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

[Stéphane Graber]

Ubuntu being event based, we don't use the allow magic to bring up the
interfaces.

The way it works in Ubuntu is that the first interface to come up will bring the bond along with it, so you'd usually do:
ifdown eth1
ifdown eth0
ifdown bond0
ifup eth0
ifup eth1
ifup bond0

The order is pretty important as bringing up the bond before any slave
will make it hang and wait for a slave to join.

I'll update the documentation to remove the allow- section.

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

Status in “ifenslave-2.6” package in Ubuntu:
  New

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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