Bug 1784081

verified on version below:

[root@dell-per730-57 basic]# rpm -qa|grep ovn
ovn2.11-host-2.11.1-24.el7fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-common-1.0-6.noarch
ovn2.11-central-2.11.1-24.el7fdp.x86_64
kernel-kernel-networking-openvswitch-ovn-basic-1.0-16.noarch
kernel-kernel-networking-openvswitch-ovn-qos-1.0-1.noarch
ovn2.11-2.11.1-24.el7fdp.x86_64


#add load balance on logical router
                uuid=`ovn-nbctl create load_balancer vips:30.0.0.1="172.16.103.11,172.16.103.12"`
                ovn-nbctl set load_balancer $uuid vips:'"30.0.0.1:8000"'='"172.16.103.11:80,172.16.103.12:80"'
                #create load balance check
                uuid3=`ovn-nbctl --id=@hc create Load_Balancer_Health_Check vip="30.0.0.1\:8000" -- add Load_Balancer $uuid health_check @hc`
                ovn-nbctl set Load_Balancer_Health_Check $uuid3 options:interval=5 options:timeout=20 options:success_count=3 options:failure_count=3
                ovn-nbctl set logical_router r1 load_balancer=$uuid
                ovn-nbctl --wait=sb set load_balancer $uuid ip_port_mappings:172.16.103.12=hv0_vm01_vnet1:172.16.103.1
                ovn-sbctl list service_monitor|grep "status.*\[\]" || ((result += 1))
                rlRun "ovn-sbctl list service_monitor"

[root@dell-per730-57 basic]# ovn-sbctl list service_monitor
_uuid               : af85a476-b867-4a64-b8a9-99fba2c2a8d0
external_ids        : {}
ip                  : "172.16.103.12"
logical_port        : "hv0_vm01_vnet1"
options             : {failure_count="3", interval="5", success_count="3", timeout="20"}
port                : 80
protocol            : tcp
src_ip              : "172.16.103.1"
src_mac             : "de:94:9a:e5:bf:c4"
status              : []



                for ((i=0; i<10; i++))
                do
                    vmsh run_cmd $(vm_name $hv 0) 'curl 30.0.0.1:8000 >> log.txt'
                done
                vmsh run_cmd $(vm_name $hv 0) 'cat log.txt | grep vm1' || ((result += 1))
                vmsh run_cmd $(vm_name $hv 0) 'cat log.txt | grep vm2' || ((result += 1))
                echo "result=$result"
                vmsh run_cmd $(vm_name $hv 0) 'cat log.txt'
                echo "result=$result"

                vmsh run_cmd $(vm_name 1 1) 'ip link set down dev eth1'
                sleep 30
                rlRun "ovn-sbctl list service_monitor"
[root@dell-per730-57 basic]# ovn-sbctl list service_monitor
_uuid               : af85a476-b867-4a64-b8a9-99fba2c2a8d0
external_ids        : {}
ip                  : "172.16.103.12"
logical_port        : "hv0_vm01_vnet1"
options             : {failure_count="3", interval="5", success_count="3", timeout="20"}
port                : 80
protocol            : tcp
src_ip              : "172.16.103.1"
src_mac             : "de:94:9a:e5:bf:c4"
status              : offline

                rlRun "ovn-sbctl list service_monitor|grep \"status.*offline\""
                ovn-sbctl list service_monitor|grep "status.*offline" || ((result += 1))
                vmsh run_cmd $(vm_name 1 1) 'ip link set up dev eth1'
                sleep 30
                rlRun "ovn-sbctl list service_monitor"
                rlRun "ovn-sbctl list service_monitor|grep \"status.*online\""
                ovn-sbctl list service_monitor|grep "status.*online" 
[root@dell-per730-57 basic]# ovn-sbctl list service_monitor
_uuid               : af85a476-b867-4a64-b8a9-99fba2c2a8d0
external_ids        : {}
ip                  : "172.16.103.12"
logical_port        : "hv0_vm01_vnet1"
options             : {failure_count="3", interval="5", success_count="3", timeout="20"}
port                : 80
protocol            : tcp
src_ip              : "172.16.103.1"
src_mac             : "de:94:9a:e5:bf:c4"
status              : online

#change the src_mac
[root@dell-per730-57 basic]# ovn-nbctl set NB_Global . options:svc_monitor_mac="fe:a0:65:a2:01:03"
[root@dell-per730-57 basic]# ovn-sbctl list service_monitor
_uuid               : 89eec067-6f39-4c29-8d7b-3633de6d0bda
external_ids        : {}
ip                  : "172.16.103.11"
logical_port        : "hv0_vm00_vnet1"
options             : {failure_count="3", interval="5", success_count="3", timeout="20"}
port                : 80
protocol            : tcp
src_ip              : "172.16.103.1"
src_mac             : "fe:a0:65:a2:01:03"
status              : online

[root@localhost ~]# tcpdump -i eth1 -e -nn -v 
[60764.285786] device eth1 entered promiscuous mode
tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
20:58:44.509627 fe:a0:65:a2:01:03 > 00:de:ad:00:00:01, ethertype IPv4 (0x0800), length 54: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto TCP (6), length 40)
    172.16.103.1.44719 > 172.16.103.11.80: Flags [S], cksum 0x37bf (correct), seq 1969041168, win 65160, length 0
20:58:44.509661 00:de:ad:00:00:01 > fe:a0:65:a2:01:03, ethertype IPv4 (0x0800), length 58: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP (6), length 44)
    172.16.103.11.80 > 172.16.103.1.44719: Flags [S.], cksum 0x264c (incorrect -> 0x4ef7), seq 1130240533, ack 1969041169, win 29200, options [mss 1460], length 0
20:58:44.510345 fe:a0:65:a2:01:03 > 00:de:ad:00:00:01, ethertype IPv4 (0x0800), length 54: (tos 0x0, ttl 63, id 0, offset 0, flags [DF], proto TCP (6), length 40)
    172.16.103.1.44719 > 172.16.103.11.80: Flags [R.], cksum 0xda36 (correct), seq 2, ack 1, win 65160, length 0

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:0190