Communication method among branches and egress routers of branches

Abstract

The invention discloses a communication method among branches and egress routers of the branches. The method comprises the following steps that: internal routing table entries of each branch are initially configured in the local routing table of an egress router of each branch; when a first egress router of a first branch receives a request message sent by equipment of the first branch, the first egress router searches routing table entries which are matched with the message from the local routing table and forwards the request message to the egress routers of the other branches if the routing table entries which are matched with the message are not discovered; the egress router of any of the other branches receives the request message, searches the routing table entries which are matched with the message from the local routing table, forwards the message according to the routing table entries if the routing table entries which are matched with the message are discovered, and returns the routing table entries to the first egress router; and the first egress router adds the routing table entries into the local routing table of the first egress router. With the adoption of the communication method among the branches and the egress routers of the same, useless routing table entries are prevented from being stored on the egress routers of the branches.

Description

technical field [0001] The invention relates to the technical field of data transmission, in particular to a communication method between branch offices and an egress router of the branch offices. Background technique [0002] Now there are many small and medium-sized enterprises that have some branches in various places. Each of their branches uses small and medium business (SMB, Small and Medium Business) routers, and then rents the operator's network. Some devices in each branch need to communicate with other branches. device communication. [0003] In the prior art solution, the egress routers of each branch need to learn all the routes on the egress routers of adjacent branches, and establish routing table entries, so that the devices in each branch can communicate with each other. [0004] figure 1 The network diagram of the existing communication between different branches is given, such as figure 1 As shown, the egress router of branch 1 is router A, the egress ro...

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Problems solved by technology

[0005] It is not difficult to see from the above description that the routing table on the egress router of the branch office will be very large, so the pressure on the egress router will be very large; and, if only a small number of devices in each branch office communicate with the equipment of other branch offices, it will cause The routing table entries on the egress router are greatly wasted, and due to the huge routing table entries, it will take a long time to select a route

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