Message forwarding method and device based on service function chain

Abstract

The invention provides a message forwarding method and device based on a service function chain. The method comprises the following steps: identifying a local VPN virtual local area network of a tenant to which a received first Ethernet message belongs; searching a global VPN ID mapped to the local VPN in the VPN mapping relationship of the tenant; searching a first service function chain node based on the service function chain forwarding table; packaging the first Ethernet message into a first NSH message with a first NSH network service header according to the found first service function chain node, wherein the first NSH head carries a global VPN ID; searching a first virtual extensible local area network (VXLAN) tunnel reaching the first service function link node in a forwarding instance of the service function link domain; and packaging the first NSH message into a first VXLAN message according to the first VXLAN tunnel, and sending the first VXLAN message through an output portof the first VXLAN tunnel.

Description

technical field [0001] The present application relates to communication technology, in particular to a message forwarding method and device based on service function chains. Background technique [0002] SFC (Service Function Chain, business function chain) is a technology that provides orderly services to the application layer. SFC is used to logically connect services on network devices to form an orderly service combination. The SFC realizes that the packets pass through the service device sequentially according to the specified path by adding the service chain path information to the original packet. [0003] figure 1 Shown is the SDN network architecture applying the SFC technology, the network device 11-15 is located in the SFF (Service Function Forwarder, service function forwarding node) of the SFC domain, and the SDN controller is connected to the network device 11-15 through the link shown by the dotted line . The network devices 11-15 in the SFC domain need to...

AI Technical Summary

Problems solved by technology

[0004] In this way, in figure 1 The problem in the network shown is that when the tenants are configured in different VPNs (Virtual Private Networks) at different sites, the data packets sent by the tenants are controlled along the SDN (Software Defined Network) in the SFC domain After the SFP (Service Function Path, service function path) set by the server is forwarded by the SFC domain VPN, when the data packet of the tenant reaches another site, the VPN information of the data packet sent by the tenant is lost, and it is impossible to determine the site where the data packet should finally arrive. Which VPN is forwarded to the tenant

However, because device 13 can only obtain the global VPN identifier of the SFC domain from the arriving packets, it cannot obtain the local VPN information of tenant 1, and cannot send the received packets to tenant 1 in the local VPN, resulting in forwarding failure.

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