[ovs-discuss] Reg. vxlan tunnel port

ESWAR RAO eswar7028 at gmail.com
Tue Dec 17 14:56:43 UTC 2013


Hi Lori,

Thanks for the response.

If we have multiple configured tunnel ports on the OVS bridge, are there
any listening threads on those ports??
Can I have some pointers in the code where I can see how the packet is
handled to a tunnel port among the available tunnel ports??

Thanks
Eswar Rao

On Tue, Dec 17, 2013 at 7:02 PM, Lori Jakab <lojakab at cisco.com> wrote:

> On 12/17/13 2:54 PM, ESWAR RAO wrote:
>
>> Hi All,
>>
>> I have OVS bridge (br-int) on 3 different machines (
>> 192.168.100.101/102/103 <http://192.168.100.101/102/103>).
>>
>> I have created tunnel ports on these 3 machines using:
>>
>> # ovs-vsctl add-port br-int tun0 -- set interface tun0 type=vxlan
>> options:remote_ip=192.168.100.102 options:key=<vni>
>> ====> port number:2
>>
>> If my understanding is not wrong, if we have multiple tunnel ports on
>> br-int, the packet goes to a tunnel port based on vni.
>>
>
> If you mean received packet, then yes.  If you create a vxlan tunnel with
> a key set, then only VXLAN packets with that VNI will be received on the
> port.  The default key/VNI is 0.
>
> If you mean sent packets, then packets go to a certain tunnel port based
> on existing flows.
>
>
>
>> I want to understand how ovs-vswitchd passes a packet from remote node to
>> a tunnel port.
>> Also does ovs-vswitchd uses the vxlan_udp_port for any of the
>> processing???
>>
>
> A listening UDP socket is opened on the configured port.
>
> HTH,
> -Lori
>
>
>> Thanks
>> Eswar Rao
>>
>>
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>>
>
>
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