ESX 6.7, Mellanox MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s], Cisco 3750E, X2-10GB-SR
The Mellanox (HP brand card) is connected via fiber to the X2-10GB-SR transceiver. After th ESX host reboots, the nic is fully operational and traffic is going both ways and the Cisco is blinking. But after a few minutes, the connection seems to drop. ESX is saying the link is up, but the Cisco is saying that the 10GB line protocol is down "(not connect)" and that the Optical Receive Power is -40. No more traffic flows. Disconnecting the transceiver or the fiber cable and connecting doesn't bring the link back, only a reboot of the ESX host. Then it works for a few minutes before shutting down again.
I can't see any reference in the ESX or Cisco logs. ESX still thinks the link is connected, probably because the Ciso Optical Transmit Power is -4.4 and the Mellanox is receiving light, but no light from the Mellanox to the Cisco switch. Any thoughts on why ESX or the NIC is shutting down the transmit side?
Thanks!
The Mellanox (HP brand card) is connected via fiber to the X2-10GB-SR transceiver. After th ESX host reboots, the nic is fully operational and traffic is going both ways and the Cisco is blinking. But after a few minutes, the connection seems to drop. ESX is saying the link is up, but the Cisco is saying that the 10GB line protocol is down "(not connect)" and that the Optical Receive Power is -40. No more traffic flows. Disconnecting the transceiver or the fiber cable and connecting doesn't bring the link back, only a reboot of the ESX host. Then it works for a few minutes before shutting down again.
I can't see any reference in the ESX or Cisco logs. ESX still thinks the link is connected, probably because the Ciso Optical Transmit Power is -4.4 and the Mellanox is receiving light, but no light from the Mellanox to the Cisco switch. Any thoughts on why ESX or the NIC is shutting down the transmit side?
Thanks!