Description

This article explains why the link may not be up despite having a cable directly connected between heth-0-4 or heth-0-5 and a switch, and provides a workaround to resolve the issue.

 

Symptoms

  • Gig port is directly connected to a switch.

  • I tried to connect with 1 Gig SFP and 10 Gig SFP, but could not see the link up.

 

Solution

The Intel NIC on heth-0-4 and heth-0-5 has a physical NIC limitation of not supporting auto-negotiation. This is a product limitation with Intel.

 

The workaround is to disable auto-negotiation on the interface on NFX150, and on the interface of the mating switch.

On NFX150 

root@t01-39# show vmhost                                          
interfaces {
    heth-0-4 {
        ether-options {
            no-auto-negotiation;
        }
    }
}

Configure the equivalent on a peer switch device to bring up the link.