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Sandeep Singh
Rising star
Rising star




This document lists various ESX and ESXi commands to troubleshoot n1k issues on UCS. In ESX with a Console OS, these commands are in the /usr/sbin directory. This procedure assumes you have the KVM IP addresses setup and assigned already. To get to a misconfigured UCS blade for recovery, please click on the KVM item under the server view.


Commands to Add/Delete and Manage Config

To list information on current configuration:

esxcfg-vswif -l        To list information on the current vswifs

esxcfg-vswitch -l      To list information on the current vswitches and DVS


To manage the existence of a vSwitch:

esxcfg-vswitch -a vSwitch0        To add a vSwitch named vSwitch0 to the server

esxcfg-vswitch -d vSwitch0        To delete a vSwitch named vSwitch0 from server


To manage the port-groups on a vSwitch:

esxcfg-vswitch -A  "Service Console" vSwitch0      To add a port-group named Service Console to vSwitch0

esxcfg-vswitch -D  "Service Console" vSwitch0      To remove a port-group named Service Console from vSwitch0


To assign VLAN membership to a port-group on  a vSwitch:

esxcfg-vswitch -p "Service Console" -v 102 vSwitch0      To set a port-group named Service Console to user VLAN 102 on vSwitch0


To view available NICs that ESX can see:

esxcfg-nics -l      To see list of vmnics


To manage uplinks from the DVS or N1k:

First run the list commands (mentioned above) to get the port numbers for the existing uplinks (vmnic0, vmnic1,etc.) In this document lets call this as port#.

esxcfg-vswitch -Q vmnic0 -V [port#] myN1kDVS      To remove the vmnic0 uplink from the DVS named myN1kDVS

esxcfg-vswitch -P vmnic0 -V [port#] myN1kDVS      To add the vmnic0 uplink to the DVS named myN1kDVS


To add the vmnic's back into a DVS it is good to do this via vCenter and not the command line.


To manage uplinks to a vSwitch:

esxcfg-vswitch -L vmnic0 vSwitch0      To add vmnic0 as an uplink to vSwitch0

esxcfg-vswitch -U vmnic0 vSwitch0      To remove vmnic0 as an uplink to vSwitch0. 


To remove a vmnic from a vSwitch, it is good to do this via vCenter and not the command line while migrating from vSwitch to N1k DVS.


To delete a vswif from a ESX server port group:

esxcfg-vswif -d vswif0 -p "Service Console" vSwitch0                To delete a vswif from the port-group on vSwitch0

esxcfg-vswif -d vswif0 -p "Service Console" -P xxx -V myN1kDVS      To delete a vswif from the port-group on the Nexus1000V. 


This is a common task if an error situation arises, and you lose connectivity to the ESX server when migrating to Nexus 1000V.  You will have to add the port-group to the vSwitch0, then add the vswif on it.


To add a vswif to the ESX server:

esxcfg-vswif -a vswif0 -p "Service Console" -i -n          To add a vswif0 with IP to port-group Service Console

esxcfg-vswif -a vswif0 -p "Service Console" -i -n -P [port#] -V myN1kDVS      To add a vswif0 with IP to port-group Service Console to the port = port# on the DVS myN1kDVS. 


The port# is usually just the last unused entry to the list of available port numbers when listing the DVS configuration with esxcfg-vswitch -l.


To manage a default gateway for the ESX server:

On the vCenter GUI, you can change this directly, but on the CLI, you must edit the /etc/sysconfig/network file and update the vswifs default gateway.  The file will look similar to:





After saving the file, the ESX server must be rebooted to accomplish the change


Commands to Troubleshoot

To Ping test out a VMkernel interface:

esxcfg-route -l               To get the routes on the VMKernel network

vmkping X.X.X.X           To ping an IP on the VMKernel network


To test for the VEM installation on an ESX host:

vmkload_mod -l  | grep vem      To ensure the appropriate VEM is loaded (should return the modules)


Related Information

Install and Configure Nexus 1000v on VMware

Nexus 1000v Log Collection

Getting Started

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