Dear Cisco community. I wanted to get your take on some interface issues we've been having between or Nexus 9K and Catalyst C6807. Seeing CRC errors on the 6807 (wancore) - and output errors and discards on the connected links on the 2 Nexus switches (1 and 2) - it's a port channeled link - VPC across the 2 9Ks. I will include screen shots and a diagram here as well. These errors \ discards have yet to take notice in production but they are obviously unhealthy even though they are not rapidly increasing. Besides looking at cabling, I was hoping to get some insight on how best to troubleshoot this. We have jumbo frames enabled on some of the nexus ports for esxi servers and such - so these frames are present at the EtherChannel trunk links connecting our wancore. We of course do not want or need jumbo frames in our wancore \ wan links, so my question is, would these jumbo frames account for the discards and errors on seen on the nexus interfaces, and the crc\ input errors on the receiving wancore interfaces? I read that ideally, you want to separate your jumbo framed traffic, but w our hosted environment, and having everything L2 trunked, this is the situation we have. Appreciate any ideas or insight in advance! Thanks...Dennis
