Method, system and router for realizing virtual special network cross-domain

Abstract

The invention discloses a method for realizing virtual special network cross-domain. The method comprises the following steps: a router in a first domain judges whether an encapsulation protocol of a second domain is obtained or not; if so, encapsulation is carried out to the received business data according to the encapsulation protocol of the second domain, and the business data is sent to a router in the second domain; if not, the router in the first domain encapsulates the received business data according to the preset encapsulation protocol and sends an encapsulated data packet to the router in the second domain; and the router in the second domain re-encapsulates and sends out a received data packet according to the encapsulation protocol of the second domain after the data packet is unencapsulated. Through the method, the VPN cross-domain is still realized when different domains respectively adopt different VPN implementations. The invention also discloses a system and a router, both of which are used for realizing the virtual special network cross-domain.

Description

technical field [0001] The present invention relates to a virtual private network, in particular to a method, a system and a router for realizing a cross-domain virtual private network. Background technique [0002] There are many ways to implement virtual private network (VPN) at present, such as multi-protocol label switching virtual private network (MPLS VPN), and VPN realized by point-to-point tunnel, such as IP security tunnel (IPSec) VPN. [0003] If there are multiple domains between two Customer's edge routers (CEs) performing VPN services, data needs to be transmitted across domains. In MPLS VPN, there are various cross-domain modes, including mode A (Option A), mode B (Option B) and mode C (Option C). [0004] by figure 1 There are three domains between CE1 and CE2 as an example, and the method A, method B, and method C are used to illustrate the three VPN cross-domain implementation methods. The two routers in AS1 are provider border router 1 (Provider'sedge ro...

AI Technical Summary

Problems solved by technology

[0010] From the description of the above method B and method C, it can be seen that each domain must adopt MPLS technology, if one of the domains does not use VPN based on MPLS technology , it is impossible to realize VPN cross-domain, and the existing methods have great restrictions on the choice of network technology

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