Operating System: All
Platform: All

I did a little experiment using stable lithium and this is possibly an issue in Be, but I'm not sure.

it seems that the neutron port is not getting deleted as far as odl goes and that is what odl needs in order to stop the periodic mac resolver. So possibly an issue in neutron northbound.

–

vagrant@devstack-control:~/devstack$ cd /home/vagrant/devstack/
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ source openrc admin admin
vagrant@devstack-control:~/devstack$ keystone user-create --name=user1 --pass=user1 --email=user1@example.com 2> /dev/null
vagrant@devstack-control:~/devstack$ keystone user-role-add --user=user1 --role=member --tenant=tenant1 2> /dev/null
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ TNT1_ID=$(keystone tenant-list 2> /dev/null | grep '\s'tenant1'' | awk '

')
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ ## neutron net-create ext --shared --provider:network_type flat --router:external --provider:physical_network physnetext
vagrant@devstack-control:~/devstack$ neutron net-create ext --provider:network_type flat --router:external --provider:physical_network physnetext
Created a new network:
---------------------------------------------------------------+

---------------------------------------------------------------+

---------------------------------------------------------------+
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ neutron subnet-create \
> --allocation-pool start=192.168.111.21,end=192.168.111.40 --gateway=192.168.111.254 \
> --disable-dhcp --name subext ext 192.168.111.0/24
Created a new subnet:
-----------------------------------------------------------------------+

-----------------------------------------------------------------------+

-----------------------------------------------------------------------+
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ unset SERVICE_TOKEN SERVICE_ENDPOINT
vagrant@devstack-control:~/devstack$ export OS_AUTH_URL=http://192.168.50.20:35357/v2.0/
vagrant@devstack-control:~/devstack$ export OS_REGION_NAME=RegionOne
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ ####=================
vagrant@devstack-control:~/devstack$
vagrant@devstack-control:~/devstack$ export OS_USERNAME=user1
vagrant@devstack-control:~/devstack$ export OS_TENANT_NAME=tenant1
vagrant@devstack-control:~/devstack$ export OS_PASSWORD=user1
vagrant@devstack-control:~/devstack$ export PS1='[\u@\h \W(keystone_user1)]\$ '
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$ rm -f id_rsa_demo* ; ssh-keygen -t rsa -b 2048 -N '' -f id_rsa_demo > /dev/null
[vagrant@devstack-control devstack(keystone_user1)]$ nova keypair-add --pub-key id_rsa_demo.pub demo_key > /dev/null
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$ neutron router-create rtr1
Created a new router:
-----------------------------------------------------------+

-----------------------------------------------------------+

-----------------------------------------------------------+
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$ neutron router-gateway-set rtr1 ext
Set gateway for router rtr1
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$ neutron router-gateway-clear rtr1
Removed gateway from router rtr1
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$
[vagrant@devstack-control devstack(keystone_user1)]$ neutron router-delete rtr1
Deleted router: rtr1

[vagrant@devstack-control devstack(keystone_user1)]$ curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/ports
{
"ports" : [ {
"id" : "0f8f35f1-5248-417a-a5d1-ad180049fca4",
"network_id" : "0ec9caf4-ee01-477b-98f5-691047247aa0",
"name" : "",
"admin_state_up" : true,
"mac_address" : "FA:16:3E:8F:35:28",
"fixed_ips" : [

],
"device_id" : "8b28cdc9-2b32-429e-b08b-f61e19b29057",
"device_owner" : "network:router_gateway",
"tenant_id" : "8fa577a7028e4ac69246e1edc814b35e",
"security_groups" : [ ],
"allowed_address_pairs" : [ ],
"binding:host_id" : "",
"binding:vnic_type" : "normal",
"binding:vif_type" : "unbound",
"binding:vif_details" : [ {
} ]
} ]
}[vagrant@devstack-control devstack(keystone_user1)]$ exit
logout
Connection to 127.0.0.1 closed.

[Flavios-MBP:devstack-nodes-liberty.git] (liberty)$ vagrant ssh
vagrant@devstack-control:~$ cd devstack/
vagrant@devstack-control:~/devstack$ source openrc admin admin
vagrant@devstack-control:~/devstack$ neutron subnet-list
----------------------------------------------------------------------------------------------------------------+

----------------------------------------------------------------------------------------------------------------+

----------------------------------------------------------------------------------------------------------------+
vagrant@devstack-control:~/devstack$ neutron subnet-delete subext
Deleted subnet: subext

vagrant@devstack-control:~/devstack$ curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/ports
{
"ports" : [ {
"id" : "0f8f35f1-5248-417a-a5d1-ad180049fca4",
"network_id" : "0ec9caf4-ee01-477b-98f5-691047247aa0",
"name" : "",
"admin_state_up" : true,
"mac_address" : "FA:16:3E:8F:35:28",
"fixed_ips" : [

],
"device_id" : "8b28cdc9-2b32-429e-b08b-f61e19b29057",
"device_owner" : "network:router_gateway",
"tenant_id" : "8fa577a7028e4ac69246e1edc814b35e",
"security_groups" : [ ],
"allowed_address_pairs" : [ ],
"binding:host_id" : "",
"binding:vnic_type" : "normal",
"binding:vif_type" : "unbound",
"binding:vif_details" : [ {
} ]
} ]
}
vagrant@devstack-control:~/devstack$ neutron port-list

vagrant@devstack-control:~/devstack$

I tested this using today's (Jan/26/16) Beryllium and Lithium and have convinced myself that this is working
as expected. The critical event that needs to happen is the neutron port delete. Once that happens, the following
code path takes place:

PortHandler::doNeutronPortDeleted() ->
NeutronL3Adapter::handleNeutronPortEvent() ->
GatewayMacResolverService::stopPeriodicRefresh() ->
GatewayMacResolverService::resetFlowToRemove()

There is another issue at play here which makes this a lower priority: unstack vs. neutron port clear.
To make the code path mentioned above happen, I did these commands:

karaf> log:set debug org.opendaylight.ovsdb.openstack.netvirt.providers.openflow13.services.arp.GatewayMacResolverService

https://gist.github.com/6848cb3941271cc159ba

source openrc admin admin
neutron net-create ext --provider:network_type flat --router:external --provider:physical_network physnetext

neutron subnet-create --allocation-pool start=192.168.111.21,end=192.168.111.40 --gateway=192.168.111.254 \
--disable-dhcp --name subext ext 192.168.111.0/24

neutron router-create rtr1
neutron router-gateway-set rtr1 ext

1. neutron ports known to ODL are shown here: https://gist.github.com/db246ca1e4daed2dca4c

1. to remove neutron port used as router interface
   neutron router-gateway-clear rtr1

1. neutron ports are indeed removed after the command above
   vagrant@devstack-control:~$ curl -u admin:admin http://192.168.50.1:8080/controller/nb/v2/neutron/ports { "ports" : [ ] }

output when I ran test against Lithium: https://gist.github.com/13824b02224ec343765f

karaf log when neutron port is removed shows the timer being stopped: https://gist.github.com/afe90432d8d8144dee0c

That is different than ./unstack, which makes no attempt in clearing the config in ODL.
The reconcile code would remove this port once neutron re-connects to ODL, but short of that
happening, there is not much ODL can do to differentiate unstack from a temporary disconnect
in the networking-odl side.

Last point to make here is that ODL gateway resolver code reacts to neutron callbacks, not OVS. That is because mac resolver is made to be resilient enough to change br-ex every 10 seconds until it succeeds.