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Route transmission method and routing device for nesting VPN

A sending method and routing technology, which is applied to data exchange through path configuration, digital transmission systems, electrical components, etc. It can solve system waste, redundant IP routing table private network routing information, and do not allow CE and PE devices to cross layers. access and other issues to achieve the effect of saving system resources

Inactive Publication Date: 2009-05-27
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However in such figure 1 In the symmetric network structure shown, cross-level access between CE and PE devices is not allowed (for example, CE-B2 is not allowed to access CE-C2 and CE-C1), so the next level is stored in the IP routing table VPN private network routing information is redundant, that is, there is no need to store it. The method of sending routes in the prior art will obviously cause system waste

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  • Route transmission method and routing device for nesting VPN
  • Route transmission method and routing device for nesting VPN
  • Route transmission method and routing device for nesting VPN

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The method provided by the present invention mainly includes: before each routing device in the nested VPN network sends routing information to its next hop in the downlink direction, it judges whether the RT attribute corresponding to the routing information to be sent is the next hop stored by itself The subset of the IRT attribute corresponding to the VPN to which it belongs, if yes, the routing information to be sent is sent in the IPv4 route; otherwise, the routing information to be sent is sent in the VPNv4 route.

[0025] figure 2 The detailed method flowchart provided by the embodiment of the present invention, the process of routing device 1 sending routing information to routing device 2 in the downlink direction can be as follow...

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Abstract

The invention provides a route sending method and route equipment applied to a nested virtual private network (VPN), wherein the method comprises the following steps: before sending route information to next hop of the route equipment in a downlink direction, the route equipment in nested VPN networking judges whether the RT attribute corresponding to the route information to be sent is a subset of the route identifier (RT) attribute corresponding to VPN containing the next hop stored by the route equipment; if so, the route information to be sent is carried in an IPv4 route to be sent to the next hop; or else, the route information to be sent is carried in a VPNv4 route to be sent to the next hop. The route sending method and the route equipment can ensure that no useless internal private network route exists in IP routing lists of the route equipment, thereby realizing the removal of redundant routes and saving system resources.

Description

technical field [0001] The invention relates to routing technology in network communication, in particular to a routing sending method and routing equipment applied to a nested virtual private network (VPN). Background technique [0002] Multiprotocol Label Switching Layer 3 Virtual Private Network (MPLS L3VPN) is a Layer 3 technology based on carrier edge equipment (PE) in the service provider VPN solution, which uses Border Gateway Protocol (BGP) in the service provider backbone Publish VPN routes on the Internet, and use MPLS to forward VPN packets on the service provider's backbone network. It uses the route identifier (RT, Route Target) attribute in the BGP extended community attribute to control the publication of VPN routing information, and each routing device determines whether to receive the VPN routing information by matching the RT carried in the received route with the RT attribute stored in itself. Store the route to. [0003] In the basic MPLS L3VPN network,...

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Application Information

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IPC IPC(8): H04L12/56H04L12/46H04L45/24
Inventor 贾欣武
Owner NEW H3C TECH CO LTD