CN109547346B - Method and system for establishing MPLS L2VPN service end-to-end model - Google Patents

Method and system for establishing MPLS L2VPN service end-to-end model Download PDF

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CN109547346B
CN109547346B CN201910008935.7A CN201910008935A CN109547346B CN 109547346 B CN109547346 B CN 109547346B CN 201910008935 A CN201910008935 A CN 201910008935A CN 109547346 B CN109547346 B CN 109547346B
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CN109547346A (en
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罗岳斌
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Fiberhome Telecommunication Technologies Co Ltd
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    • 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]
    • 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]

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Abstract

The invention discloses a method and a system for establishing an end-to-end model of MPLS L2VPN service, relating to the field of communication. The method comprises the following steps: determining basic attributes and PE nodes of the MPLS L2VPN service, determining UNI and PW of each PE node of the MPLS L2VPN service and DNI protection group information bound by the MPLS L2VPN service, and establishing an end-to-end model of the MPLS L2VPN service, wherein the end-to-end model comprises the following steps: the basic attribute of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node and DNI protection group information bound by the MPLS L2VPN service determined in the previous steps realize the unified description of the MPLS L2VPN service model. The invention realizes the uniform description of the MPLS L2VPN service model, so that the designed MPLS L2VPN service configuration and management interface has uniform style and similar operation modes, and is convenient for users to understand and master.

Description

Method and system for establishing MPLS L2VPN service end-to-end model
Technical Field
The invention relates to the field of communication, in particular to a method and a system for establishing an MPLS L2VPN service end-to-end model.
Background
MPLS (Multi-Protocol Label Switching) L2VPN (Layer 2Virtual Private Network) services can be divided into point-to-point services, multipoint-to-multipoint ethernet services (E-LAN: transparent ethernet transport Service), and point-to-multipoint ethernet services (E-Tree), where the point-to-point services include E-Line point-to-point ethernet services, CES (Circuit Emulation Service), and ATM (Asynchronous Transfer Mode) Emulation services.
With the development of transmission technology, the reliability requirements of users and operators on transmission networks are higher and higher, networking modes are more and more complex, and E-Line/CES/ATM services are developed from a single one-source one-host model to a one-source one-host, one-source two-host and two-source two-host model. E-Tree (Ethernet Tree) service is also developed from a single multi-leaf node model to a single multi-leaf node, double multi-leaf nodes and a layered E-Tree model.
In order to configure and manage the MPLS L2VPN service, an end-to-end model of the MPLS L2VPN service needs to be established, and the current modeling method has the following problems:
the existing point-to-point service (E-Line/CES/ATM), multipoint-to-multipoint service (E-LAN) and point-to-multipoint service (E-Tree) models are not consistent in description mode, and the designed configuration and management interfaces are not consistent, so that users are difficult to understand and operate.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a method and a system for establishing an MPLS L2VPN service end-to-end model, which realize the uniform description of the MPLS L2VPN service model, so that the designed MPLS L2VPN service configuration and management interface has uniform style and similar operation mode, and is convenient for users to understand and master.
In a first aspect, a method for establishing an end-to-end model of MPLS L2VPN service is provided, which includes the following steps:
determining basic attributes of MPLS L2VPN services of a multi-protocol label switching two-layer virtual private network and PE nodes of an operator edge router;
determining user network interface UNI of each PE node of MPLS L2VPN service, pseudo wire PW and double-node interconnection DNI protection group information bound by the MPLS L2VPN service;
establishing an end-to-end model of MPLS L2VPN services, comprising: the basic attribute of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node and DNI protection group information bound by the MPLS L2VPN service determined in the previous steps realize the unified description of the MPLS L2VPN service model.
According to the first aspect, in a first possible implementation manner of the first aspect, the basic attributes of the MPLS L2VPN service include a service type, a service direction, a networking mode, a service name, customer information, and a user label; the service types comprise point-to-point Ethernet service E-Line, circuit emulation service CES, asynchronous transfer mode ATM, transparent Ethernet transmission service E-LAN and point-to-multipoint Ethernet service E-Tree; the service direction comprises a user side to a network side and a user side to a user side; the networking mode comprises one source one host, one source two host, two source two host, single root Tree, double root Tree, full connection and self-definition;
determining a PE node of MPLS L2VPN service, comprising the following steps:
determining the number of PE nodes according to the service type, the service direction and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PE nodes is fixed to 1;
E-Line/CES/ATM service from user side to network side: according to different selection of networking modes, the number of the PE nodes is respectively as follows: 2, corresponding to a source-sink mode; 3, corresponding to a one-source two-sink mode; 4, corresponding to a two-source two-sink mode;
E-LAN/E-Tree service from user side to network side: the number of PE nodes > 2, which is determined by the user.
According to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, determining a UNI of each PE node of an MPLS L2VPN service includes the following steps:
determining the number of UNIs of each PE node according to the determined number of the PE nodes and the role of each PE node:
E-Line/CES/ATM service from user side to user side: the number of UNIs of the PE nodes is fixed to 2; E-Line/CES/ATM service from user side to network side: the number of UNIs of the PE node is fixed to 1;
user side to user side E-LAN service: the UNI number > of the PE node is 2, and is determined by a user; E-LAN service from user side to network side: the UNI number > of the PE node is 1 and is determined by a user;
E-Tree service from user side to network side: the number of UNIs of the root node is 1, and the number is determined by a user; the UNI number > of the secondary aggregation node of the layered E-Tree service is 0 and is determined by a user; the number of UNIs of a leaf node is fixed to 1.
According to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, determining a PW of each PE node of an MPLS L2VPN service includes the following steps:
determining the number of PWs of each PE node according to the determined number of PE nodes and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PW is 0;
E-Line/CES/ATM service from user side to network side: according to different networking modes, the PW number of each PE node is respectively as follows: 1 or 2, corresponding to a source-sink mode; 2, corresponding to a source-sink mode; 2, corresponding to a two-source two-sink mode;
E-LAN service from user side to network side: the number > of PW of each PE node is 1 and is determined by a user;
E-Tree service from user side to network side:
single root and dual root E-Tree services: the number of PW of the root node is equal to that of the leaf nodes;
E-Tree service of single root and user-defined networking mode: when no PW protection exists, the number of PWs of leaf nodes is equal to 1; when PW1+1/1:1 protection exists, the number of PWs of leaf nodes is equal to 2;
double root E-Tree service: the number of PW of leaf nodes is equal to 2;
E-Tree service of the user-defined networking mode: the number > of PWs of the root node is 1 and is determined by the user.
According to the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the determining DNI protection group information of MPLS L2VPN service binding includes the following steps:
according to the selected service type and networking mode, when the service type is E-Line/CES/ATM, if the networking mode is one source and two sinks, a DNI protection group is bound between the sink node and the standby sink node; if the networking mode is two-source two-sink, one DNI protection group is bound between the source node and the standby source node, and one DNI protection group is bound between the sink node and the standby sink node, wherein the DNI protection group information of each binding comprises DNI protection group object identification and a binding sequence number of MPLS L2VPN service in the DNI protection group.
In a second aspect, a system for establishing an end-to-end model of MPLS L2VPN traffic is provided, the system comprising:
a basic attribute determination unit for: determining basic attributes of MPLS L2VPN services of a multi-protocol label switching two-layer virtual private network;
a PE node determining unit configured to: determining provider edge router (PE) nodes of MPLS L2VPN services, a User Network Interface (UNI) of each PE node and a Pseudo Wire (PW);
a DNI protected group information determination unit for: after the basic attribute of the MPLS L2VPN service and the PE node are determined, determining double-node interconnection DNI protection group information bound by the MPLS L2VPN service;
an end-to-end model building unit for: and establishing an end-to-end model of the MPLS L2VPN service according to the determined basic attribute of the MPLS L2VPN service, the PE nodes, the UNI and PW of each PE node and the bound DNI protection group information, so as to realize the uniform description of the MPLS L2VPN service model.
According to the second aspect, in a first possible implementation manner of the second aspect, the basic attributes of the MPLS L2VPN service include a service type, a service direction, a networking mode, a service name, customer information, and a user label; the service types comprise point-to-point Ethernet service E-Line, circuit emulation service CES, asynchronous transfer mode ATM, transparent Ethernet transmission service E-LAN and point-to-multipoint Ethernet service E-Tree; the service direction comprises a user side to a network side and a user side to a user side; the networking mode comprises one source one host, one source two host, two source two host, single root Tree, double root Tree, full connection and self-definition;
the PE node determining unit determines the PE node of the MPLS L2VPN service, and comprises the following steps:
determining the number of PE nodes according to the service type, the service direction and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PE nodes is fixed to 1;
E-Line/CES/ATM service from user side to network side: according to different selection of networking modes, the number of the PE nodes is respectively as follows: 2, corresponding to a source-sink mode; 3, corresponding to a one-source two-sink mode; 4, corresponding to a two-source two-sink mode;
E-LAN/E-Tree service from user side to network side: the number of PE nodes > 2, which is determined by the user.
According to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining, by the PE node determining unit, a UNI of each PE node of the MPLS L2VPN service includes the following steps:
determining the number of UNIs of each PE node according to the determined number of the PE nodes and the role of each PE node:
E-Line/CES/ATM service from user side to user side: the number of UNIs of the PE nodes is fixed to 2; E-Line/CES/ATM service from user side to network side: the number of UNIs of the PE node is fixed to 1;
user side to user side E-LAN service: the UNI number > of the PE node is 2, and is determined by a user; E-LAN service from user side to network side: the UNI number > of the PE node is 1 and is determined by a user;
E-Tree service from user side to network side: the number of UNIs of the root node is 1, and the number is determined by a user; the UNI number > of the secondary aggregation node of the layered E-Tree service is 0 and is determined by a user; the number of UNIs of a leaf node is fixed to 1.
According to the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the determining, by the PE node determining unit, a PW of each PE node of an MPLS L2VPN service includes the following steps:
determining the number of PWs of each PE node according to the determined number of PE nodes and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PW is 0;
E-Line/CES/ATM service from user side to network side: according to different networking modes, the PW number of each PE node is respectively as follows: 1 or 2, corresponding to a source-sink mode; 2, corresponding to a source-sink mode; 2, corresponding to a two-source two-sink mode;
E-LAN service from user side to network side: the number > of PW of each PE node is 1 and is determined by a user;
E-Tree service from user side to network side:
single root and dual root E-Tree services: the number of PW of the root node is equal to that of the leaf nodes;
E-Tree service of single root and user-defined networking mode: when no PW protection exists, the number of PWs of leaf nodes is equal to 1; when PW1+1/1:1 protection exists, the number of PWs of leaf nodes is equal to 2;
double root E-Tree service: the number of PW of leaf nodes is equal to 2;
E-Tree service of the user-defined networking mode: the number > of PWs of the root node is 1 and is determined by the user.
According to the first possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the determining the DNI protection group information of the MPLS L2VPN service binding by the DNI protection group information determining unit includes the following steps:
according to the selected service type and networking mode, when the service type is E-Line/CES/ATM, if the networking mode is one source and two sinks, a DNI protection group is bound between the sink node and the standby sink node; if the networking mode is two-source two-sink, binding a DNI protection group between the source node and the standby source node, and simultaneously binding a DNI protection group between the sink node and the standby sink node; and the DNI protection group information of each binding comprises DNI protection group object identification and a binding sequence number of MPLS L2VPN service in the DNI protection group.
Compared with the prior art, the embodiment of the invention has the following advantages:
(1) the embodiment of the invention determines the basic attribute and PE node of the MPLS L2VPN service, determines UNI and PW of each PE node of the MPLS L2VPN service and DNI protection group information bound by the MPLS L2VPN service, establishes an end-to-end model of the MPLS L2VPN service, and realizes the uniform description of the MPLS L2VPN service model, so that the designed MPLS L2VPN service has uniform configuration and management interface style, similar operation modes and is convenient for users to understand and master.
(2) The embodiment of the invention establishes an end-to-end model of the MPLS L2VPN service based on an abstract principle from top to bottom, simultaneously realizes the universality and expandability of the MPLS L2VPN service model, and can describe various existing MPLS L2VPN service models: the system comprises a first-source one-sink service, a first-source two-sink service, a second-source two-sink E-Line/CES/ATM service, a single-root E-Tree, a double-root E-Tree, a layered E-Tree, an E-LAN, a single-node E-Line and a single-node E-LAN, and has good expansibility for a new L2VPN service model in the future.
Drawings
Fig. 1 is a flowchart of a method for establishing an end-to-end model of MPLS L2VPN service in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an end-to-end model of MPLS L2VPN traffic in an embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a user-side-to-user-side E-Line/CES/ATM service using an end-to-end model of MPLS L2VPN service in an embodiment of the present invention.
Fig. 4 is a schematic diagram depicting customer-side-to-customer-side E-LAN traffic using an end-to-end model of MPLS L2VPN traffic in an embodiment of the present invention.
Fig. 5 is a schematic diagram for describing a user side to network side E-Line service by using an end-to-end model of MPLS L2VPN service in the embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating a user-side to network-side E-LAN service using an end-to-end model of MPLS L2VPN service in an embodiment of the present invention.
Fig. 7 is a schematic diagram for describing a single E-Tree service by using an end-to-end model of an MPLS L2VPN service in the embodiment of the present invention.
FIG. 8 is a diagram illustrating a two-source two-sink E-Line/CES/ATM service according to an end-to-end model of MPLS L2VPN service in an embodiment of the present invention.
Fig. 9 is a schematic diagram for describing a hierarchical E-Tree service by using an end-to-end model of an MPLS L2VPN service in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
Referring to fig. 1, an embodiment of the present invention provides a method for establishing an end-to-end model of an MPLS L2VPN service, including the following steps:
s1, determining basic attributes and PE (Provider Edge) nodes of MPLS L2VPN services;
s2, determining UNI (User Network Interface), PW (Pseudo Wire) and DNI (Dual Node Interconnection) protection group information bound by MPLS L2VPN service of each PE Node of MPLS L2VPN service;
s3, referring to fig. 2, establishing an end-to-end model of MPLS L2VPN service includes: the basic attribute of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node and DNI protection group information bound by the MPLS L2VPN service determined in the previous steps realize the unified description of the MPLS L2VPN service model.
The basic attributes of MPLS L2VPN traffic include traffic type, traffic direction, networking mode, traffic name, customer information, user label, etc.
Referring to fig. 2, in the embodiment of the present invention, an MPLS L2VPN communication process is abstracted into a series of communication processes between logical nodes (i.e., PE nodes), where an MPLS L2VPN service is composed of 1 to n ordered logical nodes (PE nodes), where n is a positive integer, a plurality of logical nodes (PE nodes) may belong to a network element at the same time, and each PE node has a unique number in the MPLS L2 VPN.
Referring to fig. 2, each PE node of the MPLS L2VPN service includes 0 to n UNI interfaces, and the UNI interfaces may be ethernet physical interfaces, ethernet subinterfaces, LAG (Link Aggregation Group) main interfaces, LAG subinterfaces, CES emulation interfaces, ATM interfaces, or the like.
The UNI interface in the PE node of the MPLS L2VPN service only comprises UNI interface object identification, and the attribute of the UNI interface is independently modeled by each UNI interface object.
Referring to fig. 2, each PE node of the MPLS L2VPN service includes 0 to n PWs, and if direct communication is required between two PE nodes, 1 to 2 PWs are included between the two PE nodes.
Referring to fig. 2, after the basic attribute of the MPLS L2VPN service and the PE node are determined, DNI protection group information bound to the MPLS L2VPN service is determined. The MPLS L2VPN service comprises 0 to n bound DNI protection group information, and each bound DNI protection group information comprises a DNI protection group object identifier and a binding serial number of the MPLS L2VPN service in the DNI protection group.
The embodiment of the invention realizes the uniform description of the MPLS L2VPN service model, so that the designed MPLS L2VPN service configuration and management interface has uniform style and similar operation modes, and is convenient for users to understand and master.
Example 2
The embodiment of the invention provides a system for establishing an end-to-end model of MPLS L2VPN service, which comprises a basic attribute determining unit, a PE node determining unit, a DNI protection group information determining unit and an end-to-end model establishing unit, wherein:
a basic attribute determination unit for: determining basic attributes of MPLS L2VPN services;
a PE node determining unit configured to: determining PE nodes of MPLS L2VPN service, UNI and PW of each PE node;
a DNI protected group information determination unit for: after the basic attribute of the MPLS L2VPN service and the PE node are determined, DNI protection group information bound by the MPLS L2VPN service is determined;
an end-to-end model building unit for: and establishing an end-to-end model of the MPLS L2VPN service according to the determined basic attribute of the MPLS L2VPN service, the PE nodes, the UNI and PW of each PE node and the bound DNI protection group information, so as to realize the uniform description of the MPLS L2VPN service model.
The basic attributes of MPLS L2VPN traffic include traffic type, traffic direction, networking mode, traffic name, customer information, user label, etc.
The embodiment of the invention abstracts the communication process of the MPLS L2VPN into a series of communication processes among logical nodes (namely PE nodes), the MPLS L2VPN service consists of 1-n ordered logical nodes (PE nodes), n is a positive integer, a plurality of logical nodes (PE nodes) can belong to a network element at the same time, and each PE node has a unique number in the MPLS L2 VPN.
Each PE node of the MPLS L2VPN service includes 0 to n UNI interfaces, which may be ethernet physical interfaces, ethernet subinterfaces, LAG (Link Aggregation Group) main interfaces, LAG subinterfaces, CES emulation interfaces, ATM interfaces, or the like.
The UNI interface in the PE node of the MPLS L2VPN service only comprises UNI interface object identification, and the attribute of the UNI interface is independently modeled by each UNI interface object.
Each PE node of the MPLS L2VPN service contains 0 to n PWs, and if direct communication is required between two PE nodes, 1 to 2 PWs are contained between the two PE nodes.
The MPLS L2VPN service comprises 0 to n bound DNI protection group information, and each bound DNI protection group information comprises a DNI protection group object identifier and a binding serial number of the MPLS L2VPN service in the DNI protection group.
The embodiment of the invention realizes the uniform description of the MPLS L2VPN service model, so that the designed MPLS L2VPN service configuration and management interface has uniform style and similar operation modes, and is convenient for users to understand and master.
Example 3
As a preferred implementation manner, on the basis of embodiment 1 or 2, the basic attributes of the MPLS L2VPN service include a service type, a service direction, a networking mode, a service name, customer information, a user label, and the like, where the service type includes E-Line, CES, ATM, E-LAN, and E-Tree; the service direction comprises a user side to a network side and a user side to a user side; the networking mode comprises one source one host, one source two host, two source two host, single root Tree, double root Tree, full connection, self-definition and the like.
As a preferred embodiment, after determining the basic attribute of the MPLS L2VPN service, determining the PE node of the MPLS L2VPN service includes the following steps:
determining the number of PE nodes according to the selected service type, service direction and networking mode and according to the following table 1:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PE nodes is fixed to 1.
E-Line/CES/ATM service from user side to network side: according to different selection of networking modes, the number of the PE nodes is respectively as follows: 2 (corresponding to a source-sink mode), 3 (corresponding to a source-sink mode), and 4 (corresponding to a source-sink mode).
E-LAN/E-Tree service from user side to network side: the number of PE nodes > 2, which is determined by the user.
TABLE 1 determination of PE node number and role when describing MPLS L2 VPNs of different traffic types using unified model
Figure BDA0001936482130000121
Figure BDA0001936482130000131
Example 4
As a preferred implementation, on the basis of embodiment 3, after determining the basic attribute of the MPLS L2VPN service and the PE node, determining a UNI of each PE node of the MPLS L2VPN service includes the following steps:
determining the number of UNIs of each PE node according to the determined number of the PE nodes and the role of each PE node and according to the following table 2:
E-Line/CES/ATM service from user side to user side: the number of UNIs of the PE nodes is fixed to 2; E-Line/CES/ATM service from user side to network side: the number of UNIs of each PE node is fixed to 1.
User side to user side E-LAN service: the UNI number > of the PE node is 2, and is determined by a user; E-LAN service from user side to network side: the number of UNIs > of the PE node is 1, and is determined by the user.
E-Tree service from user side to network side: the number of UNIs of the root node is 1, and the number is determined by a user; the UNI number > of the secondary aggregation node of the layered E-Tree service is 0 and is determined by a user; the number of UNIs of a leaf node is fixed to 1.
Table 2, UNI number of PE determined when MPLS L2VPN of different service types is described by using unified model
Figure BDA0001936482130000141
Example 5
As a preferred implementation manner, on the basis of embodiment 3, after determining the basic attribute of the MPLS L2VPN service and the PE node, determining the PW of each PE node of the MPLS L2VPN service includes the following steps:
determining the number of PWs of each PE node according to the determined number of PE nodes and a networking mode and according to the following table 3:
user side to user side E-Line/CES/ATM/E-LAN service: PW data are not needed, and the number of the PWs is 0.
E-Line/CES/ATM service from user side to network side: according to different networking modes, the PW number of each PE node is respectively as follows: 1 or 2 (corresponding to a source-sink mode), 2 (corresponding to a source-sink mode).
E-LAN service from user side to network side: the number of PWs > of each PE node is 1, and is determined by the user.
E-Tree service from user side to network side:
single root and dual root E-Tree services: the number of PW of the root node is equal to the number of leaf nodes.
E-Tree service of single root and user-defined networking mode: when no PW protection exists, the number of PWs of leaf nodes is equal to 1; when PW1+1/1:1 protection exists, the number of PWs of leaf nodes is equal to 2.
Double root E-Tree service: the number of PWs for a leaf node is equal to 2.
E-Tree service of the user-defined networking mode: the number > of PWs of the root node is 1 and is determined by the user.
Table 3, determining the PW number of PE when describing MPLS L2VPN of different service types by using unified model
Figure BDA0001936482130000151
Example 6
As a preferred implementation manner, on the basis of embodiment 3, after determining the basic attribute of the MPLS L2VPN service and the PE node, determining DNI protection group information of the MPLS L2VPN service binding includes the following steps:
according to the selected service type and networking mode, when the service type is E-Line/CES/ATM,
if the networking mode is one source and two sinks, a DNI protection group needs to be bound between the sink node and the standby sink node;
if the networking mode is two-source two-sink, a DNI protection group needs to be bound between the source node and the standby source node, and a DNI protection group needs to be bound between the sink node and the standby sink node.
And the DNI protection group information of each binding comprises DNI protection group object identification and a binding sequence number of MPLS L2VPN service in the DNI protection group.
When the service type is E-Tree service, DNI binding protection group information is generally not considered.
Example 7
As a preferred implementation manner, on the basis of embodiment 3, an end-to-end model of the MPLS L2VPN service is established according to the determined basic attributes of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node, and DNI protection group information bound to the MPLS L2VPN service.
As a preferred embodiment, referring to fig. 3, when describing an E-Line/CES/ATM service from a user side to the user side by using an end-to-end model of an MPLS L2VPN service in the embodiment of the present invention, a PE node and 2 UNI interfaces may be used for description.
Referring to fig. 4, when an end-to-end model of MPLS L2VPN service in the embodiment of the present invention is used to describe E-LAN service from a user side to the user side, there is only one PE node and 3 UNI interfaces (the number of UNI interfaces may be > < 2 ").
Referring to fig. 5, when an end-to-end model of MPLS L2VPN service in the embodiment of the present invention is used to describe an E-Line service from a user side to a network side, the E-Line/CES/ATM service can be described in a manner of using two PE nodes and 1 PW per PE node, and the PE nodes are respectively in the role of a source node and a sink node.
Referring to fig. 6, when describing an E-LAN service from a user side to a network side by using an end-to-end model of an MPLS L2VPN service according to an embodiment of the present invention, description may be performed in a manner that a plurality of PE nodes each include a plurality of UNIs and a plurality of PWs.
Referring to fig. 7, when a single E-Tree service is described by using an end-to-end model of MPLS L2VPN service in the embodiment of the present invention, multiple PE nodes may be used, where one of the PE nodes is a root node (multiple UNIs, multiple PWs), and the other PE nodes is a leaf node (1 UNI, 1 PW).
Referring to fig. 8, when the end-to-end model of the MPLS L2VPN service in the embodiment of the present invention is used to describe the two-source and two-sink E-Line/CES/ATM service, 4 PE nodes may be used, and the node roles are respectively a source node, a sink node, a standby source node, and a standby sink node, where each PE node includes a description in a manner of 1 UNI and 2 PWs and also includes 2 pieces of bound DNI protection group information.
Referring to fig. 9, when a hierarchical E-Tree service is described by using an end-to-end model of an MPLS L2VPN service in the embodiment of the present invention, the difference from fig. 7 is that: the sink node has only PW and no UNI.
The embodiment of the invention establishes an end-to-end model of the MPLS L2VPN service based on an abstract principle from top to bottom, simultaneously realizes the universality and expandability of the MPLS L2VPN service model, and can describe various existing MPLS L2VPN service models: the system comprises a first-source one-sink service, a first-source two-sink service, a second-source two-sink E-Line/CES/ATM service, a single-root E-Tree, a double-root E-Tree, a layered E-Tree, an E-LAN, a single-node E-Line and a single-node E-LAN, and has good expansibility for a new L2VPN service model in the future.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.

Claims (2)

1. A method for establishing an MPLS L2VPN service end-to-end model is characterized by comprising the following steps:
determining basic attributes of MPLS L2VPN services of a multi-protocol label switching two-layer virtual private network and PE nodes of an operator edge router;
determining user network interface UNI of each PE node of MPLS L2VPN service, pseudo wire PW and double-node interconnection DNI protection group information bound by the MPLS L2VPN service;
establishing an end-to-end model of MPLS L2VPN services, comprising: the basic attribute of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node and DNI protection group information bound by the MPLS L2VPN service determined in the previous step realize the uniform description of the MPLS L2VPN service model;
the basic attributes of the MPLS L2VPN service comprise a service type, a service direction, a networking mode, a service name, customer information and a user label; the service types comprise point-to-point Ethernet service E-Line, circuit emulation service CES, asynchronous transfer mode ATM, transparent Ethernet transmission service E-LAN and point-to-multipoint Ethernet service E-Tree; the service direction comprises a user side to a network side and a user side to a user side; the networking mode comprises one source one host, one source two host, two source two host, single root Tree, double root Tree, full connection and self-definition;
determining a PE node of MPLS L2VPN service, comprising the following steps:
determining the number of PE nodes according to the service type, the service direction and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PE nodes is fixed to 1;
E-Line/CES/ATM service from user side to network side: according to different selection of networking modes, the number of the PE nodes is respectively as follows: 2, corresponding to a source-sink mode; 3, corresponding to a one-source two-sink mode; 4, corresponding to a two-source two-sink mode;
E-LAN/E-Tree service from user side to network side: the number of PE nodes is 2, which is determined by the user;
determining a UNI for each PE node of an MPLS L2VPN service, comprising the steps of:
determining the number of UNIs of each PE node according to the determined number of the PE nodes and the role of each PE node:
E-Line/CES/ATM service from user side to user side: the number of UNIs of the PE nodes is fixed to 2; E-Line/CES/ATM service from user side to network side: the number of UNIs of the PE node is fixed to 1;
user side to user side E-LAN service: the UNI number > of the PE node is 2, and is determined by a user; E-LAN service from user side to network side: the UNI number > of the PE node is 1 and is determined by a user;
E-Tree service from user side to network side: the number of UNIs of the root node is 1, and the number is determined by a user; the UNI number > of the secondary aggregation node of the layered E-Tree service is 0 and is determined by a user; the number of UNIs of leaf nodes is fixed to 1;
determining a PW for each PE node of MPLS L2VPN traffic, comprising the steps of:
determining the number of PWs of each PE node according to the determined number of PE nodes and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PW is 0;
E-Line/CES/ATM service from user side to network side: according to different networking modes, the PW number of each PE node is respectively as follows: 1 or 2, corresponding to a source-sink mode; 2, corresponding to a source-sink mode; 2, corresponding to a two-source two-sink mode;
E-LAN service from user side to network side: the number > of PW of each PE node is 1 and is determined by a user;
E-Tree service from user side to network side:
single root and dual root E-Tree services: the number of PW of the root node is equal to that of the leaf nodes;
E-Tree service of single root and user-defined networking mode: when no PW protection exists, the number of PWs of leaf nodes is equal to 1; when PW1+1/1:1 protection exists, the number of PWs of leaf nodes is equal to 2;
double root E-Tree service: the number of PW of leaf nodes is equal to 2;
E-Tree service of the user-defined networking mode: the number > of PW of the root node is 1, and the number is determined by a user;
the method for determining the DNI protection group information of the MPLS L2VPN service binding comprises the following steps:
according to the selected service type and networking mode, when the service type is E-Line/CES/ATM, if the networking mode is one source and two sinks, a DNI protection group is bound between the sink node and the standby sink node; if the networking mode is two-source two-sink, binding a DNI protection group between the source node and the standby source node, and simultaneously binding a DNI protection group between the sink node and the standby sink node;
and the DNI protection group information of each binding comprises DNI protection group object identification and a binding sequence number of MPLS L2VPN service in the DNI protection group.
2. A system for establishing an end-to-end model of MPLS L2VPN traffic, the system comprising:
a basic attribute determination unit for: determining basic attributes of MPLS L2VPN services of a multi-protocol label switching two-layer virtual private network;
a PE node determining unit configured to: determining provider edge router (PE) nodes of MPLS L2VPN services, a User Network Interface (UNI) of each PE node and a Pseudo Wire (PW);
a DNI protected group information determination unit for: after the basic attribute of the MPLS L2VPN service and the PE node are determined, determining double-node interconnection DNI protection group information bound by the MPLS L2VPN service;
an end-to-end model building unit for: establishing an end-to-end model of the MPLS L2VPN service according to the determined basic attribute of the MPLS L2VPN service, the PE nodes, UNI and PW of each PE node and the bound DNI protection group information, and realizing the uniform description of the MPLS L2VPN service model;
the basic attributes of the MPLS L2VPN service comprise a service type, a service direction, a networking mode, a service name, customer information and a user label; the service types comprise point-to-point Ethernet service E-Line, circuit emulation service CES, asynchronous transfer mode ATM, transparent Ethernet transmission service E-LAN and point-to-multipoint Ethernet service E-Tree; the service direction comprises a user side to a network side and a user side to a user side; the networking mode comprises one source one host, one source two host, two source two host, single root Tree, double root Tree, full connection and self-definition;
the PE node determining unit determines the PE node of the MPLS L2VPN service, and comprises the following steps:
determining the number of PE nodes according to the service type, the service direction and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PE nodes is fixed to 1;
E-Line/CES/ATM service from user side to network side: according to different selection of networking modes, the number of the PE nodes is respectively as follows: 2, corresponding to a source-sink mode; 3, corresponding to a one-source two-sink mode; 4, corresponding to a two-source two-sink mode;
E-LAN/E-Tree service from user side to network side: the number of PE nodes is 2, which is determined by the user;
the PE node determining unit determines a UNI of each PE node of the MPLS L2VPN service, and comprises the following steps:
determining the number of UNIs of each PE node according to the determined number of the PE nodes and the role of each PE node:
E-Line/CES/ATM service from user side to user side: the number of UNIs of the PE nodes is fixed to 2; E-Line/CES/ATM service from user side to network side: the number of UNIs of the PE node is fixed to 1;
user side to user side E-LAN service: the UNI number > of the PE node is 2, and is determined by a user; E-LAN service from user side to network side: the UNI number > of the PE node is 1 and is determined by a user;
E-Tree service from user side to network side: the number of UNIs of the root node is 1, and the number is determined by a user; the UNI number > of the secondary aggregation node of the layered E-Tree service is 0 and is determined by a user; the number of UNIs of leaf nodes is fixed to 1;
the PE node determining unit determines the PW of each PE node of the MPLS L2VPN service, and comprises the following steps:
determining the number of PWs of each PE node according to the determined number of PE nodes and the networking mode:
user side to user side E-Line/CES/ATM/E-LAN service: the number of PW is 0;
E-Line/CES/ATM service from user side to network side: according to different networking modes, the PW number of each PE node is respectively as follows: 1 or 2, corresponding to a source-sink mode; 2, corresponding to a source-sink mode; 2, corresponding to a two-source two-sink mode;
E-LAN service from user side to network side: the number > of PW of each PE node is 1 and is determined by a user;
E-Tree service from user side to network side:
single root and dual root E-Tree services: the number of PW of the root node is equal to that of the leaf nodes;
E-Tree service of single root and user-defined networking mode: when no PW protection exists, the number of PWs of leaf nodes is equal to 1; when PW1+1/1:1 protection exists, the number of PWs of leaf nodes is equal to 2;
double root E-Tree service: the number of PW of leaf nodes is equal to 2;
E-Tree service of the user-defined networking mode: the number > of PW of the root node is 1, and the number is determined by a user;
the DNI protection group information determining unit determines the DNI protection group information bound by the MPLS L2VPN service, and comprises the following steps:
according to the selected service type and networking mode, when the service type is E-Line/CES/ATM, if the networking mode is one source and two sinks, a DNI protection group is bound between the sink node and the standby sink node; if the networking mode is two-source two-sink, binding a DNI protection group between the source node and the standby source node, and simultaneously binding a DNI protection group between the sink node and the standby sink node; and the DNI protection group information of each binding comprises DNI protection group object identification and a binding sequence number of MPLS L2VPN service in the DNI protection group.
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