Hello, I've a problem, all my ovirt hosts and vms are linked with a bonding mode 1（Active-Backup）2x10Gbps ovirt version：4.3 topology： ----------eno2 vm----------ovirtmgmt------bond0-----------eno1 ifcfg-bond0： # Generated by VDSM version 4.30.9.1 DEVICE=bond0 BONDING_OPTIOS='mode=1 miion=100' BRIDGE=ovirtmgmt MACADDR=a4:be:26:16:e9:b2 ONBOOT=yes MTU=1500 DEFROUTE=no NM_CONTROLLER=no IPV6INIT=no ifcfg-eno1: # Generated by VDSM version 4.30.9.1 DEVICE=eno1 MASTER=bond0 SLAVE=yes ONBOOT=yes MTU=1500 DEFROUTE=no NM_CONTROLLER=no IPV6INIT=no ifcfg-eno2: # Generated by VDSM version 4.30.9.1 DEVICE=eno2 MASTER=bond0 SLAVE=yes ONBOOT=yes MTU=1500 DEFROUTE=no NM_CONTROLLER=no IPV6INIT=no ifcfg-ovirtmgmt: # Generated by VDSM version 4.30.9.1 DEVICE=ovirtmgmt TYPE=Brodge DELAY=0 STP=off ONBOOT=yes IPADDR=x.x.x.x NEYMASK=255.255.255.0 GATEWAY=x.x.x.x BOOTPROTO=none MTU=1500 DEFROUTE=yes NM_CONTROLLER=no IPV6INIT=yes IPV6_AUTOCONF=yes cat /proc/net/bonding/bond0 Ethernet Chanel Bonding Driver:v3.7.1(April 27, 2011) Bonding Mode:fault-tolerance(active-ackup) Primary Slave:none Currently Active Slave:eno1 MII Status:up MII Polling Intercal (ms):100 Up Delay (ms) : 0 Down Delay (ms) : 0 Slave Interface :eno1 MII Status:up Speed : 10000 Mbps Link Failure Count : 0 Permanent HW addr :a4:be:26:16:e9:b2 Slave queue ID: 0 Slave Interface :eno2 MII Status:up Speed : 10000 Mbps Link Failure Count : 0 Permanent HW addr :a4:be:26:16:e9:b2 Slave queue ID: 0 ping vm from different subnet. Eveything is okay if I don't change bond link interface。When I unplug Currently Active Slave eno1,bond link change to eno2 as expected but vm become unreachable until external physical switch MAC Table ageing time expired.It seems that vm doesn't sent gratuitous ARP when bond link change. How can I fix if? vm os is Centos 7.5 ovirt version 4.2 also tested.