Automating VLAN creation

Debian has the extremely nice /etc/network/interfaces configuration system. The following entry is an elegant way to dynamically create VLAN interfaces as they are needed. This entry is used at UWA to establish connectivity with the University Computer Club:

auto eth0.13
iface eth0.13 inet6 static
        address 2001:388:7094:1::1
        netmask 64
        pre-up vconfig add eth0 13
        up ip route add 2001:388:7094:4080::/58 via 2001:388:7094:1::2