diff --git a/vmtp/network.py b/vmtp/network.py
index 35bcbe4..1625d1a 100644
--- a/vmtp/network.py
+++ b/vmtp/network.py
@@ -377,14 +377,16 @@ class Network(object):
             hostname = agent['host']
             if 'Linux bridge' in agent_type:
                 agent_detail = self.neutron_client.show_agent(agent['id'])['agent']
-                ifname = agent_detail['configurations']['interface_mappings']['physnet1']
-                internal_iface_dict[hostname] = ifname
+                if 'physnet1' in agent_detail['configurations']['interface_mappings']:
+                    ifname = agent_detail['configurations']['interface_mappings']['physnet1']
+                    internal_iface_dict[hostname] = ifname
             elif 'Open vSwitch' in agent_type:
                 network_type = self.vm_int_net[0]['provider:network_type']
                 agent_detail = self.neutron_client.show_agent(agent['id'])['agent']
                 if network_type == "vlan":
-                    brname = agent_detail['configurations']['bridge_mappings']['physnet1']
-                    internal_iface_dict[hostname] = brname
+                    if 'physnet1' in agent_detail['configurations']['bridge_mappings']:
+                        brname = agent_detail['configurations']['bridge_mappings']['physnet1']
+                        internal_iface_dict[hostname] = brname
                 elif network_type == "vxlan" or network_type == 'gre':
                     ipaddr = agent_detail['configurations']['tunneling_ip']
                     internal_iface_dict[hostname] = ipaddr