CN102546443B - Distributed policy routing method - Google Patents

Distributed policy routing method Download PDF

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CN102546443B
CN102546443B CN 201210079818 CN201210079818A CN102546443B CN 102546443 B CN102546443 B CN 102546443B CN 201210079818 CN201210079818 CN 201210079818 CN 201210079818 A CN201210079818 A CN 201210079818A CN 102546443 B CN102546443 B CN 102546443B
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policy
routing
port
joint
peer
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CN 201210079818
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CN102546443A (en
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顾军
吴响
郝允领
宋岳龙
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徐州中矿大华洋通信设备有限公司
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Abstract

本发明公开了一种分布式策略路由的方法,涉及数据通信领域。 The present invention discloses a distributed routing strategy method relates to data communications. 该方法将策略路由设备的接口分成内部端口、外部端口和联合端口三种类型的端口;内部端口对进来的数据包进行策略选择;外部端口用来转发实际数据包,按需要选择是否使用NAT/PAT;联合端口用来发送自身策略路由配置信息,接收对方策略路由配置信息,转发对等体策略路由数据包,通过修改从联合端口收到的对等体的策略路由信息,将需要对方进行策略路由的数据包从联合端口发送,对等体收到数据包后进行本地策略路由选择,实现联合端口间策略路由配置信息的交换与重配置过程和实际数据包的传输流程。 The method policy routing device interface into an internal port, the external port and the joint port three types of ports; internal port of the incoming packet selection policy; actual external port for forwarding packets according to select whether to use NAT / the PAT; joint port used to send configuration information for their own routing policy, the other policy routing configuration information received, the peer forwarding policy routing packets, by modifying the routing policy information and the like received from the joint port body, the other party will need to be policy routing packets from the joint port, local policy routing data packets after receiving peer, policy-based routing and exchange configuration of a transmission process of the reconfiguration process information and actual data packets between the joint port. 优点是:减少网络管理者的配置负担,增加策略路由的可靠性。 Advantages are: to reduce the burden of network administrators to configure and increase the reliability of routing strategies.

Description

一种分布式策略路由的方法 A distributed policy-based routing method

技术领域 FIELD

[0001] 本发明涉及数据通信领域,具体是一种分布式策略路由的方法。 [0001] The present invention relates to data communications, in particular to a method of distributed routing strategy.

背景技术 Background technique

[0002] 在企业网络构建过程中,经常会出现网络多出口的情况,即企业网络连接到了多个ISP(英特网服务提供商)中,在这种情况下,最常使用到的方法是使用策略路由。 [0002] In the process of building enterprise networks, it would often multi-outlet network, that the enterprise network is connected to multiple ISP (Internet service provider), under this scenario, the most commonly used method is to PBR. 策略路由是一种比基于目标网络进行路由更加灵活的数据包路由转发机制。 PBR is a routing more flexible than the packet routing forwarding mechanism based on the target network. 通过策略路由,网络边界设备通过管理者事先设计好的策略进行转发数据包,而非通过路由表,这种方式大大增加了管理者对网络的控制能力,将过去的最短路径优先考虑的方式,转化为通过实际需求进行转发数据的方式。 Through policy-based routing, network edge devices designed to advance through good management strategy to forward packets, rather than through the routing table, in this way greatly increases the ability to control network managers, way past Shortest Path First consideration, converted to forward data by way of the actual demand. 传统的策略路由大多依据以下几种方式进行策略设定:通过目标IP地址进行策略设定;通过源IP地址进行策略设定;通过源IP地址和目标IP地址进行策略设定。 The traditional policy-based routing mostly carried out in accordance with the policy set in the following ways: carry out the policy set by the destination IP address; for policy set by source IP address; for policy set by the source IP address and destination IP address.

[0003] 但是对于大中型企业网络,边界网关设备可能会出现多台,例如以下几种情况: [0003] However, for medium and large enterprise networks, border gateway device may appear more than one, for example, the following situations:

[0004] ( I)为了防止单台设备故障。 [0004] (I) in order to prevent a single equipment failure.

[0005] (2)单台设备端口不够用。 [0005] (2) a single-port device is not enough.

[0006] (3)网络负载过大,超过单台设备的性能。 [0006] (3) the network load is too large, the performance of more than a single piece of equipment.

[0007] (4)现有网络由多个网络合并而成。 [0007] (4) an existing network the network formed by a plurality of combined.

[0008] 对于企业中存在多台边界网关设备,会出现以下两种情况:第一种,单台设备完全实现策略路由,所有策略在本地可以完成,不需要另外的设备做出口策略;第二种,单台设备的出口策略需要另外边界设备做出口。 [0008] For multiple border gateway doing business, there will be the following two situations: the first, a single device fully implement policy-based routing, all policies can be done locally, no additional equipment to do exit strategy; second species, a single piece of equipment export strategy requires additional equipment boundary export. 第一种情况由于不需要设备之间进行策略交互,实现起来非常容易,第二种情况传统的解决方式是在各个边界设备中策略的末尾处加入指向其他边界设备的策略,并且需要设置设备间路由,这种方式需要网络管理者详细考虑网内路由和每台设备中的策略路由,实现起来相对繁琐。 The first case as a result of the interaction between the policy does not require equipment, and is very easy, the second case the traditional solution is to add links to other edge devices at the end of the policy strategies in various edge devices, and between devices needs to be set routing, this approach requires network managers to consider in detail the routing and policy routing network for each device, relatively cumbersome to implement.

发明内容 SUMMARY

[0009] 为了克服上述现有技术的缺点,本发明提供一种分布式策略路由方法,通过将分散的策略路由设备通过物理线路进行相连,设备间建立策略路由邻居关系,相互交换策略路由,减少网络管理者的配置负担,使网络管理者专注于策略设计本身,而非路由选择和不同设备之间多余的策略选择,这种方式可以有效的增加策略路由的可靠性,将传统的只能通过相互路由实现的分布式策略路由以联合端口的方式内部实现。 [0009] In order to overcome the above disadvantages of the prior art, the present invention provides a method of distributed routing strategies, performed by the physical line is connected by dispersing device policy routing, policy routing neighbor relationship established between devices, policy routing exchange to reduce Configuring the burden of network administrators, network managers to focus on the policy design itself, rather than routing the excess policy options and choose between different devices, this approach can effectively increase the reliability of routing strategies, only through traditional distributed routing policy routing each other to achieve internal implementation to joint port way.

[0010] 本发明是以如下技术方案实现的:一种分布式策略路由方法,将策略路由设备的接口分成内部端口、外部端口和联合端口三种类型的端口; [0010] The present invention is based on the following technical solution: a distributed policy routing method, the policy routing device interface into an internal port, the external port and the joint port three types of ports;

[0011] 内部端口对进来的数据包进行策略选择; [0011] internal port of the incoming packet selection policy;

[0012] 外部端口用来转发实际数据包,按需要选择是否使用NAT/PAT ; [0012] The actual external port for forwarding packets according to need to choose whether to use the NAT / PAT;

[0013] 联合端口用来发送自身策略路由配置信息,接收对方策略路由配置信息,转发对等体策略路由数据包,通过修改从联合端口收到的对等体的策略路由信息,将需要对方进行策略路由的数据包从联合端口发送,对等体收到数据包后进行本地策略路由选择; [0013] United ports used to send its own routing policy configuration information, receiving the other policy routing configuration information, forwarding peer policy routing packets, by modifying the routing policy information and the like received from the joint port body, the other party will need to be policy routing packets from the joint port, local policy routing data packets after receiving peer;

[0014] 分散的策略路由设备的联合端口通过物理线路进行相连,设备间建立策略路由邻居关系,相互交换策略路由,实现联合端口间策略路由配置信息的交换与重配置过程和实际数据包的传输流程。 [0014] Joint port decentralized policy routing device is connected via a physical line, established policy routing neighbor relationship between devices, exchange policy routing, policy-based routing configuration of the transmission switching and reconfiguration process information and actual data packets between the joint port Process.

[0015] 其进一步是:所述联合端口间策略路由配置信息的交换与重配置过程具体步骤如下: [0015] is further: the joint port disposed between the PBR and the step of exchanging specific information reconfiguration procedure is as follows:

[0016] ( I)通过交换hello包建立邻居关系; [0016] (I) neighbor establishment exchanging hello packets;

[0017] (2)将本设备中配置的策略路由信息发送到对方; [0017] (2) The transmission apparatus according to the present policy routing configuration information to the other;

[0018] (3)对等体将收到的策略路由信息配置信息中的出接口修改成联合端口,并将其插入到现有本地路由策略的尾部; [0018] (3) the peer routing policy information received configuration information into the joint port interface modification, and insert it into the tail of an existing local routing policy;

[0019] (4)对等体向对方发送确认包。 [0019] (4) to the other peer sends acknowledgment packets.

[0020] 实际数据包的传输流程包括以下步骤: [0020] The actual packet transmission procedure comprises the steps of:

[0021] (I)边界策略路由设备从内部接口收到数据包; [0021] (I) border PBR device interface receives the packet from the inside;

[0022] (2)查找本地策略路由,若在本地策略路由数据库中没有找到匹配的策略,则执行步骤(3),若找到相应的策略,则执行步骤(4); [0022] (2) Find local routing policy, if the policy matches the local policy is not found in the routing database, the step (3), if the corresponding policy found, the step (4);

[0023] (3)根据路由表中的路由表项路由数据包; [0023] (3) The packet routing data routing entries in the routing table;

[0024] (4)若策略的出接口为本地接口,则直接发送数据包,若策略的出接口为联合端口,执行步骤(5); [0024] (4) if a local policy interface to interface to send packets directly, if the policy for the joint port interfaces, step (5);

[0025] (5)判断联合端口的状态为down,则执行步骤(3),若联合端口的状态为up,则将此数据包发送给指定对等体; [0025] (5) determines the state of the joint port is down, the step (3), when the combined state of the port is up, then this packet is sent to the peer;

[0026] (6)对等体根据本地路由策略转发数据包。 [0026] (6) a peer forwards the packet according to a local routing policy.

[0027] 本发明的有益效果是:减少网络管理者的配置负担,使网络管理者专注于策略设计本身,而非路由选择和不同设备之间多余的策略选择,这种方式可以有效的增加策略路由的可靠性,将传统的只能通过相互路由实现的分布式策略路由以联合端口的方式内部实现。 [0027] Advantageous effects of the present invention are: to reduce the burden on the network administrator configured the network management strategy focused on the design itself, rather than routing selection between redundant selection policy and different devices in this way can effectively increase strategy routing reliability, the traditional distributed routing strategy can only be achieved through mutual co-routed to port the way the internal implementation.

附图说明 BRIEF DESCRIPTION

[0028] 下面结合附图对本发明作进一步说明。 [0028] The following drawings in conjunction with the present invention will be further described.

[0029] 图1为发明中策略路由设备各种端口的具体分类; [0029] FIG. 1 is a disclosure policy routing device specific classification of various ports;

[0030] 图2为联合端口间策略路由配置信息的交换与重配置过程; [0030] FIG. 2 is a joint between ports policy routing switching information to the reconfiguration procedure;

[0031] 图3为策略路由设备收包后的处理流程图。 [0031] FIG. 3 process flow diagram of the device after receiving the packet routing policy.

具体实施方式 Detailed ways

[0032] 如图1所不,一种分布式策略路由方法,将策略路由设备的接口分成部端口、夕卜部端口和联合端口三种类型的端口。 [0032] FIG. 1 is not a method of distributed policy routing, policy routing interface device into a port portion, the port and the joint portion Bu Xi port three types of ports. 为了使设备在运作过程中,能够区分各个接口不同的作用,并根据接口的职能做相应的处理,每个接口的具体作用如下: In order to make the device during operation, it is possible to distinguish the role of different respective interfaces, and corresponding processing functions in accordance with the interface, the specific role of each interface is as follows:

[0033] 内部端口:从内部端口进入的数据包,会触发策略路由的查找,参照图1,当数据包从Routerl的内部端口进入后,查找策略路由数据库,策略路由数据库和传统策略路由数据库一致,都是从上到下逐行查询,若经查找后的出接口为接到ISPl或者ISP2的外部端口,则数据包直接发送,如果此数据包的出口在Router2的外部端口(连接到ISP3或ISP4),则策略路由中的出接口为联合接口,此数据包会通过联合接口发送到Router2。 [0033] Internal Port: from the interior of the port into the data packet, triggered find routing strategy, with reference to FIG. 1, when the packet enters from the inside Routerl port for a policy routing database consistent policy routing database and traditional policy routing database , line by line from top to bottom are a query, if the interface to find out via ISPl ISP2 or external port, the data packets directly transmitted, this packet if the outlet at the external port of Router2 (or connected to the ISP3 ISP4 outbound interface), the policy routing is from the joint interface to the data packets are sent through the joint Router2 interface.

[0034] 外部端口:外部端口为数据包的出端口,当数据包从内部端口流经到外部端口时,根据需要可以设置NAT/PAT,同样,当数据包从外部端口流入时,也会查询相应的NAT/PAT,这个功能和传统策略路由和NAT/PAT结合的方式一致。 [0034] The external ports: External packet port egress port when a packet flows through the port from the interior to the external port, may be provided according to need NAT / PAT, similarly, when a packet flows into the port from the outside, also poll the corresponding NAT / PAT, consistent with this feature and traditional policy routing and NAT / PAT binding way.

[0035] 联合端口:联合端口主要完成三个方面的作用。 [0035] Joint Port: The port mainly to complete the joint action of three aspects. 第一,将本地策略路由信息发送给对等体,更新对等体的策略路由数据库;第二,接受对方发送的策略路由信息,将收到的策略路由信息中出接口改成联合端口,追加到本地策略路由数据库中;第三,转发实际数据包到对等体,让邻居完成数据包的分布式策略路由。 First, local policy routing information is sent to the peer, update the policy routing database peers; second, to accept the policy routing information sent by the other party, policy routing the received information into a joint port interfaces, additional to local policy routing database; third, the actual packet forwarding to peers, so that the neighbors complete distributed policy routing packets.

[0036] 分散的策略路由设备的联合端口通过物理线路进行相连,设备间建立策略路由邻居关系,相互交换策略路由,实现联合端口间策略路由配置信息的交换与重配置过程和实际数据包的传输流程。 [0036] Joint port decentralized policy routing device is connected via a physical line, established policy routing neighbor relationship between devices, exchange policy routing, policy-based routing configuration of the transmission switching and reconfiguration process information and actual data packets between the joint port Process.

[0037] 如图2所示,通过相互交换与重配置对方策略路由,可以减少网络管理员的配置负担,使其专注于策略本身。 [0037] As shown in FIG 2, by exchange with other reconfiguration policy routing can reduce the burden on the network administrator's configuration, it focuses on policies themselves. 联合端口间策略路由配置信息的交换与重配置过程具体步骤如下: DETAILED exchange reconfiguration process between step joint port policy routing configuration is as follows:

[0038] (I)通过交换hello包建立邻居关系; [0038] (I) neighbor establishment exchanging hello packets;

[0039] (2)将本设备中配置的策略路由信息发送到对方; [0039] (2) The transmission apparatus according to the present policy routing configuration information to the other;

[0040] (3)对等体将收到的策略路由配置中信息的出接口修改成联合端口,并将其插入到现有本地路由策略的尾部; [0040] (3) the peer routing policy information in the received configuration changed interfaces to the joint port, and insert it into the tail of an existing local routing policy;

[0041] (4)对等体向对方发送确认包。 [0041] (4) to the other peer sends acknowledgment packets.

[0042] 实际数据包的传输流程包括以下步骤: [0042] The actual packet transmission procedure comprises the steps of:

[0043] (I)边界策略路由设备从内部接口收到数据包; [0043] (I) border PBR device interface receives the packet from the inside;

[0044] (2)查找本地策略路由,若在本地策略路由数据库中没有找到匹配的策略,则执行步骤(3),若找到相应的策略,则执行步骤(4); [0044] (2) Find local routing policy, if the policy matches the local policy is not found in the routing database, the step (3), if the corresponding policy found, the step (4);

[0045] (3)根据路由表中的路由表项路由数据包; [0045] (3) The packet routing data routing entries in the routing table;

[0046] (4)若策略的出接口为本地接口,则直接发送数据包,若策略的出接口为联合端口,执行步骤(5); [0046] (4) if a local policy interface to interface to send packets directly, if the policy for the joint port interfaces, step (5);

[0047] (5)判断联合端口的状态为down,则执行步骤(3),若联合端口的状态为up,则将此数据包发送给指定对等体; [0047] (5) determines the state of the joint port is down, the step (3), when the combined state of the port is up, then this packet is sent to the peer;

[0048] (6)对等体根据本地路由策略转发数据包。 [0048] (6) a peer forwards the packet according to a local routing policy.

[0049] 针对策略路由设备,在接收到数据包后会判断自身属于哪种类型的端口,然后执行相应的职能,图3为策略路由设备收包后的处理流程图,具体步骤如下: [0049] The apparatus for routing policy, after receiving the packet determines which type of port the own station belongs, and then perform a corresponding function, FIG 3 is a flowchart showing the processing equipment after receiving the packet routing strategy, the following steps:

[0050] (I)收到数据包; [0050] (I) the received data packet;

[0051] (2)判断收到数据包的接口是否为外部端口,如果是,进入步骤(3),如果不是,进入步骤(4); Interface [0051] (2) determines whether the received packet is the external port, if yes, proceeds to step (3), if not, go to step (4);

[0052] (3)通过路由表转发数据包; [0052] (3) forwards the packet through the routing table;

[0053] (4)判断收到数据包的接口是否为联合端口,如果是,进入步骤(5)。 Interface [0053] (4) determines whether the received packet is combined port, if yes, proceeds to step (5). 如果不是,进入步骤(6); If not, go to step (6);

[0054] (5)查找本地策略路由数据库,依据策略路由转发数据; [0054] (5) Find a local policy routing database, data forwarding based policy routing;

[0055] (6)查找本地策略路由数据库,进入步骤7 ; [0055] (6) Find a local policy routing database, proceed to step 7;

[0056] (7)判断是否有匹配的策略,如果没有,进入步骤(8),如果有,进入步骤(9); [0056] (7) determines whether a matching policy, and if not, proceeds to step (8), and if so, proceeds to step (9);

[0057] (8)通过路由表转发数据包; [0057] (8) forward packets by the routing table;

[0058] (9)判断出接口是否为外部端口,如果是,进入步骤(10),如果不是,进入步骤 [0058] (9) the interface is judged whether the external port, if yes, proceeds to step (10), if not, proceeds to step

(11); (11);

[0059] (10)转发数据包; [0059] (10) forward packets;

[0060] (11)判断联合端口是否为up状态,如果是,进入步骤(12),如果不是,进入步骤 [0060] (11) determines whether the port is up joint state, if yes, proceeds to step (12), if not, proceeds to step

(8); (8);

[0061] (12)转发到相应对等体。 [0061] (12) forwarded to the respective peers.

Claims (1)

1.一种分布式策略路由方法,其特征在于:将策略路由设备的接口分成内部端口、夕卜部端口和联合端口三种类型的端口; 内部端口对进来的数据包进行策略选择; 外部端口用来转发实际数据包,按需要选择是否使用NAT/PAT ; 联合端口用来发送自身策略路由配置信息,接收对方策略路由配置信息,转发对等体策略路由数据包,通过修改从联合端口收到的对等体的策略路由信息,将需要对方进行策略路由的数据包从联合端口发送,对等体收到数据包后进行本地策略路由选择; 分散的策略路由设备的联合端口通过物理线路进行相连,设备间建立策略路由邻居关系,相互交换策略路由,实现联合端口间策略路由配置信息的交换与重配置过程和实际数据包的传输流程; 联合端口间策略路由配置信息的交换与重配置过程具体步骤如下: (1)通过交换hello包建立 A method of distributed policy-based routing, wherein: the device interface into an internal policy routing port, and the port portion Bu Xi joint port three types of ports; internal port of the incoming packet selection policy; external port with forwarding the packet to the actual data, as needed to select whether to use NAT / PAT; joint port used to send configuration information for their own routing policy, the other policy routing configuration information received, the peer forwarding policy routing packets received from the joint interface by modifying policy routing information of the peer will require other policy-based routing of data packets sent from the joint port, local policy routing data packets after receiving peer; dispersion joint port policy routing device is connected via a physical line, between devices establish a policy routing neighbor relationship, exchange policy routing, policy-based routing configuration transmission flow exchange with the reconfiguration process information and actual data packets between the joint port; joint between ports policy routing DETAILED step of exchanging with the reconfiguration process information as follows: (1) by exchanging hello packets establish 居关系; (2)将本设备中配置的策略路由信息发送到对方; (3)对等体将收到的策略路由配置信息中的出接口修改成联合端口,并将其插入到现有本地路由策略的尾部; (4)对等体向对方发送确认包; 实际数据包的传输流程包括以下步骤: (1)边界策略路由设备从内部接口收到数据包; (2)查找本地策略路由,若在本地策略路由数据库中没有找到匹配的策略,则执行步骤(3),若找到相应的策略,则执行步骤(4); (3)根据路由表中的路由表项路由数据包; (4)若策略的出接口为本地接口,则直接发送数据包,若策略的出接口为联合端口,执行步骤(5); (5)判断联合端口的状态为down,则执行步骤(3),若联合端口的状态为up,则将此数据包发送给指定对等体; (6)对等体根据本地路由策略转发数据包。 Habitat relationship; (2) transmits the policy routing configuration of the information present in the device to a counterpart; (3) the peer policy routing the received configuration information into the joint port interface modification, and inserted into the existing local tail routing policy; (4) to the other peer sends acknowledgment packet; actual packet transmission procedure comprises the following steps: (1) the boundary policy routing device receives a packet from the internal interface; (2) Find local routing policy, If the policy match is not found in the local policy routing database, the step (3), if the corresponding policy found, the step (4); (3) according to the routing table of the routing table entries for routing packets; (4 ) If the policy is an interface to a local interface, directly send data packets, if the policy of the interface joint port, step (5); state (5) determines the joint port is down, the step (3), if joint state of the port is up, then this packet is sent to the peer; (6) a peer forwards the packet according to a local routing policy.
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