Instance is unable to get IP

Hi All,

I have installed Openstack Ocata on ubuntu with 3 node(controller,compute,cinder). My instance is not getting IP from dhcp server. I have used provider network. here i am copying logs for instance after launching

cirros-ds 'local' up at 9.42
no results found for mode=local. up 9.86. searched: nocloud configdrive ec2
Starting network...
udhcpc (v1.20.1) started
Sending discover...
Sending discover...
Sending discover...
Usage: /sbin/cirros-dhcpc <up|down>
No lease, failing
WARN: /etc/rc3.d/S40-network failed
cirros-ds 'net' up at 191.31
checking http://169.254.169.254/2009-04-04/instance-id
failed 1/20: up 191.70. request failed
failed 2/20: up 194.15. request failed
failed 3/20: up 196.39. request failed
failed 4/20: up 198.72. request failed
failed 5/20: up 200.88. request failed
failed 6/20: up 203.24. request failed
failed 7/20: up 205.46. request failed
failed 8/20: up 207.62. request failed
failed 9/20: up 209.95. request failed
failed 10/20: up 212.16. request failed
failed 11/20: up 214.32. request failed
failed 12/20: up 216.73. request failed
failed 13/20: up 218.92. request failed
failed 14/20: up 221.10. request failed
failed 15/20: up 223.45. request failed
failed 16/20: up 225.62. request failed
failed 17/20: up 227.81. request failed
failed 18/20: up 230.19. request failed
failed 19/20: up 232.38. request failed
failed 20/20: up 234.56. request failed
failed to read iid from metadata. tried 20
no results found for mode=net. up 236.97. searched: nocloud configdrive ec2
failed to get instance-id of datasource
Top of dropbear init script
Starting dropbear sshd: failed to get instance-id of datasource
WARN: generating key of type ecdsa failed!
OK

all services are working ok when I am verifing them..

Not able to find any error and warning in logs..