CN101132371A

CN101132371A - Pseudo-wire business protection method

Info

Publication number: CN101132371A
Application number: CNA2007101470076A
Authority: CN
Inventors: 文春
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-08-11
Filing date: 2007-08-11
Publication date: 2008-02-27
Anticipated expiration: 2027-08-11
Also published as: CN101132371B

Abstract

This invention puts forward a protection method for PW service, which sets up a residual bandwidth databse of PSN tunnel and searches for PSN tunnel combination meeting the requirement of the being protected PW service bandwidth in the database to constitute a logic PSN tunnel and turns the PW service to the logic PSN tunnel to protect the PW service when testing that the current multiplex PSN tunnel of the PW service is faulty.

Description

A kind of guard method of pseudo-line service

Technical field

The present invention relates to the communications field, particularly a kind of guard method of pseudo-line service.

Background technology

Pseudo-line (PW, Pseudo Wire) be a kind of at packet switching network (PSN, Packet SwitchNetwork) goes up the mechanism of simulating various point to point service, PTP, the business that simulated can be time division multiplexing (TDM, Time Division Multiplex and Multiplexer) special line, asynchronous transfer mode (ATMAsynchronous Transfer Model), frame relay (FR, Frame Relay) or Ethernet etc.PW can utilize the tunneling mechanism on the PSN to simulate a kind of necessary attribute of business.PW can encapsulate the protocol Data Unit (PDU, Protocol Data Unit) of special services, and PDU contains necessary data of emulation special services and control information in the inside.The PW emulation mechanisms can be transferred to all transport services the network of a fusion, among multi protocol label exchange (MPLS, Multi Protocol Label Switching) or Internet protocol (IP, Internet protocol).From user's angle, PW can be considered to a kind of link or circuit of special use.

Traditional PW protection passage all is the unidirectional PSN tunnel that utilizes, and the service protection of PW emulation just is subject to a certain PSN tunnel like this, when protecting channel failure on the one hand, makes that professional protected reliability is not high; When two internodal arbitrary PSN tunnel bandwidth of carrying PW business all can not satisfy the service protection demand, this business just can not be protected on the other hand.

The data transmission method and the system of a patent CN200510009215 multi-protocol label switching network; mention at label switched path (LSP; Label Switched Path) when breaking down; in time out of order LSP is stopped distributing data, the present invention does not utilize the remaining bandwidth of LSP to realize the think of of the defencive function of PW business

Summary of the invention

The present invention proposes a kind of guard method of pseudo-line service, find out and utilize the remaining bandwidth of PSN tunnel in the network to realize protection the business of PW emulation.To solve the problems referred to above that prior art exists, improve utilization of network bandwidth, strengthen the reliability of protection.

The guard method of the PW business that the present invention proposes utilizes many PSN tunnel remaining bandwidths that the PW business is protected, and it is characterized in that, may further comprise the steps:

A) set up packet network tunnel remaining bandwidth database, record packet network tunnel bandwidth is used information;

B) obtain the bandwidth parameter of the pseudo-line service that needs protection, the packet network tunnel combination of bandwidth demand is satisfied in search in packet network tunnel remaining bandwidth database, forms logic packet network tunnel;

C),, then pseudo-line service is switched to logic packet network tunnel if detect the current multiplexing packet network tunnel fails of pseudo-line service with the protection passage of logic packet network tunnel as pseudo-line service;

D), then utilize the packet network tunnel remaining bandwidth in the packet network tunnel remaining bandwidth database to substitute if there is new business to insert the remaining bandwidth that need take the packet network tunnel in the logic packet network tunnel.

Further, the tunnel bandwidth of packet network described in the step a) uses the information content to comprise source node, destination node, identifier, the remaining bandwidth in packet network tunnel and the bandwidth that is taken by logic packet network tunnel.

Further, in the step d),, then insert new business, abandon protecting passage if can not find new bandwidth combination; Or abandon inserting new business, keep the protection passage.

If the multiplexing former packet network tunnel restoration of pseudo-line service is then returned switching services to former passage, or switching services is not gone back to former tunnel.

The PSN tunnel remaining bandwidth that utilizes that the present invention proposes carries out the method for PW service protection, has made full use of the remaining bandwidth in the network, has increased the flexibility and the reliability of PW service protection, has saved cost, has increased benefit.

Description of drawings

Fig. 1 utilizes the PSN tunnel remaining bandwidth to carry out PW service protection flow chart;

Fig. 2 be embedded MPLS multi-service transport platform (MSTP: device network topological diagram Multi-Service TransportPlatform):

Fig. 3 is a network PSN tunnel schematic diagram:

Fig. 4 is remaining bandwidth database data structure figure:

Fig. 5 is the professional figure of PW1:

Fig. 6 is a logic LSP data structure diagram.

Embodiment

Be elaborated below in conjunction with the guard method of the drawings and specific embodiments to a kind of pseudo-line service of the present invention.

Fig. 1 utilizes the PSN tunnel remaining bandwidth to carry out PW service protection flow chart.

Fig. 2 is the MSTP device network topological diagram of embedded MPLS, and this network is the network topology structure that is connected to form by the MSTP equipment utilization SDH (Synchronous Digital Hierarchy) of a plurality of embedded MPLS technology (SDH, Synchronous Digital Hierarchy).

Fig. 3 is a network PSN tunnel schematic diagram.

Be described below in conjunction with Fig. 1,2 and 3 pairs of methods of the present invention, wherein:

Step 101 is set up the PSN tunnel remaining bandwidth database between the A point and G point in the network, the PSN tunnel bandwidth between 2 of record A, the G.PSN tunnel remaining bandwidth data of database structure as shown in Figure 4, the PSN tunnel bandwidth information between 2 of the A of record, the G is as shown in table 1 below;

Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth
Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth	A	G	48	53M	0
92	18M	0					48	53M	0
92	18M	0	1002	24M			0
34	64M	0	1002	24M			0

Remaining bandwidth data record between table 1A, G

Step 102, PW1 is the pseudo-line service that needs protection, and obtains the service bandwidth parameter of PW1.Fig. 5 is the pseudo-line service figure of PW1, and its bandwidth is 70M.

Step 103 is found out the PSN tunnel combination of satisfying the PW1 business demand, forms the logical PSN tunnel.The logical PSN tunnel of forming adopts data structure records as shown in Figure 6.The logical PSN tunneling data record of finishing after searching is as shown in table 2 below, and the record of remaining bandwidth database is as shown in table 3.

Source node	Destination node	Logic LSPID	Logic LSP bandwidth	LSP ID	Remaining bandwidth
Source node	Destination node	Logic LSPID	Logic LSP bandwidth	LSP ID	Remaining bandwidth	A	G
	1	70M	34	64M
			34	64M	92			6M

Table 2 satisfies the data record of the logic LSP of PW1 business

Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth
Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth	A	G	48	53M	0
92	18M	6					48	53M	0
92	18M	6	1002	24M			0
34	64M	64	1002	24M			0

Table 3 is found out the remaining bandwidth data record between A, G behind the logic LSP

Step 104, to the protected mode of PW1 employing LSP 1+1, with the protection passage of LSP (ID=1) as the PW1 business, the datum plane transmitting terminal sends business to protection passage LSP (ID=1) when the passage to the PW1 service integration sends business;

Step 105, receiving terminal judge whether protected passage breaks down.

Step 106 when protected passage breaks down, is switched to the PW1 business on the logic LSP (ID=1) from present multiplexing PSN.

Step 107, when having a new PW2 business (bandwidth demand 70M) need be multiplexed on the LSP (ID=92), logic LSP originally (ID=1) can not satisfy the bandwidth demand of PW1 business, and the remaining bandwidth data-base recording is as shown in table 4 below:

Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth
Source node	Destination node	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth	A	G	48	53M	0
92	3M	0					48	53M	0
92	3M	0	1002	24M			0
34	64M	64	1002	24M			0

Remaining bandwidth data record when table 4 has new business to insert between A, G

Step 108 utilizes best-fit to find out the LSP of new needs once more, forms new logic LSP and replaces.The record that the data structure of new logic LSP is as shown in table 5 below, form the remaining bandwidth database behind the new logic LSP is as shown in table 6 below:

Source node	Destination node	Logic LSPID	LSP ID	Remaining bandwidth
Source node	Destination node	Logic LSPID	LSP ID	Remaining bandwidth	A	G
	1	34	64M
		34	64M	1002			6M

After inserting, table 5 new business satisfies the data record of the logic LSP of PW1 business

Source node I	Purpose	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth
Source node I	Purpose	LSP ID	The LSP remaining bandwidth	By logic LSP occupied bandwidth	A	G	48	53M	0
92	3M	0					48	53M	0
92	3M	0	1002	24M			6
34	64M	64	1002	24M			6

Table 6 new business inserts the remaining bandwidth data record between back A, G

Certainly; the present invention also can have other multiple enforcements; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can be according to the present invention; make various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1. pseudo-line service guard method utilizes many packet network tunnel remaining bandwidths that pseudo-line service is protected, and it is characterized in that, may further comprise the steps:

2. the method for claim 1 is characterized in that: the tunnel bandwidth of packet network described in the step a) uses the information content to comprise source node, destination node, identifier, the remaining bandwidth in packet network tunnel and the bandwidth that is taken by logic packet network tunnel.

3. the method for claim 1 is characterized in that: in the step d), if can not find new bandwidth combination, then insert new business, abandon protecting passage; Or abandon inserting new business, keep the protection passage.

4. the method for claim 1 is characterized in that: if the multiplexing former packet network tunnel restoration of pseudo-line service is then returned switching services to former passage, or switching services do not gone back to former tunnel.