[ovs-discuss] 回复: OVN，does OVN support VXLAN EVPN ？

[fangtian at ruijie.com.cn]

Dumitru,
   Thanks for your advice.
   If many clusters connect with each on this way , I am afraid that the ARP flood cant' be controlled. Seems VXLAN EVPN is aimed at this issue ?
   It's faraway from success now,so I asked advice here.
Tian.

-----邮件原件-----
发件人: Dumitru Ceara <dceara at redhat.com> 
发送时间: 2020年11月10日 19:47
收件人: 方田(云桌面 北京) <fangtian at ruijie.com.cn>; ovs-discuss at openvswitch.org
主题: Re: [ovs-discuss] OVN，does OVN support VXLAN EVPN ？

On 11/10/20 11:14 AM, fangtian at ruijie.com.cn wrote:
> HI all，
> 

Hi Tian,

>      Currently I want to make a Poc of VXVLAN EVPN with OVN as 
> depicted
> below:
> 
>  
> 
>       LS-1                                    LS-1
> 
>              
> |                                                                     
> ||
> 
>       br-int                                  br-int
> 
>            |                                       |
> 
>        patch port patch port
> 
>            |                                       |
> 
>          br-vxlan -------vxlan tunnel------------br-vxlan
> 
> --------------                          ------------
> 
>    OVN Cluster-1                           OVN-Cluster-2
> 
>         |                                       |
> 
>         -------------MPBGP-control-plane-------
> 
>  
> 
> I want the two logical switches of the two clusters on the same 
> VLAN,so the VMs in the two clusters can reach at each other through L2 
> communication .

Maybe it's because I don't know the whole motivation behind this but wouldn't it be an option to have a single OVN cluster?  OVN supports VXLAN encapsulation for non-vtep natively since version 20.09:

https://github.com/ovn-org/ovn/commit/b07f1bc3d068e231e40840b0d977bd57158987fd

> 
> Gobpg can act as the MPBGP controller, but I don’t know how to setup 
> the OVN .
> 

If I understand the requirement correctly, I think having a localnet port on LS-1 (on both clusters) connected to br-vxlan would be enough.
Each of the clusters would see the other as a provider network (an extension of the L2 domain).

>  
> 
> Do I need to add some flow tables via ovn-sbctl ,such as ARP response ?
> 

Did you already try it out?  Would it be possible to share the OVN and OVS DBs of the two clusters?

>  
> 
> Please advise, thanks much.
> 

Regards,
Dumitru