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Hi Yuanle,
I had working environment of Havana (GRE & OVS) in Ubuntu 12.04 with two external networks, two routers and two l3 agents before a month. I have used host parameter to differentiate l3 agents and started it in same node.
But now when i repeat the same I am facing the issue, when i start the second l3 agent it removes the first l3 agents port. I have no clue on this. My question is, can I use your method of mapping router ID in l3 agents for the same ?
Please suggest me
Thanks in advance,Boopathy K
Date: Thu, 6 Mar 2014 11:00:29 +0800
From: sylecn at gmail.com
To: gfa at zumbi.com.ar
CC: openstack at lists.openstack.org
Subject: Re: [Openstack] [openstack] [neutron] how to config one l3 agent for each l3 router?

Hi all,

I have get this working this morning. The settings have no problem, but I didn't get the order right on first try.

Here is the correct order:
1. create network resources, but do not connect them to router yet.

   create ext-net, net1/subnet1, net2/subnet2
2. create router1
3. config router_id in l3-agent1, restart l3-agent1
5. create router2
6. config router_id in l3-agent2, restart l3-agent2
7. add ports to the router, namely:

   run router-interface-add and router-gateway-set for router1;
   run router-interface-add and router-gateway-set for router2.

The key point is do not add any port to router until you have set router_id in all l3-agents and restart them.


On first try, I have run router-gateway-set too early for router2.

Thanks Ageeleshwar, Gustavo for your advices.

To Gustavo: I set different router_id in different l3_agent.ini, that's the whole point of this setup.


To Ageeleshwar: I am aware of that setup. Note however, in my setup, two routers share the ext-net, they just use different l3-agent to do NAT. This is a little different from using two ext-nets and two router. Because neutron could not infer which l3-agent to use by the ext-net id when you do router-gateway-set. I have tried two ext-net with two router setup before, it works as expected. So that information should be helpful for others. Make sure in gateway_external_network_id config, you should use uuid instead of ext-net name though.



YY Inc. is hiring openstack and python developers. Interested? Check http://www.nsbeta.info/jobs


--
Thanks,
Yuanle



On Thu, Mar 6, 2014 at 4:10 AM, gustavo panizzo <gfa> <gfa at zumbi.com.ar> wrote:

you may want to look at this thread



https://www.mail-archive.com/openstack@lists.openstack.org/msg03984.html



is not what you ask for, but is the closest thing i've seen



also check if your pkgs have this patch applied



https://review.openstack.org/#/c/59359/





On 03/05/2014 09:21 AM, sylecn wrote:

>

> I started two l3 agents on two nodes. In l3_agent.ini, I set one l3 agent's

> handle_internal_only_routers to False, I config router_id to be ids of

> the two

> routers. And neutron agent-list show both l3 agents are up.

if you want to an L3 agent to serve just a single router, why put 2

routers in router_id?



>

> Now when I boot instance with a port in subnet2, the traffic still go

> through

> the server that runs l3-agent1.

do you have routers for subnet2 on both nodes?

my bet is l3-agent1 created a router for subnet2, maybe it was started

before l3-agent2





PD: i'm not very experienced with nat router and gre, i use vlan and

external networks



>

> My question is: is this kind of network supported by neutron? Does the

> router_id config means the l3 agent will manage that router only? The only

> document mention its use is when use_namespace is False. In my case, I

> have it

> set to True.

>

> Side note: there is a question on

> https://answers.launchpad.net/neutron/+question/236230 which says it's

> possible to change router's l3 agent, but did not mention how.

>

> Any help is appreciated.

>

> /

> YY Inc. is hiring openstack and python developers. Interested? Check

> http://www.nsbeta.info/jobs/

>

> --

> Thanks,

> Yuanle

>

>

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