[Qemu-discuss] KVM Qemu libvirtd virtual bridged with bond advanced-alb

[Mimiko]

Hello.

Recently I started to use qemu-kvm for virtualisation.

I've setup a bridged network and use it in virtual machine:

<network>
  <name>default</name>
  <forward mode='bridge'/>
  <bridge name='virbr0' />
</network>

<domain type='kvm'>
  <name>test</name>
  <os>
    <type arch='x86_64' machine='pc-1.1'>hvm</type>
    <boot dev='network'/>
    <boot dev='hd'/>
  </os>
  <devices>
    <interface type='bridge'>
      <mac address='52:54:00:3f:69:98'/>
      <source bridge='br0'/>
      <model type='e1000'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' 
function='0x0'/>
    </interface>
  </devices>
</domain>


When the bond used in the bridge setup is set to 802.3ad, network in 
guests work ok. When I use bridge mode advanced-alb, network in guests 
works for some time then starts to timeout connections.

What could be the conflict of qemu with advanced-alb mode?

This is my specifications:
Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.73-2+deb7u3 x86_64 GNU/Linux

auto eth0
iface eth0 inet manual

auto eth1
iface eth1 inet manual

auto bond0
iface bond0 inet manual
        # load balancing and fault tolerance
        bond-slaves eth0 eth1
        bond-mode 802.3ad
        #bond-mode balance-alb
        bond-miimon 100
        bond-downdelay 200
        bond-updelay 200
        up ip link set bond0 mtu 9000

auto br0
iface br0 inet static
        bridge_ports bond0
        bridge_stp off
        bridge_fd 0
        #bridge_maxage 0
        bridge_ageing 0
        bridge_maxwait 0
        up ip link set br0 mtu 9000

I've skipped adress/mask specification.

I've tried to enable stp, change mtu, change delay. Nothing helps. Same 
configuration in interfaces, I change only `bond-mode`. With `bond-mode 
802.3ad` everything works ok. With `bond-mode advanced-alb` guest have 
network problems. The host system does not have any network problem in 
any mode.

Thank you