WO2012149850A1 - Procédé, système et routeur s'appuyant sur un routage vpn pour établir un lsp - Google Patents

Procédé, système et routeur s'appuyant sur un routage vpn pour établir un lsp Download PDF

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Publication number
WO2012149850A1
WO2012149850A1 PCT/CN2012/073484 CN2012073484W WO2012149850A1 WO 2012149850 A1 WO2012149850 A1 WO 2012149850A1 CN 2012073484 W CN2012073484 W CN 2012073484W WO 2012149850 A1 WO2012149850 A1 WO 2012149850A1
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WO
WIPO (PCT)
Prior art keywords
enodeb
address
base station
lsp
entry
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Application number
PCT/CN2012/073484
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English (en)
Chinese (zh)
Inventor
邓柱升
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2012149850A1 publication Critical patent/WO2012149850A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]

Definitions

  • the present invention relates to communication networks, and more particularly to a method, system and router for establishing an LSP based on VPN routes. Background technique
  • the wireless network has evolved from 3G (Third Generation) technology to LTE (Long Term Evolution) technology, and the network bandwidth has been greatly improved.
  • LTE technology is also simplified in the network architecture, which is mainly reflected in the evolution of 3G based on ATM/TDM (Asynchronous Transfer Mode) (Time Division Multiplexing) ( A flat network of IP (Internet Protocol, a protocol interconnected between networks).
  • FIG. 1 is a schematic diagram of an existing 3G network.
  • all NodeB (node base station) services are aggregated to the RNC (Radio Network Controller) through the ATM/TDM network.
  • RNC Radio Network Controller
  • FIG. 2 is a schematic diagram of an existing LTE network.
  • the service of the eNodeB (evolved node base station) is aggregated to the S-GW/MME (Mobility Management Entity) (S1 service), and the service between the eNodeB and the eNodeB (X2 service) ).
  • S1 service S-GW/MME (Mobility Management Entity)
  • X2 service mainly used for transmitting data during handover when the terminal performs handover between adjacent base stations, which also means that there is only X2 demand between adjacent base stations and no X2 service interworking between non-adjacent base stations.
  • L3VPN Layer 3 Virtual Private Network
  • the interconnection between the eNodeB and the eNodeB, the eNodeB, and the S-GW/MME is implemented through an L3VPN (Layer 3 Virtual Private Network) network.
  • the PE (Provider Edge)/POP (Point of Provision) node is the edge node where the L3VPN network is connected to the eNodeB and S-GW/MME.
  • the PE node is connected to the eNodeB, and the POP node is connected to the S-GW/MME.
  • a full mesh (full mesh) connection between PEs is built using L3VPN technology.
  • the eNodeB can implement interworking with any S-GW/MME and eNodeB.
  • the technical solution is based on the existing L3VPN technology in the industry and is simple to deploy.
  • the inventors found during the research that the technology has the following two problems.
  • N*(N-1) N is the number of edge nodes in the L3VPN network
  • N is the number of edge nodes in the L3VPN network
  • the present invention provides a method of establishing an LSP in a first aspect.
  • the method includes: a first operator edge router PE receives a notification message from a first evolved node base station eNodeB, where the notification message includes an IP address of a second eNodeB, where the first eNodeB and the second eNodeB belong to a neighboring base station;
  • the first PE searches the pre-established routing table according to the IP address of the second eNodeB, and obtains an entry whose destination IP address is the IP address of the second eNodeB and whose next hop is the second PE as the matching routing entry.
  • the first PE establishes a label switching path LSP with the second PE by using a label distribution protocol.
  • the present invention provides a carrier edge router PE in a second aspect.
  • the PE includes: a memory, configured to store a routing table, and a notification message receiving module, configured to receive a notification message from the first eNodeB, where the message includes an IP address of the second NodeB, where the first eNodeB and the second eNodeB belong to a neighboring base station; a searching module, configured to search a routing table according to the IP address of the second eNodeB, and obtain an entry whose destination IP address is the IP address of the second eNodeB and the next hop is another PE as a matching routing entry.
  • a connection establishment module is configured to establish an LSP with another PE through a label distribution protocol.
  • the present invention provides a network system in a third aspect.
  • the system includes the PE of the second aspect and the other PE.
  • an LSP connection is established between the two PEs. Otherwise, an LSP connection is not established between the PEs.
  • An LSP connection is established only between PEs connected to neighboring base stations, which avoids interworking between non-adjacent base stations, can meet security requirements, and can reduce the number of network connections and improve network scalability.
  • 1 is a schematic diagram of an existing 3G network
  • FIG. 2 is a schematic diagram of an existing LTE network
  • Figure 3 is an existing method of carrying by L3VPN technology
  • FIG. 4 is a schematic diagram of a network architecture according to an embodiment of the present invention.
  • Figure 5 illustrates the process by which the eNodeBl discovers the eNodeB2 using the ANR protocol
  • Figure 6 (a) and (b) are examples of VPN IPv4 routing tables
  • FIG. 7 is a block diagram showing the structure of a carrier edge router in accordance with an embodiment of the present invention. detailed description
  • FIG. 4 is a schematic diagram of a network architecture in accordance with one embodiment of the present invention.
  • the eNodeB is interconnected via PE and S-GW (Serving-Gateway)/ ⁇ E (Mobility Management Entity).
  • PE1, PE2, and PE3 are edge nodes respectively connected to the eNodeB l, eNodeB2, and eNodeB3 in the L3VPN network.
  • the IP subnet address of the link between the eNodeB1 and the PE1 is configured as, for example, 20. 1. 1. 0/24.
  • the IP subnet address of the link between the eNodeB2 and the PE2 is configured to be, for example, 20. 1. 2.
  • the IP subnet addresses of the link between the eNodeB 3 and the PE3 are respectively configured to be, for example, 20. 0/24.
  • the POP node is an edge node directly connected to the L3VPN network and the S-GW/MME through the link.
  • PEK PE2 and PE3 are only connected to the POP ( Label Switch Path), and no LSP connection is established between PEs.
  • an LSP connection is dynamically established as needed between PEs having a direct link connection relationship with a base station having an adjacent relationship. This will be explained below.
  • the MP-BGP protocol (Multi-Protocol Border Gateway Protocol) is run on each PE to facilitate the diffusion or routing of PEs.
  • the so-called diffusion means that the PE router distributes routing information to each PE router through MP-BGP sessions or using route reflection.
  • a BGP session is directly flooded between the PEs.
  • the PE only needs to establish a BGP session with the POP.
  • the MP-BGP protocol spreads the subnet IP address of each PE link to other PE nodes in the form of VPN IPv4 routes.
  • PE1 and PE2 are used to establish a VPN IPv4 routing table as shown in Figure 6 (a) and (b).
  • Each routing table includes several entries. Each routing entry includes ⁇ destination IP address, next hop ⁇ .
  • PE2 encapsulates the subnet IP address of the link to the eNodeB link to the MP-BGP route advertisement message.
  • the route advertisement message includes the destination IP address. The address is 20. 1. 2. 0/24, and the next hop is PE2.
  • PE1 After receiving the MP-BGP route advertisement message, PE1 establishes a route forwarding entry ⁇ 20. 1. 2. 0/24, PE2 ⁇ according to the destination IP address and the next hop information.
  • the eNodeB1 discovers its neighboring eNodeB2 through the ANR (Automatic Neighbour Relation) protocol, and sends the IP address information of the neighboring eNodeB2 to the PE1 by a notification message 20. 2. 2. 2/24. There are several ways to notify a message depending on the protocol.
  • PE1 searches the VPN IPv4 routing table in PE1 according to the IP address and matches the IP address of the eNodeB2 to the destination IP address and the next hop as the entry of PE2, that is, ⁇ 20. 1. 2. 0/24, PE2 ⁇ The entry is such that PE1 knows that eNodeB 2 and PE2 are directly connected through the link. PE1 determines that an LSP needs to be established with PE2 and triggers the LDP (Label Distribution Protocol) protocol to establish the LSP. Of course, LSPs can also be established through other label distribution protocols, such as the RSVP-TE protocol.
  • LDP Label Distribution Protocol
  • the destination IP address in the ⁇ 20. 1. 2. 0/24, PE2 ⁇ routing entry is the IP address of the eNodeB2. Further, the destination IP address may be the host IP address of the eNodeB2 or the subnet IP address of the link to which the eNodeB2 is connected.
  • PE1 determines the need to establish an LSP with PE2 based on the IP address of the neighboring base station e NodeB2 from the eNodeB1.
  • PE2 can determine that an LSP needs to be established with PE1 through a similar procedure, and triggers LDP to establish the LSP.
  • the first method is to manage the plan through the network. In the network specification stage, the network administrator determines whether the two base stations are adjacent according to the static plan. The advantage of this method is simplicity.
  • the second method is that the base station automatically discovers its neighboring base stations through a protocol, and the method can accurately determine neighbor base station information and reduce the complexity of network management.
  • 3GPP defines the ANR (Automatic Neighbour Relation) protocol for automatic discovery of neighboring base stations.
  • Figure 5 illustrates the process by which the eNodeBl discovers the eNodeB2 using the ANR protocol.
  • the eNodeB1 finds that it is an adjacent node with the eNodeB2 by interacting with a user equipment UE. Specifically, the UE detects all eNodeB devices that can be connected by wireless signals, i.e., eNodeB 1 and eNodeB 2 in the figure. The UE obtains the corresponding eNodeB identifier (eNodeB identifier) from the eNodeB 2, and then the UE sends the eNodeB ID to the eNodeB 1 as a notification message.
  • eNodeB identifier eNodeB identifier
  • step S2 the eNodeB1 obtains the IP address of the eNodeB2 through the MME as 20. 1. 2. 2/24.
  • step S3 the eNodeB1 notifies the PE1 of its own IP address (20. 1. 1. 2/24) and the IP address of the neighboring eNodeB2.
  • PE1 knows that it is connected to the eNodeB1 and the eNodeB2 with an IP address of 20. 1. 2. 2/24 Adjacent.
  • FIG. 7 is a structural diagram of a carrier edge router according to an embodiment of the present invention.
  • the operator edge router is used to implement the function of the PE1 in the foregoing method embodiment.
  • the operator edge router 700 is an edge node connected to the eNodeB1 by the virtual private network, and includes a memory 708, which stores a routing table, where the routing table includes the IP address of the eNodeB2 and the next hop.
  • PE2 is an edge node where the virtual private network and the eNodeB2 are connected through a link.
  • Provider edge router 700 further includes a notification message receiving module 702 receives the notification message from the eNodeBl, wherein the message includes the IP address of the e NodeB2, wherein the neighboring base station belonging eNodeBl and eNodeB2; searching module 704, in accordance with the message of IP eNodeB2 The address is found in the routing table, and the entry with the destination IP address being the IP address of the eN 0 deB2 and the next hop being the PE2 is used as the matching routing entry.
  • the connection establishing module 706 establishes the LSP connection with the PE2 through the label distribution protocol.
  • an LSP network connection is established between PE1 and PE2. Because there is no neighboring base station between PE1 and PE3, the LSP network connection is not established. Therefore, the security requirements are met, and the scalability of the network is improved.
  • the present invention has been described in detail in connection with the L3VPN network, the present invention is not limited thereto, and can be applied to other networks such as an L2VPN network or a similar virtual private network.
  • the routing protocol running on the PE is not limited to the MP-BGP protocol, and other similar routing protocols can be used.
  • the PE and the eNodeB1 can be connected directly through the physical link or through the Layer 2 network.

Abstract

La présente invention porte sur un procédé, un système et une station de base pour établir un chemin à commutation d'étiquettes (LSP). Un premier routeur côté fournisseur (PE) reçoit un message de notification en provenance d'un premier nœud évolué de station de base (eNodeB). Le message de notification comprend une adresse IP d'un second eNodeB. Le premier eNodeB et le second eNodeB sont des stations de base adjacentes. Le premier PE recherche une table de routage préétablie sur la base de l'adresse IP du second eNodeB. Le premier PE acquiert un élément de table de routage ayant l'adresse IP du second eNodeB comme adresse IP de destination et ayant un élément de table du second PE comme réponse pertinente pour un saut suivant. Le premier PE établit, par l'intermédiaire d'un protocole de distribution d'étiquettes, une connexion LSP au second PE. De ce fait, une connexion de réseau LSP est établie entre des PE ayant respectivement une relation de connexion de couche IP directe à la station de base adjacente.
PCT/CN2012/073484 2011-08-03 2012-04-01 Procédé, système et routeur s'appuyant sur un routage vpn pour établir un lsp WO2012149850A1 (fr)

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CN201110221347.5A CN102355402B (zh) 2011-08-03 2011-08-03 一种基于vpn路由建立lsp的方法、系统和路由器
CN201110221347.5 2011-08-03

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CN102281533B (zh) * 2011-08-03 2014-01-08 华为技术有限公司 基于rt建立lsp的方法、系统和路由器
CN102355402B (zh) * 2011-08-03 2014-05-07 华为技术有限公司 一种基于vpn路由建立lsp的方法、系统和路由器
WO2015000173A1 (fr) * 2013-07-05 2015-01-08 华为技术有限公司 Procédé d'établissement de tunnel, procédé d'attribution d'étiquette, dispositif, et système de réseau
CN103401787B (zh) * 2013-08-12 2017-02-22 北京华为数字技术有限公司 静态路由的下发方法及靠近用户侧的提供商的边缘设备
US20160192403A1 (en) * 2014-12-30 2016-06-30 Qualcomm Incorporated Mechanism to provide lte voice, internet and embms services over ethernet for connected home architecture
CN113098770B (zh) * 2020-01-08 2024-04-16 华为技术有限公司 报文发送方法、路由表项的生成方法、装置及存储介质

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