On 2/24/23 06:29, 张祖建 wrote:
> Tried on branch-3.1, branch-2.17, and branch-2.16, and all of them work well.
> 
> Thanks very much!

Thanks for testing and confirmation!

Best regards, Ilya Maximets.

> 
> Ilya Maximets <i.maxim...@ovn.org <mailto:i.maxim...@ovn.org>> 于2023年2月24日周五 
> 00:41写道:
> 
>     On 2/22/23 02:31, 张祖建 wrote:
>     > I'm using OVS v3.1 + OVN v22.12. Both Geneve and VXLAN have similar 
> behavior.
> 
>     I think, I found the root cause of this behavior.
>     Posted a patch to fix it here:
>       
> https://patchwork.ozlabs.org/project/openvswitch/patch/20230223163927.915879-1-i.maxim...@ovn.org/
>  
> <https://patchwork.ozlabs.org/project/openvswitch/patch/20230223163927.915879-1-i.maxim...@ovn.org/>
> 
>     Would be great if you can try it out.
> 
>     Best regards, Ilya Maximets.
> 
>     >
>     > Ilya Maximets <i.maxim...@ovn.org <mailto:i.maxim...@ovn.org> 
> <mailto:i.maxim...@ovn.org <mailto:i.maxim...@ovn.org>>> 于2023年2月22日周三 
> 03:53写道:
>     >
>     >     On 2/16/23 02:28, 张祖建 via discuss wrote:
>     >     > Hi all,
>     >     > I'm investigating packet drop during ovs restart/upgrade and 
> found that the
>     >     > Gevene interface genev_sys_6082 was deleted and recreated during 
> ovs-vswitchd
>     >     > starts up:
>     >     >
>     >     >
>     >     > root@node1:/root# ip -c a show genev_sys_6081
>     >     > 17: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 
> qdisc noqueue master ovs-system state UNKNOWN group default qlen 1000
>     >     >     link/ether fa:1e:c7:a8:da:49 brd ff:ff:ff:ff:ff:ff
>     >     > root@node1:/root# ip monitor dev genev_sys_6081
>     >     > 17: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 
> qdisc noqueue state UNKNOWN group default
>     >     >     link/ether fa:1e:c7:a8:da:49 brd ff:ff:ff:ff:ff:ff
>     >     > 17: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 
> qdisc noqueue state UNKNOWN group default
>     >     >     link/ether fa:1e:c7:a8:da:49 brd ff:ff:ff:ff:ff:ff
>     >     > 17: genev_sys_6081: <BROADCAST,MULTICAST> mtu 65000 qdisc noqueue 
> state DOWN group default
>     >     >     link/ether fa:1e:c7:a8:da:49 brd ff:ff:ff:ff:ff:ff
>     >     > Deleted 17: genev_sys_6081: <BROADCAST,MULTICAST> mtu 65000 qdisc 
> noop state DOWN group default
>     >     >     link/ether fa:1e:c7:a8:da:49 brd ff:ff:ff:ff:ff:ff
>     >     > ^C
>     >     > root@node1:/root# ip -c a show genev_sys_6081
>     >     > 18: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 
> qdisc noqueue master ovs-system state UNKNOWN group default qlen 1000
>     >     >     link/ether 7a:b4:13:b8:c0:4f brd ff:ff:ff:ff:ff:ff
>     >     >
>     >     >
>     >     > Is this behavior by design? How can I avoid tunnel interface 
> recreation?
>     >
>     >     Hi.
>     >
>     >     No, that should not happen in general.  Ports should not be deleted
>     >     and re-created on restart.
>     >
>     >     What version of OVS you have?  There was a bug in v2.15.0 that could
>     >     cause this kind of behavior.
>     >
>     >     Best regards, Ilya Maximets.
>     >
> 

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