CN101110745A - Method, device and system for engaging second layer network and third layer network - Google Patents
Method, device and system for engaging second layer network and third layer network Download PDFInfo
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- CN101110745A CN101110745A CNA2007100765164A CN200710076516A CN101110745A CN 101110745 A CN101110745 A CN 101110745A CN A2007100765164 A CNA2007100765164 A CN A2007100765164A CN 200710076516 A CN200710076516 A CN 200710076516A CN 101110745 A CN101110745 A CN 101110745A
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Abstract
The present invention discloses a method, a device and a system for connecting a two-layer network and a three-layer network, which solves the problems that when the two-layer network and the three-layer network are connected, the networking cost is high, and the network structure is complex. A two-layer virtual interface or a three-layer virtual interface receives a data message, and finds out a corresponding three-layer virtual interface or two-layer virtual interface in a binding mapping table of the two-layer or three-layer virtual interface, according to a two-layer virtual interface identifier or a three-layer virtual interface identifier, the three-layer virtual interface or the two-layer virtual interface transmits the data message sent by the two-layer virtual interface or the three-layer virtual interface. The present invention realizes the communication of the data message between the two-layer network and the three-layer network by using only one terminal access device on the two-layer network and the three-layer network, compared with the prior art, one network device is saved, the networking cost is reduced, and the flexibility and the reliability of the networking are improved. The present invention can be applied in the connection between an MPLS L2VPN network and an MPLS L3VPN network.
Description
Technical field
The present invention relates to the methods, devices and systems of the network interconnection, particularly a kind of methods, devices and systems of realizing MPLS L2VPN (multiprotocol label switching double-layer virtual private network) network and MPLS L3VPN (multi-protocol label switching three-layer Virtual Private Network) network interconnection.
Background technology
Along with development of internet technology, for adapting to the demand of different user, different business amount, various networking technologys emerge in an endless stream.Current MPLS L2VPN network that generally uses and the communication process between the MPLS L3VPN network, as shown in Figure 1.The communication process of data message between MPLS L2VPN network and MPLS L3VPN network that sends with CE1 (Customer Edge, customer edge) equipment is that example describes below:
With reference to accompanying drawing 1, data message is sent to CE2 from CE1 need pass MPLS L2VPN network and MPLSL3VPN network, and data message transmits through three processes: 1, the transmission course of data message in MPLS L2VPN network; 2, the transmission course of data message between MPLS L2VPN network and MPLS L3VPN network; 3, the transmission course of data message in MPLS L3VPN network.
1, the transmission course of data message in MPLS L2VPN network.CE1 equipment is preserved user's routing table, and CE1 equipment has the function of safeguarding this routing table.(PDU shown in Fig. 1) is preceding for CE1 equipment sending data message, has known the destination address (address of CE2) of data message, and destination address and source address (address of CE1) is encapsulated in the heading of data message.PE1 (Provider Edge in CE1 equipment and the MPLS L2VPN network, provider edge equipment) directly links to each other, CE1 equipment sends to data message on the PE1 equipment, described PE1 equipment is according to destination address in the data message and source address information, search two layers of FIB (Forwarding Information Table, the forwarding information table) list item, the termination equipment PE2 that finds data message to transmit in the MPLSL2VPN network, the PE1 equipment that PE1 equipment basis finds in two layers of fib table item is data message encapsulate inner layer label (N2 is a vpn label) and outer layer label (W2 is an outer layer label) to the routing iinformation of termination equipment PE2.Data message passes through P (Provider according to outer layer label in MPLS L2VPN network, the backbone network core router) equipment exchanges, form the PW (pseudo-line) of a PE1 equipment to termination equipment PE2, the strip label switching path of the termination equipment PE2 of this PW indication from source PE1 equipment to MPLS L2VPN network, data message utilizes outer layer label, arrive termination equipment PE2 along label switched path, after described termination equipment PE2 receives data message, search ILM (Incoming Label Map according to the outer layer label of data message, go into the label mapping table) list item, find the information of jumping out, peel off outer layer label, continue to search the ILM list item according to vpn label, find the information of jumping out, peel off vpn label.Can find two layers of terminated flag after two-layer label is all peelled off, the termination equipment PE2 of MPLS L2VPN network ejects data message from MPLS L2VPN network.
2, the transmission course of data message between MPLS L2VPN network and MPLS L3VPN network.Directly be connected by a physical circuit between the termination equipment PE2 of MPLSL2VPN network and the access device PE3 of MPLS L3VPN network.The termination equipment PE2 of MPLS L2VPN network ejects data message from MPLS L2VPN network after, data message is sent straight on the access device PE3 of MPLS L3VPN network.
3, the transmission course of data message in MPLS L3VPN network.The access device PE3 of MPLS L3VPN network is according to destination address in the data message and source address information, search three layers of fib table item, find in the MPLSL3VPN network with data message in the PE4 equipment that directly links to each other of destination address (CE2 address), PE3 equipment is data message encapsulate inner layer label (N3 is a vpn label) and outer layer label (W3 is an outer layer label) according to the PE3 equipment that finds in three layers of fib table item to the routing iinformation of PE4 equipment.Data message transmits in MPLS L3VPN network according to outer layer label.After PE3 equipment sent to PE4 equipment with data message, PE4 equipment was peelled off the two-layer label of data message, takes out destination address from heading, searches the data message forwarding path in the fib table item, gave CE2 equipment with data message forwarding.
In MPLS L2VPN network, if that insert is BRAS (Broadband Remote Access Server) user, then only need change the access device PE3 in the MPLS L3VPN network into BRAS equipment, carrying out the authentication management according to user profile except needs on the BRAS equipment, other steps and access device are that the situation of CE1 is identical, can realize interconnected between MPLS L2VPN network and the MPLS L3VPN network.
Above-mentioned realization double layer network and the interconnected method of three-layer network, be between MPLS L2VPN network and MPLSL3VPN network, to be connected by two provider edge equipments of PE2 and PE3, thereby reach the purpose that MPLS L2VPN network and MPLS L3VPN network are connected, problems such as networking cost height, networking flexibility and poor reliability when adopting the method for this linking network can cause double layer network and three-layer network to be connected.
Summary of the invention
On the one hand, embodiments of the invention provide a kind of means of communication that are connected double layer network and three-layer network, and these means of communication normally exchange data message between double layer network and three-layer network probability improves.
The technical scheme that embodiments of the invention adopt comprises:
A kind of means of communication that are connected double layer network and three-layer network comprise the steps:
Two-layer virtual interface or L 3 virtual interface are received data message;
According to two-layer virtual interface identifier in the data message or L 3 virtual interface identifier, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface or two-layer virtual interface;
L 3 virtual interface or two-layer virtual interface are transmitted the data message of two-layer virtual interface or the transmission of L 3 virtual interface.
The means of communication that the embodiment of the invention provides, between double layer network and three-layer network, use a termination access device, carry out the exchange of data message between double layer network and three-layer network, reduced the fault point of communication between net with respect to prior art, improved the flexibility of networking, simplify the process of data message communication between net, thereby improved the reliability of communication between net.
On the other hand, embodiments of the invention provide a kind of communication device that is connected double layer network and three-layer network, make the connected structure of double layer network and three-layer network simple, data message improves by the probability that this communication device normally exchanges between double layer network and three-layer network.
The technical scheme that embodiments of the invention adopt comprises:
A kind of communication device that is connected double layer network and three-layer network comprises at least one two-layer virtual interface, is used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table, and described communication device also comprises:
Search the unit, when described two-layer virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface, described data message is sent to described L 3 virtual interface;
When described L 3 virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding two-layer virtual interface, described data message is sent to described two-layer virtual interface.
The communication device that the embodiment of the invention provides, between double layer network and three-layer network, use a termination access device, carry out the exchange of data message between double layer network and three-layer network, reduced the fault point of communication between net with respect to prior art, improve the flexibility of networking, simplified the process of data message communication between net, thereby improved the reliability of communication between net, and saved a network equipment, saved hardware cost.
Again on the one hand, embodiments of the invention provide a kind of system that is connected double layer network and three-layer network, this system makes the connected structure of double layer network and three-layer network simple, has saved hardware cost, and has improved the probability that data message normally exchanges between double layer network and three-layer network.
The technical scheme that embodiments of the invention adopt comprises:
A kind of system that is connected double layer network and three-layer network comprises a termination access device, is arranged between double layer network and the three-layer network, and described termination access device comprises: at least one two-layer virtual interface is used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Be added with sign on the described two-layer virtual interface, be added with on the described L 3 virtual interface and the identical sign of described two-layer virtual interface; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table; Described L 3 virtual interface configuration has Media Access Control address.
The system that the embodiment of the invention provides, only need between double layer network and three-layer network, use a termination access device, just can realize the interconnected of double layer network and three-layer network, this termination access device both can be used as the termination equipment of double layer network, can be used as the access device of three-layer network again, saved a network equipment with respect to prior art, thereby reduced networking cost, and improved the flexibility of networking, and just can realize the communication of double layer network and three-layer network owing to only need use a termination access device, reduced the fault point of communication between net with respect to prior art, simplify the process of data message communication between net, thereby improved the reliability of communication between net; Simultaneously, can carry out effective stratification QOS (service quality) scheduling to the user data message.
Description of drawings
Fig. 1 is the bridging mode schematic diagram of MPLS L2VPN network and MPLS L3VPN network in the prior art;
Fig. 2 is the communication device schematic diagram of embodiments of the invention;
Fig. 3 is connected the schematic diagram of MPLS L2VPN network and MPLSL3VPN network by a termination access device for embodiments of the invention;
Fig. 4 is the enlarged diagram of termination access device shown in Figure 3;
Fig. 5 is the schematic diagram that the three layers of IP public network at MPLS L2VPN network and L2TP Tunnel place is connected communication.
Embodiment
Prior art links to each other the termination equipment of double layer network and the access device of three-layer network by a physical circuit, and to reach the purpose that is connected double layer network and three-layer network, for reaching this purpose, the technical scheme that embodiments of the invention adopt is:
A kind of means of communication that are connected double layer network and three-layer network comprise the steps:
Two-layer virtual interface or L 3 virtual interface are received data message;
According to two-layer virtual interface identifier in the data message or L 3 virtual interface identifier, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface or two-layer virtual interface;
L 3 virtual interface or two-layer virtual interface are transmitted the data message of two-layer virtual interface or the transmission of L 3 virtual interface.
Corresponding with these means of communication, embodiments of the invention also provide a kind of communication device that is connected double layer network and three-layer network, and as shown in Figure 2, this communication device comprises at least one two-layer virtual interface, are used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table, and described communication device also comprises:
Search the unit, when described two-layer virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface, described data message is sent to described L 3 virtual interface;
When described L 3 virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding two-layer virtual interface, described data message is sent to described two-layer virtual interface.
The embodiment of the invention is used a termination access device between double layer network and three-layer network, carry out the exchange of data message between double layer network and three-layer network, reduced the fault point of communication between net with respect to prior art, improved the flexibility of networking, simplified the process of data message communication between net, thereby improved the reliability of communication between net, and saved a network equipment, saved hardware cost.
For the purpose, scheme and the effect that make the embodiment of the invention is clearer, be described in detail below in conjunction with the execution mode of accompanying drawing to the present invention program:
In the present embodiment, double layer network is a MPLS L2VPN network, and three-layer network is a MPLS L3VPN network.Be that example describes with the communication between MPLS L2VPN network and the MPLS L3VPN network below.
As shown in Figure 3, between MPLS L2VPN network and MPLS L3VPN network, set up a termination access device, on described termination access device, set up two virtual interfaces, one of them virtual interface is the two-layer virtual interface, described two-layer virtual interface is connected with the PE1 equipment of MPLS L2VPN network opposite end by PW (pseudo-line), another virtual interface is the L 3 virtual interface, and described L 3 virtual interface is connected with the PE2 equipment of MPLS L3VPN network opposite end.The termination access device of setting up between described MPLS L2VPN network and the MPLS L3VPN network has served as the termination equipment PE2 of MPLS L2VPN network shown in Figure 1 and the access device PE3 of MPLSL3VPN network simultaneously.Described termination access device can make data message communication between double layer network and three-layer network normally, and, saved a PE equipment with respect to prior art.
As shown in Figure 4, two virtual interface types of described termination access device are VE (VirtualEthernet, virtual ether interface).This ve interface is the interface of broadcast type, and can carry out ARP (address resolution protocol) study.In actual communication, this ve interface is mapped to the corresponding physical interface, realizes receiving and sending datagram by physical interface, and described virtual interface is realized the control action to reception of data message and transmission.
A virtual interface is the interface of MPLS L2VPN network, represents with VE1; Another virtual interface is the interface of MPLS L3VPN network, represents with VE2.The VE1 interface does not have sub-interface, and described VE1 interface can directly insert ce router, can directly insert BRAS user yet; The VE2 interface can comprise a plurality of sub-interfaces, and the sub-interface of described VE2 interface can be divided into ce router access interface and BRAS user's access interface according to inserting the user type difference.
Two virtual interface VE1 and VE2 partner, and have corresponding sign.Be VE1 interface configuration sign, be VE2 interface configuration and the corresponding sign of VE1 interface, two virtual interface VE1 and VE2 can be associated according to sign, store the described sign that is used for related VE1 and VE2 interface into two L 3 virtual interfaces binding mapping table.When the VE2 interface comprises a plurality of sub-interface, be each sub-interface configuration and the corresponding sign of VE1 interface identifier, for example: VE2 comprises 4 sub-interfaces, VE1 is designated 5, for the sign of each sub-interface configuration of VE2 also is 5; There is corresponding relation between VE1 and each sub-interface.
In order to be connected a plurality of three-layer networks by a double layer network, a termination access device is set at this double layer network edge, on this termination access device, set up at least one pair of virtual interface, carry out association by sign between every pair of virtual interface, each is not corresponding to the sign between the virtual interface, a virtual interface connects double layer network in every pair of virtual interface, and another virtual interface connects three-layer network.Each virtual interface that connects three-layer network can comprise more than one sub-interface.For each sub-interface disposes corresponding sign, in every pair of virtual interface, there is corresponding relation between the sub-interface of the virtual interface of each connection double layer network and each connection three-layer network.Follow the prescribed rules, also can be connected a plurality of double layer networks by a three-layer network.
Present embodiment carries out network by the method that makes up virtual interface on a termination access device and is connected, and can reach the reduction networking cost, improves the flexibility of networking and the purpose of reliability.
In MPLS L2VPN network, the VE1 interface of termination access device can directly link to each other with the access user, also can link to each other with the access user by far-end PE equipment.Described access user can insert the user for CE, also can insert the user for BRAS.
In MPLS L2VPN network, because not responsible preservation of PE equipment and maintaining routing list, so when the access user directly links to each other with the termination access device, do not need to be VE1 interface configuration MAC (Media Access Control address) address and Routing Protocol; When inserting the PE equipment of user and link to each other, just need be VE1 interface configuration virtual mac address and Routing Protocol with the termination access device by far-end.
In MPLS L2VPN network, far-end PE equipment is connected by PW (pseudo-line) between the access device with termination.VE1 Interface status (On/Off) depends on the PW state (On/Off) at its place, and in the time of PW state up (unlatching), this VE1 Interface status is opened; When the VE1 Interface status was opened, the VE1 interface was issued to the sign of this interface configuration in the two L 3 virtual interfaces binding mapping table, and the terminated flag of MPLSL2VPN network is issued in ILM (Incoming Label Map the goes into the label mapping table) list item.
In MPLS L3VPN network, the VE2 interface can directly link to each other with the access user, also can link to each other with the access user by far-end PE equipment.Described access user can insert the user for CE, also can insert the user for BRAS.
In MPLS L3VPN network,, then need to be this VE2 interface configuration Routing Protocol if that the access of described VE2 interface is CE user; If that described VE2 interface inserts is BRAS user, then this VE2 interface will dispose BRAS user's access and authentication mode.In order to realize multicast functionality, can dispose multicast protocol for ce router or BRAS personal user.
By between the access interface on VE2 interface and the ce router, enabling multicast routing protocol, and multicast source is arranged in the up three layers of IP public network, just can realizes flux of multicast is copied to the VE2 interface, thereby realize transmitting the ability of multicast packet.The concrete steps of described transmission multicast packet are: (source MAC is the MAC of VE2 interface at first to carry out two layers of information encapsulation of user multicast message, purpose MAC is the multicast MAC with multicast IP correspondence), then carry out the two-layer label encapsulation of multicast message, and packaged multicast message is sent; Carry out two layers of information encapsulation of outer layer tunnel again, this handles the same with top clean culture; If the three layers of IP public network binding that links to each other at CE equipment has multicast source, the multicast packet that the access device that then terminates receives need flick off two-layer label, do RPF (inverse path forwarding) inspection of multicast again according to the VE2 interface, then carry out common flux of multicast replication processes.CE equipment can be used as the multicast router of three layers of IP public network or certain MPLS L3VPN network example, and MVPN (Mobile Virtual Private Network) can adopt Multicast Domain (multicast domain), VPN-IP PIM (Protocol Independent Multicast between Virtual Private Network and the IP network), MD usingPIM NBMA techniques any technology such as (multicast domains of the non-broadcasting multipath of use agreement independent multicast network technology) to make up.
In MPLS L3VPN network, because PE equipment is responsible for preserving also maintaining routing list, so need be to VE2 interface configuration Routing Protocol and virtual mac address.Therefore, the VE2 Interface status not only depends on PW state (On/Off), also depends on the protocol status (On/Off) of VE2 interface.
In the time of PW state up (unlatching), the physical state of this VE2 interface is opened; The protocol status of VE2 interface depend on this interface whether configuration of IP address, this interface whether open, the PW state of this interface correspondence up whether.Has only when the VE2 interface configuration has IP address, this interface and open, and the pairing PW state of this interface is when being opening that the protocol status of VE2 interface can be opened.Have only when the physical state of VE2 interface and protocol status are opened simultaneously, this VE2 Interface status is just for opening.When the VE2 Interface status was opened, the VE2 interface was issued to the sign of this interface configuration in the two L 3 virtual interfaces binding mapping table, and, be next-hop node configuration route:
1) if the VE2 interface is used to insert the far-end ce router, then at this time the dynamic routing protocol state just may be consulted success, if perhaps the VE2 interface is used to insert is static routing, then at this time static routing can become active; 2) if the VE2 interface as BRAS personal user's access interface, then at this time can carry out the protocol status negotiation that the user inserts, as PPPOE (point-to-point protocol on the Ethernet), DHCP protocol massages such as (dynamic host allocation protocols), after authentification of user inserts successfully, on the termination access device, can generate the routing relation that arrives between BRAS user and the VE2 interface.
Data message transmits described VE2 interface and ce router must have the MAC address learning ability if the VE2 interface will carry out with the ce router on the far-end PE equipment, the MAC Address of the ce router interface on the described VE2 interface study far-end PE equipment, the far-end ce router also will be learnt the virtual mac address of VE2 interface.In MPLS L3VPN network, data message from the process that the VE2 interface is sent to the ce router on the far-end PE equipment is: the VE2 interface is according to destination address the data message and source address information, search three layers of fib table item, find in the MPLS L3VPN network with data message in the PE equipment that directly links to each other of destination address, the VE2 interface that described VE2 interface basis finds in the fib table item is data message encapsulate inner layer label and outer layer label to the routing iinformation of far-end PE equipment, data message is transferred to from described VE2 interface on the PE equipment of far-end according to outer layer label, again by the PE equipment of far-end according to the vpn label of data message with described transfer of data to described ce router.In MPLS L3VPN network, the ce router access interface on described VE2 interface and the far-end PE is equivalent to the interface that directly links to each other.
By top introduction, be convenient to understand data message forwarding process and the data message forwarding process from MPLS L3VPN network to MPLS L2VPN network of following data message from MPLS L2VPN network to MPLS L3VPN network.
The data message forwarding of above-mentioned two processes comprises the steps: jointly
The step of the data message of transmitting between VE1 (VE2) interface is received and need be netted;
VE1 (vE2) interface finds the step of VE2 (VE1) interface corresponding with VE1 (VE2) interface identifier in two L 3 virtual interfaces binding mapping table;
VE1 (vE2) interface sends to data message the step of VE2 (VE1) interface.
Data message from MPLS L2VPN network to the repeating process of MPLS L3VPN network, the VE1 interface finds the step of the VE2 interface corresponding with the VE1 interface identifier to be specially in two L 3 virtual interfaces binding mapping table: the VE1 interface is according to internal layer VPN label lookup ILM (Incoming Label Map, go into the label mapping) list item (supposing that outer layer label ejects), discovery has MPLS L2VPN network termination sign, takes out VE1 interface corresponding identification from two L 3 virtual interfaces binding mapping table; At first, in two L 3 virtual interfaces binding mapping table, find this to identify pairing VE2 interface according to VE1 interface corresponding identification; Then, search the VE2 sub-interface according to user's message VLAN (VLAN) value.The VLAN value of data message and the corresponding relation of VE2 sub-interface need be set up in networking, the process of foundation is: is value that 0 VLAN mates first sub-interface to VE2, is value that 1 VLAN mates second sub-interface to VE2, is value that 2 VLAN mates the 3rd sub-interface to VE2, the rest may be inferred, is value that the VLAN of N (N for more than or equal to 0 integer) mates the individual sub-interface to VE2 M (M for more than or equal to 1 integer).
Because in MPLS L3VPN network, PE equipment is responsible for preserving and maintaining routing information, so at the MPLSL3VPN network in the data message forwarding process of MPLS L2VPN network, the VE2 interface finds the step of the VE1 interface corresponding with the VE2 interface identifier in two L 3 virtual interfaces bindings mapping table after, also comprise by searching the fib table item and find the step of the physical interface of the VE1 interface corresponding with the physical interface of VE2 interface
Search the ILM list item according to vpn label, in the ILM list item, find VPN ID (value of Virtual Private Network), dial vpn label then, expose the three layers of IP message, search the fib table item according to purpose IP address and VPN ID, obtain the VE2 sub-interface, then search the ARP list item according to purpose IP, obtain purpose user MAC, carry out two layers of information encapsulation of user; Then be identified in the two L 3 virtual interfaces binding mapping table and search corresponding VE1 interface according to the VE2 sub-interface, and find with it corresponding PW by the VE1 interface, thereby find corresponding two-layer label and two layers of physics outgoing interface, two layers of information that encapsulated are carried out the encapsulation of two layers of label again, send from the PW outer layer tunnel outgoing interface of VE1 interface correspondence.
The embodiment of the invention only need be used a termination access device between double layer network and three-layer network, just can realize the interconnected of double layer network and three-layer network, this termination access device both can be used as the termination equipment of double layer network, can be used as the access device of three-layer network again, saved a network equipment with respect to prior art, thereby reduced networking cost, and improved the flexibility of networking, and just can realize the communication of double layer network and three-layer network owing to only need use a termination access device, reduced the fault point of communication between net with respect to prior art, simplify the process of data message communication between net, thereby improved the reliability of communication between net.
The embodiment of the invention also provides a kind of system that is connected double layer network and three-layer network simultaneously, comprise a termination access device, be arranged between double layer network and the three-layer network, described termination access device comprises: at least one two-layer virtual interface is used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Be added with sign on the described two-layer virtual interface, be added with on the described L 3 virtual interface and the identical sign of described two-layer virtual interface; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table; Described L 3 virtual interface configuration has Media Access Control address.
The system that the embodiment of the invention provides, only need between double layer network and three-layer network, use a termination access device, just can realize the interconnected of double layer network and three-layer network, this termination access device both can be used as the termination equipment of double layer network, can be used as the access device of three-layer network again, saved a network equipment with respect to prior art, thereby reduced networking cost, and improved the flexibility of networking, and just can realize the communication of double layer network and three-layer network owing to only need use a termination access device, reduced the fault point of communication between net with respect to prior art, simplify the process of data message communication between net, thereby improved the reliability of communication between net.
The embodiment of the invention also provides a kind of system that is connected double layer network and three-layer network.This system comprises: client, LAC (Layer 2 Tunneling Protocol LAC) and LNS (L2TP Network Server).Described client is positioned at local area network (LAN), LAC and LNS all are positioned at three layers of IP public network edge, pass through the ppp link Data transmission between LAC and the client, between LAC and LNS, set up a ppp link, make between client and the LNS and can pass through the ppp link Data transmission by L2TP (Layer 2 Tunneling Protocol).
In the present embodiment, double layer network is a MPLS L2VPN network, and three-layer network is the three layers of IP public network at L2TP Tunnel place.
As shown in Figure 5, between MPLS L2VPN network and three layers of IP public network, set up a termination access device, on described termination access device, set up two virtual interfaces (supposing that interface type is VE), one of them virtual interface is the interface of MPLS L2VPN network, be used for ce interface (VE1) as MPLS L2VPN network, another virtual interface is the interface of three layers of IP public network, is used for the BRAS access interface (VE2) as the three layers of IP public network.
Two virtual interface VE1 and VE2 partner, and have corresponding sign.Be VE1 interface configuration sign, be VE2 interface configuration and the corresponding sign of VE1 interface, two virtual interface VE1 and VE2 can be associated according to sign, store the described sign that is used for related VE1 and VE2 interface into two L 3 virtual interfaces binding mapping table.
Described BRAS access interface is used to insert L2TP user, at this moment, described termination access device serves as two kinds of roles of LAC equipment of the PE equipment and the three layers of IP public network of MPLS L2VPN network simultaneously, on described termination access device, enter corresponding L2TP Tunnel, be linked into LNS and realize professional wholesale function according to user account.Present embodiment is by setting up the termination access device between MPLS L2VPN network and three layers of IP public network, and the method access L2TP user who on the termination access device, sets up virtual interface, can reduce by a networking equipment, reduce networking cost, improve networking flexibility and reliability.
In the time of the PW state up of VE1 interface correspondence, L2TP User Agreement message and data message just can arrive the termination access device by MPLS L2VPN network, after data message arrives this termination access device, at first peel off the outer layer label and the vpn label of data message, and, wherein have MPLS L2VPN network termination sign according to the ILM list item that vpn label is searched; For L2TP User Agreement message, network processing unit can be handled message up sending host protocol stack, at first be to carry out LCP (ICP) between client and LAC to consult, then can verify, after checking is passed through, LAC begins transparent LNS of being sent to of subsequent packet such as checking messages, just be equivalent between LNS and client, verify with IPCP (IP control protocol) and consult, after ipcp negotiation is passed through, ppp link between client and the LNS has just been set up, the upper strata Control Software just can be with PW tunnel and L2TP Tunnel, the corresponding relation of Tunnel Session (tunnel session) is issued in the microcode data forwarding aspect list item, the data message of subsequent user visit LNS direction need carry out the exchange of PW tunnel and L2TP Tunnel on LAC equipment.Concrete data forwarding flow process is described below:
For the data message of L2TP user capture LNS, at first need to pass through MPLS L2VPN network and arrive LAC, middle data forwarding flow process is identical with embodiment one; On LAC, peel off outer layer label and vpn label, and search the ILM list item according to vpn label, find MPLS L2VPN network termination sign, find corresponding L2TP Tunnel, carry out L2TP Tunnel encapsulation flow process, this L2TP Tunnel encapsulation flow process comprises: at first, carry out the encapsulation of L2TP Tunnel head, secondly, carry out port numbers and be 1701 UDP (User Datagram Protocol) head encapsulation, carry out IP head encapsulation (purpose IP address is the address, opposite end of L2TP Tunnel) at last, and then carry out general data according to this purpose IP address search fib table item and transmit, data forwarding is gone out, thereby finish of the exchange of PW tunnel to L2TP Tunnel; In the middle IP network of L2TP Tunnel process, can't see L2TP Tunnel encapsulation, carry out common IP according to the purpose IP of L2TP Tunnel and transmit and handle; Data arrive after the LNS equipment, at first search FIB and hit this machine address generation route according to purpose IP, number be 1701 to know that this data message is the L2TP message then according to udp port, carry out the decapsulation of L2TP Tunnel head again, expose user's message and carry out common IP forwarding, insert up three layers of IP public network or MPLS L3VPN network.
Return the data message of LAC direction for LNS, on LNS equipment, carry out the encapsulation of L2TP Tunnel and user PPP information; At the middle three layers of IP public network of L2TP Tunnel process, on LAC equipment, can't see L2TP Tunnel encapsulation, carry out common IP according to the purpose IP of L2TP Tunnel and transmit and handle; On LAC equipment, at first carry out the L2TP Tunnel termination, carry out L2TP decapsulation, find the PW tunnel of L2TP Tunnel correspondence, thereby encapsulation outer layer tunnel label and internal layer VPN label forward message, finish the exchange in L2TP Tunnel and PW tunnel.If between LAC and the client be the PPPOE link, then outside user PPP information header, also need to encapsulate the PPPOE head, and then encapsulate two-layer label message is forwarded.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (11)
1. means of communication that are connected double layer network and three-layer network is characterized in that, comprise the steps:
Two-layer virtual interface or L 3 virtual interface are received data message;
According to two-layer virtual interface identifier in the data message or L 3 virtual interface identifier, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface or two-layer virtual interface;
L 3 virtual interface or two-layer virtual interface are transmitted the data message of two-layer virtual interface or the transmission of L 3 virtual interface.
2. the means of communication of linking double layer network according to claim 1 and three-layer network is characterized in that, described double layer network is a multiprotocol label switching double-layer virtual private network; Described three-layer network is the multi-protocol label switching three-layer Virtual Private Network.
3. the means of communication of linking double layer network according to claim 1 and three-layer network, it is characterized in that, when described L 3 virtual interface is divided into an above sub-interface, according to two-layer virtual interface identifier in the data message, after in two L 3 virtual interfaces binding mapping table, finding corresponding L 3 virtual interface, also comprise: the sub-interface that finds corresponding L 3 virtual interface according to the VLAN value in the data message; Further, the step that described data message is sent to described L 3 virtual interface is specially, and described data message is sent to the described sub-interface of described L 3 virtual interface.
4. the means of communication of linking double layer network according to claim 1 and three-layer network, it is characterized in that, according to L 3 virtual interface identifier in the data message, before binding the step that finds corresponding two-layer virtual interface in the mapping table, two L 3 virtual interfaces also comprise: search the address analysis protocol table item according to purpose IP, obtain purpose user media accessing to control address, carry out two layers of information encapsulation of user.
5. a communication device that is connected double layer network and three-layer network is characterized in that, comprises at least one two-layer virtual interface, is used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table, and described communication device also comprises:
Search the unit, when described two-layer virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding L 3 virtual interface, described data message is sent to described L 3 virtual interface;
When described L 3 virtual interface is received data message, in two L 3 virtual interfaces binding mapping table, find corresponding two-layer virtual interface, described data message is sent to described two-layer virtual interface.
6. the communication device of linking double layer network according to claim 5 and three-layer network is characterized in that, described double layer network is a multiprotocol label switching double-layer virtual private network; Described three-layer network is the multi-protocol label switching three-layer Virtual Private Network.
7. the communication device of linking double layer network according to claim 5 and three-layer network is characterized in that, described L 3 virtual interface further comprises at least one sub-interface, is respectively applied for to transmit the data message with different virtual LAN value.
8. system that is connected double layer network and three-layer network, it is characterized in that, comprise a termination access device, be arranged between double layer network and the three-layer network, described termination access device comprises: at least one two-layer virtual interface is used for receiving, sending datagram; At least one L 3 virtual interface is used for receiving, sending datagram; Be added with sign on the described two-layer virtual interface, be added with on the described L 3 virtual interface and the identical sign of described two-layer virtual interface; Described two-layer virtual interface identifier and L 3 virtual interface identifier are stored in the two L 3 virtual interfaces binding mapping table; Described L 3 virtual interface configuration has Media Access Control address.
9. the system of linking double layer network according to claim 8 and three-layer network is characterized in that, described double layer network is a multiprotocol label switching double-layer virtual private network; Described three-layer network is the multi-protocol label switching three-layer Virtual Private Network.
10. the system of linking double layer network according to claim 8 and three-layer network is characterized in that, described L 3 virtual interface further comprises at least one sub-interface, is respectively applied for to transmit the data message with different virtual LAN value.
11. the system of linking double layer network according to claim 8 and three-layer network is characterized in that, described two layer interfaces dispose Media Access Control address.
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| CNA2007100765164A CN101110745A (en) | 2007-08-14 | 2007-08-14 | Method, device and system for engaging second layer network and third layer network |
| PCT/CN2008/071971 WO2009021458A1 (en) | 2007-08-14 | 2008-08-13 | Method, apparatus and system for connecting layer2 network and layer3 network |
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| CNA2007100765164A CN101110745A (en) | 2007-08-14 | 2007-08-14 | Method, device and system for engaging second layer network and third layer network |
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