Communication system and communication control device

A communication system comprising:

• a user data plane (U-plane) controller for performing a transfer process for a data packet using a U-plane through which the data packet is passed;
• and
• a control plane (C-plane) controller for managing routing information of the U-plane controller using a C-plane through which a routing protocol packet and a control message including a routing table update request are passed, and notifying the U-plane controller of the routing table update request;
• a network having C/U separation being composed of the U-plane controller and the C-plane controller;
• and
• a unified C/U user router that performs both the management of routing information and a transfer process for the data packet being connected to the U-plane controller;
• wherein the U-plane controller includes:
• a routing table for transferring the data packet to a destination;
• a communication control processing section for analyzing the content of a received packet;
• a routing protocol processing section for intermediating an exchange of routing information between the unified C/U user router and the C-plane controller, without reflecting the content of the received packet to the routing table of its own, if analyzed content of the received packet is a routing protocol;
• and
• a routing information update processing section for updating the routing table of its own in accordance with the routing table update request, if the analyzed content of the received packet is the routing table update request notified from the C-plane controller.