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Knowledge Base

Link state up or down for a vmnic interface on ESXi (2006074)

Last Updated: 3/25/2024Categories: How toTotal Views: 115176Language:
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Learn how VMware Skyline Advisor and Skyline Health Diagnostics work together to provide proactive intelligence and self-service log analysis.

Use Skyline Advisor to avoid issues before they occur across VCF, vSphere, vSAN, NSX, vROps & Horizon. Skyline Findings are based on top KBs, VMSAs/CVEs and design best practices.

Use Skyline Health Diagnostics to root cause vSphere & vSAN logs when an issue occurs. Skyline Health Diagnostic Findings are based on top KBs and VMSA/CVEs. You can use the Skyline Health Diagnostics tool in online or offline mode.

If you require additional help from technical support, please use Skyline Advisor to initiate a Log Assist to reduce time to upload logs. TSEs can also initiate logs to reduce effort.

Purpose

This article provides commands to change the link state of the physical interface from the command line in ESXi. It also describes what each NIC link state means.

Resolution

To check NIC link status from the ESXi service console

Run this command:

esxcli network nic list

The output should come up similar to:

Name     PCI Device    Driver  Admin Status  Link Status   Speed  Duplex  MAC Address         MTU  Description
-------  ------------  ------  ------------  -----------  ------  ------  -----------------  ----  -----------
vmnic0   0000:01:00.0  ixgben  Up            Up             1000  Full    ec:f4:bb:da:b6:c8  1500  Intel(R) Ethernet Controller X540-AT2
vmnic1   0000:01:00.1  ixgben  Up            Up             1000  Full    ec:f4:bb:da:b6:ca  1500  Intel(R) Ethernet Controller X540-AT2

Note: The Admin Status is the only portion of the output that ESXi controls. The link status column specifies the status of the link between the physical network adapter and the physical switch. The link status can be either Up or Down.

To change the Admin status of the physical interface from the command line interface

Note: Only cards running auto-negotiation/10Mb/100Mb/1000Mb/10000Mb speeds are supported.

Log in to the ESXi host using Tech Support Mode with root account privilege.

Change the admin status of the uplink vmnic by running one of these commands:

esxcli network nic down -n vmnicX
esxcli network nic up -n vmnicX

Where X is the vmnic number (for example,vmnic0)

Important: If the Link Status shows the link as down, contact the host hardware vendor for troubleshooting. For more information, see Network adapter (vmnic) is down or fails with a failed criteria code (2014553).

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