This is a OpenNebula cluster. AFAICS all hosts are effected as soon as
they run with the new versions. Hosts have different hardware but
similar network configuration: 2 bonded NICs and a bridged interface to
be used by VMs.

 Network setup on VH host
auto lo
iface lo inet loopback
#eth0 is manually configured, and slave to the "bond0" bonded NIC
auto eth0
iface eth0 inet manual
bond-master bond1
#eth1 ditto, thus creating a 2-link bond.
auto eth1
iface eth1 inet manual
bond-master bond1
# bond1 is the bonded NIC and can be used like any other normal NIC.
auto bond1
iface bond1 inet manual
# bond1 uses standard IEEE 802.3ad LACP bonding protocol
bond-mode 802.3ad
bond-miimon 100
bond-lacp-rate 1
bond-xmit-hash-policy layer3+4
bond-slaves eth0 eth1
# Bridged interface to be used by VMs
auto ipblsrvrs
iface ipblsrvrs inet static
  bridge_ports bond1
  address 172.20.4.106
  gateway 172.20.4.1
  netmask 255.255.252.0
  bridge_stp on
  bridge_fd 1
  bridge_hello 2
  bridge_maxage 12


# Guest XML created by OpenNebula looks like this:

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
        <name>one-1110</name>
        <vcpu><![CDATA[2]]></vcpu>
        <cputune>
                <shares>205</shares>
        </cputune>
        <memory>4194304</memory>
        <os>
                <type arch='x86_64'>hvm</type>
        </os>
        <cpu mode='host-passthrough'>
        </cpu>
        <devices>
                <emulator><![CDATA[/usr/bin/kvm]]></emulator>
                <disk type='file' device='disk'>
                        <source 
file='/var/lib/one//datastores/101/1110/disk.0'/>
                        <target dev='vda'/>
                        <boot order='2'/>
                        <driver name='qemu' type='raw' cache='writeback'/>
                </disk>
                <disk type='file' device='cdrom'>
                        <source 
file='/var/lib/one//datastores/101/1110/disk.1'/>
                        <target dev='hda'/>
                        <readonly/>
                        <driver name='qemu' type='raw'/>
                </disk>
                <interface type='bridge'>
                        <source bridge='ipblsrvrs'/>
                        <mac address='02:00:3d:86:51:7b'/>
                        <target dev='one-1110-0'/>
                        <boot order='1'/>
                        <model type='virtio'/>
                </interface>
                <graphics type='vnc' listen='0.0.0.0' port='7010' 
passwd='secret'/>
        </devices>
        <features>
                <acpi/>
        </features>
        <devices><serial type='pty'><source path='/dev/pts/5'/><target 
port='0'/></serial><console type='pty' tty='/dev/pts/5'><source 
path='/dev/pts/5'/><target port='0'/></console></devices>
        <metadata>
                <system_datastore><![CDATA[/var/lib/one//datastores/101/1110]]> 
        </system_datastore>
        </metadata>
</domain>

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https://bugs.launchpad.net/bugs/1829245

Title:
  Networking issues after upgrade to 1:2.5+dfsg-5ubuntu10.37

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