Comment 22 for bug 889423

Added "post-up ip link set dev bond0 up" and that appears to work:

$ ifconfig bond0
bond0 Link encap:Ethernet HWaddr 00:1b:21:d3:f6:0b
          inet6 addr: fe80::21b:21ff:fed3:f60b/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
          RX packets:15 errors:0 dropped:9 overruns:0 frame:0
          TX packets:78 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1486 (1.4 KB) TX bytes:9430 (9.4 KB)

# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer2 (0)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 200
Down Delay (ms): 0

802.3ad info
LACP rate: slow
Aggregator selection policy (ad_select): stable
Active Aggregator Info:
        Aggregator ID: 2
        Number of ports: 2
        Actor Key: 17
        Partner Key: 24
        Partner Mac Address: 00:04:96:18:54:d5

Slave Interface: eth3
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:1b:21:d3:f6:0b
Aggregator ID: 2
Slave queue ID: 0

Slave Interface: eth2
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 00:1b:21:d3:f6:0a
Aggregator ID: 2
Slave queue ID: 0