External segment update complains with router id issue

GBP APIC Opflex plugin
I created an external segment and tried to update it. The update failed
Scenario 2: 2 step process

gbp external-segment-delete TestL3-Out
Deleted external_segment: TestL3-Out
akalambu@akalambu-VM:~/gbpdev0612/rally$ gbp external-segment-create TestL3-Out
Created a new external_segment:
+--------------------------+--------------------------------------+
| Field | Value |
+--------------------------+--------------------------------------+
| cidr | 20.20.1.0/24 |
| description | |
| external_policies | |
| external_routes | |
| id | 8f279438-d437-42da-b4bb-dd11ccc28b7f |
| ip_version | 4 |
| l3_policies | |
| name | TestL3-Out |
| port_address_translation | False |
| shared | False |
| subnet_id | |
| tenant_id | 2cb7d4e22050437890a64734d25824be |
+--------------------------+--------------------------------------+
akalambu@akalambu-VM:~/gbpdev0612/rally$ gbp external-segment-update TestL3-Out --external-route destination=0.0.0.0/0,nexthop=20.20.1.2

Traceback:
2015-08-19 11:12:01.514 17158 TRACE gbpservice.neutron.services.grouppolicy.policy_driver_manager ApicResponseNotOk: APIC responded with HTTP status 400: Bad Request, Request: '/mo/uni/tn-l3_test.json, data={"fvTenant": {"attributes": {"rn": "tn-l3_test"}, "children": [{"l3extOut": {"attributes": {"rn": "out-TestL3-Out"}, "children": [{"l3extLNodeP": {"attributes": {"rn": "lnodep-os-lnode"}, "children": [{"l3extRsNodeL3OutAtt": {"attributes": {"rn": "rsnodeL3OutAtt-[topology/pod-1/node-102]"}, "children": [{"ipRouteP": {"attributes": {"rn": "rt-[0.0.0.0/0]"}, "children": [{"ipNexthopP": {"attributes": {"rn": "nh-[20.20.1.2]"}, "children": []}}]}}]}}]}}]}}]}}', APIC error code 1: Invalid Configuration : Router ID 0.0.0.0 is not Allowed.
2015-08-19 11:12:01.514 17158 TRACE gbpservice.neutron.services.grouppolicy.policy_driver_manager
2015-08-19 11:12:01.515 17158 ERROR neutron.api.v2.resource [req-85c95b30-3d12-4a46-a7ff-5d8aa2105914 None] update failed
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource Traceback (most recent call last):
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/neutron/api/v2/resource.py", line 87, in resource
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource result = method(request=request, **args)
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/neutron/api/v2/base.py", line 538, in update
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource obj = obj_updater(request.context, id, **kwargs)
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/neutron/common/log.py", line 34, in wrapper
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource return method(*args, **kwargs)
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/gbpservice/neutron/services/grouppolicy/plugin.py", line 1228, in update_external_segment
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource policy_context)
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/gbpservice/neutron/services/grouppolicy/policy_driver_manager.py", line 328, in update_external_segment_postcommit
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource context)
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/site-packages/gbpservice/neutron/services/grouppolicy/policy_driver_manager.py", line 134, in _call_on_drivers
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource method=method_name
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource GroupPolicyDriverError: update_external_segment_postcommit failed.
2015-08-19 11:12:01.515 17158 TRACE neutron.api.v2.resource
2015-08-19 11:12:01.517 17158 INFO neutron.wsgi [req-85c95b30-3d12-4a46-a7ff-5d8aa2105914 None] 172.29.172.181 - - [19/Aug/2015 11:12:01] "PUT /v2.0/grouppolicy/external_segments/8f279438-d437-42da-b4bb-dd11ccc28b7f.json HTTP/1.1" 500 332 0.137263

My neutron.conf

[apic_external_network:TestL3-Out]
switch=102
cidr_exposed=20.20.1.0/24
gateway_ip=20.20.1.2
port=1/1
router_id=20.20.0.1