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

Dumitru Ceara dceara at redhat.com
Tue Nov 10 11:46:54 UTC 2020


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



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