WO2008011818A1 - Procédé de fourniture d'un service réseau local privé virtuel à hiérarchie et système réseau - Google Patents

Procédé de fourniture d'un service réseau local privé virtuel à hiérarchie et système réseau Download PDF

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Publication number
WO2008011818A1
WO2008011818A1 PCT/CN2007/070200 CN2007070200W WO2008011818A1 WO 2008011818 A1 WO2008011818 A1 WO 2008011818A1 CN 2007070200 W CN2007070200 W CN 2007070200W WO 2008011818 A1 WO2008011818 A1 WO 2008011818A1
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Prior art keywords
virtual private
area network
router
autonomous system
network service
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PCT/CN2007/070200
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English (en)
Chinese (zh)
Inventor
Guoyi Chen
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Huawei Technologies Co., Ltd.
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Publication of WO2008011818A1 publication Critical patent/WO2008011818A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and network system for implementing a layered virtual private local area network service.
  • IP Internet Protocol
  • the MPLS L2VPN Multiple Protocol Label Switched L2 Virtual Private Network
  • QOS Quality of service
  • Virtual Private LAN Service is a point-to-multipoint application architecture of MPLS L2VPN. It borrows the idea of LAN (Local Area Network) and builds a virtual LAN service using IP/MPLS technology. Provides transparent Ethernet data transmission. From the user's point of view, the operator connects the network around itself like a large switch.
  • the VPLS technology solves the limitation of the traditional switch virtual local area network (VLAN) ID. For example: The switch can only provide 4096 VLAN IDs, and each user needs at least one VLAN ID. These restrictions are applicable to the network. Both scalability and large-scale deployments can cause problems, and the Signalling Transfer Point (STP) protocol needs to be run to prevent network loops and increase the burden on the network.
  • Figure 1 shows the typical network structure of VPLS.
  • Martini VPLS uses the Label Distribution Protocol (LDP) as the signaling for establishing the virtual link (PW, Pseudo Wire).
  • LDP Label Distribution Protocol
  • PW virtual link
  • Pseudo Wire virtual link
  • the automatic discovery mechanism is not defined. , need to be manually configured to complete the discovery of the service provider edge (PE, Provider Edge) router, so there is scalability problem;
  • Kompella VPLS uses Border Gateway Protocol (BGP) as the signaling to establish PW, automatic discovery mechanism Also done with BGP.
  • Border Gateway Protocol BGP
  • a method for implementing a layered virtual private LAN service in the prior art is a Martini VPLS Hierarchy-Virtual Private LAN Service (H-VPLS) scheme, as shown in FIG. 1: All PE routers 10 In a network plane, all PE routers 10 need to establish a full connection, and all user edge (CE, Customer Edge) routers 20 are also directly connected to the PE router 10; or as shown in FIG. 2, the PE router 10 in the backbone network The number is reduced. Some CE routers 20 are connected to the User-facing Provider Edge (UPE) router 12; with this improvement, the full connectivity and signaling overhead of the PE 10 in the backbone network is reduced a lot.
  • UEE User-facing Provider Edge
  • NPE Network core Provider Edge
  • the other NPE routers 11 and the local UPE routers 12 need to be concerned.
  • the UPE router 12 only the CEs directly connected to them are concerned.
  • Router 20 and NPE router 11. The forwarding plane of the VPLS is forwarded through the destination medium access control (MAC) address.
  • MAC medium access control
  • the PE router 10 in the flat network structure shown in FIG. 1 needs to complete forwarding to all CE routers 20 and other PE routers 10, in the network structure shown in FIG. It only needs to be forwarded to a small number of CE routers 20, UPE routers 12 and other NPE routers 11, so that the impact of the "first packet" on the NPE router 11 can be reduced.
  • Martini H-VPLS can only solve the problem of an autonomous system because it is based on LDP, Interior Gateway Protocol (IGP), and PWE3 (Pseudowire Emulation Edge to Edge). Cannot be deployed across autonomous systems; Because there is no automatic discovery mechanism, you need to manually configure it. This requires a lot of manual configuration, which is very unfavorable for maintenance management. Therefore, Martini H-VPLS is not suitable for operators to deploy VPLS on a large scale.
  • IGP Interior Gateway Protocol
  • PWE3 Pseudowire Emulation Edge to Edge
  • H-VPLS scheme of Kompella VPLS uses a route reflector to reduce a large number of PEs.
  • the router has a full mesh problem.
  • all PE routers and the route reflector establish an internal border gateway protocol (IBGP) connection by configuring a route reflector.
  • IBGP internal border gateway protocol
  • ORF outbound route filter
  • RTF Route Target Filter
  • the H-VPLS solution of Kompella VPLS only solves the problem of full mesh of a large number of PE routers, and can limit the distribution of unnecessary routing information. It does not solve the problem that each PE router maintains a large number of PWs and "first packet".
  • the problem of replication that is, each PE router needs to maintain almost all PWs, and the "first packet" needs to be copied to all local CE router interfaces and PW interfaces.
  • the packets broadcasted by the entire network in an AS need to pass through each PW belonging to the VPLS instance.
  • Other ASs send, these PWs may all be mapped to the same physical link, so there are a large number of "repetitive messages, transmitted between ASs, occupying a lot of inter-domain path bandwidth, that is, the communication autonomous system There will be multiple virtual links between them, causing "repetitive messages" to be sent multiple times between autonomous systems.
  • the embodiments of the present invention provide a method and a network system for implementing a layered virtual private local area network service, which can reduce resource waste and improve bandwidth utilization in the file forwarding process.
  • Embodiments of the present invention provide a method for implementing a layered virtual private local area network service, including the steps of: dividing a virtual private local area network service network according to an autonomous system; establishing a network connection between service provider edge routers in each autonomous system, and for each Virtual private LAN service instances establish virtual links between service provider edge routers; between each autonomous system that communicates with each virtual private office The domain network service instance establishes a virtual link; the user edge router uses the established virtual link for communication.
  • the embodiment of the invention provides a network system for implementing a hierarchical virtual private local area network service, where the virtual private local area network service network is divided according to an autonomous system, including:
  • a service provider edge router configured to establish a network connection within each autonomous system, and establish a virtual link for each virtual private local area network service instance
  • An autonomous system border router for establishing a virtual link for each virtual private area network service instance between autonomous systems that communicate;
  • User edge router used to communicate with the established virtual link.
  • the embodiment of the present invention reduces the virtual link by establishing only a virtual link between the service provider edge routers in the autonomous system and establishing only one virtual link between the autonomous systems for each virtual private local area network service instance.
  • FIG. 1 is a typical network structure diagram of a prior art VPLS
  • FIG. 2 is a schematic diagram of a prior art network structure
  • FIG. 3 is a network structure diagram of an embodiment of the present invention.
  • Figure 4 is a flow chart of the first embodiment of the present invention.
  • Figure 5 is a flow chart of a second embodiment of the present invention.
  • Figure 6 is a flow chart of a third embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of an ASBR in a network system structure according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a PE router in a network system structure according to an embodiment of the present invention.
  • the embodiments of the present invention provide a method for implementing a layered virtual private local area network service, which is used to reduce resource waste and improve bandwidth utilization in a message forwarding process.
  • the embodiment of the present invention can implement H-VPLS by using BGP extension.
  • VPLS delivers data traffic between sites in each VPN by establishing a fully-connected PW between PE routers on the IP/MPLS backbone network.
  • the ingress PE Ingress
  • the router receives the data packet and queries the Forwarding Data Base (FDB) table according to the destination MAC address of the packet. If the corresponding entry is found, the data packet is forwarded to the corresponding outgoing interface PE according to the entry.
  • Egress PE Egress PE
  • the Egress PE router receives the data packet sent from the PW, and the corresponding VPLS instance.
  • the corresponding interface is forwarded to the corresponding interface. If the corresponding interface is not found, the VPLS instance is broadcast to all non-PW interfaces and the source MAC address is learned. After receiving the packet, the CE router forwards the packet forwarding process according to the forwarding process described above, and learns the source MAC address. After learning the MAC address, the subsequent data traffic is learned. The MAC address is forwarded as if it were a large switch. At the same time, the VPLS also provides the MAC address aging function. If a MAC address entry is not accessed within a certain period of time, the MAC address entry will be deleted.
  • FIG. 3 it is a structural diagram of a network system for implementing a layered virtual private local area network service according to an embodiment of the present invention.
  • the VPLS network is divided into the first AS 31, the second AS 32, and the third AS 33 according to the AS (Autonomous System); the PE router is classified into an NPE router or a UPE router, an NPE router, or a UPE according to the network level of the AS.
  • the router establishes a network connection in each autonomous system and establishes a virtual link for each VPLS instance.
  • An autonomous system border router (ASBR) is used for each virtual private local area network between the autonomous systems that perform communication.
  • the service instance establishes a virtual link; the CE router uses the established virtual link for communication.
  • ASBR autonomous system border router
  • the first AS 31 is a first-level network
  • the second AS 32 and the third AS 33 are second-level networks.
  • the first ASBR 301 is an ASBR connected to the first AS 31 in the second AS 32.
  • the second ASBR 302 is the ASBR connected to the second AS 32 in the first AS 31; likewise, the third ASBR 303 is the ASBR connected to the third AS 32 in the first AS 31, and the fourth ASBR 304 is the third AS 33 The ASBR connected to the first AS 31.
  • VPN 1 and VPN 2 there are two VPNs, VPN 1 and VPN 2, and their sites are distributed among the above three ASs, among which the first CE router 201, the third CE router 203, the fourth CE router 204, the fifth CE router 205, and the seventh CE Router 207, ninth CE router 209, eleventh CE router 211 belong to VPN1, wherein second CE router 202, sixth CE router 206, eighth CE router 208, tenth CE router 210, twelfth CE router 212, The thirteenth CE router 213 belongs to VPN 2.
  • the first embodiment of the present invention includes the following steps:
  • the VPLS network is divided into autonomous systems.
  • a network connection is established between PE routers in each autonomous system.
  • a virtual link between the PE routers is established for each VPLS instance in the autonomous system, and a virtual link is established for each VPLS instance between the autonomous systems that communicate with each other.
  • the CE router uses the established virtual link for communication.
  • a second embodiment of the present invention includes the following steps:
  • the VPLS network is divided into ASs.
  • a network connection is established between PE routers in each autonomous system.
  • This step more specifically includes:
  • the first ASBR creates network layer reachability information.
  • the second ASBR creates network layer reachability information.
  • the first ASBR allocates a label block according to the created network layer reachability information.
  • the second ASBR allocates a label block according to the created network layer reachability information.
  • the first ASBR sends the network layer reachability information and the label block to the second ASBR.
  • the second ASBR sends the network layer reachability information and the label block to the first ASBR. P4) selecting a label block;
  • the second ASBR selects the corresponding label block as the multi-association of sending data to the first ASBR.
  • the first ASBR selects a corresponding label block as a multi-protocol label switching label that sends data to the second ASBR.
  • the first ASBR receives the routing information sent by the second ASBR, and the second ASBR receives the routing information sent by the first ASBR.
  • the BGP community attribute NO—ADVERTISE is set, so that the received route is no longer sent to any other neighbors.
  • the CE router uses the established virtual link for communication.
  • the second embodiment of the present invention provides an implementation step of establishing only one virtual link for each VPLS instance in the autonomous system.
  • the third embodiment of the present invention includes the following steps:
  • the VPLS network is divided into autonomous systems.
  • a network connection is established between PE routers in each autonomous system.
  • a virtual link between PE routers is established for each VPLS instance in the AS.
  • the network layer reachability information and the label block are sent to the second ASBR.
  • the second ASBR selects a corresponding label block as a multi-protocol label switching label for transmitting data to the first ASBR.
  • the ASBR receives routing information. S9) setting a community attribute;
  • the BGP community attribute NO—ADVERTISE is set, so that the received route is no longer sent to any other neighbors.
  • the UPE router finds the VPLS instance to which it belongs based on the interface connected to the CE router.
  • the FDB table is queried according to the VPLS instance.
  • step S14 determining whether the entry exists in the table, and if yes, proceeding to step S14), if not, proceeding to step S15);
  • the message is broadcast to all interfaces in the instance.
  • the interface that correctly receives the packet is called the correct receiver.
  • the address learning includes receiving feedback from the correct recipient; recording the communication path with the correct recipient and storing it in the FDB table.
  • the FDB table In order to ensure that the FDB table is not too large, it needs to be cleaned up, that is, some entries that have not been used for a long time can be set.
  • the threshold time can be set before the system is run.
  • the FDB table is searched. If the entry is not used, the entry is aged. It can be understood that the retrieval of the FDB table does not necessarily need to be performed after the address learning is completed, or at other times.
  • the third embodiment of the present invention mainly increases the address learning and the steps of aging the entries that are not used for a long period of time compared with the first embodiment and the second embodiment.
  • the ASBR includes at least a receiving unit 71 and a setting unit 72, and may further include an information generating unit 73, a sending unit 74, a selecting unit 75, and Packaging unit 76; wherein:
  • the information generating unit 73 creates network layer reachability information (NLRI) according to the VPLS service instance and divides the packet into the west;
  • NLRI network layer reachability information
  • the message encapsulating unit 76 adds the allocated label to the packet and encapsulates it into a multi-protocol label exchange message;
  • the sending unit 74 sends the NLRI and the label block to the ASBR that communicates with it;
  • Receiving unit 71 receives routing information sent by the ASBR with which it communicates;
  • the setting unit 72 sets the community attribute of the edge gateway protocol
  • the selecting unit 75 selects a corresponding tag from the tag blocks in the routing information according to its own identifier as a multi-protocol label switching tag that transmits data to the ASBR with which it communicates.
  • the PE router includes a first searching unit 81, a second searching unit 82, a forwarding unit 83, and an address learning unit 84, where:
  • the first searching unit 81 queries the VPLS service instance to which the NPE router belongs.
  • the second searching unit 82 performs forwarding of the database table lookup in the instance according to the address carried in the packet;
  • the message forwarding unit 83 is configured to: when the second search unit finds the corresponding entry, forward the packet to the interface specified by the entry; when the second search unit does not find the corresponding entry, it will report The text is broadcast to all interfaces in the instance;
  • the address learning unit 84 is configured to perform address learning when the second search unit does not find the corresponding entry.
  • the address learning unit 84 includes at least a receiving subunit and a recording subunit, and may further include a processing subunit, and a preset subunit.
  • the receiving subunit receives the feedback information of the correct receiving party;
  • the subunit records the communication path with the correct receiver and stores it in the forwarding database table.
  • the preset subunit sets the aging threshold time.
  • the processing subunit aging the forwarding database entries that are not used after the aging threshold time.
  • the first ASBR 301 has a VPLS instance of the autonomous system.
  • the first ASBR 301 has VPLS 1 and VPLS 2.
  • the first ASBR 301 creates two NLRIs according to the two VPLSs, and allocates two different ACLs.
  • the label block, the next hop is the first ASBR 301, and then the two NLRIs are sent to the second ASBR 302.
  • the second ASBR 302 is based on its own VPLS edge device identifier (VE ID, The Vpls Edge Device Identifier selects an appropriate label from the label block as the MPLS label for the second ASBR 302 to send data to the first ASBR 301.
  • VE ID The Vpls Edge Device Identifier
  • the second ASBR 302 also creates two NLRIs, and respectively allocates one label block.
  • the next hop is the second ASBR 302, and then the two NLRIs are sent to the first ASBR 301.
  • the first ASBR 301 After receiving the two NLRIs, the first ASBR 301 also selects the appropriate label according to its own VE ID as the second.
  • the ASBR 302 sends the MPLS label of the data; the same is true for the label distribution process between the third ASBR 303 and the fourth ASBR 304; after receiving these routes, these ASBRs cannot be sent to any other neighbors (through the BGP community). NO- ADVERTISE property can be easily done), so that between the ASBR, for each VPLS instance, only one virtual link.
  • the communication between the CE routers using the established virtual link can be as follows:
  • the first CE router 201 encapsulates the MAC address of the second CE router 202 on the packet to be sent to the second CE router 202 as the destination MAC address, and sends it to the second UPE router 122, the second UPE router.
  • the VPLS instance is found according to the interface connected to the first CE router 201.
  • VPLS 1 searches for the FDB table in the VPLS instance according to the destination MAC address. If the related entry is found, the data is forwarded according to the entry.
  • the packets sent by the PW are tagged with two layers. The inner layer is the private network label and the outer layer is the tunnel label.
  • the source MAC address is learned at the same time.
  • the first ASBR 301 After the data packet arrives at the first ASBR 301, the first ASBR 301 first determines which VPLS instance the data belongs to according to the inner label of the data packet, that is, which VPN; and then performs the destination MAC address lookup in the FDB table of the associated VPLS. If the related entry is found, the data is forwarded to the outbound interface of the entry. Similarly, if it is the first packet, there is usually no related FDB entry, so the data needs to be sent to the VPLS 1 instance. In the case of the first scenario, the second CE router 202 is directly connected to the first ASBR 301. Therefore, when the first ASBR 301 broadcasts to the local interface, the first ASBR 301 is broadcasted to the local interface. The data packet is sent to the second CE router 202;
  • the second CE router 202 After receiving the data packet, the second CE router 202 sends a response packet to the first CE router 201, and the response packet uses the MAC address of the first CE router 201 as the destination MAC address, and sends the data packet to the first ASBR 301;
  • the first ASBR 301 determines the VPLS according to the interface connected to the second CE router 202, and then performs the destination MAC address lookup in the FDB table in the VPLS 1. Since the first ASBR 301 has already performed MAC learning, it should be The FDB entry can be found.
  • the outbound interface corresponding to the entry is the virtual link interface of the first ASBR 301 to the second UPE router 122. At this time, the first ASBR 301 is allocated to the first ASBR by the second UPE router 122.
  • the label of the 301 is used as the inner label of the label stack, and then the tunnel label between the first ASBR 301 and the second UPE router 122 is encapsulated into an MPLS packet and sent to the second UPE router 122 to learn the source MAC address.
  • the second UPE router 122 finds the corresponding VPLS instance according to the inner label: VPLS 1, in the FDB of VPLS 1.
  • the destination MAC address is searched. Since the second UPE router 122 has learned the source MAC address, the corresponding FDB entry should be found.
  • the outbound interface corresponding to the entry is the interface connected to the first CE router 201.
  • the MAC learning is also performed; thus, the bidirectional path between the first CE router 201 and the second CE router 202 is opened, and the first CE router 201 and the second CE router 202 are connected. Data is forwarded on the same switch as the two interfaces in the same VLAN.
  • the communication process is as follows: 1. Referring to FIG. 3, the first packet sent by the first CE router 201 to the third CE router 203 also needs to undergo the communication process in the first case, and the first ASBR 301 is in the second ASBR 302. Before the packet is sent, the label allocated to the first ASBR 301 by the second ASBR 302 in the VPLS 1 is encapsulated into an MPLS packet and then sent to the second ASBR 302. The second ASBR 302 determines the VPLS to which the label belongs. It is VPLS 1; the second ASBR 302 performs MAC address lookup in the FDB table of VPLS 1.
  • the data is forwarded to the corresponding interface; likewise, if it is the first packet, there is usually no related table.
  • the second ASBR 302 broadcasts the data packet to all the local interfaces and the PW interface in the VPLS 1, and performs source MAC address learning at the same time;
  • the third CE router 203 Since the third CE router 203 is connected to the second ASBR 302, after receiving the data packet, the third CE router 203 performs a data packet response, and the responding data packet uses the MAC address of the first CE router 201 as the destination MAC.
  • the second ASBR 302 determines the VPLS to which it belongs according to the interface connected to the third CE router 203, here is VPLS 1; the second ASBR 302 performs MAC address lookup in VPLS 1, due to The second ASBR 302 has previously learned the source MAC address.
  • the second ASBR 302 can find the corresponding entry, and the outbound interface corresponds to the PW of the second ASBR 302 to the first ASBR 301 according to the found entry.
  • the first ASBR 301 is encapsulated with the label allocated by the first ASBR 301 for the second ASBR 302, and then sent to the first ASBR 301.
  • the first ASBR 301 determines the VPLS to which the VPLS belongs according to the label: VPLS 1, An ASBR 301 continues to perform MAC address lookup in VPLS 1.
  • the outbound interface corresponding to the entry is the PW between the first ASBR 301 and the second UPE router 122, and subsequent The forwarding operation is the same as the communication process in the first case described above; thus the first CE router 201 and the second CE router 203 can perform normal communication.
  • the second ASBR 302 broadcasts in the VPLS 1 of the first AS 31, and the first packet is The packet encapsulates the two-layer label and sends it to the third ASBR 303.
  • the third ASBR 303 first determines the VPLS to which it belongs according to the inner label: VPLS 1, and then performs FDB table lookup; if no related entry is found, the third ASBR 303 All local interfaces of VPLS 1 and other autonomy
  • the PW interface between the ASBRs directly connected to the system broadcasts the source MAC address learning.
  • the data is encapsulated on the label of the fourth ASBR 304 for the VPLS 1 to the third ASBR 303, and sent to the fourth ASBR 304.
  • the fourth ASBR The subsequent operations of the 304 are the same as the second ASBR 302 received by the first ASBR 301 in the first case communication process; the final message arrives at the fifth CE router 205, and the PE router and the ASBR along the way source.
  • the MAC address is learned such that the data path between the first CE router 201 and the fifth CE router 205 is formed.
  • the embodiment of the present invention reduces the virtual link by establishing only a virtual link between the service provider edge routers in the autonomous system and establishing only one virtual link between the autonomous systems for each virtual private local area network service instance.
  • the community attribute of the edge gateway protocol is set to prevent the received routing information from being forwarded to other neighbors to reduce the waste of resources.
  • the address learning function can be used to record the forwarding path information of the unknown address. In the process of forwarding the packet, only the first packet packet needs to be broadcasted, and then the packet can be directly forwarded according to the entry, thereby reducing Repeated packet transmission improves the efficiency of packet forwarding.

Abstract

L'invention concerne un procédé de fourniture d'un service réseau local privé virtuel à hiérarchie et un système réseau permettant de réduire le gaspillage des ressources au cours de l'acheminement de messages et d'améliorer l'utilisation de la bande passante. Selon le procédé de fourniture d'un service réseau local privé à hiérarchie, le réseau de services réseau local privé virtuel est divisé en fonction du système autonome; à l'intérieur des routeurs de bordure de fournisseur de service parmi les systèmes autonomes, des connexions réseau sont établies; pour chaque cas du service réseau local privé virtuel, les pseudo-câbles parmi les routeurs de bordure de fournisseur de service sont établis; pour chaque cas du service réseau local privé virtuel, un pseudo-câble est établi parmi les systèmes autonomes communicants et les routeurs de bordure de client utilisent les pseudo-câbles établis pour communiquer les uns avec les autres, ce qui permet d'améliorer efficacement le rendement de distribution des chemins.
PCT/CN2007/070200 2006-07-14 2007-06-28 Procédé de fourniture d'un service réseau local privé virtuel à hiérarchie et système réseau WO2008011818A1 (fr)

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