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This link from the Redhat knowledge base talks all about it.
Here’s the list of steps and pointers I had to go through.
1. Make sure that the 8021q module is loaded
modprobe 8021q
2. This step is important as it defines the vlan that it listens on
Make a new interface file named “ifcfg-ethX.Y” where
X – the interface it will listen on.
Y – is the VLAN ID.
Add this to the config file
VLAN=yes
3. Create the neccessary IP configurations on the new interface file
4. Make sure that physical interface file looks like this. In my case it’s eth0
DEVICE=eth0 ONBOOT=yes
5. service network restart
6. Done!
