[ovs-discuss] OVN external network access in Openstack

[Joel Wirāmu Pauling]

Why not just use ECMP for the gateway pool?

On 17 November 2016 at 08:47, Russell Bryant <russell at ovn.org> wrote:

>
>
> On Wed, Nov 16, 2016 at 12:38 PM, Michael Kashin <mmkashin at gmail.com>
> wrote:
>
>> Greetings,
>>
>> I'm integration RDO (Packstack) Openstack with OVN and facing a problem
>> connecting DVR to external networks. My setup consists of a couple of
>> virtual networks and a router interconnecting them.  On each compute node
>> I've create a "br-ex" and created a mapping "ovn-bridge-mappings=extnet:br-ex".
>> I've also created a neutron network with "--provider:physical_network
>> extnet" and assigned this network as a gateway to my router. I can see that
>> OVN northDB creates a new LS with two ports as expected:
>>
>>  switch 151ac068-ee99-4324-b785-40709b2e2061
>> (neutron-b4786af5-cf70-4fc2-8f36-e9d540165d37)
>>
>>         port provnet-b4786af5-cf70-4fc2-8f36-e9d540165d37
>>
>>             addresses: ["unknown"]
>>
>>         port fb73ca73-488f-40aa-89e1-e8e312de7a77
>>
>>             addresses: ["fa:16:3e:1d:75:66 169.254.0.50"]
>>
>> However, I can't see any link between my DVR and this LS. Am I expected
>> to create a DVR-to-extLS patch manually?
>>
> What version of networking-ovn are you using?  To do this, you need
> networking-ovn from master (ocata).
>
>> Can you also clarify one more thing. I've seen the setting for L3 gateway
>> scheduling which, I assume, should place that external router IP
>> (169.254.0.50 in my case) on a particular compute node. Is there any
>> document that describes what happens during GW scheduling?
>>
> Right now scheduling is primitive.  It uses a "least loaded" scheduling
> policy to distribute gateways among the available chassis.  There are some
> obvious enhancements that need to be made.
>
> 1) We need to be able to specify only a subset of hosts that should be
> used as gateways.
>
> 2) We need some HA capabilities to handle when a host handling a gateway
> goes down.
>
> --
> Russell Bryant
>
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>
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