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Since devices started to have switched Ethernet devices (namely, eth0.1
and eth0.2), using VLANs for the routing protocols (i.e., VLAN12 for
BMX6) became a challenge. The 802.1ad (QinQ) VLANs solution was cool,
but the MTU had to be changed to fit the extra 4 bytes, and it never
quite worked well. Therefore, it seems better to not use VLAN for the
routing protocol by default.
Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>