LinuxQuestions.org - Routing on 2 bonds/xen bridges over two different networks

I'm trying to setup the following on a red hat 5 HP DL380 server:
(2 bonds mapped to 2 xen bridges on 2 different networks)

interfaces bond xen bridge network
eth0&eth1 -> bond0 -> xenbr0 -> 172.16.6.0/24
eth2&eth3 -> bond1 -> xenbr1 -> 172.16.5.0/24

For IP bonding I want the OS be responsible for configuring the Network Bridges(not xend).
So I've commented out any line starting with '(network-script' in the /etc/xen/xend-config.sxp file.

My configuration is as follows:
1) For Bond0:

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
#BONDING_OPTS="mode=1 miimon=100"
BRIDGE=xenbr0

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-xenbr0
DEVICE=xenbr0
IPADDR=172.16.5.172
NETMASK=255.255.255.0
NETWORK=172.16.5.0
#GATEWAY=172.16.5.1
BROADCAST=172.16.5.255
ONBOOT=yes
TYPE=bridge
USERCTL=no
BOOTPROTO=none

2) For Bond1
[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
USERCTL=no
ONBOOT=yes
MASTER=bond1
SLAVE=yes
BOOTPROTO=none

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth3
DEVICE=eth3
USERCTL=no
ONBOOT=yes
MASTER=bond1
SLAVE=yes
BOOTPROTO=none

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-bond1
DEVICE=bond1
BOOTPROTO=none
ONBOOT=yes
#BONDING_OPTS="mode=1 miimon=100"
BRIDGE=xenbr1

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-xenbr1
DEVICE=xenbr1
IPADDR=172.16.6.172
NETMASK=255.255.255.0
NETWORK=172.16.6.0
#GATEWAY=172.16.6.1
BROADCAST=172.16.6.255
ONBOOT=yes
TYPE=bridge
USERCTL=no
BOOTPROTO=none

The modprobe.conf is setup as follows:
[root@localhost ~]# cat /etc/modprobe.conf
alias eth0 bnx2
alias eth1 bnx2
alias eth2 e1000e
alias eth3 e1000e
alias scsi_hostadapter cciss
alias scsi_hostadapter1 ata_piix
alias bond0 bonding
alias bond1 bonding
options bond0 mode=1 miimon=100
options bond1 mode=1 miimon=100

I have defined two static routes for each bond, to communicate via 2 different gateways:
[root@localhost ~]# cat /etc/sysconfig/network-scripts/route-xenbr0
172.16.5.0/24 via 172.16.5.1

[root@localhost ~]# cat /etc/sysconfig/network-scripts/route-xenbr1
172.16.6.0/24 via 172.16.6.1

The network file is as follows:
[root@localhost ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost.localdomain
GATEWAY=172.16.5.1

The problem is that in the routing table, it seems that both networks are routed via the default gateway:
[root@localhost ~]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.6.0 * 255.255.255.0 U 0 0 0 xenbr1
172.16.5.0 * 255.255.255.0 U 0 0 0 xenbr0
192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0
169.254.0.0 * 255.255.0.0 U 0 0 0 xenbr1
default 172.16.5.1 0.0.0.0 UG 0 0 0 xenbr0

The routes I wish to see are:
Destination Gateway Genmask Flags Metric Ref Use Iface
172.16.6.0 172.16.6.1 255.255.255.0 U 0 0 0 xenbr1
172.16.5.0 * 255.255.255.0 U 0 0 0 xenbr0

So the static routes that are configured, do not seem to taking effect.

Has anybody encountered an issue like this before, or knows where to point me in the right direction?