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No host found Devstack

Hi I have installed Openstack using devstack on a single node with Ubuntu 12.04 64 bit as the Operating system. Everything works when I run stack.sh with the following localrc file.

enable_service s-proxy s-object s-container s-account

enable neutron

disable_service n-net enable_service q-svc enable_service q-agt enable_service q-dhcp enable_service q-l3 enable_service q-meta enable_service q-metering enable_service q-lbaas

Optional, to enable tempest configuration as part of DevStack

enable_service tempest

But when I try to enable Vlan by adding the following line in the localrcfile ML2_VLAN_RANGES=physnet1:100:200,physnet2:300 The installation works fine but when i launch an instance it give the error "No Valid Hosts Found"

Is there anything I need to add to the localrc file to enable vlans