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.
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.