Overview:
Description: Ubuntu 10.04.2 LTS
Release: 10.04
Kernel tested: 2.6.38-7-server kernel

Public bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/736226

Bonding + bridge does not work when bonding mode is set to active-backup and arp monitoring is enabled. (bond_arp_ip_target and bond_arp_interval)
There is a reported patch for this problem on: http://kerneltrap.org/mailarchive/linux-netdev/2010/4/28/6275890
Please read redhat's related bug: https://bugzilla.redhat.com/show_bug.cgi?id=584872
PS: This issue is also seen on the latest kernels 2.6.35-25-server.

Reproducible: 100%
How to reproduce the problem

1. Install ifenslave
$ sudo apt-get install ethtool

2. Install bridge utils
$ sudo apt-get install bridge-utils

3. Use the following /etc/network/interfaces sample.
auto lo
iface lo inet loopback

auto bond0
iface bond0 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bond-slaves none
    bond-mode active-backup
    bond_arp_ip_target 10.153.107.1
    bond_arp_interval 100

auto eth0
allow-bond0 eth0
iface eth0 inet manual
    bond-master bond0

auto eth1
allow-bond0 eth1
iface eth1 inet manual
    bond-master bond0

auto bond0.100
iface bond0.100 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    vlan-raw-device bond0

auto bond0.200
iface bond0.200 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    vlan-raw-device bond0

auto br0
iface br0 inet static
    address 10.153.107.110
    netmask 255.255.255.0
    gateway 10.153.107.1
    bridge_ports bond0
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

auto br0-100
iface br0-100 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bridge_ports bond0.100
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

auto br0-200
iface br0-200 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bridge_ports bond0.200
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

Reboot the server. You won't be able to ping the br0 interface anymore.

Workaround:

Disable bond_arp_ip_target and bond_arp_interval and use MII monitoring. As follow below:

auto lo
iface lo inet loopback

auto bond0
iface bond0 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bond-slaves none
    bond-mode active-backup
    bond-downdelay 250
    bond-updelay 120

auto eth0
allow-bond0 eth0
iface eth0 inet manual
    bond-master bond0

auto eth1
allow-bond0 eth1
iface eth1 inet manual
    bond-master bond0

auto bond0.100
iface bond0.100 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    vlan-raw-device bond0

auto bond0.200
iface bond0.200 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    vlan-raw-device bond0

auto br0
iface br0 inet static
    address 10.153.107.110
    netmask 255.255.255.0
    gateway 10.153.107.1
    bridge_ports bond0
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

auto br0-100
iface br0-100 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bridge_ports bond0.100
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

auto br0-200
iface br0-200 inet manual
    post-up ifconfig $IFACE up
    pre-down ifconfig $IFACE down
    bridge_ports bond0.200
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

Leonardo Borda