Sysconfig ifcfg scripts and VLAN sub-interfaces

If you are using the ifcfg scripts in /etc/sysconfig/network-scripts to bring up VLAN sub-interfaces on a NIC and you are getting messages such as:

Bringing up interface eth0.200: Device eth0.200 does not seem to be present, delaying initialization.

instead of

Bringing up interface eth0.200: Added VLAN with VID == 200 to IF -:eth0:-

as you would expect, then make sure that you have the vconfig RPM installed.

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