[Openstack] [openstack][icehouse][neutron][floatingip][br-ex]

James Denton james.denton at rackspace.com
Thu Oct 16 17:42:08 UTC 2014


The external bridge (br-ex), when set, is used only for the external (qg) port of the router AFAIK and does not need to connect to br-int. The internal interface of the router (qr) is connected to the integration bridge. If floating IPs are working ok, and your router is properly routing traffic to instances, then your configuration is working properly as-is. A provider bridge, like br-eth1, would connect to the integration bridge via a patch port as you’ve described.


From: Chinasubbareddy M <chinasubbareddy_m at persistent.co.in<mailto:chinasubbareddy_m at persistent.co.in>>
Date: Thursday, October 16, 2014 at 11:58 AM
To: "openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>" <openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>>
Subject: [Openstack] [openstack][icehouse][neutron][floatingip][br-ex]


1.       I have successfully configured floating ips  in neutron and everything working fine , but as per the docs there should be int-br-ex and phy-br-int  veth pair should be created  between br-int and br-ex, but  that  is not created in my setup ,floating ip are working fine, Please suggest .

2.       Added one of my nic which has connected to trunk port of switch to br-ex , I would like create multiple external networks and use each one for them for different  tenants or if different tenants wants to create their own floating ip networks ,what is the solution?

Issues I am facing here are:

I . if I add multiple subnets to external network , how to create floating ip from specific subnet?

Ii . can I create multiple external networks with single L3 agent?

iii.  should I create virtual interfaces like eth2.23(23 is vlan)  and add them to br-ex for each vlan?

Correct me if  I am wrong in understanding  floating ip networks in neutron.

Here is my ovs-vsctl output:

ovs-vsctl show
    Bridge br-ex
        Port "em3.29"
            Interface "em3.29"
        Port "qg-01b3854d-fa"
            Interface "qg-01b3854d-fa"
                type: internal
        Port br-ex
            Interface br-ex
                type: internal
    Bridge "br-eth1"
        Port "phy-br-eth1"
            Interface "phy-br-eth1"
        Port "br-eth1"
            Interface "br-eth1"
                type: internal
        Port "em2"
            Interface "em2"
    Bridge br-int
        Port "qr-b70d92cb-cd"
            tag: 2
            Interface "qr-b70d92cb-cd"
                type: internal
        Port "qvoa239a290-cf"
            tag: 2
            Interface "qvoa239a290-cf"
        Port br-int
            Interface br-int
                type: internal
        Port "tapfaa69064-de"
            tag: 5
            Interface "tapfaa69064-de"
                type: internal
        Port "int-br-eth1"
            Interface "int-br-eth1"
        Port "qvo9bce9829-2a"
            tag: 5
            Interface "qvo9bce9829-2a"
        Port "tapd3e11080-82"
            tag: 2
            Interface "tapd3e11080-82"
                type: internal

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