Now it's up to replace the 3750 (receives CRC) or the Nexus Chassis (sending device)
I was wondering if there is some experience on the list what is the most probably cause and solution here.
Thanks in advance,