If you want to bridge two or more vlan at the same time.You can type these commands at the below.

Making bridge process
ifconfig eth0 up
vconfig add eth0 2
vconfig add eth0 4
brctl addbr br0
brctl addif br0 eth0.2
brctl addif br0 eth0.4
ifconfig eth0.2
ifconfig eth0.4
ifconfig br0
Take back confiiguration
ifconfig eth0.2 down
ifconfig eth0.4 down
ifconfig br0 down
brctl delif br0 eth0.2
brctl delif br0 eth0.4
vconfig rem eth0.2
vconfig rem eth0.4
brctl delbr br0
Debian based system script:
Created Thursday 13 May 2010
# This network script was written by Kerim BASOL
# Purpose of script bridge two vlan network
auto br0
iface br0 inet dhcp
# For the static configuration undelete comments and comment above the line
#iface br0 inet static
pre-up ifconfig eth0 up
pre-up vconfig add eth0 2
pre-up vconfig add eth0 4
pre-up brctl addbr br0
pre-up brctl addif br0 eth0.2
pre-up brctl addif br0 eth0.4
pre-up ifconfig eth0.2
pre-up ifconfig eth0.4
post-down ifconfig eth0.2 down
post-down ifconfig eth0.4 down
post-down ifconfig br0 down
post-down brctl delif br0 eth0.2
post-down brctl delif br0 eth0.4
post-down vconfig rem eth0.2
post-down vconfig rem eth0.4
post-down brctl delbr br0