WO2013007124A1

WO2013007124A1 - Method and system for advertising virtual router redundancy protocol link protection

Info

Publication number: WO2013007124A1
Application number: PCT/CN2012/074936
Authority: WO
Inventors: 汤跃娟
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-14
Filing date: 2012-04-28
Publication date: 2013-01-17
Also published as: CN102882779A

Abstract

Disclosed are a method and system for advertising virtual router redundancy protocol (VRRP) link protection, the method comprising: binding a tunnel with a rerouting function between the devices in a same VRRP group; and transmitting a VRRP packet between the devices via the tunnel. The present invention improves the reliability of the link.

Description

The present invention relates to the field of communications, and in particular to a virtual router redundancy protocol (VRRP) advertised link protection method and system. Background technique

The VRRP protocol is defined in RFC3768 and is a fault-tolerant protocol. When the next hop device A (Device A) of the host (Host A) fails, another device B replaces the faulty A to work. Maintain continuity and reliability of network communications. 1 is a schematic diagram of an application scenario of VRRP according to the related art. As shown in FIG. 1, a switch (Switch etc.) exists between a host and a VRRP group, and a VRRP group (BP, virtual router) Each device exchanges VRRP packets and selects the master device by the priority. The master sends its own virtual media access by sending an address resolution protocol (ARP) packet. The control (Media Access Control, MAC for short) address is notified to the device or host connected to it, thereby carrying out the packet forwarding task and accessing the network (NetWork). The master periodically sends VRRP packets to advertise its configuration information (for example, priority, etc.) and working status. If the master is faulty, the backup device in the VRRP group will re-elect the new master according to the priority. The new master simply sends a gratuitous ARP packet carrying the virtual MAC address and virtual IP address of the VRRP group to the host. , thus taking over the message forwarding task. In the same VRRP group, only one master can exist at the same time. Otherwise, traffic will be oscillated. FIG. 2 is a schematic diagram of another application scenario of the VRRP according to the related art. As shown in FIG. 2, a user edge (Customer Edge, CE for short) device accesses an access device, and then the access device passes. Two channels, the Work Tunnel and the Protect Tunnel, are connected to the Provider Edge (PE) device. The PE device is also connected to the CE device through the corresponding link. In a packet transport network, VRRP is mainly used to provide link protection between PE-CE devices. The prerequisites for the VRRP group to be valid are that the devices in the VRRP group need to be able to communicate with each other. If a device does not receive advertisements from the masters in the group, the device automatically upgrades to the master device. Through the above analysis, the difference between the two application scenarios is as follows: In Figure 1, the a link is the protected link, and the VRRP advertisement message is also sent through the a link; in Figure 2, the a link is the protected link. However, it is connected to the CE, and VRRP advertisements cannot be sent over the a link. FIG. 3 is a schematic diagram showing a path c between a PEA and a PEB according to the related art. As shown in FIG. 3, a c-channel is additionally provided between PE A and PE B. In this case, the link c is used to exchange VRRP information between A and B. When the a link fails, PE A sends a notification to PE B through link c to upgrade PE B to master. The PEB undertakes the task of data forwarding. . When the PE A node fails, PE B passes the timeout mechanism and waits for a certain period of time to automatically upgrade to the master, thus taking over data forwarding. This networking mode enables VRRP to be applied to the dual-homing network of the packet-transport network to implement active/standby protection of the links between PEs and CEs. However, in this application mode, the c link is a critical link. If the c link fails, but the links a and b are normal, PE A and PE B are also working properly. PE A and PE B cannot communicate because they cannot communicate. Will become the master at the same time. At this time, the CE device continuously receives free ARP advertisements from different devices (, Α ΡΕ Β), and it is impossible to identify which device to send the data to, which will cause the business to be intermittent. In view of the problem of intermittent business interruption caused by the occurrence of multiple Master situations due to the failure of the announcement link in the related art, an effective solution has not been proposed yet. SUMMARY OF THE INVENTION Embodiments of the present invention provide a VRRP advertisement link protection method and system to solve at least the above problems. According to an aspect of the present invention, a virtual routing redundancy protocol VRRP advertisement link protection method is provided, including: binding a tunnel with rerouting function between devices in the same VRRP group; The device transmits VRRP packets. Preferably, the binding of the tunnel between the devices in the VRRP group includes: the devices are connected by a physical link, where the physical link is used to transmit the VRRP packet, the tunnel Pre-bound on the physical link; after detecting the physical link failure, binding the tunnel to other links capable of forming a connection between the devices. Preferably, detecting the physical link failure comprises: detecting the physical link failure by using a bidirectional forwarding detection BFD. Preferably, the rerouting function of the tunnel is implemented by fast rerouting the FRR or by configuring a new tunnel. Preferably, the tunnel comprises a dynamic tunnel and/or a static tunnel based on a label distribution protocol. According to another aspect of the present invention, a virtual routing redundancy protocol VRRP advertisement link protection system is provided, where the system includes multiple devices in the same VRRP group, and the device includes: a binding module, The tunnel is configured to be bound to the other devices in the VRRP group and has a rerouting function. The transmission module is configured to transmit VRRP packets between the devices through the tunnel. Preferably, the binding module is further configured to pre-bind the tunnel to a physical link that is connected between the devices, where the physical link is used to transmit the VRRP packet, and After detecting the physical link failure, the tunnel is bound to other links capable of forming a connection between the devices. Preferably, the physical link failure is detected by BFD. Preferably, the rerouting function of the tunnel is implemented by fast rerouting the FRR or by configuring a new tunnel. Preferably, the tunnel comprises a dynamic tunnel and/or a static tunnel based on a label distribution protocol. According to the embodiment of the present invention, a tunnel with a rerouting function is bound between the devices in the same VRRP group; the VRRP packet is transmitted between the devices through the tunnel, which solves the problem caused by the failure of the advertisement link. The emergence of a Master situation has resulted in intermittent business problems, which in turn has improved the stability of the business. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic diagram of an application scenario of VRRP according to the related art; FIG. 2 is a schematic diagram of another application scenario of VRRP according to the related art; FIG. 3 is a PE A and PE B according to the related art. FIG. 4 is a schematic diagram of creating a d link to protect a c link according to an embodiment of the present invention; FIG. 5 is a flowchart of a VRRP advertisement link protection method according to an embodiment of the present invention; 6 is a structural block diagram of a VRRP advertisement link protection system according to an embodiment of the present invention; FIG. 7 is a schematic diagram of a VRRP advertisement link protection method in a packet transmission dual-homing network according to a preferred embodiment of the present invention; FIG. 8 is a flowchart of a method for advertised VRRP advertisement link in a packet transmission dual-homing network according to another preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The following embodiment is described by taking the scenario shown in FIG. 3 as an example, but the same applies to other scenarios in which a link between devices in a VRRP group needs to be protected. For the scenario shown in Figure 3, link c needs to be protected. In the present embodiment, a simple method is provided. FIG. 4 is a schematic diagram of creating a d link for protecting a c link according to an embodiment of the present invention. As shown in FIG. 4, the method is at PE A and A physical link d is created between PEs. The links c and d form a port aggregation group (trunk). This reduces the risk caused by the failure of the c link. However, the dual-homing network in Figure 3 and Figure 4 generally appears on the aggregation or core network. In practice, the 10GE interface is more common. This interface does not necessarily take the actual customer service. If you only want to do VRRP. The protocol transmits the protection of the link, and if a 10GE link is to be connected, resources may not be allowed. In the present embodiment, a flow chart of a method for protecting a link protection is provided. FIG. 5 is a flowchart of a method for protecting a link of a VRRP advertisement according to an embodiment of the present invention. The process includes the following steps: Step S502: Binding a tunnel with a rerouting function between devices in the same VRRP group. The tunnel includes, but is not limited to, a dynamic tunnel based on a label distribution protocol and/or Or a static tunnel, for example, may be another dynamic and/or static tunnel, and the rerouting function of the dynamic tunnel may be implemented by Fast ReRouting (FRR), but is not limited thereto. Other protocols with rerouting capabilities are implemented. For example, in the case of protection through a static tunnel, static tunnel protection can be configured. For example, two static tunnels can be configured. In case one of them fails, another static link is enabled to implement protection. Step S504, the VRRP packet is transmitted between the devices through the tunnel. Through the above steps, the tunnel with the rerouting function is bound to the devices in the same VRRP group. The re-routing function is adopted. When the link where the tunnel is located fails, the new route can be automatically found and the tunnel is maintained. Smooth. Therefore, the problem that the multi-master causes the business to be intermittent due to the failure of the advertisement link is solved, thereby achieving the effect of improving the stability of the service. For example, for the scenario shown in Figure 3, an ldp tunnel can be created between PE A and PE B (other types of dynamic or static tunnels are also applicable, here The ldp is used as an example. The VRRP information is directly forwarded to the PEB by the ldp tunnel tunnel A-B. Correspondingly, only the tunnel protection of the tunnel A-B is required to protect the VRRP information. In a preferred embodiment, if the physical link is used to transmit VRRP packets, the physical link can be fully utilized to bind the tunnel to the physical link. After detecting the physical link failure, the tunnel is bound to other links that can form a connection between the devices. It should be noted that the method for detecting the physical link failure may be, but is not limited to, detection by two-way forwarding. (Bidirectional Forwarding Detection, abbreviated as BFD) detection, any manner of detecting physical links and tunnels is applicable to the present invention. For example, it can also be done by other protocols with detection functions. 6 is a structural block diagram of a VRRP advertisement link protection system according to an embodiment of the present invention. As shown in FIG. 6, the system includes multiple devices in the same VRRP group, each of which includes a binding module 60 and Transmission module 62. As used hereinafter, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the systems and methods described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated. The descriptions of the modules and their functions will be described below. The binding module 60 is configured to bind a tunnel with re-routing function to other devices in the VRRP group. The tunnel includes, but is not limited to, a dynamic tunnel and/or a static tunnel based on a label distribution protocol, for example, It can be other dynamic and/or static tunnels, and the rerouting function of the tunnel can be implemented by, but not limited to, Fast Route (FRR). For example, other protocols with rerouting function can also be used. To achieve and so on. The transmission module 62 is connected to the binding module 60, and the module is configured to transmit VRRP packets between the devices through the tunnel. Preferably, the binding module 60 is further configured to pre-bind the tunnel to the physical link between the devices, where the physical link is used to transmit the VRRP packet, and after detecting the physical link failure, the tunnel is Binding to other links capable of forming a connection between devices, the method for detecting a physical link failure may be, but is not limited to, Bidirectional Forwarding Detection (BFD) detection, for example, It can also be done by other protocols with detection capabilities. The following description is made in conjunction with the preferred embodiments incorporating the above-described embodiments and preferred embodiments thereof. FIG. 7 is a schematic diagram of a VRRP advertisement link protection method in a packet transmission dual-homing network according to a preferred embodiment of the present invention. As shown in FIG. 7, by creating an ldp tunnel between a PEA and a PEB, VRRP information directly proceeds. The ldp tunnel tunnel A-B is forwarded to the PE B. Correspondingly, only the TunnelA-B tunnel protection is required to protect the VRRP information. In the implementation, firstly, a VRRP group is created at points A and B respectively. Secondly, the Layer 2 transparent transmission service between the AB points is bound to the ldp dynamic tunnel, and the FRR function of the dynamic tunnel is enabled to forward the VRRP group advertisement information. If link c fails between ABs; path forwarding becomes ldp2 through ldp dynamic rerouting. FIG. 8 is a flowchart of a method for protecting a VRRP advertisement link in a packet transmission dual-homing network according to another preferred embodiment of the present invention. As shown in FIG. 8, the process includes the following steps: Step S802: A device creates a VRRP group. For example, the virtual address is 17.1.1.100; the B device creates a VRRP group whose virtual address is also 17.1.1.100. Step S804, a transparent transmission service is created between the ABs, and a dynamic ldp tunnel is bound, and the tunnel is opened.

BFD detection and FRR function. In the preferred embodiment, the ldp tunnel takes ldpl as an example. In the step S806, the A device VRRP group is bound to the interface A between the PEA and the CE, and the VRRP group and the L2VPN service are associated with each other. The VRRP packet is forwarded to the transparent service. The same B device VRRP group is bound to the PE B. On the interface B, the VRRP group and the L2VPN service are associated with each other. The VRRP packets are forwarded to the transparent transmission service. Step S808: In the initial state, the VRRP packet is sent out through the a, b, and ldpl links, and the CE device ignores the protocol packet. The A and B devices negotiate to select the A device as the master; the A device passes the a chain. The device sends a free ARP packet to notify the CE device of the virtual IP address 17.1.1.100 and the virtual MAC address. The CE device uses this virtual MAC address and IP address to communicate with A. Step S810, if the a link fails, the VRRP protocol can reduce the VRRP priority of the A device by monitoring the a link, and induce the switching; if the A device fails, the B device automatically upgrades to the master after the timeout period; Step S812, if the c chain If the path is invalid, the ldp tunnel detection BFD mechanism quickly detects the fault and starts the FRR switchover of the ldp tunnel. At this time, the Layer 2 forwarding transparent transmission service transfers the VRRP packet to the ldp2 tunnel for forwarding, and the damage time will be controlled within 50ms. With the above preferred embodiment and its preferred embodiment, in the case that the c link fails, the dynamic tunnel can be automatically rerouted through the FRR function, thereby avoiding the double master phenomenon caused by the c link failure, and further achieving the protection of the VRRP. The purpose of the notification message is normally delivered, thus providing a reliable link. In another embodiment, a VRRP advertisement link protection software is provided, which is used to implement the technical solutions described in the foregoing embodiments and preferred embodiments. In another embodiment, a storage medium is provided, and the VRRP advertisement link protection software is stored in the storage medium, and the storage medium includes, but is not limited to, an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to 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

Claim

1. A virtual routing redundancy protocol VRRP advertising link protection method, including:

Bind a tunnel with rerouting between devices in the same VRRP group.

The VRRP packet is transmitted between the devices through the tunnel.

2. The protection method according to claim 1, wherein binding the tunnel between devices in the VRRP group comprises:

The devices are connected by a physical link, where the physical link is used to transmit the VRRP packet, and the tunnel is pre-bound on the physical link;

After detecting the physical link failure, the tunnel is bound to other links capable of forming a connection between the devices.

3. The protection method according to claim 2, wherein detecting the physical link failure comprises:

The BFD detects the physical link failure through bidirectional forwarding detection.

The protection method according to claim 3, wherein the rerouting function comprises implementing the FRR by fast rerouting or by configuring a new tunnel.

The protection method according to any one of claims 1 to 4, wherein the tunnel comprises a dynamic tunnel and/or a static tunnel based on a label distribution protocol.

A virtual routing redundancy protocol VRRP advertises a link protection system, which includes multiple devices in the same VRRP group. The device includes:

a binding module, configured to bind a tunnel with a rerouting function to other devices in the VRRP group;

The transmission module is configured to transmit a VRRP packet between the devices through the tunnel.

The protection system according to claim 6, wherein the binding module is further configured to bind the tunnel to a physical link connected between the devices, where the physical link And transmitting the VRRP packet, and after detecting the physical link failure, binding the tunnel to another link capable of forming a connection between the devices.

8. The protection system according to claim 7, wherein the physical link failure is detected by BFD. The protection system according to claim 8, wherein the rerouting function comprises implementing by fast rerouting the FRR or by configuring a new tunnel. The protection system according to any one of claims 6-9, wherein the tunnel comprises a dynamic tunnel and/or a static tunnel based on a label distribution protocol.