Hypervisor active-backup bonding failover results in loss of guest network connectivity

Solution Verified - Updated -

Issue

  • Hypervisor active-backup bonding failover results in loss of guest network connectivity
  • When the cable is disconnected between the switch and the active bonding device of dom0, domU stops responding to ICMP packet although dom0 continues to respond. Why?
  • Temporary inbound guest communication failure upon bond link failover at the host
  • KVM bond failover results in VM unavailable
  • When a network bond (mode 1) does a failover, as long as no traffic comes from the VM after the failover, the VM is not reachable from outside. To me it seems like a gratuitous ARP is missing after failover.
  • Virtual guests disappear or unreachable from LAN after link down event on virtual machine host.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5
  • KVM or Xen virtualization
  • Physical interfaces bonded with mode=1 or active-backup on hypervisor
  • Bonding interface in bridge, providing network connectivity to guests

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