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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+================
+1. vRNC Topology
+================
+
+The simple vRNC topology is shown below: |vRNC Topology|
+
+-  vRNC includes four networks: EMS\_network, CTRL\_network,
+   Intermedia\_network and extermedia\_network;
+-  vRNC includes four node types: MM, LB, CM and DM;
+-  MM: Stands for Maintain Module, which links to EMS\_network,
+   CTRL\_network and extermedia\_network. It composes of active vdu and
+   standby vdu.
+-  CM: Stands for Control Module, which links to CTRL\_network and
+   intermedia\_network. All CM nodes form resource pool and each node
+   composes of active vdu and standby vdu.
+-  DM: Stands for Data Module, which links to CTRL\_network and
+   intermedia\_network. All DM nodes form resource pool and each node is
+   a vdu.
+-  LB: Stands for LineCard Module, which links to CTRL\_network and
+   intermedia\_network and extermedia\_network. All LB nodes form
+   resource pool and each node is a vdu.
+
+2. vRNC Definition
+==================
+
+The files dependency and correspoding specificaiton of vRNC definition
+are shown below: |vRNC Definition|
+
+-  TOSCA\_definition\_1.0.yaml should be the lastest version, which is
+   updated by tosca-parser community, but some keywords (such as
+   substitution\_mappings) in the correspoding standard of
+   "TOSCA-simple-profile-YAML-v1.0" is not supported.
+-  TOSCA\_nfv\_definition\_1.0.yaml is a new file, and not implemented
+   in code, and the correspoding standard of
+   "tosca-nfv-v1.0-wd02-rev02" is not complete now.
+
+.. |vRNC Topology| image:: image/vRNC_Topology.bmp
+.. |vRNC Definition| image:: image/vRNC_Definition.bmp