CRC errors in VPC Peer links between two N9K

[hi.sadiki]

Hello guys,

traffic between Two of our servers (different subnets) encounter packet lost sometimes.

while tracking the path between the two serveurs, i saw that they cross  TWO N9K  switches before they go UP to a FW doing Routing.

The two N9K are connected by  VPC (3 VPC Peer links)

TWO  of the VPC Peer links had high CRC errors.

is that can likely cause the packet lost between my two servers. Howcome ?

Thanks for your help.

Hicham

[Twitch]

Hello, 

In order to troubleshoot this issue, I think some more information would be necessary:

Please provide the configuration of the vPC/associated interfaces, as well as describe what brand the servers are, what type of NIC cards they are running and if they are bare-metal or virtual chassis. I normally see high packet loss/CRC on server port-channels due to bad Layer 1, or out-of-date NIC drivers, or incorrect forwarding by the virtual hypervisor, due to misconfiguration. vPC and VMWare/Hyper-V can be tricky with Nexus vPC. Thanks

[paul driver]

Hello

Have you checked/changed the cabling ,SFPs modules etc..regards teh crc errors?
Can you post the output:
sh vpc
sh vpc peer-keepalive
sh vpc consistency-parameters global