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Hi,

It isn’t expected behaviour that data plane is broken just because neutron-ovs-agent is stopped. Agent should configure flows/iptables/ports and it should works even if agent is down.
Can You check exactly what is causing packet drops? Is it some missing open flow rule, something in iptables? Or maybe something else?

> On 21 Feb 2020, at 10:17, Chen CH Ji <jichenjc at cn.ibm.com> wrote:
> 
> We are running provider network with VLAN /FLAT, does the neutron-openvswitch-agent is mandatory to be running in order to make the VM deployed able to connect outside? 
>  
> e.g. I have a VM   instance-00000027, I login the VM and ping out side, in the mean time, use another session to 
> systemctl stop  neutron-openvswitch-agent.service then wait for a few minutes, the ping will stop, does this is an expected behavior?
> I know nova-compute is not running won't affect VM functionality, but does neutron openvswitch agent is needed or not? Thanks a lot
>  
> [root at kvm02 ~]# virsh list
>  Id   Name                State
> -----------------------------------
>  4    instance-00000027   running
>  
> [root at kvm02 ~]# virsh console 4
> Connected to domain instance-00000027
> Escape character is ^]
> [root at dede ~]# ping
> [root at dede ~]# ping 172.16.32.1
> PING 172.16.32.1 (172.16.32.1) 56(84) bytes of data.
> 64 bytes from 172.16.32.1: icmp_seq=1 ttl=64 time=19.8 ms
> 64 bytes from 172.16.32.1: icmp_seq=2 ttl=64 time=0.667 ms
> 64 bytes from 172.16.32.1: icmp_seq=3 ttl=64 time=0.774 ms
>  
> Ji Chen
> z Infrastructure as a Service architect
> Phone: 10-82451493
> E-mail: jichenjc at cn.ibm.com
> 

— 
Slawek Kaplonski
Senior software engineer
Red Hat