Method and equipment for establishing dynamic GRE (Generic Routing Encapsulation) tunnel

Abstract

The invention discloses a method and equipment for establishing a dynamic GRE (Generic Routing Encapsulation) tunnel. In the method, an active initiating party dynamically obtains a first interface of an IP address and transmits a dynamic GRE tunnel inquiry message carrying a source IP address to a passive receiving party; the passive receiving party authenticates the dynamic GRE tunnel inquiry message and an inquiry response message is transmitted to the active initiating party by the source IP address after the dynamic GRE tunnel inquiry message passes the authentication; the active initiating party transmits a dynamic GRE tunnel UP announcement carrying the source IP address to the passive receiving party by the first interface; and the passive receiving party authenticates the dynamicGRE tunnel UP announcement, an UP announcement response message is transmitted to the active initiating party by the source IP address after the dynamic GRE tunnel UP announcement passes the authentication, and the dynamic GRE tunnel between the first interface and a second interface is established. The invention realizes the establishment of the dynamic GRE tunnel by dynamically obtaining the interfaces of the IP address and the backup of the dynamic GRE tunnel.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and equipment for establishing a dynamic GRE tunnel. Background technique [0002] With the development of 3G (3rd-generation, third-generation mobile communication technology) networks, users have more and more requirements for service applications under the 3G network, and the requirement for 3G network link backup also follows. The link backup technology in the traditional network includes GRE (Generic Routing Encapsulation, general routing encapsulation) tunnel mode and route switching technology. [0003] GRE defines a protocol for encapsulating any other network layer protocol on top of any network layer protocol. GRE encapsulates data packets of certain network layer protocols, so that these encapsulated data packets can be transmitted in another network layer protocol. GRE uses the actual physical interface specified for the tunnel to complete the forwarding, ...

AI Technical Summary

Problems solved by technology

However, since the IP address of the 3G interface is dynamic, a GRE tunnel cannot be established between network equipment A and network equipment B, so the link backup mode of the GRE tunnel cannot be used. At the same time, because the IP address dynamically obtained by the 3G interface cannot be predicted, Network device B also cannot pass the route shown in Figure 2 The switching mechanism dynamically detects whether the main link to network device A is normal, so as to realize the switching of the main link and the standby link

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