WO2009046644A1

WO2009046644A1 - A method and device for traffic flow switching

Info

Publication number: WO2009046644A1
Application number: PCT/CN2008/071478
Authority: WO
Inventors: Hong Lv
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-10-09
Filing date: 2008-06-28
Publication date: 2009-04-16
Also published as: CN101159669A

Abstract

A method and device for traffic flow switching are disclosed. The method includes: detecting the link quality of a main link and of a standby link corresponding to the main link, and switching the traffic flow of the main link to the standby link when the link quality parameter of the main link is greater than or equal to a preset threshold, and when the link quality parameter of the standby link is less than said preset threshold. The invention thus provides the advantage of switching traffic flow according to link quality, thus ensuring normal traffic transmission, and improving network reliability.

Description

Service flow switching method and device

Technical field

The embodiments of the present invention relate to the field of network technologies, and in particular, to a service flow switching method and apparatus. Background technique

Usually, there are multiple routes to the same destination, which can be equivalent or non-equivalent. When an equal-cost route exists, packets are forwarded in load balancing mode, and traffic can be adjusted through the weight of each route. In the non-equivalent case, the optimal route is forwarded. When the optimal route is faulty, the device selects an optimal route from the remaining routes and forwards the most from the remaining routes. The optimal route is equivalent to the original sub-optimal route.

Routes in the routing table are usually generated by routing protocols, and routing protocols usually choose paths based on the hop count of the link and the static bandwidth of the physical link. As shown in Figure 1, when the route to device F is generated on device B, the bandwidth of the link BCE is 300M, and the bandwidth of the link BDE is 200M. Therefore, the BCE link is selected as the primary link. The road is an alternate link. If the bearer network is a Multi-protocol Label Switching (MPLS) network, the link with a larger bandwidth is preferred as the primary link. If the bearer network is a media access control tunnel (MAC IN MAC) network, most of them are manually configured routes. It is also preferred to use a link with a larger bandwidth as the primary link.

The MPLS technology is widely used on the backbone network. The basic component of the MPLS network is the Label Switching Router (LSR). The LSR located at the edge of the MPLS network and connected to other user networks is called the edge LSR. Router (LER, Label Edge Router) The LSR inside the MPLS network is called the core LSR. The LSRs inside the MPLS network use MPLS signaling to communicate. At the edge of the MPLS network, the LER and the traditional Internet protocol (IP, Internet) Protocol) technology to adapt. In the MPLS network, a tunnel is set up from the ingress LER (ie, the ingress) to the egress LER (ie, the egress), which is an LSP (Label Switched Path). Message.

Similarly, there may be multiple LSPs arriving at the same destination, either equivalent or non-equivalent. When an equal-cost LSP exists, the packets are forwarded in load balancing mode. The traffic distribution of the LSP can be adjusted by adjusting the weight of each LSP. In the non-equivalent case, the optimal LSP is forwarded. After the optimal LSP fails, the router selects an optimal LSP from the remaining LSPs, and selects the selected one from the remaining LSPs. The optimal LSP is equivalent to the original sub-optimal LSP.

MAC IN MAC is an Ethernet-based tunneling technology. It directly encapsulates the received Layer 2 Ethernet packets into the backbone network by directly encapsulating the MAC address of the backbone network. After the edge node removes the backbone MAC address, it transmits it according to the MAC address of the user. .

Similarly, there can be multiple MAC IN MAC tunnels to the same destination, either equivalent or non-equivalent. When there is an equal-cost tunnel, it is forwarded by load balancing, and the weight of each tunnel can be adjusted to adjust the traffic distribution of the tunnel. In the non-equivalent case, the optimal tunnel forwarding packet is selected. When the optimal tunnel fails, an optimal tunnel forwarding packet is selected from the remaining tunnels, and the most selected one from the remaining tunnels is selected. The excellent tunnel is equivalent to the original sub-optimal MAC IN MAC tunnel.

In carrying out the process of the present invention, the inventors have found that the prior art has at least the following problems:

The way to route through the hop count and bandwidth of the link is static, without considering the actual link quality, and in some cases there are drawbacks. For example, two paths, one bandwidth is 300M, and the other is 200M. However, the quality of the 300M link is not good, and packet loss occurs, resulting in frequent message retransmission. According to the prior art mechanism, as long as the link does not fail, the link is selected to transmit the service. Therefore, repeated retransmission of the message will not only increase the link load, but also the retransmission process may cause the service to be intermittent, so it will affect the service.

Currently, in order to detect link faults, bidirectional forwarding detection (BFD)/MPLS operation, management, and maintenance (OAM, Operation, Administration, and Maintenance, Ethernet operation, management, and maintenance (OAM) detect links/tunnels so that link faults can be quickly detected. However, the BFD/MPLS OAM/Ethernet OAM mechanism can only detect whether the link is faulty or not, and does not sense the quality of the link. It can receive the other party's packet even in a fixed period, even if the packet loss rate is high. , it will not be considered that the link is faulty, and no traffic will be switched.

Summary of the invention

The embodiment of the invention provides a service flow switching method and device, which is used for switching service traffic according to link quality, ensuring normal transmission of services, and improving network reliability.

The method provided by the embodiment of the present invention includes:

Detecting a link quality of the primary link and the backup link corresponding to the primary link; and detecting that the link quality parameter of the primary link is greater than or equal to a preset threshold, and the standby chain When the link quality parameter of the path is less than the preset threshold, the traffic on the primary link is switched to the standby link.

The device provided by the embodiment of the present invention includes: a link quality detecting unit and a traffic switching unit;

The link quality detecting unit is configured to: when a link quality parameter of the primary link is greater than or equal to a preset threshold, and a link quality parameter of the standby link corresponding to the primary link is smaller than the foregoing When the threshold value is set, the flow switching unit is triggered;

The traffic switching unit is configured to switch service traffic on the primary link to the standby link according to triggering by the link quality detecting unit.

Compared with the prior art, the embodiment of the invention has the following advantages:

When the link quality parameter of the primary link is greater than or equal to a preset threshold, and the link quality parameter of the standby link is less than the preset threshold, the service traffic on the primary link is switched to On the standby link, the normal transmission of the service is ensured, and the reliability of the network is improved. DRAWINGS

1 is a schematic diagram of a network link in the prior art;

2 is a schematic diagram of an IP network link provided in a specific embodiment of the present invention; FIG. 3 is a schematic flowchart of a method according to an embodiment of the present invention;

4 is a schematic diagram of an MPLS network link provided in a specific embodiment of the present invention; FIG. 5 is a schematic flowchart of a method according to an embodiment of the present invention;

6 is a schematic diagram of a MAC IN MAC network link provided in a specific embodiment of the present invention;

FIG. 7 is a schematic flowchart of a method according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a method according to a general embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a device according to an embodiment of the present invention. detailed description

The embodiment of the invention provides a service flow switching method and device. By detecting the quality of the link, including the delay, jitter, and packet loss rate, the quality of the active link is discovered. All traffic or part of the traffic on the active link is switched to the standby link in advance to reduce services. The retransmission ensures the normal transmission of the service and improves the reliability of the network.

The following describes the specific embodiments of the present invention by taking an IP network, an MPLS network, and a MAC IN MAC network as examples.

Embodiment 1:

Referring to Figure 2, in the IP network, there are two routes to device F at device B, where the bandwidth of the B-C-E link is 300M, and the bandwidth of the B-D-E link is 200M. When a routing protocol generates a route, the link with the 300M bandwidth is selected as the primary link, and the link with the 200M bandwidth is the standby link.

Then, referring to Figure 3, the methods for implementing service flow switching include:

Step S301, at the device B, through the IP packet Internet exploration (PING, Packet Internet Groper), that is, using the Internet Control Message Protocol (ICMP) response (ICMP Echo) and its response to test a certain IP network Whether the network devices are reachable to detect the quality of the primary and backup links, and collect related parameters such as delay, jitter, and packet loss rate of the primary and backup links to generate a database of the primary and backup links.

Step S302: periodically check the parameters of the delay, jitter, and packet loss rate of the active and standby links in the database. If the delay and jitter of the active link are large, the packet loss rate is higher than the pre-established Scope, and the quality of the backup link is good. At this time, by reducing the weight value of the primary link, increasing the weight value of the standby link, all or part of the traffic of the primary link is switched to the standby link, thereby reducing The traffic of the primary link reduces the retransmission of packets.

Step S303: After the quality of the primary link is restored, re-adjust the weight of the primary and backup links to restore the original service traffic of the primary link.

When the service traffic is switched to the standby link, you can configure the policy to switch the traffic of the key services (such as voice and video) to the backup link to ensure the services with higher real-time performance.

If the two links work in the load balancing mode, that is, the primary and backup links are equal, the quality of the two links can be monitored and the high-quality traffic is selected to be transmitted. Ensure the normal transmission of high priority services.

Embodiment 2:

Referring to Figure 4, in the MPLS network, there are two LSP tunnels to the device F at the device B. The bandwidth of the BCE link is 300 M, the bandwidth of the BDE link is 200 M, and the LSP tunnel of the 300 M bandwidth is the primary link. The bandwidth LSP tunnel is the standby link.

Then, referring to Figure 5, the method for implementing service traffic switching includes:

Step S501: At the device B, the LSP PING is used to detect the quality of the primary and backup LSP tunnels, and the related parameters such as the delay, jitter, and packet loss rate of the primary and backup LSPs are collected periodically to generate a database of the primary and secondary LSP tunnels.

Step S502: The parameters of the delay, jitter, and packet loss rate of the primary and secondary LSPs in the database are periodically checked. If the delay and jitter of the primary LSP tunnel are large, the packet loss rate is higher than the pre-established Scope, and the quality of the backup LSP tunnel is good. In this case, by reducing the weight of the primary LSP tunnel, the weight of the standby LSP tunnel is increased, and part of the traffic of the primary LSP tunnel is switched to the standby LSP tunnel, thereby reducing the primary usage. The traffic of the LSP tunnel reduces the retransmission of packets. Step S503: After the quality of the primary LSP tunnel is restored, the weight of the primary and secondary LSP tunnels is re-adjusted, and the original service traffic of the primary LSP tunnel is restored.

Embodiment 3:

Referring to Figure 6, in the MAC IN MAC network, there are two MAC IN MAC tunnels to device F at device B, where the BCE link is 300M, the BDE link is 200M, and the 300 MB bandwidth MAC IN MAC tunnel is the primary link. The MAC IN MAC tunnel of 200M bandwidth is the standby link.

Then, see Figure 7, the methods to achieve business traffic switching include:

Step S701: At device B, the MAC address of the primary and backup MAC IN MAC tunnels is detected by MAC PING of 802. lag, and related parameters such as delay, jitter, and packet loss rate of the primary and backup MAC IN MAC tunnels are collected periodically, and the main parameters are generated. , the database of the MAC IN MAC tunnel.

Step S702: periodically check the parameters of the delay, jitter, and packet loss rate of the primary and backup MAC IN MAC tunnels in the database. If the delay and jitter of the primary MAC IN MAC tunnel are large, the packet loss rate is high. The pre-defined range, and the quality of the standby MAC IN MAC tunnel is better. At this time, by lowering the weight value of the primary MAC IN MAC tunnel, the weight value of the standby MAC IN MAC tunnel is increased, and the primary MAC IN MAC tunnel is used. A part of the traffic is switched to the standby MAC IN MAC tunnel, which reduces the traffic of the primary MAC IN MAC tunnel and reduces the retransmission of packets.

Step S703: After the quality of the primary MAC IN MAC tunnel is restored, re-adjust the weight value of the primary and backup MAC IN MAC tunnels to restore the original service traffic of the primary MAC IN MAC tunnel.

Referring to FIG. 8, a method provided by an embodiment of the present invention is provided, including:

Step S801: Check the link quality of the primary and backup links.

Step S802: When the link quality parameter of the primary link is greater than or equal to a preset threshold, and the link quality parameter of the standby link corresponding to the primary link is smaller than the preset threshold, Switch traffic on the primary link to the alternate link.

Step S803: When the link quality of the primary link is restored, the service traffic of the primary link is restored. Referring to FIG. 9, the apparatus provided by the embodiment of the present invention includes: a link quality detecting unit 91, a traffic switching unit 92, and a traffic recovery unit 93.

The link quality detecting unit 91 is configured to: when the link quality parameter of the primary link is greater than or equal to a preset threshold, and the link quality parameter of the standby link corresponding to the primary link is smaller than the The flow rate switching unit 92 is triggered when a predetermined threshold is set.

The traffic switching unit 92 is configured to switch service traffic on the primary link to the standby link according to the triggering of the link quality detecting unit 91.

The traffic recovery unit 93 is configured to re-switch the service traffic on the standby link to the active link when the link quality parameter of the primary link is smaller than a preset threshold.

The link quality detecting unit 91 includes:

The parameter obtaining unit 911 is configured to periodically collect link quality parameter information of the primary and secondary links, and generate a database.

The determining unit 912 is configured to check the database by using a period, when the link quality parameter of the active link is found to be greater than or equal to a preset threshold, and the link quality parameter of the standby link is less than a preset width. And determining, by the value, that the link parameter of the primary link is greater than or equal to a preset threshold, and the link parameter of the standby link is smaller than the preset threshold, and triggering the traffic switching unit 92.

The flow switching unit 92 includes:

The adjusting unit 921 is configured to reduce the weight value of the primary link and increase the weight value of the standby link.

The switching unit 922 is configured to switch the service traffic on the primary link to the standby link according to the weight value of the primary and backup links processed by the adjusting unit 921.

Preferably, the switching unit 922 further switches part of the service traffic transmitted on the primary link to the backup link according to the preset service priority.

In summary, the embodiments of the present invention are applicable to an IP network and an MPLS network (including an MPLS public network, an MPLS Layer 2 virtual private network, and an MPLS Layer 3 virtual private network (L3VPN, Layer 3). Virtual private networks ) ) and MAC IN MAC networks. By detecting the link of the primary and backup links Quality, before the failure of the primary link, the entire service traffic or part of the service traffic of the active link is switched to the standby link. Therefore, the packet loss rate of the transmitted service data is reduced, and the normal transmission of the service is ensured. . At the same time, the burden on the primary link is reduced, and the probability of the primary link failing is reduced, thereby improving the reliability of the network. In addition, in the embodiment of the present invention, if the link/tunnel works in the load sharing mode, the quality of each link can be monitored, and the link with high priority is selected to transmit the high quality link, so that the high priority service is transmitted. More reliable.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware or by software plus necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Rights request

A service traffic switching method, the method comprising:

Detecting link quality of the primary link and the backup link corresponding to the primary link;

When the link quality parameter of the primary link is greater than or equal to a preset threshold, and the link quality parameter of the standby link is smaller than the preset threshold, the primary usage is Traffic on the link is switched to the alternate link.

2. The method according to claim 1, wherein after detecting the link quality of the primary link and the backup link corresponding to the primary link, the primary link is Before the service traffic on the standby link is switched, the method further includes:

Collecting link quality parameter information of the primary link and the backup link periodically, and generating a database of the primary and backup links according to the link quality parameter information; periodically viewing the primary and backup links in the database Quality parameter information.

3. The method according to claim 1, wherein the weighting of the primary link is increased, and the weight of the standby link is increased, and the service on the primary link is implemented. Traffic is switched to the alternate link.

The method of claim 1, wherein the switching the service traffic on the primary link to the standby link comprises:

Part of the traffic on the primary link is switched to the alternate link according to a preset service priority.

The method according to any one of claims 1 to 4, wherein after the service traffic on the active link is switched to the standby link, the method further includes:

When it is found that the link quality parameter of the primary link is less than a preset threshold, the service traffic on the standby link is switched to the primary link.

A service flow control device, the device comprising: a link quality detecting unit and a flow switching unit;

The link quality detecting unit is configured to: when a link quality parameter of the primary link is greater than or equal to a preset threshold, and a link quality parameter of the standby link corresponding to the primary link is smaller than the foregoing When the threshold is set, the flow switching unit is triggered; The traffic switching unit is configured to switch service traffic on the primary link to the standby link according to triggering by the link quality detecting unit.

The device according to claim 6, wherein the link quality detecting unit comprises: a parameter obtaining unit, configured to periodically collect link quality parameter information of the primary link and the standby link;

a determining unit, configured to: when a link quality parameter of the primary link is greater than or equal to the preset threshold, and a link quality parameter of the standby link is smaller than the preset threshold Determining that the link parameter of the primary link is greater than or equal to a preset threshold, and the link parameter of the standby link is smaller than the preset threshold, and triggering the traffic switching unit .

The device according to claim 6, wherein the traffic switching unit comprises: an adjusting unit, configured to reduce a weight value of the primary link, and increase a weight value of the standby link; And for switching service traffic on the primary link to the standby link according to weight values of the primary link and the backup link processed by the adjusting unit.

The device according to claim 6, wherein the traffic switching unit switches part of the traffic on the primary link to the standby link according to a pre-set service priority.

The device according to any one of claims 6 to 9, wherein the device further comprises:

And a traffic recovery unit, configured to: when the link quality parameter of the primary link is less than a preset threshold, re-switch the service traffic on the standby link to the primary link.