WO2016101492A1 - 一种业务转发表的设置方法及装置 - Google Patents

一种业务转发表的设置方法及装置 Download PDF

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WO2016101492A1
WO2016101492A1 PCT/CN2015/078694 CN2015078694W WO2016101492A1 WO 2016101492 A1 WO2016101492 A1 WO 2016101492A1 CN 2015078694 W CN2015078694 W CN 2015078694W WO 2016101492 A1 WO2016101492 A1 WO 2016101492A1
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tunnel
information
service
path
protection group
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PCT/CN2015/078694
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English (en)
French (fr)
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刘建立
王志成
李爱民
李海艳
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中兴通讯股份有限公司
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Publication of WO2016101492A1 publication Critical patent/WO2016101492A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications

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  • This document relates to the technical field of Multi-Protocol Label Switching Traffic Engineering (MPLS TE), and in particular, to a method and an apparatus for setting a service forwarding table.
  • MPLS TE Multi-Protocol Label Switching Traffic Engineering
  • the traditional IP network is a "best effort" service model that does not guarantee reliability itself.
  • MPLS Multi-Protocol Label Switching
  • QoS Quality of Service
  • multi-service support Important role.
  • To ensure the reliability of the communication network you need to configure various TE linear protection measures to protect the links or nodes in the network when deploying MPLS TE (Traffic Engineering)-based networks.
  • Common protection includes The TE tunnel protection group TG (Tunnel Group) and the TE LSP (Label Switching Path) path protection.
  • the TE LSP path protection includes the fast rerouting technology TE FRR (Fast Reroute) and TE Hot- Standby (TE hot backup), the protection of the LSP path is generally called LSPG (LSP Group).
  • L2VPN On the Layer 2 Virtual Private Network, the PW (Pseudo Wire) is placed on the TE tunnel.
  • the tunnel protection group TG is configured on the TE tunnel. After the TG protection is configured, the TG is configured.
  • the working tunnel in the nested LSPG protection forms a two-level nested protection.
  • the implementation of the related art performs the distinction between the tunnel protection group TG and the LSPG, and the above is still taken as an example.
  • the TG and TG entries are associated with the TG and TG entries.
  • the TG table is used to check the TG table.
  • the LSPG identifier and related key values are obtained, and the LSPG related entries are further searched for the forwarding information such as the outbound interface.
  • the prefix forwarding entry also needs to be reserved with two identifiers to distinguish whether the TG or LSPG is currently configured.
  • This document provides a method and a device for setting a service forwarding table, which solves the problem of finding that a forwarding path needs to be searched for multiple related entries step by step when configuring multiple TE linear protection measures, and the forwarding efficiency is low due to inefficient lookup, and the problem is improved.
  • the forwarding efficiency is reduced while reducing the CPU overhead of the system.
  • next hop exit and egress labels of the LSP path of the TE tunnel are written in the tunnel information table of the primary TE tunnel in which the index is set.
  • the obtaining the service forwarding information and the TE tunnel information of the network includes:
  • the TE tunnel information is obtained by parsing the service information of the TE, where the TE tunnel information includes: Protection group information of the TE tunnel and the TE tunnel.
  • the label switching path LSP of the TE tunnel capable of carrying the current service is determined according to the protection group information of the primary TE tunnel in the TE tunnel information. Path, including:
  • Path LSP path including:
  • the TE is determined to be capable of carrying the current service according to the protection group information of the primary TE tunnel in the TE tunnel information.
  • the label switching path LSP path of the tunnel including:
  • the LSP path of the TE tunnel capable of carrying the current service is determined according to the working state of the label switching path protection group on the TE tunnel that carries the current service.
  • the method further includes:
  • the LSP path of the TE tunnel that carries the current service is faulty, the LSP path is switched according to the protection group information of the TE tunnel.
  • next hop exit and the egress label of the switched LSP path are written in the tunnel information table of the primary TE tunnel in which the index is set.
  • a device for setting a service forwarding table configured to configure a network for protection for a traffic engineering TE, the device comprising:
  • the acquiring module is configured to: obtain service forwarding information of the network and TE tunnel information;
  • the first writing module is configured to: write the service forwarding information into the service forwarding table, and set an identifier and an index for the primary TE tunnel of the bearer service in the service forwarding table;
  • the path determining module is configured to: determine, according to the protection group information of the primary TE tunnel in the TE tunnel information, a label switched path LSP path of the TE tunnel that can carry the current service;
  • the second write module is configured to: write the next hop exit and exit labels of the LSP path of the TE tunnel into the tunnel information table of the primary TE tunnel in which the index is set.
  • the obtaining module includes:
  • the sub-module is obtained, and is set to: obtain the service information of the TE configured by the user;
  • the first parsing module is configured to: parse the service information of the TE, and obtain service forwarding information, where the service forwarding information includes: a primary TE tunnel carrying the service;
  • the second parsing module is configured to: parse the service information of the TE, and obtain TE tunnel information, where the TE tunnel information includes: TE tunnel and protection group information of the TE tunnel.
  • the path determination module includes:
  • the first determining sub-module is configured to: determine an LSP path of the TE tunnel that can carry the current service according to the working state of the tunnel protection group.
  • the path determining module includes:
  • the second determining sub-module is configured to: determine an LSP path of the TE tunnel that can carry the current service according to the working state of the label switching path protection group.
  • the path determining module includes:
  • the third determining submodule is configured to: determine, according to the working state of the tunnel protection group, a TE tunnel that carries the current service;
  • the fourth determining sub-module is configured to determine an LSP path of the TE tunnel capable of carrying the current service according to the working state of the label switching path protection group on the TE tunnel that carries the current service.
  • the device further comprises:
  • the switch module is set to be faulty when the LSP path of the TE tunnel carrying the current service fails. Performing LSP path switching according to the protection group information of the TE tunnel;
  • the third write module is configured to: write the next hop exit and the egress label of the switched LSP path into the tunnel information table of the primary TE tunnel in which the index is set.
  • a computer readable storage medium storing computer executable instructions for performing the method of any of the above.
  • the protection group is configured on the TE tunnel carrying the current service, after checking the service forwarding table, directly checking the TE tunnel information table can obtain the next hop exit and The information such as the egress label does not need to continue to check the related entries of the tunnel protection group or the label switching path protection group, thereby improving the forwarding efficiency.
  • the service forwarding table is not required as long as the primary TE tunnel of the configured bearer service is unchanged. Update the index information in the table, thereby reducing the overhead of the system CPU.
  • FIG. 1 is a schematic diagram of an L2VPN networking based on a nested fast reroute protection of a tunnel protection group
  • FIG. 2 is a schematic diagram of a path storage method for implementing forwarding by a tunnel protection group in related art
  • FIG. 3 is a schematic diagram showing the basic steps of a method for setting a service forwarding table according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a path storage method for implementing forwarding of a tunnel protection group according to an embodiment of the present invention
  • FIG. 5 is a flow chart showing the steps of determining a bearer path of a current service in a method for setting a service forwarding table according to an embodiment of the present invention
  • Fig. 6 is a view showing the configuration of a device for setting a service forwarding table according to an embodiment of the present invention.
  • This document provides a method and a device for setting a service forwarding table, which is configured on a TE tunnel carrying the current service, in the MPLS TE communication network configured with multiple protection measures in the related art.
  • the related entries of the protection group or the label switching path protection group improve the forwarding efficiency.
  • the service forwarding table does not need to update the index information in the table, which reduces the CPU overhead of the system. .
  • an embodiment of the present invention provides a method for setting a service forwarding table, which is used to configure a network for protection for a traffic engineering TE, and the setting method includes:
  • Step 11 Obtain service forwarding information and TE tunnel information of the network.
  • Step 12 Write the service forwarding information into the service forwarding table, and set an identifier and an index for the primary TE tunnel of the bearer service in the service forwarding table.
  • Step 13 Determine, according to the protection group information of the primary TE tunnel in the TE tunnel information, a label switched path LSP path of a TE tunnel that can carry the current service.
  • Step 14 Write the next hop exit and exit labels of the LSP path of the TE tunnel into the tunnel information table of the primary TE tunnel in which the index is set.
  • the LSP path of the TE tunnel that can carry the current service is determined by analyzing the working status of all the links and the working status of the corresponding protection group, and the information such as the next hop exit and egress labels of the LSP path of the TE tunnel is written and set.
  • the tunnel information table of the primary TE tunnel with the index the primary TE tunnel can be directly searched through the index in the service forwarding table, and the tunnel information table of the primary TE tunnel is directly searched for the forwarding information. Check the efficiency of the table.
  • the tunnel index identified in the service forwarding table is always the primary TE tunnel, regardless of whether the LSP path of the TE tunnel carrying the current service is the primary or secondary path of the TE FRR or other standby tunnel.
  • the point guarantee service can only see the main TE tunnel. In this way, the service does not need to be concerned about whether there is protection or protection on the tunnel to be carried.
  • the state of the tunnel-related protection group is not required to be changed.
  • the information of the tunnel information table of the primary TE tunnel is updated in step 14.
  • step 11 includes:
  • Step 111 Obtain service information of the TE configured by the user.
  • Step 112 Analyze the service information of the TE, and obtain service forwarding information, where the service forwarding information includes: a primary TE tunnel carrying the service;
  • Step 113 Analyze the service information of the TE to obtain TE tunnel information, where the TE tunnel information includes: TE tunnel and protection group information of the TE tunnel.
  • the service forwarding information includes the primary TE tunnel carrying the service, that is, the service is carried on the primary TE tunnel, and an identifier is set for the primary TE tunnel, which is used to indicate that the service is carried on the TE tunnel, and is preset in the forwarding table according to the preset
  • the rule is written to the primary TE tunnel index.
  • the preset rule may be numbered according to the sequence of establishing the TE tunnel or other specified rules.
  • the information about the TE tunnel includes the basic information of the TE tunnel, such as the identifier and index of the TE tunnel, the protection group information of the TE tunnel, the protection group information of the primary TE tunnel, and the protection group information of other TE tunnels, such as the tunnel protection group. Referred to as TG), label switched path replacement group (hereinafter referred to as LSPG) and so on.
  • TG label switched path replacement group
  • LSPG label switched path replacement group
  • step 13 includes:
  • Step 131 Determine an LSP path of the TE tunnel that can carry the current service according to the working state of the tunnel protection group. If the TG-protected TE tunnel is working properly, determine the LSP path of the TE tunnel that can carry the current service as the primary path under the TG protection. If the TG-protected TE tunnel is abnormal, determine the LSP path of the TE tunnel that can carry the current service. The backup path under TG protection.
  • step 13 includes:
  • Step 132 Determine an LSP path of the TE tunnel that can carry the current service according to the working state of the label switching path protection group. If the LSP is protected by the LSPG, the LSP that can carry the current TE tunnel is the primary path of the LSPG. If the LSP is protected, the LSP is the LSP. The backup path below.
  • step 13 includes:
  • Step 133 Determine, according to the working state of the tunnel protection group, a TE tunnel that carries the current service.
  • Step 134 Determine an LSP path of the TE tunnel that can carry the current service according to the working state of the label switching path protection group on the TE tunnel that carries the current service.
  • the method further includes:
  • Step 15 When the LSP path of the TE tunnel carrying the current service is faulty, perform LSP path switching according to the protection group information of the TE tunnel.
  • Step 16 Write the next hop exit and exit labels of the switched LSP path into the tunnel information table of the primary TE tunnel in which the index is set.
  • the link detection method such as the BFD detects that the working path is faulty
  • the LSP path is quickly switched according to the corresponding protection group information, and then the step 16 is performed to update the tunnel information table of the primary TE tunnel. The latest information obtained when looking up the table.
  • FIG. 1 The embodiments of the present invention are described below with reference to FIG. 1 :
  • the PE device refers to the carrier edge device
  • the P device refers to the vendor device
  • Two TE tunnels are established between PE1 and PE2.
  • the physical links are TE1 and TE2.
  • VPWS Virtual Private Wire Service
  • a tunnel protection group TG is set up on the PE1.
  • the working tunnel is TE1 and TE2 is the backup tunnel that protects TE1.
  • TE FRR Fest Route Reestablishment
  • LSPG protection is formed on a segment of the TE1 tunnel.
  • the backup LSP path is tunnel TE3.
  • the PE1 On the PE1, obtain the VPN-related forwarding information, the tunnel TE1 information, and the TG protection group and the LSPG protection group information. Write the VPN-related forwarding information to the service forwarding table, and put the TE tunnel identifier and the index of the tunnel TE1 in the forwarding table. Indicates that the VPN service is carried on the tunnel TE1.
  • the tunnel TE1 is associated with the protection information, and the information is forwarded.
  • the information such as the outgoing label and the physical outgoing interface is selected and written in the related entries of the TE1 tunnel to indicate the correct path for the service. information.
  • the tunnel TE1 has a tunnel protection group TG, and the protection tunnel is TE2, and the current tunnel protection group is working on the tunnel TE1. Then, TE FRR protection is formed on the tunnel TE1, and the tunnel TE3 protects a section of the tunnel TE1. Further, it is determined that the protection state of the TE FRR is working on the primary LSP path, and finally the path of the current service bearer is the primary LSP path of the TE FRR. Finally, the forwarding information of the primary LSP path is written into the tunnel TE1 index according to the information of the TE FRR. In the tunnel information.
  • TE FRR switches the working state to the standby LSP path TE3 tunnel and senses TE FRR. After the switchover occurs, it is determined that the current TE FRR effective forwarding path is the tunnel TE3. According to the TE FRR main path tunnel TE1, it is determined that the tunnel TE1 has a tunnel protection group TG, and the TE2 is protected by the tunnel TE2. Further determining that the current working state of the tunnel protection group TG is working in the tunnel TE1;
  • the working status of the integrated tunnel protection group and the TE FRR is determined.
  • the current working tunnel is the tunnel TE1, but the outbound interface and label information are specified for the standby LSP path TE3 of the TE FRR. Finally, the standby LSP path information of the TE FRR is written. Tunnel TE1 in the tunnel information table.
  • the TG of the tunnel protection group is switched to the standby tunnel.
  • the state of the tunnel protection group is changed.
  • the current working status of the TG protection group is determined to be the tunnel TE2. Further, there is no other protection on the TE2.
  • the tunnel TE is selected to obtain the TE2 forwarding information. Write to the tunnel information table of tunnel TE1.
  • the primary and secondary paths of the TE FRR are not selected. Because the TE FRR is the FRR of the tunnel TE1, the tunnel TE1 has failed.
  • the forwarding information notified by the judgment sub-module is written into the tunnel information table of the tunnel TE1.
  • the primary tunnel information table of the LSPG is written by the primary or backup LSP path forwarding information of the LSPG protection group according to the working state of the LSPG;
  • the TE protection and fusion module determines that the current primary tunnel is faulty, and the LSPG protection on the primary tunnel is invalid, and the tunnel information is not written according to the information delivered by the LSPG protection group. table;
  • the main tunnel information table of the LSPG is written by selecting the primary or secondary LSP path information according to the working state of the LSPG;
  • the tunnel information table is directly written by using the forwarding information of the tunnel;
  • the LSPG protection is notified to select the corresponding LSP path information to write the primary tunnel information table of the TG according to its working state.
  • the embodiment of the present invention further provides a device for setting a service forwarding table, which is used to configure a network for protection for a traffic engineering TE, and the device includes:
  • the obtaining module 61 is configured to: obtain service forwarding information and TE tunnel information of the network;
  • the first writing module 62 connected to the obtaining module 61 is configured to: write the service forwarding information into the service forwarding table, and set an identifier and an index for the primary TE tunnel carrying the service in the service forwarding table;
  • the path determining module 63 which is connected to the obtaining module 61, is configured to: determine, according to the protection group information of the primary TE tunnel in the TE tunnel information, a label switched path LSP path of a TE tunnel that can carry the current service;
  • the second write module 64 connected to the first write module 62 and the path determination module 63 is configured to: write the next hop exit and exit labels of the LSP path of the TE tunnel to the primary TE set with the index The tunnel information table of the tunnel.
  • the obtaining module 61 includes:
  • the sub-module is obtained, and is set to: obtain the service information of the TE configured by the user;
  • the first parsing module is configured to: parse the service information of the TE, and obtain service forwarding information, where the service forwarding information includes: a primary TE tunnel carrying the service;
  • the second parsing module is configured to: parse the service information of the TE, and obtain TE tunnel information,
  • the TE tunnel information includes: TE tunnel and protection group information of the TE tunnel.
  • the path determination module 63 when the primary TE tunnel has only a tunnel protection group, the path determination module 63 includes:
  • the first determining sub-module is configured to: determine an LSP path of the TE tunnel that can carry the current service according to the working state of the tunnel protection group.
  • the path determining module 63 when the primary TE tunnel has only the label switching path protection group, the path determining module 63 includes:
  • the second determining sub-module is configured to: determine an LSP path of the TE tunnel that can carry the current service according to the working state of the label switching path protection group.
  • the path determining module 63 when the primary TE tunnel has a tunnel protection group nested label switching path protection group, the path determining module 63 includes:
  • the third determining submodule is configured to: determine, according to the working state of the tunnel protection group, a TE tunnel that carries the current service;
  • the fourth determining sub-module is configured to determine an LSP path of the TE tunnel capable of carrying the current service according to the working state of the label switching path protection group on the TE tunnel that carries the current service.
  • the device further includes:
  • the switching module is configured to perform LSP path switching according to the protection group information of the TE tunnel when the LSP path of the TE tunnel that carries the current service is faulty.
  • the third write module is configured to: write the next hop exit and the egress label of the switched LSP path into the tunnel information table of the primary TE tunnel in which the index is set.
  • the service forwarding table in the method for setting the service forwarding table in the embodiment of the present invention, whether a protection group is configured on the TE tunnel that carries the current service, and after checking the service forwarding table, directly checking the TE tunnel information table to obtain the next hop.
  • the information such as the egress and egress labels does not need to continue to check the related entries of the tunnel protection group or the label switching path protection group, which improves the forwarding efficiency.
  • the service forwarding table does not need to be updated as long as the primary TE tunnel of the configured bearer service is unchanged.
  • the index information in the table reduces the overhead of the system CPU.
  • the computer program can be implemented in a computer readable storage medium, the computer program being executed on a corresponding hardware platform (such as a system, device, device, device, etc.), when executed, including One or a combination of the steps of the method embodiments.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the protection group is configured on the TE tunnel carrying the current service, after checking the service forwarding table, directly checking the TE tunnel information table can obtain the next hop exit and The information such as the egress label does not need to continue to check the related entries of the tunnel protection group or the label switching path protection group, thereby improving the forwarding efficiency.
  • the service forwarding table is not required as long as the primary TE tunnel of the configured bearer service is unchanged. Update the index information in the table, thereby reducing the overhead of the system CPU.

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Abstract

一种业务转发表的设置方法及装置，该设置方法包括：获取网络的业务转发信息以及TE隧道信息；将业务转发信息写入业务转发表，并在业务转发表中为承载业务的主TE隧道设置标识和索引；根据TE隧道信息中主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；将TE隧道的LSP路径的下一跳出口及出口标签写入设置有索引的主TE隧道的隧道信息表中。

Description

一种业务转发表的设置方法及装置 技术领域
本文涉及多协议标签交换流程工程(MPLS TE，Multi-Protocol Label Switching Traffic Engineering)技术领域，特别涉及一种业务转发表的设置方法及装置。
背景技术
传统的IP网络是一种“尽力而为”的服务模型，本身不能保证可靠性。随着网络的进一步发展，作为多业务统一承载的IP网络，必须要达到传统电信级网络的水平，才能满足电信级业务的需求。MPLS(Multi-Protocol Label Switching，多协议标签交换)技术自出现起，由于具备快速转发、QoS(Quality of Service，服务质量)保证、多业务支持等优势，在现代电信网络中扮演着越来越重要的角色。为了保证通讯网络的可靠性，通常在部署基于MPLS TE(Traffic Engineering，流量工程)的网络时需要配置各种TE线性保护措施，来对网络中的链路或者节点进行保护，常用的保护包括对TE tunnel的保护隧道保护组TG(Tunnel Group)和对TE LSP(Label Switching Path，标签交换路径)路径的保护，对TE LSP路径的保护包括快速重路由技术TE FRR(Fast Reroute)和TE Hot-standby(TE热备份)，对LSP路径的保护一般称为LSPG(LSP Group).
在基于MPLS TE的通讯网络中，为了保证转发的可靠性，通常会配置多种保护措施，甚至是配置了某种保护后再对其进行嵌套保护，常见的如图1所示，L2VPN(Layer2Virtual Private Network，二层虚拟私有网络)组网中，配置PW(Pseudo Wire，伪线)外层承载在TE隧道上，在TE隧道上配置了隧道保护组TG，配置TG保护之后，再对TG中的工作Tunnel嵌套LSPG保护，形成两级嵌套保护。
相关技术的实现方式对于隧道保护组TG和LSPG做区分处理，仍以上述为例。如图2所示，在前一级相关转发表项中会有TG标识和TG表项相关键值，以表示当前组网配置了TG保护，用TG表项键值进一步查TG相关表 项，会获取LSPG标识和相关键值，再进一步查找LSPG相关表项最终获取出接口等转发信息。对于只是单纯的TG保护或者是LSPG保护时，前缀转发表项中也需要预留两个标识来区分当前配置了TG还是LSPG。
由此可见，这种把TG和LSPG当作两种保护类型来处理的方式存在查表效率低下的缺点：既要在前缀转发表中区分不同的标识，增加了查表的复杂度，在TG嵌套LSPG的情况下，又需要额外多一级查表操作，带来查表效率的降低。而且当TG或者LSPG发生索引更新变化时，前缀转发表也需要相应的进行表项更新操作，增加了CPU的开销，尤其在业务量巨大的时候，CPU开销更多。
发明内容
本文提供一种业务转发表的设置方法及装置，解决了配置多种TE线性保护措施时查找转发路径需逐级查找多个相关表项，查表效率低下而导致的转发效率低的问题，提高了转发效率，同时降低了系统CPU的开销。
一种业务转发表的设置方法，用于为流量工程TE配置保护的网络，所述设置方法包括：
获取所述网络的业务转发信息以及TE隧道信息；
将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
其中，所述获取所述网络的业务转发信息以及TE隧道信息，包括：
获取用户配置的TE的业务信息；
解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
解析所述TE的业务信息，得到TE隧道信息，所述TE隧道信息包括： TE隧道以及TE隧道的保护组信息。
其中，当所述主TE隧道仅有隧道保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径，包括：
根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
其中，当所述主TE隧道仅有标签交换路径保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径，包括：
根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
其中，当所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径，包括：
根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
其中，所述方法还包括：
当承载当前业务的TE隧道的LSP路径出现故障时，根据所述TE隧道的保护组信息进行LSP路径切换；
将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
一种业务转发表的设置装置，用于为流量工程TE配置保护的网络，所述装置包括：
获取模块，设置为：获取所述网络的业务转发信息以及TE隧道信息；
第一写入模块，设置为：将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
路径确定模块，设置为：根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
第二写入模块，设置为：将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
其中，所述获取模块包括：
获取子模块，设置为：获取用户配置的TE的业务信息；
第一解析模块，设置为：解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
第二解析模块，设置为：解析所述TE的业务信息，得到TE隧道信息，所述TE隧道信息包括：TE隧道以及TE隧道的保护组信息。
其中，当所述主TE隧道仅有隧道保护组时，相应地，所述路径确定模块包括：
第一确定子模块，设置为：根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
其中，当所述主TE隧道仅有标签交换路径保护组时，相应地，所述路径确定模块包括：
第二确定子模块，设置为：根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
其中，当所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，所述路径确定模块包括：
第三确定子模块，设置为：根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
第四确定子模块，设置为：根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
其中，所述装置还包括：
切换模块，设置为：当承载当前业务的TE隧道的LSP路径出现故障 时，根据所述TE隧道的保护组信息进行LSP路径切换；
第三写入模块，设置为：将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行上述任一项的方法。
本发明实施例的业务转发表的设置方法及装置中，无论承载当前业务的TE隧道上是否配置保护组，在查完业务转发表后，直接查TE隧道信息表即可获得下一跳出口及出口标签等信息，可以不用再继续查隧道保护组或标签交换路径保护组的相关表项，由此提高了转发效率；同时只要配置的承载业务的主TE隧道不变，业务转发表就不需要更新表中的索引信息，由此降低了系统CPU的开销。
附图概述
图1表示基于隧道保护组嵌套快速重路由保护的L2VPN组网示意图；
图2表示相关技术中隧道保护组实现转发的路径存储方法示意图；
图3表示本发明实施例的业务转发表的设置方法的基本步骤示意图；
图4表示本发明实施例的隧道保护组实现转发的路径存储方法示意图；
图5表示本发明实施例的业务转发表的设置方法中确定当前业务的承载路径的步骤流程图；
图6表示本发明实施例的业务转发表的设置装置的组成结构图。
本发明的实施方式
下面将结合附图对本发明的实施方式进行详细描述。
本文针对相关技术中配置多种保护措施的MPLS TE通讯网络中查表效率低下且CPU开销较大的问题，提供一种业务转发表的设置方法及装置，无论承载当前业务的TE隧道上是否配置保护组，查完业务转发表后，直接查TE隧道信息表即可获得下一跳出口及出口标签等信息，不用再继续查隧道保 护组或标签交换路径保护组的相关表项，提高了转发效率；同时只要配置的承载业务的主TE隧道不变，业务转发表就不需要更新表中的索引信息，降低了系统CPU的开销。
如图3所示，本发明实施例提供一种业务转发表的设置方法，用于为流量工程TE配置保护的网络，所述设置方法包括：
步骤11，获取所述网络的业务转发信息以及TE隧道信息；
步骤12，将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
步骤13，根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
步骤14，将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
通过分析所有链路的工作状态及其对应保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径，并将该条TE隧道的LSP路径的下一跳出口及出口标签等信息写入设置有所述索引的主TE隧道的隧道信息表中，则查表时能够直接从业务转发表中通过索引查找到该主TE隧道，进而直接查找该主TE隧道的隧道信息表获得转发信息，提高了查表效率。同时需要强调的是，在以上处理中，不论承载当前业务的TE隧道的LSP路径是TE FRR的主、备路径，还是其他备用隧道，业务转发表中标识的隧道索引始终是主TE隧道，这点保证业务只能看到主TE隧道。这样，业务不需要关心所承载的隧道上是否有保护、有何种保护，始终不需要感知隧道相关保护组状态的变更，主TE隧道的隧道信息表的信息通过步骤14进行更新。
本发明的上述实施例中，步骤11包括：
步骤111，获取用户配置的TE的业务信息；
步骤112，解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
步骤113，解析所述TE的业务信息，得到TE隧道信息，所述TE隧道信息包括：TE隧道以及TE隧道的保护组信息。
业务转发信息中包括承载业务的主TE隧道，即业务承载在该主TE隧道上，为该主TE隧道设置一个标识，用来表示业务承载在TE隧道上，并在转发表中根据预置的规则，写入该主TE隧道索引；其中，该预置规则可以根据TE隧道建立的先后顺序或者其他指定规则编号。TE隧道信息中包括TE隧道的基本信息，如TE隧道的标识、索引等等以及TE隧道的保护组信息，主TE隧道的保护组信息以及其他TE隧道的保护组信息，例如隧道保护组(以下简称TG)、标签交换路径包换组(以下简称LSPG)等等。
本发明实施例中主要包括三个场景：场景一：所述主TE隧道仅有隧道保护组时，相应地，步骤13包括：
步骤131，根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。若TG保护的TE隧道正常工作时，确定能够承载当前业务的TE隧道的LSP路径为TG保护下的主路径；若TG保护的TE隧道出现异常，确定能够承载当前业务的TE隧道的LSP路径为TG保护下的备路径。
场景二：所述主TE隧道仅有标签交换路径保护组时，相应地，步骤13包括：
步骤132，根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。若LSPG保护的TES隧道正常工作时，确定能够承载当前TE隧道的LSP路径为LSPG保护下的主路径；若LSPG保护的TE隧道出现异常，确定能够承载当前业务的TE隧道的LSP路径为LSPG保护下的备路径。
场景三：所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，步骤13包括：
步骤133，根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
步骤134，根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
承续上例，所述方法还包括：
步骤15，当承载当前业务的TE隧道的LSP路径出现故障时，根据所述TE隧道的保护组信息进行LSP路径切换；
步骤16，将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
双向链路转发检测BFD等链路检测方法检测到工作路径出故障时，快速的根据相应的保护组信息进行LSP路径切换，然后执行步骤16对所述主TE隧道的隧道信息表进行更新，使得查表时得到的最新的信息。
以下结合图1对本发明实施例进行说明：
假设在L2VPN组网中有两台PE设备(PE设备是指运营商边缘设备)，中间有若干P设备(P设备是指供应商设备)。在PE1和PE2之间建立两条TE隧道，经过不同的物理链路，分别为TE1和TE2。假设有一条VPWS(Virtual Private Wire Service，虚拟专线服务)业务，其伪线承载在隧道TE1上(则TE1为主TE隧道)。在PE1设备上建立隧道保护组TG，其中工作隧道为TE1，TE2为保护TE1的备份隧道。再在PE1上对TE1隧道建立TE FRR(快速路由重建)，如图1所示，对TE1隧道的一段形成LSPG保护，备份LSP路径为隧道TE3。
从PE1设备上，获取VPN相关转发信息、隧道TE1信息以及TG保护组和LSPG保护组信息；将VPN相关转发信息后写业务转发表，并且在转发表中打上TE隧道标识和隧道TE1的索引，表明该VPN业务承载在隧道TE1上；将隧道TE1相关保护信息后进行融合处理，选出正确的出标签和物理出接口等信息，写到TE1隧道的相关表项中，为业务标明正确的路径信息。
1.当图1所示的组网中，初始所有链路都正常的情况下：
判断主隧道TE1有隧道保护组TG，其保护隧道为TE2，并且当前隧道保护组的状态是工作在隧道TE1上；再判断隧道TE1上又形成了TE FRR保护，隧道TE3保护了隧道TE1的一段；进一步判断TE FRR的保护状态是工作在主LSP路径上，最终判断出当前业务承载的路径是TE FRR的主LSP路径；最后根据TE FRR的信息将主LSP路径的转发信息写入隧道TE1索引的隧道信息中。
2.当图1组网中，设备PE1和P之间的TE1隧道出现故障时：
TE FRR会将工作状态切换到备LSP路径TE3隧道上，感知到TE FRR 发生切换后，判断当前TE FRR的有效转发路径是隧道TE3；根据TE FRR的主路径隧道TE1，判断隧道TE1还有个隧道保护组TG，由隧道TE2保护TE1。进一步判断隧道保护组TG当前工作状态是工作在隧道TE1；
综合隧道保护组和TE FRR的工作状态，最终判断当前的工作隧道是隧道TE1，但其出接口、标签等信息为TE FRR的备LSP路径TE3指定；最后将TE FRR的备LSP路径信息写入隧道TE1的隧道信息表中。
3.当隧道1上设备P和PE2之间路径出现故障时
隧道保护组TG会切换到备隧道上，感知到隧道保护组状态切换，判断当前TG保护组的工作状态是隧道TE2；进一步判断隧道TE2上没有其它保护，选取隧道TE，获取隧道TE2转发信息仍然写入隧道TE1的隧道信息表中。
需要说明的是，在此情形中，不论TE FRR状态如何，都不选取TE FRR的主、备路径，因为TE FRR是隧道TE1的FRR，此时隧道TE1已经故障了。
4.只有隧道保护组或者TE FRR的场景：
判断没有嵌套保护，直接根据保护组状态，选取正确的路径；将判断子模块通知的转发信息写入隧道TE1的隧道信息表中。
下面结合图4、图5描述在隧道保护组嵌套TE快速重路由的组网中，TE保护融合的处理流程。下面结合附图对TE保护融合的融合过程做说明：
1.收到LSPG保护组的信息时，首先判断LSPG保护组主隧道上是否嵌套TG保护。
1)若没有嵌套，则直接根据LSPG的工作状态取LSPG保护组的主或者备LSP路径转发信息写LSPG的主隧道信息表；
2)若有嵌套，则需要进一步判断LSPG是否嵌套在隧道保护组的主隧道上；
3)当判断LSPG是嵌套在TG保护组的备隧道上时，直接根据LSPG的工作状态选取主或备LSP路径信息写LSPG的主隧道信息表；
4)当判断LSPG是嵌套在TG保护组的主隧道时，需要进一步判断TG保护组的工作状态；
5)当判断TG当前的工作状态是在备隧道时，TE保护融合模块判定当前主隧道有故障，主隧道上的LSPG保护是失效的，此时不根据LSPG保护组下发的信息写隧道信息表；
6)当判断TG当前的工作状态是在主隧道时，直接根据LSPG的工作状态选取主或备LSP路径信息写LSPG的主隧道信息表；
2.收到TG保护组信息时，先根据隧道保护组的工作状态选择隧道保护组当前工作的隧道，然后进一步判断该隧道上是否嵌套有LSPG保护。
1)若没有LSPG保护，则直接用该隧道的转发信息写隧道信息表；
2)若有LSPG保护，则通知LSPG保护根据其工作状态选择相应的LSP路径信息写TG的主隧道信息表。
为了更好的实现上述目的，如图6所示，本发明实施例还提供一种业务转发表的设置装置，用于为流量工程TE配置保护的网络，所述装置包括：
获取模块61，设置为：获取所述网络的业务转发信息以及TE隧道信息；
与获取模块61连接的第一写入模块62，设置为：将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
与获取模块61连接的路径确定模块63，设置为：根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
与第一写入模块62和路径确定模块63连接的第二写入模块64，设置为：将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
本发明上述实施例中，所述获取模块61包括：
获取子模块，设置为：获取用户配置的TE的业务信息；
第一解析模块，设置为：解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
第二解析模块，设置为：解析所述TE的业务信息，得到TE隧道信息， 所述TE隧道信息包括：TE隧道以及TE隧道的保护组信息。
本发明上述实施例中，当所述主TE隧道仅有隧道保护组时，相应地，所述路径确定模块63包括：
第一确定子模块，设置为：根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
本发明上述实施例中，当所述主TE隧道仅有标签交换路径保护组时，相应地，所述路径确定模块63包括：
第二确定子模块，设置为：根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
本发明上述实施例中，当所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，所述路径确定模块63包括：
第三确定子模块，设置为：根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
第四确定子模块，设置为：根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
本发明上述实施例中，所述装置还包括：
切换模块，设置为：当承载当前业务的TE隧道的LSP路径出现故障时，根据所述TE隧道的保护组信息进行LSP路径切换；
第三写入模块，设置为：将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
需要说明的是，本发明实施例的业务转发表的设置方法中，无论承载当前业务的TE隧道上是否配置保护组，查完业务转发表后，直接查TE隧道信息表即可获得下一跳出口及出口标签等信息，不用再继续查隧道保护组或标签交换路径保护组的相关表项，提高了转发效率；同时只要配置的承载业务的主TE隧道不变，业务转发表就不需要更新表中的索引信息，降低了系统CPU的开销。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计 算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
本发明实施例的业务转发表的设置方法及装置中，无论承载当前业务的TE隧道上是否配置保护组，在查完业务转发表后，直接查TE隧道信息表即可获得下一跳出口及出口标签等信息，可以不用再继续查隧道保护组或标签交换路径保护组的相关表项，由此提高了转发效率；同时只要配置的承载业务的主TE隧道不变，业务转发表就不需要更新表中的索引信息，由此降低了系统CPU的开销。

Claims (13)

  1. 一种业务转发表的设置方法，用于为流量工程TE配置保护的网络，所述设置方法包括：
    获取所述网络的业务转发信息以及TE隧道信息；
    将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
    根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
    将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
  2. 根据权利要求1所述的业务转发表的设置方法，其中，所述获取所述网络的业务转发信息以及TE隧道信息，包括：
    获取用户配置的TE的业务信息；
    解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
    解析所述TE的业务信息，得到TE隧道信息，所述TE隧道信息包括：TE隧道以及TE隧道的保护组信息。
  3. 根据权利要求1所述的业务转发表的设置方法，其中，当所述主TE隧道仅有隧道保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径，包括：
    根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
  4. 根据权利要求1所述的业务转发表的设置方法，其中，当所述主TE隧道仅有标签交换路径保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径 LSP路径，包括：
    根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
  5. 根据权利要求1所述的业务转发表的设置方法，其中，当所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，所述根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径，包括：
    根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
    根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
  6. 根据权利要求1所述的业务转发表的设置方法，还包括：
    当承载当前业务的TE隧道的LSP路径出现故障时，根据所述TE隧道的保护组信息进行LSP路径切换；
    将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
  7. 一种业务转发表的设置装置，用于为流量工程TE配置保护的网络，包括：
    获取模块，设置为：获取所述网络的业务转发信息以及TE隧道信息；
    第一写入模块，设置为：将所述业务转发信息写入业务转发表，并在所述业务转发表中为承载业务的主TE隧道设置标识和索引；
    路径确定模块，设置为：根据所述TE隧道信息中所述主TE隧道的保护组信息，确定能够承载当前业务的TE隧道的标签交换路径LSP路径；
    第二写入模块，设置为：将所述TE隧道的LSP路径的下一跳出口及出口标签写入设置有所述索引的主TE隧道的隧道信息表中。
  8. 根据权利要求7所述的业务转发表的设置装置，其中，所述获取模块包括：
    获取子模块，设置为：获取用户配置的TE的业务信息；
    第一解析模块，设置为：解析所述TE的业务信息，得到业务转发信息，所述业务转发信息包括：承载业务的主TE隧道；
    第二解析模块，设置为：解析所述TE的业务信息，得到TE隧道信息，所述TE隧道信息包括：TE隧道以及TE隧道的保护组信息。
  9. 根据权利要求7所述的业务转发表的设置装置，其中，当所述主TE隧道仅有隧道保护组时，相应地，所述路径确定模块包括：
    第一确定子模块，设置为：根据所述隧道保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
  10. 根据权利要求7所述的业务转发表的设置装置，其中，当所述主TE隧道仅有标签交换路径保护组时，相应地，所述路径确定模块包括：
    第二确定子模块，设置为：根据所述标签交换路径保护组的工作状态确定能够承载当前业务的TE隧道的LSP路径。
  11. 根据权利要求7所述的业务转发表的设置装置，其中，当所述主TE隧道有隧道保护组嵌套标签交换路径保护组时，相应地，所述路径确定模块包括：
    第三确定子模块，设置为：根据所述隧道保护组的工作状态确定承载当前业务的TE隧道；
    第四确定子模块，设置为：根据承载当前业务的所述TE隧道上的所述标签交换路径保护组的工作状态，确定能够承载当前业务的TE隧道的LSP路径。
  12. 根据权利要求7所述的业务转发表的设置装置，还包括：
    切换模块，设置为：当承载当前业务的TE隧道的LSP路径出现故障时，根据所述TE隧道的保护组信息进行LSP路径切换；
    第三写入模块，设置为：将切换后的LSP路径的下一跳出口及出口标签，写入设置有所述索引的主TE隧道的隧道信息表中。
  13. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1-6任一项的方法。
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