ESXi host network adapter link speed

[BiswarajPattan]

Hi All,

In my Prod environment the ESXi host has two network adapters vmnic0 and vmnic1

vmnic0 Link speed showing 100 Mbps and vmnic1 link speed is showing 1000Mbps. My question is why vmnic0 link speed is showing 100Mbps.  Requesting your immediate support. 

Regards

Biswaraj

[mannharry]

Hello ,

Run the command below on esxi host and check the speed of the adapters.

esxcfg-nics -l

Also to set the speed of specific nic use the below

esxcfg-nics
esxcfg-nics <options> [nic]
-s|--speed <speed> Set the speed of this NIC to one of 10/100/1000/10000.
Requires a NIC parameter.

[a_p_]

Some thoughts, assuming that the host's network adapter has no physical defect:

• check the network cable, or try another one
• check the physical switch port (speed/duplex auto)
• check the vmnic settings (speed/duplex auto - same as the physical switch port)
• see whether another device (e.g. a notebook) will negotiate to the expected speed on the physical switch port

André