CN101043386A - Method for notifying pseudo-lines fault based on bidirectional transmission detecting protocol - Google Patents
Method for notifying pseudo-lines fault based on bidirectional transmission detecting protocol Download PDFInfo
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- CN101043386A CN101043386A CNA2006100614013A CN200610061401A CN101043386A CN 101043386 A CN101043386 A CN 101043386A CN A2006100614013 A CNA2006100614013 A CN A2006100614013A CN 200610061401 A CN200610061401 A CN 200610061401A CN 101043386 A CN101043386 A CN 101043386A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
The disclosed method for detecting the fault of protocol-notification pseudo-wire (PW) based on bi-directional transmitting comprises: the service provider edge router (PE) runs the BFD with other PE to detect the network fault; when there is fault between the first PE and the first CE, the BFD notifies the PW fault message to a remote PE by fault notification message; if multiple CEs connected with one PE fail, the PE packs multiple PW fault message in the fault notification message. This invention saves bandwidth efficiently.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of method based on the bidirectional transmission detecting protocol notifying pseudo-lines fault.
Background technology
Virtual private network (Virtual Private Network) is to rely on ISP of ISP (Internet Service Provider) and Internet Service Provider NSP (Network ServiceProvider), sets up the technology of private data communication network in public network.By realizing that level is divided into two-layer VPN (L2VPN) and three-layer VPN (L3VPN) etc.
L2VPN provides the two-layer VPN service based on PSN (Packet Switched Network) network (generally being the MPLS network), make operator that the two-layer VPN of different medium can be provided on unified PSN network, comprise ATM, FR, VLAN, Ethernet, PPP etc.
The present invention is an example with the MPLS network, and MPLS L2VPN is exactly a transparent transmission user Layer 2 data on the MPLS network.From user's angle, the MPLS network is two layers of switching network, can set up two layers of connection between different nodes.MPLS L2VPN networking schematic diagram as shown in Figure 1, (Virtual Circuit's virtual circuit of each customer edge (CE) configuration VC), links to each other with far-end CE by the MPLS network.The MPLSL2VPN model is made up of three parts: CE, PE and P.
CE (Customer Edge): user network boundary device has interface directly to link to each other with service provider SP (Service Provider) network.CE can be router or switch, also can be a main frame.Generally, CE " perception " does not need to support MPLS less than the existence of VPN yet.
PE (Provider Edge): service provider edge router is the edge device of service provider network, directly links to each other with CE.In the MPLS network, all processing of VPN are all occurred on the PE.
P (Provider): the P in the service provider network does not directly link to each other with CE.The P device just will possess basic MPLS transfer capability, does not safeguard VPN information.
Among Fig. 1, VC (Virtual Circuit): virtual circuit.A kind of unidirectional logic between two nodes connects.A pseudo-line PW is made up of a pair of reverse VC.Wherein, pseudo-line PW (Pseudo-Wire) is the virtual connection between two PE, transmission frame between two PE.Set up and safeguard that the work of PW utilizes signaling to finish by PE, and safeguard the state information of PW by two end points PE of PW.
L2VPN realizes the transparent transmission of user's message in the MPLS network by label stack:
Ground floor (skin) label exchanges in backbone network inside, the LSP of indication from PE to opposite end PE.The VPN message utilizes this layer label, can arrive opposite end PE along LSP;
The second layer (internal layer) label is called the PW label in MPLS L2VPN, using when opposite end PE arrives CE, and which Site the indication message should be sent to, and perhaps arrives which CE.Opposite end PE can find the interface that E-Packets according to vpn label.Be used for distinguishing the difference connection of different VPN, which CE decision is transmitted to message to recipient PE according to the PW label.
Whether available BFD (two-way forwarding detection) be a kind of forward-path mechanism that is used between a pair of forwarding engine of fast detecting, it provides a kind of low expense, short sense cycle between two adjacent systems failure detection mechanism comprises the detection of interface, data link and forwarding engine self.
BFD can be used for detecting the fault of PSN, can also be used to detecting the fault of PW simultaneously.When PSN broke down, fault had taken place in PE notice CE, if CE can also arrive far-end CE by other paths, then CE can select other paths to E-Packet; When breaking down between PE and the CE, be example to break down between PE1 and the CE1, PE1 need notify far-end PE 2, and by far-end PE 2 notice CE2, far-end CE2 just can select other paths to E-Packet again.
Prior art is moved the fault that BFD detects PW between PE, still, when PE goes up PW when a lot, operation BFD has not only increased the weight of the burden that device forwards is handled on each PW, and because the BFD message needs constantly to send, also can take massive band width.
Summary of the invention
The technical problem that the present invention solves provides a kind of method based on the bidirectional transmission detecting protocol notifying pseudo-lines fault, effectively alleviates the forwarding burden of network, fast notifying pseudo-lines fault.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method based on the bidirectional transmission detecting protocol notifying pseudo-lines fault comprises step:
A. operation bidirectional transmission detecting protocol BFD between service provider edge router PE and the far-end PE detects network failure;
B. break down between described PE and the user network boundary device CE, described BFD announces the fault message of a plurality of pseudo-line PW of described CE to far-end PE by a fault notification message.
Wherein, if a plurality of CE that link to each other with described PE break down simultaneously, described PE carries the fault message of the PW of a plurality of CE simultaneously in described fault notification message.
Wherein, if when a fault notification message can't hold the fault message of all PW, then announce the fault message of the pseudo-line PW of described CE to far-end PE by a plurality of fault notification messages.
Wherein, comprise after the step B, after described far-end PE is received described fault notification message,, and stop forwarding data to the CE announcement fault that is connected with described far-end PE.
Wherein, if after the fault recovery between described PE and the described CE, described PE sends the fault recovery announcement by BFD to described far-end PE, after described far-end PE confirms that the other side receives message, then no longer sends the fault recovery announcement.
Wherein, step B directly sends a plurality of described failure notice message continuously, realizes fast to described far-end PE announcement fault.
Wherein, the described fault notification message of step B comprises the fault type field, the message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field, if the type of the pseudo-line of fault is identical, but pseudo-line ID is discontinuous, and the pseudo-line ID that breaks down is carried on respectively in the pseudo-line id field.
Wherein, the described fault notification message of step B comprises the fault type field, the message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field are if the type of the pseudo-line of fault is identical, and pseudo-line ID is continuous, the described pseudo-line amount field that described fault notification message then is set is first predetermined value, and the first pseudo-line id field is carried initial pseudo-line ID, and the second pseudo-line id field carrying stops pseudo-line ID.
Wherein, the described fault notification message of step B comprises the fault type field, the message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field if the type of the pseudo-line of fault is inequality, are carried the complete information of a plurality of pseudo-lines simultaneously in described fault notification message.
Because BFD is in the Forwarding plane operation of PE equipment, processing speed is very fast, therefore can satisfy the requirement of quick announcement fault.
Description of drawings
Fig. 1 is the networking structure schematic diagram of prior art;
Fig. 2 is the networking structure schematic diagram of the embodiment of the invention.
Embodiment
Move BFD among the present invention between PE and PE, BFD does not detect each PW, only detects packet switching network PSN.Therefore, between PE and PE, the quantity of the BFD of operation can not increase with the increase of PW.
When breaking down between PE and the CE, PE is by carrying the fault message of a plurality of PW, the fault between far-end PE announcement PE and CE in the BFD message.
As shown in Figure 2, two PE are arranged among Fig. 2, be respectively PE1 and PE2.PE1 has connected a plurality of CE, be designated as respectively CE1, CE2 ..., CEn.Move BFD between PE1 and the PE2.
Break down between PE1 and CE1, PE1 sends the fault notification of the PW of CE1 to far-end PE 2 by BFD.After confirming that according to BFD agreement regulation the other side receives message, then no longer send.
If break down simultaneously between a plurality of CE such as PE1 and CE1, CE2, then PE1 can carry the fault message of the PW of a plurality of CE simultaneously in the fault notification message.When a message can not comprise the information of all PW, then by a plurality of BFD message announcements of carrying the PW fault message.PE2 announces fault by prior protocols to the corresponding CE that PE2 connects, and stops forwarding data traffic after receiving fault notification.
After the fault recovery between PE1 and the CE1, PE1 sends the fault recovery announcement of the PW of CE1 to far-end PE 2 by BFD, confirm that according to BFD agreement regulation the other side receives message after, then no longer send the fault recovery announcement.
Embodiment one:
If the PW type is identical, if PW ID is discontinuous, BFD fault notification message format as shown in Table 1.Table one:
0 1 2 3
0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PW?Type | PW?Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PW?ID?1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PW?ID?2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| …… |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PW?ID?n |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Wherein,
Type represents it is that the PE of PW has fault to CE;
Length is the byte number of whole information;
PW Type is the PW Type that defines in the PWE3 agreement, comprise frame relay data link connection identifier (CID DLCI, Ethernet Tagged pattern, Ethernet, HDLC, PPP, ATM n to 1 VCC (Virtual Channel connection) cell transparent transmission, ATM n to 1VPC cell transparent transmission, 1 pair 1 VCC cell of ATM transparent transmission, 1 couple 1 VPC of ATM (virtual path connection) cell transparent transmission, frame relay port pattern etc.;
PW Number is the quantity of the PW that writes down below;
PW ID is used to write down the PW that breaks down.
Embodiment two:
For further compressed information, if PW is a same type,, can carry the fault message of the PW of a plurality of CE in the fault notification message simultaneously if PW ID is continuous, to far-end PE announcement fault, BFD fault notification message format is as shown in Table 2.
Table two:
0 1 2 3
0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1?2?3?4?5?6?7?8?9?0?1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| PW?Type | PW?Number＝0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| First?PW?ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| End?PW?ID |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Wherein,
PW Number field is set to particular value, and the expression back is the scope of PW ID, is example with PW Number=0.
An independent PW breaks down, and also can represent in this way, and End PW ID and First PW ID use the ID of this PW to get final product.
Among the embodiment one, if 2000 PW are arranged, PE is to CE simultaneous system fault: the message of one 1500 byte, remove the BFD essential information less than outside 100 bytes, each pseudo-line id field takies 4 bytes, then 1400 bytes can be deposited 348 PW, and 2000 PW only just can all send to far-end PE with 6 messages.
Among the embodiment two, if all PW types are identical, and fully continuously, then 2000 PW only use 16 bytes, and only 1 message just can all send to far-end PE.
If PW type difference, and discontinuous fully, 16 bytes of the informational needs of each PW are then carried the complete information of a plurality of pseudo-lines simultaneously in the fault notification message, comprise type, length, quantity and pseudo-line ID.1400 bytes can only be deposited 87 PW, and 2000 PW need just can all send to far-end PE with 23 messages.
Because embodiment one and embodiment two can use simultaneously, therefore, under the worst condition, 2000 PW need just can all send to far-end PE with 18 messages.
According to the needs that fault notification sends as early as possible, BFD can send at interval not according to the message of consulting when sending failure message, and the message amount that sends continuously is controlled at some, and as top example, limiting case can not surpass 100 messages.Therefore, BFD directly sends a plurality of messages, continuously to reach the purpose of quick fault notification when sending failure message.
Run through specification, the preferred embodiment that illustrates and example should be counted as example of the present invention and be unrestricted.
Claims (9)
1. the method based on the bidirectional transmission detecting protocol notifying pseudo-lines fault is characterized in that, comprises step:
A. operation bidirectional transmission detecting protocol BFD between service provider edge router PE and the far-end PE detects network failure;
B. break down between described PE and the user network boundary device CE, described BFD announces the fault message of a plurality of pseudo-line PW of described CE to far-end PE by a fault notification message.
2. method according to claim 1 is characterized in that, if a plurality of CE that link to each other with described PE break down simultaneously, described PE carries the fault message of the PW of a plurality of CE simultaneously in described fault notification message.
3. method according to claim 1 and 2 is characterized in that, if when a fault notification message can't hold the fault message of all PW, then announces the fault message of the pseudo-line PW of described CE to far-end PE by a plurality of fault notification messages.
4. method according to claim 1 is characterized in that, comprises after the step B, after described far-end PE is received described fault notification message, to the CE announcement fault that is connected with described far-end PE, and stops forwarding data.
5. method according to claim 1, it is characterized in that if after the fault recovery between described PE and the described CE, described PE sends the fault recovery announcement by BFD to described far-end PE, after described far-end PE confirms that the other side receives message, then no longer send the fault recovery announcement.
6. method according to claim 1 is characterized in that, step B directly sends a plurality of described failure notice message continuously, realizes fast to described far-end PE announcement fault.
7. according to any described method in the claim 1 to 6, it is characterized in that, the described fault notification message of step B comprises the fault type field, the message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field are if the type of the pseudo-line of fault is identical, but pseudo-line ID is discontinuous, and the pseudo-line ID that breaks down is carried on respectively in the pseudo-line id field.
8. according to any described method in the claim 1 to 6, it is characterized in that, the described fault notification message of step B comprises the fault type field, message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field, if the type of the pseudo-line of fault is identical, and pseudo-line ID is continuous, and the described pseudo-line amount field that described fault notification message then is set is first predetermined value, the first pseudo-line id field is carried initial pseudo-line ID, and the second pseudo-line id field carrying stops pseudo-line ID.
9. according to any described method in the claim 1 to 6, it is characterized in that, the described fault notification message of step B comprises the fault type field, the message length field, pseudo-line type field, pseudo-line amount field and pseudo-line id field if the type of the pseudo-line of fault is inequality, are carried the complete information of a plurality of pseudo-lines simultaneously in described fault notification message.
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| CNB2006100614013A CN100459531C (en) | 2006-06-28 | 2006-06-28 | Method for notifying pseudo-lines fault based on bidirectional transmission detecting protocol |
| PCT/CN2007/001623 WO2008003213A1 (en) | 2006-06-28 | 2007-05-18 | A method of informing failure information based on bi-directional forwarding detection protocol and device |
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| CNB2006100614013A CN100459531C (en) | 2006-06-28 | 2006-06-28 | Method for notifying pseudo-lines fault based on bidirectional transmission detecting protocol |
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| CN101043386A true CN101043386A (en) | 2007-09-26 |
| CN100459531C CN100459531C (en) | 2009-02-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101141330B (en) * | 2007-10-23 | 2010-06-16 | 华为技术有限公司 | Method, system and equipment to establish BFD detection for LSP tunnel |
| CN101267360B (en) * | 2008-04-10 | 2010-08-18 | 华为技术有限公司 | Pseudo failure detection method and user boundary device |
| CN101826983A (en) * | 2010-04-02 | 2010-09-08 | 中兴通讯股份有限公司 | Dual-homing protection switching method, device and system |
| CN101834773A (en) * | 2010-03-30 | 2010-09-15 | 中兴通讯股份有限公司 | Protection method and system of virtual private LAN (Local Area Network) service (VPLS) |
| CN101909006A (en) * | 2010-07-23 | 2010-12-08 | 北京星网锐捷网络技术有限公司 | BFD (Bidirectional Forwarding Detection) message sending and receiving methods as well as device and communication system thereof |
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| US7164652B2 (en) * | 2001-12-17 | 2007-01-16 | Alcatel Canada Inc. | System and method for detecting failures and re-routing connections in a communication network |
| DE60313480T2 (en) * | 2002-09-13 | 2007-08-09 | Nortel Networks Ltd., St. Laurent | GENERAL LAYER-2 VPN |
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- 2006-06-28 CN CNB2006100614013A patent/CN100459531C/en not_active Expired - Fee Related
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| CN108809792A (en) * | 2017-04-26 | 2018-11-13 | 中兴通讯股份有限公司 | A kind of method and device of message data control |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2008003213A1 (en) | 2008-01-10 |
| CN100459531C (en) | 2009-02-04 |
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