We are currently seeing issues on a ESX Host using 10G Fibre dual connectivity to a pair of Nexus 7010's using vPC for the port channel to this ESX host which was working fine , up to this weekend. No changes had been made on the Nexus or ESX host.
We have changed the hardware path for the believed fault on a vmnic which when part of the virtual switch cause VM's on the Host to stop pinging, although we still see a CDP neighborship with the ESX from the Nexus, but changing fibre and Nexus ports has not worked.
As part of the testing , the vmware guy was removing this 'faulty' vmnic from the Virtual switch , which is part of an ether channel bundle his end. My first question is, how does the Nexus detect a link leaving the bundle for the ESX host , when the actual physical link is still up , and all they have done is software removed it from on the ESX, as the Nexus will still attempt to push traffic across both bundled links. I know there is the Cisco 1000V software , which can be used at an extra price, but is this the only option.
Any help will be gladly welcome.