auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
        post-down do_i_bring_bond0_down.sh
        post-up do_i_bring_bond0_up.sh

auto eth1
iface eth1 inet manual
        post-down do_i_bring_bond0_down.sh
        post-up do_i_bring_bond0_up.sh

auto eth2
iface eth2 inet manual
        post-down do_i_bring_bond0_down.sh
        post-up do_i_bring_bond0_up.sh

iface eth3 inet manual


auto bond0
iface bond0 inet manual
        slaves eth0 eth1 eth2
        bond_miimon 100
        bond_mode 802.3ad
        bond_xmit_hash_policy layer3+4
        bond_min_links 1

auto bond1
iface bond1 inet manual
        slaves bond0 eth3
        bond_miimon 100
        bond_mode active-backup
        bond_primary bond0
        bond_updelay 100
        bond_downdelay 100

auto vmbr0
iface vmbr0 inet static
        address  10.4.2.4
        netmask  255.255.255.192
        gateway  10.4.2.1
        bridge_ports bond1.20
        bridge_stp off
        bridge_fd 0

auto vmbr1
iface vmbr1 inet manual
        bridge_ports bond1
        bridge_stp off
        bridge_fd 0
        bridge_vlan_aware yes

Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: bond0 (primary_reselect always)
Currently Active Slave: bond0
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 100
Down Delay (ms): 100

Slave Interface: bond0
MII Status: up
Speed: Unknown
Duplex: Unknown
Link Failure Count: 0
Permanent HW addr: c8:1f:66:c2:dc:3b
Slave queue ID: 0

Slave Interface: eth3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:15:17:3a:a9:bf
Slave queue ID: 0

Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

802.3ad info
LACP rate: slow
Min links: 0
Aggregator selection policy (ad_select): stable
System priority: 65535
System MAC address: c8:1f:66:c2:dc:3b
Active Aggregator Info:
        Aggregator ID: 2
        Number of ports: 3
        Actor Key: 9
        Partner Key: 67
        Partner Mac Address: 80:2a:a8:df:42:b1

Slave Interface: eth0
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 1
Permanent HW addr: c8:1f:66:c2:dc:3b
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 1
Partner Churned Count: 1
details actor lacp pdu:
    system priority: 65535
    system mac address: c8:1f:66:c2:dc:3b
    port key: 0
    port priority: 255
    port number: 1
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: 80:2a:a8:df:42:b1
    oper key: 67
    port priority: 128
    port number: 8
    port state: 61

Slave Interface: eth1
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 1
Permanent HW addr: c8:1f:66:c2:dc:3c
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 0
Partner Churned Count: 0
details actor lacp pdu:
    system priority: 65535
    system mac address: c8:1f:66:c2:dc:3b
    port key: 0
    port priority: 255
    port number: 2
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: 80:2a:a8:df:42:b1
    oper key: 67
    port priority: 128
    port number: 7
    port state: 61

Slave Interface: eth2
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 1
Permanent HW addr: 00:15:17:3a:a9:be
Slave queue ID: 0
Aggregator ID: 2
Actor Churn State: none
Partner Churn State: none
Actor Churned Count: 1
Partner Churned Count: 1
details actor lacp pdu:
    system priority: 65535
    system mac address: c8:1f:66:c2:dc:3b
    port key: 0
    port priority: 255
    port number: 3
    port state: 61
details partner lacp pdu:
    system priority: 32768
    system mac address: 80:2a:a8:df:42:b1
    oper key: 67
    port priority: 128
    port number: 9
    port state: 61