WO2007009347A1 - A method and apparatus for transmitting service stream on a virtual interchange system - Google Patents

A method and apparatus for transmitting service stream on a virtual interchange system Download PDF

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Publication number
WO2007009347A1
WO2007009347A1 PCT/CN2006/001593 CN2006001593W WO2007009347A1 WO 2007009347 A1 WO2007009347 A1 WO 2007009347A1 CN 2006001593 W CN2006001593 W CN 2006001593W WO 2007009347 A1 WO2007009347 A1 WO 2007009347A1
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WO
WIPO (PCT)
Prior art keywords
path
dre
backup
transmission
transmitting
Prior art date
Application number
PCT/CN2006/001593
Other languages
French (fr)
Chinese (zh)
Inventor
Xiaojun Duan
Lingyuan Fan
Yuepeng Chen
Dengchao Wu
Meng Ke
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN 200510083966 priority Critical patent/CN100486216C/en
Priority to CN200510083966.7 priority
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007009347A1 publication Critical patent/WO2007009347A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/22Alternate routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/02Topology update or discovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/28Route fault recovery

Abstract

A method and apparatus for improving transmission reliability of virtual interchange system. Its key point is as follows: when selecting service stream path, the connection controlling layer selects more than two transmission paths simultaneously for the service stream and determines the primary path; once the primary path is in failure condition, the bearing ability layer can switch service stream to the alternate path automatically, thus failure restoring ability of the bearing ability layer of V-Switch is achieved. The invention reduces risk of service interruption, improves reliability of private line service, and enhances stability of network running. The invention applies to network of any size, tends to realization ,maintenance and management.

Description

Transmission switching system for a virtual traffic flow and methods Technical Field The present invention relates to network communication technology, and particularly relates to a method and an apparatus for transmitting traffic in a virtual switching system stream.

BACKGROUND With the increasing size of the Internet, a variety of network services competing to emerge, advanced multimedia system after another. Since multimedia services take up a lot of bandwidth, the existing network to ensure that critical business it is difficult to get reliable transmission. Thus, various QoS (Quality of Service) technology came into being. Portal-based applications and services as well as a variety of broadband multimedia services, including providing rich Video (video) / Audio (audio) streams, VOD (video on demand), video multicast, interactive multimedia, high-bandwidth network requirements for the average residential user games; video conferencing for business users, remote education, VPN (virtual private network), with QoS guaranteed data lines, etc., has become an important part of the broadband operations.

In response to these business users, proposed V-Switch (V-Switch), L2TP (Layer Two Tunneling Protocol), MPLS (Multiprotocol Label Switching) and other means of VPN / VPDN (virtual private network dial-up) Line program. V-Switch technology which is mainly used in the formation of stable, practical, economical carrier-grade Metro Ethernet, to ensure QoS can be achieved, network security, carrier-grade network maintenance and management functions, with the number of user-based management, certain mobility, open business management billing centralized management of core business management capabilities, including providing intelligent Layer 2 traffic scheduling, LAN (Local Area network) leased line, IP traffic planning and business services, it appears to fill the current network in Junji lack of ability level.

V-Switch system shown in Figure 1 is divided into three layers: V-Switch service control layer, the control layer is connected V-Switch, bearer capability layer V-Switch. Service control layer to complete the registration service control line V-Switch and the like; DRE for maintaining the connection control layer (physical data transfer) exchanged resources, including equipment, ports, links, the VLAN (Virtual LAN), to accept the service control layer SCR (service control register) of the V-Switch request to establish a connection path for the traffic flow selected V-Switch, the allocated bandwidth and VLAN (virtual Local Area Network) resources, and the control information is sent to the traffic flow through the DRE device; DRE layer carrying capacity is only according to the VLAN switching table entry Gen connection control layer is provided, to complete the forwarding of traffic in the Ethernet frame format. VLAN switching table entry as follows:

DRE to exchange VLAN traffic flow forwarding table as a route basis. Service data forwarding process described below: a VLAN port 1 of the ID1 received Ethernet frame to the port 2 while a conversion into the VLAN ID of the VLAN ID 2; and the port VLAN ID 2 received Meanwhile Ethernet frame 2 is transmitted to port 1 is converted into the VLAN ID2 IDl the VLAN. In this form, the entire network can establish a virtual channel of the VLAN, the virtual channel is described as:

[Device 1, port 1, VLAN ID is 1] [1 apparatus, port 2, VLAN ID of 2] [device 2, port 3, VLAN ID of 2] [device 2, port 1, VLAN of ID 3] ...... .

Forwarding said service data carrying capacity of the layer itself is not fault recovery mechanism, once a physical link failure between the bearer capability layer DRE, V-Switch Line services will be removed, i.e. when the carrier layer capacity of the virtual channel state detected failure when the connection is closed, dry place all affected resources, which will lead to business interruption, and reduces the reliability of private line service.

SUMMARY

The present invention provides a method and apparatus for transmitting traffic stream virtual switching system, the virtual switching system to improve the reliability of transmission.

Aspect of the present invention comprises: a method switching system virtual traffic flow transmission, comprising:

Data to the carrying capacity of the lower layer transmission path equivalent traffic stream is two or more than two, determines the primary path, the alternate path including the main information to the connection control layer entity forwards the message path selection DRE;

DRE select the active path transmitting traffic stream.

The equivalent of the transmission path for the service flow process:

The connection control layer preferentially select a different path as the DRE sequence equivalent transmission path, followed by selecting the same sequence but different physical links DRE path as the transmission path equivalent.

Under the development process selection message path comprises: a connection control layer VSC will send the path information DRE the form of a map of the command stream.

The process of determining the primary path comprises:

The connection control layer after several paths according to the path determined how much the DRE priority, after a few specified DRE shortest path with the main path, the remainder of the backup path.

The method further comprising: after determining the number of how many DRE backup path according to the priority, after a small number of backup paths DRE relatively high priority.

The method further comprising: the virtual switching system, the service transmission for the active path and the backup path failure detection were performed; when it is determined by the primary path fails, backup and normal path, the traffic is switched to the backup transmission path.

The switching from the active path to the backup path process is no fault in the backup path to the selected highest priority backup path switched according to the priority of the backup path.

The path switching process is initiated by the end to end DRE transmitting traffic flow control layer and the transparent connection.

The method further comprises: when the active path and the backup path failure when normal, is not switched bearer service, just record the backup path failure occurs.

Switching system for a virtual traffic flow transmission apparatus, comprising: a transmission path control layer connected to the data selection module, and carrying capacity DRE layer forwarding entity, wherein

Data to the carrying capacity of the lower layer of the transmission path selecting means for selecting a transmission path equivalent to two or more than two traffic flows, to determine the primary path, the alternate path comprising a main path selection information message forwarding entity DRE ; DRE selecting the active path transmitting traffic stream.

The apparatus further comprising: a link failure detection module, and a path switching module, wherein said link fault detection module for the virtual switching system, on the active path and backup service transmission path are detected fault; in when the primary path failure is determined and the normal backup path, the path switching module performs switching notification operation; when determining the master path and the normal backup path failure is not switched bearer service, only the recording of the backup path fails;

The path switching module for switching the received notification, the traffic is switched to the backup path.

The equivalent of the transmission path for the service flow process:

The connection control layer preferentially select a different path as the DRE sequence equivalent transmission path, followed by selecting the same sequence but different physical links DRE path as the transmission path equivalent.

Provided by the present invention of the above it can be seen that the present invention includes a bearer capability layer failure recovery, when a physical link between the DRE on the main path fails, the backup path using a fast switching mechanism to service the backup path, improve the reliability of the virtual switching system, transmission, reducing the reliability of green business interruption risk, improve the green business, and enhance the stability of the network running. The present invention is applicable to networks of any size, easy to implement, manage and maintain.

BRIEF DESCRIPTION

Figure 1 is a prior art schematic V-Switch architecture;

Figure 2 is a schematic diagram of a backup path carrying capability layer embodiment of the present invention;

FIG 3 is a flowchart of an embodiment of a virtual switching system of the present invention is a backup path. DETAILED DESCRIPTION The core idea of ​​the present invention are: the connection control layer when selecting traffic flow path while selecting a transmission path for two or more traffic flows, and to determine one of the main path with the rest of the backup path, once the primary path failure, traffic can be automatically switched from the flow carrying capacity of the carrier layer up to the backup path, the failure to achieve V-switch carrying capacity recovery layer.

Figure 2 shows a backup path according to a bearer capability layer embodiment of the present invention, a schematic embodiment, FIG. 3 is a flowchart illustrating operation of an embodiment of a backup path, according to an embodiment below with reference to FIGS. 2 and 3 of the present invention is a: a 3

Service flow transmission process will be described.

2, 3 V-Switch system embodiment includes a service control layer, the control layer and the bearer connection capability layer, wherein the service control layer, and the connection control layer may be a physical entity, or may be two separate physical entities . Representative above three entities are named SCR (V-Switch service control entity), VSC (V-Switch connection control entity), DRE. The virtual switching system, a method for transmitting traffic flow comprises:

Step 10: VSC select two or more than two equivalent paths service flow;

The presence of one or more links between the two layers DRE carrying capacity, carrying at least one line V-Switch Line service in each link, each channel V-Switch Line services distinguished by a particular connection identifier, each path V -Switch line may carry traffic data, carrying capability layer before sending data, the first selected path control layer connection VSC, VSC in the choice of the path, if it is the case of cross-domain, needs to assist together with other VSC path selection, the final simultaneously select two or more than two equivalent paths as service stream, and sent to the lower layer forms the carrying capacity of the flow mapping command, the data flow carrying capability layer ^^ mapping information for identifying traffic flow and bypass, and according to the following issued bearer path. Mutual backup path between the equivalent relationship, and the path of each node and each link DRE same situation can not occur between any two equivalent paths. Thus, to ensure first DRE sequence on different possible different paths followed by the same DRE should ensure that different links between the DRE. The specific method is to select a free VSC each DRE same routing process in the path followed by the same can not be avoided if DRE, it should choose different links between the same DRE, for example, in FIG. 2 E and link F that two different links; i.e. prioritizes different path DRE sequence, followed by selecting the same sequence but different physical links DRE paths, but not the entire end link two paths appear coincident.

With the above principles can be realized in both cases the fault recovery methods: The first is that when a DRE failure on the active path, can be switched to the backup path does not pass through the DRE up; the second is no fault if DRE , However, when a link failure on the DRE, the carrier may be switched to the backup link DRE other, if there is no backup link is available and can be switched to the backup path does not pass through the DRE up.

For example, referring to Figure 2, the connection control layer is assumed that the user terminal 1 (UE1) to a line between the traffic flow path selection UE2, according to the above principles can be routed simultaneously to-end and two between the initial and end DRE 1 DRE6 more than one path, for example where two paths, the first link is ^ D, F, H and a total of four head to tail composed of a path of traffic flow through the DRE sequence: <DRE1, DRE2, DRE4, DRE5 , DRE6>; a second link path a, C, E, G, K, L and total six consisting of head to tail, the traffic flow through the DRE sequence: <DRE1, DRE3 DRE4, DRE5, DRE7 , DRE8, DRE6>.

Step 11: determining a priority of said selected path;

After selecting the route, determining a priority of the path; number according to the number of passes DRE path, i.e. the path length and other factors to determine the priority of the path; send routing message when in the connected control layer, a specified number of small DRE , i.e. the shortest path with the main path, the remainder of the backup path; wherein the backup path in the backup path can be similarly determined based on the number of elapsed number of factors such as the priority of the DRE, a small number of backup paths DRE relatively high priority, i.e., shortest path first the principle of the above examples may be determined first path priority than the priority of the second path.

Step 12: Send the message to the selected path carrying capability layer;

VSC will send the route information through the flow mapping command of the form of each of DRE, the stream mapping command includes a session ID, stream information, quality of service Qos parameters, flow descriptor and the port name of the DRE, a VLAN of the ID, the port name, the ID VLAN's. VSC issued when specified path of the first path with the path-oriented, because the number of paths through which the DRE is less than the second, relatively short path, the second backup path, the connection control layer issued the message path selection DRE carrying capacity to the respective layers, to ensure that the service flow may be used to carry two paths. In this case, the traffic flow between UE1 and UE2 is only carried on the first path.

Step 13: detecting a link failure, switching the bearer path when the primary path fails;

DRE first and last on the route periodically to-end link detection message, two end to end 2 two paths FIG DRE: DRE 1 and DRE6 necessary to periodically detect the full access path where, if there is local link failure, link failure on any one of two paths, once, the first and last link DRE can be automatically detected, and the failure information of the link in real time to notify the surrounding DRE. For detecting a link failure in the industry to have a variety of implementations, set forth which are not the focus of the present invention, the present invention does not described in detail.

If the primary path fails, the backup path is normal, then the primary (first bar) over to the backup path (second) up path, the backup path after a successful handover becomes the active path, the active path before the switching occurs becomes the backup path, when a plurality of backup paths to select the optimal backup path according to the priority of the backup path switched, i.e. a high priority selected backup path switched, the path switching process is initiated by the end-DRE switching over the connection control layer is transparent, the connection control layer does not interfere; if the master path and the normal backup path failure, only the backup path failure occurs is recorded without switching the bearer service; when it is determined by the primary path failure If there is no normal backup path, green demolition. Thus understood, the connection control layer in the selected path message sent, specifies the VSC master path when the primary backup relationship is absolute, but issued VSC initial active path fails, switching to the backup path, which after the active path and the backup path are opposite, i.e., the main current path of the bearer services used, it may not be the shortest path, and the other as a backup path may shortest path. The process of switching the connection path control layer may be transparent, connection control layer may not be notified, but may also be notified of an event control layer is connected to the connection control layer and a service control layer to make a strategy adjustment.

In summary, the present invention achieves a V-Switch failure recovery function, using the connection control when the routing layer simultaneously select more than two paths and delivers it to the carrier capability layer, capability layer carrying path through the selected level of priority high priority bearer path, and the carrying capacity of the link layer by detection of a link failure, link failure caused upon the active path fails, traffic is switched to continue to carry put the highest priority on the backup path, so accelerated Line speed recovery, reduce the risk of green business interruption, failure to improve the V-Switch Line of business resilience, and the backup path technology is applicable to networks of any size, easy to implement, manage and maintain.

The present invention also provides a switching system in a virtual traffic flow transmission apparatus, comprising: a transmission path control layer connected to the data selection module and carrying capacity layer forwarding entity DRE.

Data to the layer carrying capacity under the above transmission path selecting means for selecting a traffic flow two or more than two equivalent transmission path, determining the active path, the alternate path comprising a main path selection information message forwarding entity DRE. Transmission path equivalent traffic stream selection procedure is as follows: the connection control layer preferentially select a different path as the DRE sequence equivalent transmission path, followed by selecting the same sequence but different physical links DRE path as the transmission path equivalent.

Above the active path selection DRE transmitting traffic stream.

Apparatus of the present invention further comprises: a link failure detection module, and a path switching module, wherein 001 593

-8-- link failure detection module for the virtual switching system, on the active path and backup service transmission path are detected fault; when determining the primary path fails and the normal backup path, the path switching execution notification module switching operation; when determining the master path and the normal backup path failure is not switched bearer service, only the recording of the backup path fails.

A path switching module for switching the received notification, the traffic is switched to the backup path.

As the main method of determining an alternate path, determining the priority of the primary backup path, the path switching process and the like, the process of the previous method is exactly the same portion will not be repeated here.

Above, the present invention is merely preferred specific embodiments, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought of the changes or Alternatively, it shall fall within the protection scope of the present invention. Accordingly, the scope of the present invention should be defined by the scope of the claims.

Claims

Rights request
1. A method for transmitting the virtual switching system traffic flow, characterized by comprising: a connection control layer service flow equivalent selecting two or more than two transmission paths, determining the active path, the alternate path including the main information routing the message data sent to the bearer capability layer forwarding entity DRE;
DRE select the active path transmitting traffic stream.
2. The switching system of claim 1 virtual transmission method of claim traffic flow, wherein the service flow transmission path selection process is equivalent to:
The connection control layer preferentially select a different path as the DRE sequence equivalent transmission path, followed by selecting the same sequence but different physical links DRE path as the transmission path equivalent.
3. The system of claim 1 Virtual Switching method for transmitting a traffic flow claim, wherein the development process of the path selection message comprises:
Connected by the connection control layer entity V-Switch Control VSC path information sent by DRE the form of a map command stream.
4. The system of claim 1 Virtual Switching method for transmitting a traffic flow claim, wherein said primary path determination process comprising:
The connection control layer after several paths according to the path determined how much the DRE priority, after a few specified DRE shortest path with the main path, the remainder of the backup path.
5, the virtual switching system as claimed in claim 4 in a method for transmitting a traffic flow, characterized in that, the method further comprising: the number of elapsed number of backup paths DRE determined priority, after a small number of backup path priority DRE Relatively high.
6 as claimed in any one of claims 1 to 5, the virtual switching system transmitting service flow process as claimed in claim, wherein the method further comprises:
In the virtual switching system, on the active path and backup path for traffic transmission are for fault detection;
When it is determined by the primary path fails, backup and normal path, the traffic is switched to the backup path for transmission.
7, the virtual switching system as claimed in claim 6 in a method for transmitting a traffic flow, characterized in that the switching from the main path to the backup path with the process, no fault in the backup path according to the priority of the backup paths select the highest priority backup path switched.
8, the virtual switching system as claimed in claim 6 or 7, a method for transmitting a traffic flow, characterized in that, the path switching process is initiated by the end to end DRE transmitting traffic flow control layer and the transparent connection.
9. The system of claim 6 Virtual Switching method for transmitting a traffic flow claim, wherein the method further comprises:
When the active path and the backup path failure when normal, is not switched bearer service, just record the backup path failure occurs.
10. A device for transmitting the virtual switching system, traffic flow, characterized by comprising: a transmission path control layer connection data selection module, and carrying capacity DRE layer forwarding entity, wherein said transmission path selection module, for the traffic stream is equivalent to two or more than two transmission paths, determining the active path, the alternate path comprising a main path selection information is sent to the message data bearer capability layer forwarding entity DRE;
The active path selection DRE transmitting traffic stream.
11. The system of claim 10 virtual switching apparatus of claim transmitting traffic stream, wherein the apparatus further comprises: a link failure detection module, and a path switching module, wherein said link fault detection module for in the virtual switching system, on the active path and the backup path for traffic transmission are for fault detection; when determining the primary path fails and the backup path is normal, notifies the path switching module performs switching operation; determining master path normal and backup when the path failure, is not switched bearer service, only the recording of the backup path fails;
The path switching module for switching the received notification, the traffic is switched to the backup path.
12. The system of claim 10 virtual switching apparatus as claimed in claim transmitting traffic stream, wherein the service flow transmission path selection process is equivalent to:
The connection control layer preferentially select a different path as the DRE sequence equivalent transmission path, followed by selecting the same sequence but different physical links DRE path as the transmission path equivalent.
PCT/CN2006/001593 2005-07-15 2006-07-06 A method and apparatus for transmitting service stream on a virtual interchange system WO2007009347A1 (en)

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CN200510083966.7 2005-07-15

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