Method for establishing in-band control channel of software defined network (SDN), and device

Abstract

The embodiment of the invention discloses a method for establishing an in-band control channel of a software defined network (SDN), and a device, and relates to the field of communication. A transmission port of an OpenFlow switching device can be recorded to obtain a transmission path of an In-band control message. The method comprises the following steps: establishing and enabling a first flow table, wherein the first flow table is used for indicating to process a message whose destination internet protocol (IP) address is a local IP address by an upper layer protocol; sending an address resolution protocol (ARP) request whose destination IP address is the IP address of an SDN controller, and after ARP response matched with the first flow table is received, recording the port receiving the ARP response as an uplink outlet port; establishing and enabling a second flow table, wherein the second flow table is used for indicating to process a port discovery message by a control layer; after port discovery messages matched with the second flow table and sent by other OpenFlow switching devices are received, recording the IP addresses of the other OpenFlow switching devices, and recording the ports receiving the port discovery messages as downlink outlet ports corresponding to the other OpenFlow switching devices, and forwarding the discovery messages from the uplink outlet port.

Description

technical field [0001] Embodiments of the present invention relate to the communication field, and in particular to a method and device for establishing an in-band control channel of an SDN (Software Defined Networking, software-defined network). Background technique [0002] In the SDN network, the SDN controller usually uses the LLDP (Link Layer Discovery Protocol, Link Layer Discovery Protocol) protocol to detect and discover the network topology between the switching devices, and the switching device uses the ARP (Address Resolution Protocol, Address Resolution Protocol) protocol to discover The SDN controller (host) to which the switching device is connected. However, the operating systems of some servers may not actively send ARP requests, so it is not reliable to simply rely on the server where the SDN controller is located to send ARP requests to obtain the connection relationship of the SDN controller. [0003] The service flow table of the In-band (in-band) networ...

AI Technical Summary

Problems solved by technology

When the SDN system cooperates with the SDN controller and the OpenFlow switching device to establish the forwarding strategy, the mechanism is that the OpenFlow switching device first establishes the forwarding strategy by itself so that each OpenFlow switching device establishes a connection with the SDN controller. When the OpenFlow switching device connects to the controller Afterwards, the in-band control flow table is taken over by the SDN controller and reissued according to the policy of the SDN controller. This method can easily cause the disconnection of the control channel connection during the takeover process and when the OpenFlow switching device fluctuates, resulting in OpenFlow switching devices are separated from the control of the entire SDN controller

In addition, when an OpenFlow switching device establishes a forwarding policy on an in-band network, the control flow table usually delivered is a hidden flow table, which is invisible to the SDN controller. The SDN controller cannot manage the in-band control flow table, nor can it The control packet transmission path cannot be calculated through the control flow table of the in-band network

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