yum install vconfig

VLAN=yes
VLAN_NAME_TYPE=DEV_PLUS_VID

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes

/etc/sysconfig/network-scripts/ifcfg-eth0.0900

DEVICE=eth0.0900
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.1.1
NETMASK=255.255.255.0

/etc/modprobe.conf

#abbr
alias bond0 bonding
options bond0 miimon=100 mode=1 primary=eth0

/etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes

/etc/sysconfig/network-scripts/ifcfg-bond0.11

DEVICE=bond0.11
BOOTPROTO=none
ONBOOT=yes
VLAN=yes
BRIDGE=xenbr0

/etc/sysconfig/network-scripts/ifcfg-bond0.31

DEVICE=bond0.31
BOOTPROTO=none
ONBOOT=yes
VLAN=yes
BRIDGE=xenbr1

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
ONBOOT=yes
USERCTL=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none

/etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1
ONBOOT=yes
USERCTL=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none

/etc/sysconfig/network-scripts/ifcfg-eth2

DEVICE=eth2
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.0.10
NETMASK=255.255.255.0

With the DomUs bridged to VLAN interfaces, some optimizations need to be disabled or tcp and udp connections will fail. This is done by disabling transmit checksum offloading:

http://wiki.xen.org/wiki/Xen_Networking

#cat /etc/rc.local
#abbr#
ethtool -K eth0 tx off
ethtool -K eth1 tx off