Distributed access multiplexer (DAM) stacked network system and device
A technology for accessing multiplexers and overlay networks, applied in the field of communication, can solve the problems of inability to DAM overlay network automatic discovery and signaling mechanism, and cannot be supported, and achieves the effect of improving sustainability
Inactive Publication Date: 2017-05-31
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology
The existing IETF (Internet Engineering Task Force) L2VPN / VPLS (Layer 2 Virtual Private Network Service / Virtual Private Local Area Network Service) signaling protocol only supports MPLS-in-MPLS or MPLS-in-IP tunnel types due to its design , Cannot support other mainstream NVO3 (three-layer-based network virtualization) tunnel types, and cannot be used as an automatic discovery and signaling mechanism for DAM overlay networks without expansion
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[0021] In the following detailed description of the preferred embodiments, reference will be made to the attached drawings constituting a part of the present invention. The attached drawings illustrate specific embodiments capable of implementing the present invention by way of example. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the present invention.
[0022] The following embodiments adopt the framework and terminology of IETF NVO3 to describe the distributed access multiplexer DAM, and take the L2 service based on the NVO3 architecture as an example for description.
[0023] figure 2 It is the scene of distributed DAM internal border gateway protocol BGP signaling message communication provided by the present invention. In the figure, it is the IETF NVO3 framework to construct and maintain the network virtualization overlay network inside the distributed DAM. Generally, the IETF NVO3 framework is designed as an application env...
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The invention provides an automatic finding method and device for a distributed access multiplexer (DAM) stacked network entity. Routing information is exchanged between the network entities via BGP messages; the BGP message can be a UPDATE message comprising a plurality of attributes to support routing information exchange between the network entities; a mapping table between virtual network examples and corresponding network virtualization channels is generated, and a stacking channel between the network entities is built according to the table. The UPDATE message can comprise an MP_REACH_NLRI attribute used for releasing information of reachable target networks and corresponding next-hop information and transmitting the context identifier of a virtual network under the virtual network example; a two-layer VPN identifier extension group attribute used for identifying the specific virtual network example in a DAM system; and a BGP packaging extension group attribute used for indicating channel type of channel packaging. The method and the device provided by the invention can support deployment of an access module at the position close to a user and virtualization of a central module, the provided automatic finding signaling mechanism can coexist with existing L2VPN / VPLS signaling, and sustainability of equipment is enhanced.
Description
Technical field [0001] The present invention relates to the field of communication technology, in particular to a distributed access multiplexer DAM overlay network system and its device. Background technique [0002] The trend of the next generation of DAM (Access Multiplexer: Distributed Access Multiplexer) is to support a more distributed architecture and support more functional virtualization, figure 1 Shows the deployment model of distributed DAM, which mainly contains 4 types of modules: ERM module (edge router module), which runs IP / MPLS data plane functions; CPM module (control plane module), which runs control plane and management plane functions; SPM (Service Plane Module), which runs business and application functions; RAM modules RAM1, RAM2, RAM3 (Remote Access Module), which terminate various special access layer technologies near customers, such as: DOCSIS (Wired Cable data service interface specification) cable access technology, EPON (Ethernet Passive Optical Ne...
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Login to View More IPC IPC(8): H04L12/931H04L12/933
CPCH04L49/1523H04L49/1507H04L49/354
Inventor 张立新
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD