[Bug 1073820] Re: ifdown/ifup of bond interface does not add slaves

[Ralf Spenneberg]

Thanks a lot. So you are saying there is no way to do an
ifdown bond0
ifup bon0 
and the bond is recreated on Ubuntu?

Maybe this needs to be stated in the documentation as this is the
expected behavior.

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Title:
  ifdown/ifup of bond interface does not add slaves

Status in “ifenslave-2.6” package in Ubuntu:
  Fix Committed

Bug description:
  Release: Ubuntu 12.04
  ifenslave-2.6                    1.1.0-19ubuntu5 

  At boot time bonding interfaces are activated fine. But if I manually
  ifdown the bonding interface and subsequently ifup it againt the
  physical network cards are not enslaved.

  I use the following configuration:
  auto extern
  iface extern inet static
          address 192.168.0.5
          netmask 255.255.255.0
          bond-mode 1
          bond-miimon 100
          bond-slaves none

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

  auto eth2
  allow-extern eth2
  iface eth2 inet manual
          bond-master extern

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

  Bonding Mode: fault-tolerance (active-backup)
  Primary Slave: None
  Currently Active Slave: eth0
  MII Status: up
  MII Polling Interval (ms): 100
  Up Delay (ms): 0
  Down Delay (ms): 0

  Slave Interface: eth0
  MII Status: up
  Speed: 1000 Mbps
  Duplex: full
  Link Failure Count: 0
  Permanent HW addr: 00:26:2d:05:37:2f
  Slave queue ID: 0

  Slave Interface: eth2
  MII Status: up
  Speed: 1000 Mbps
  Duplex: full
  Link Failure Count: 0
  Permanent HW addr: 00:15:17:f6:ec:d9
  Slave queue ID: 0

  When issuing ifdown and subsequently ifup the following is displayed:
  # ifup extern
  Waiting for a slave to join extern (will timeout after 60s)
  No slave joined extern, continuing anyway
  Failed to bring up extern.

  By the way, replacing extern with a typical bonding-device name as
  bond1 does not change the behaviour.

  Adding 
  bond-primary eth0 eth2 
  to all stanzas does not change the behavior.

  Changing bond-slaves to 
  bond-slaves eth0 eth2
  does not change the behaviour. README.Debian states that if both bond-master and bond-slaves is used bond-slaves is ignored.

  The only way to correct the behaviour is to manually ifup eth0 and ifup eth2. I thought this is the responsibility of the 
  allow-extern eth0/eth2
  lines.

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