8.5. Naming Scheme for VLAN Interfaces

Traditionally, VLAN interface names in the format: interface-name.VLAN-ID are used. The VLAN-ID ranges from 0 to 4096, which is a maximum of four characters and the total interface name has a limit of 15 characters. The maximum interface name length is defined by the kernel headers and is a global limit, affecting all applications.
In Red Hat Enterprise Linux 7, four naming conventions for VLAN interface names are supported:
VLAN plus VLAN ID
The word vlan plus the VLAN ID. For example: vlan0005
VLAN plus VLAN ID without padding
The word vlan plus the VLAN ID without padding by means of additional leading zeros. For example: vlan5
Device name plus VLAN ID
The name of the parent interface plus the VLAN ID. For example: eth0.0005
Device name plus VLAN ID without padding
The name of the parent interface plus the VLAN ID without padding by means of additional leading zeros. For example: eth0.5