Disable port security at network level

Change-Id: Ia36d116b6de6036161b1c13fda45fd514bd9e56c

diff --git a/Release6/disable_port_security_network.md b/Release6/disable_port_security_network.md
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+# Disable Port Security at Network Level #
+
+## Proposer ##
+- Syed Anwar (VMware)
+- Ravindran Ganapathi (VMware)
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+IM,RO
+
+## Description ##
+
+We have found that with VMware Integrated Openstack 5.1 + NSX T + ENS current OSM deployment
+fails due to port security not supported by ENS.
+
+Failure point in OSM is when creating the network on openstack,
+we observed that manual network creation in openstack also fails with error
+'Port security is not supported on ENS Transport zones'
+
+However we were able to create network manually in openstack using --disable-port-security
+option while creating the network.
+But we do not have any option in OSM IM to specify disable port security at the network level.
+
+From the openstack documentation we can see that by default when the network is created
+port security is always enabled,
+
+--enable-port-security
+Enable port security by default for ports created on this network (default)
+
+--disable-port-security
+Disable port security by default for ports created on this network
+
+
+From OSM in the current vnfd IM we can find that we have the option to disable port security
+but that works only at the connection point / port level.
+
+Also in OSM there is an advanced configuration parameter that can be passed while registering the VIM in OSM,
+i.e. no_port_security_extension but even that is applied only when creating ports and not networks.
+
+There needs to be a mechanism using which we can disable port security by default for ports
+created on a networks for openstack deployments using OSM.
+
+## Design ##
+Design pad: https://osm.etsi.org/pad/p/feature7326
+
+## Demo or definition of done ##
+
+We should be able to instantiate a NS via OSM by specifying the option to disable port security
+while network creation on an VMware Integrated Openstack VIM which is configured with NSX T + ENS.