WO2010094193A1 - 一种以太网保护中协议通道的实现方法 - Google Patents

一种以太网保护中协议通道的实现方法 Download PDF

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Publication number
WO2010094193A1
WO2010094193A1 PCT/CN2009/074591 CN2009074591W WO2010094193A1 WO 2010094193 A1 WO2010094193 A1 WO 2010094193A1 CN 2009074591 W CN2009074591 W CN 2009074591W WO 2010094193 A1 WO2010094193 A1 WO 2010094193A1
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WIPO (PCT)
Prior art keywords
ethernet
protection
protection domain
protocol
node
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PCT/CN2009/074591
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English (en)
French (fr)
Inventor
吴少勇
杨剑
邵宏
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/201,943 priority Critical patent/US20110299388A1/en
Priority to EP09840244.9A priority patent/EP2400697A4/en
Publication of WO2010094193A1 publication Critical patent/WO2010094193A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • H04L12/437—Ring fault isolation or reconfiguration

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for implementing a protocol channel in Ethernet protection.
  • Ethernet network various protection technologies are widely used, that is, when communication is performed in the network, there are multiple communication paths, and redundant backup between the primary communication path and the alternate communication path is realized.
  • the primary path and the alternate path are both intact, the data forwarding function of the alternate path is blocked, and the protected data of the network is transmitted on the primary path; when the primary path fails, the data forwarding function of the alternate path is opened, and the network is protected.
  • the data is switched to the alternate path for transmission, thereby realizing the switching of the network from the normal state of the path to the fault state, thereby improving the network's anti-fault capability.
  • the fast protection switch can be completed only when the protocol frame sent by the node can reach the destination node as soon as possible, preventing the switch time from being too long and causing a large loss of the protected data.
  • the protocol channel in Ethernet protection refers to the physical path or logical path of the Ethernet protection protocol frame transmitted in the Ethernet network, such as the path determined by the protocol VLAN (Virtual Local Area Network), and the protocol MAC (Media Access Control). , medium access control) the address to forward the determined path, etc., so that the Ethernet protection protocol frame can be transmitted along the corresponding path, the path can be blocked or opened.
  • the protection type of the Ethernet is the schematic diagram of the ring network protection; nodes Sl, S2
  • S3, S4, and S5 are nodes that support the Ethernet switching function.
  • the Ethernet ring protection domain includes nodes S1, S2, S3, S4, and S5, and links between the nodes: S5 ⁇ -> Sl, Sl ⁇ -> S2 S2 ⁇ ->S3 and S3 ⁇ ->S4, S4 and S5 are boundary nodes of the Ethernet ring protection domain, and are also interconnection nodes of the Ethernet ring protection domain and other parts of the Ethernet, and are interconnected.
  • a node is a connection node when a protection domain is connected to other networks.
  • the sub-ring is connected to other rings through two interconnection nodes.
  • the Ethernet ring protection domain is also called an Ethernet sub-ring protection domain, or simply a sub-ring. A subset of the entire Ethernet ring.
  • the sub-rings are connected to other parts of the Ethernet ring network through the interconnection nodes S4 and S5.
  • the other parts of the Ethernet ring network may be a single ring or an interconnection structure of a single ring and a sub-ring.
  • a link in the sub-ring is called a ring protection link.
  • the link between the nodes S1 and S2 in FIG. 1 is a ring protection link.
  • the node S2 blocks the ring protection link connected to the port 22 to prevent the protected data from being On the ring protection link, the protected data between nodes has only one path that can communicate.
  • the link in the sub-ring fails, as shown in Figure 2, when the link between the nodes S3 and S4 fails, the sub-ring performs protection switching after the node S3 detects the link failure.
  • Node S3 sends a link failure alarm protocol frame outward. After receiving the link failure alarm protocol frame, node S2 opens the ring protection link connection port 22.
  • the other nodes S1, S2, S3, S4, and S5 also need to refresh the forward address table.
  • the sub-ring After the sub-ring completes the protection switch, since the connected port of the ring protection link is opened, the protected data between the nodes has a new communication path.
  • the reliability of the Ethernet ring network is effectively improved.
  • the protocol frame sent by one node needs to reach other nodes as soon as possible to complete the fast switchover, preventing the switchover time from being too long and causing a large amount of protected data to be lost.
  • the node S3 detects the link fault.
  • the protocol frame cannot reach the nodes S1 and S5 as soon as possible, and the nodes S1 and S5 cannot refresh the forward address table, and the entire protection switch cannot be fast. Completion, resulting in a long switching time, and even a large amount of protected data is lost.
  • the protocol channel itself will form a closed loop, and the frames in the protocol channel may continue to be cyclically transmitted, causing network storms.
  • the protection type of the Ethernet is dual-homing protection.
  • the nodes S1, S2, and S3 are nodes that support the Ethernet switching function.
  • the Ethernet dual-homed protection domain is created.
  • the node S1 is interconnected with the network A through the interconnection node S5, and the node S3 is interconnected with the network A through the interconnection node S4, and the interconnection nodes S4 and S5 are capable of transmitting the Ethernet data frame between the dual-homing protection domain and the network A
  • the network A can be Ethernet or a network of other technologies.
  • the Ethernet dual-homing protection domain there is a link called a protection link.
  • the Ethernet dual-homed protection link is intact, at least one of the node ports connected to the protection link is blocked. Prevent the protected data from passing through the link.
  • the link between nodes S1 and S2 is a protection link.
  • node S2 blocks the protection chain.
  • the road is connected to port 22 to prevent protected data from being transmitted on the protection link.
  • Double return When the link in the guardian domain fails, for example, in Figure 4, when the link between the nodes S3 and S4 fails, after the node S3 detects the link fault, the Ethernet dual-homed protection domain performs protection switching, and the node S3 directions After sending the link failure alarm protocol frame, the node S2 opens the protection link connection port 22 after receiving the link failure alarm protocol frame, and the nodes S1, S2, and S3 also need to refresh the forward address table, in the Ethernet dual-homed protection domain.
  • Ethernet dual-homing protection technology effectively improves the reliability of the Ethernet dual-homing network.
  • the protocol frame sent by one node needs to reach other nodes as soon as possible to complete the fast handover, preventing the switch time from being too long and causing a large amount of protected data to be lost.
  • node S3 detects the link.
  • the protocol frame sent when the link fails may be discarded, and the protocol frame cannot reach the destination node as soon as possible, so that the protection switching cannot be completed quickly, or the switching time is over. Long, even a large amount of protected data is lost, and it is also possible that network storms are caused by the continuous cyclic transmission of protocol frames in a closed-loop protocol channel.
  • the technical problem to be solved by the present invention is to provide a method for implementing a protocol channel in Ethernet protection.
  • the present invention enables an Ethernet protection protocol frame to reach a destination node as soon as possible, and prevents an Ethernet protection protocol channel from forming a closed loop. Network storm.
  • the invention discloses a method for implementing a protocol channel in an Ethernet protection, where the method is: setting a blocking point of a protocol channel in a protection domain of an Ethernet; in the protection domain, the protocol channel is according to the blocking point
  • the type remains open or on or off in sync with the protected data channel in the protection domain.
  • the protection domain is an Ethernet dual-homed protection domain. If the protection domain is an Ethernet ring protection domain, the blocking point of the protocol channel is an interconnection node port of the Ethernet ring protection domain and/or a node port of the Ethernet ring protection domain used to open or block the protected data channel. If the protection domain is an Ethernet dual-homed protection domain, the blocking point of the protocol channel is the interconnection node port of the Ethernet dual-homing protection domain.
  • the protocol channel remains open; if the blocking point is an Ethernet ring protection domain
  • the node port used to open or block the protected data channel the protocol channel is kept open or blocked in synchronization with the protected data channel.
  • the protocol channels also have connectivity in other portions of the Ethernet.
  • a protocol channel is configured between the blocking point of the Ethernet dual-homing protection domain and the border node port of the Ethernet dual-homing protection domain, the protocol channel remains blocked.
  • the protocol channel has at least one blocking point.
  • the present invention enables at least one blocking point on the protocol channel in the protection domain of the Ethernet, and ensures that the protocol channel is in an open state when the link is faulty, preventing the Ethernet protection protocol channel from forming a closed loop and causing network storm, and making the protocol The frame can reach the destination node as soon as possible to achieve the purpose of fast switching, thereby greatly improving the performance of the network.
  • Figure 1 is a schematic diagram of the protection of the Ethernet ring network
  • FIG. 2 is a schematic diagram of protection switching after a link failure occurs in FIG. 1;
  • FIG. 3 is a schematic diagram of Ethernet dual-homing protection
  • FIG. 4 is a schematic diagram of protection switching after a link failure occurs in FIG. 3;
  • FIG. 4 is a schematic diagram of protection switching after a link failure occurs in FIG. 3;
  • Figure 5 is a flow chart of the method of the present invention.
  • FIG. 6 is a schematic diagram of Embodiment 1 of the method of the present invention.
  • Figure 8 is a schematic illustration of a third embodiment of the method of the present invention. Preferred embodiment of the invention
  • FIG. 5 it is an overall flowchart of the method of the present invention, including:
  • Step 501 Create a protocol channel for transmitting an Ethernet protection protocol frame according to a protocol VLAN or a MAC address.
  • the Ethernet ring can be used to transmit Ethernet ring protection protocol frames on the sub-ring.
  • Step 502 Set a blocking point of the protocol channel in the protection domain of the Ethernet;
  • the blocking point is to prevent the Ethernet protection protocol channel from forming a closed loop, which causes the protocol frame to form a network storm.
  • the protection domain is an Ethernet ring protection domain; if the protection type of the Ethernet is dual-homing protection, the protection domain is an Ethernet dual-homed protection domain.
  • the protocol channel has at least one blocking point; if the protection domain is an Ethernet ring protection domain, the blocking point of the protection channel is an interconnection node port of the Ethernet ring protection domain and/or an Ethernet ring protection domain for opening or Blocking the node port of the protected data channel; if the protection domain is an Ethernet dual-homed protection domain, the blocking point of the protection channel is the interconnect node port of the Ethernet dual-homing protection domain.
  • Step 503 Determine the type of the blocking point, if it is the interconnecting node port of the Ethernet ring protection domain or the interconnecting node port of the Ethernet dual-homing protection domain, go to step 504; if it is used in the Ethernet ring protection domain Or blocking the node port of the protected data channel, step 505;
  • Step 504 The Ethernet protection protocol channel remains open
  • Step 505 The Ethernet protection protocol channel is kept open or blocked in synchronization with the protected data channel.
  • the protection type of the Ethernet is ring network protection, and has a ring protection link
  • the 22 port of the node S2 is The blocked node port of the ring protection link
  • the blocking point of the protocol channel is set to the interconnected node port S4, S5 of the Ethernet ring protection domain
  • the protocol of the Ethernet ring protection domain in the Ethernet ring protection domain The sub-ring port of the interconnecting node S4 and the sub-ring port of the S5 are always blocked, and the other node ports of the Ethernet ring protection domain remain open.
  • the node S2 When the link of the Ethernet ring protection domain is normal, the node S2 is blocked. Port 22, that is, the ring protection link of the Ethernet ring protection domain is blocked, the protected data cannot pass through the port, but the Ethernet protection protocol frame can pass through the port, that is, the Ethernet protection protocol channel is opened on the port. status. Therefore, when the link between the nodes S3 and S4 fails, the node S3 sends a link failure alarm protocol frame after detecting the link failure, because the Ethernet protection protocol channel is open at the port 22 of the node S2. Therefore, the protocol frame can be transmitted through the port and reach other nodes of the Ethernet ring protection domain as soon as possible, which ensures fast protection switching of the Ethernet ring network.
  • FIG. 7 it is a schematic diagram of Embodiment 2 of the method of the present invention.
  • a blocking point of a protocol channel is set as a node port used to open or block a protected data channel in an Ethernet ring protection domain, that is, The node S2 in the figure, and the Ethernet ring protection domain and the other parts of the Ethernet ring network have connectivity, which can form a closed loop.
  • node S2 blocks port 22, that is: protected data cannot pass through the port, and Ethernet protection protocol frames cannot pass through the port.
  • the nodes S3 and S4 send a link failure alarm protocol frame after detecting the link failure, because the Ethernet protection protocol channel is blocked at the port 22 of the node S2. Status, the port is opened after receiving the protocol frame sent by S3, and it takes time to open the port, so the protocol frame received before opening will be discarded, so the protocol frame sent by node S3 can reach node S2 quickly.
  • nodes S1 and S5 cannot be reached quickly, but because the Ethernet ring protection domain forms a closed loop with other parts of the Ethernet ring network, that is, Ethernet protection protocol frames can be transmitted in other parts of the Ethernet ring network, and one of the Ethernet ring protection domains
  • the protocol frame sent by the node can be transmitted to other nodes of the Ethernet ring protection domain through other parts of the Ethernet ring network, so the node S4 sends a link failure alarm protocol frame to the other part of the Ethernet ring network to quickly reach the node S5 and S1, that is, the protocol channel also has connectivity in other parts of the Ethernet ring network, and each of the Ethernet ring protection domains
  • the node can receive the Ethernet ring protection protocol frame as soon as possible to complete the fast protection switching.
  • the protection type of the Ethernet is dual-homing protection, that is, the protection domain is an Ethernet dual-homing protection domain, due to the Ethernet
  • the network dual-homing protection domain is connected to other networks, Ethernet protection cannot be guaranteed in other networks.
  • the protocol frame can be transmitted in it. Therefore, for the Ethernet dual-homed protection domain, the blocking point of the protocol channel can only be set to the interconnect node port S4 and/or S5 (in this embodiment, the protocol channel has two blocking points).
  • the protocol channel remains open, and is blocked at the boundary link of the Ethernet dual-homed protection domain, ie, between nodes S1 and S5, and nodes S3 and S4
  • the protocol channel is configured between the nodes, and the protocol channel between the nodes S1 and S5 and the protocol channel between the nodes S3 and S4 are blocked.
  • the method of blocking the protocol channel between the nodes S1 and S5 includes: the node 11 is blocked by the port 11 connected to the node S5; or the other port of the node S5 connected to the node S1 is blocked.
  • the protocol channel between nodes S3 and S4 is blocked in the same way as nodes S1 and S5.
  • the Ethernet protection protocol channel is open regardless of whether the port of the protected data channel is blocked. Therefore, when the link between the nodes S3 and S4 fails, the node S3 sends a link failure alarm protocol frame after detecting the link failure, because the Ethernet protection protocol channel is open at the port 22 of the node S2. Therefore, the protocol frame can be transmitted through the port, and each node of the dual-homing domain is reached as soon as possible, which ensures fast protection switching of the Ethernet dual-homing network.
  • the present invention enables at least one blocking point on the protocol channel in the protection domain of the Ethernet, and ensures that the protocol channel is in an open state when the link is faulty, preventing the Ethernet protection protocol channel from forming a closed loop and causing network storm, and making the protocol The frame can reach the destination node as soon as possible to achieve the purpose of fast switching, thereby greatly improving the performance of the network.

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Description

一种以太网保护中协议通道的实现方法
技术领域
本发明涉及通信领域，尤其涉及一种以太网保护中协议通道的实现方法。
背景技术
在以太网络中， 广泛釆用了各种保护技术， 即网络中进行通信时， 存在 多条通信路径， 实现主用通信路径和备用通信路径之间的冗余备份。 当主用 路径和备用路径都为完好时， 阻塞备用路径的数据转发功能， 网络的被保护 数据在主用路径上传输； 当主用路径发生故障时， 打开备用路径的数据转发 功能， 网络的被保护数据切换到备用路径上传输， 从而实现网络在路径正常 状态到故障状态下的切换， 提高网络的抗故障能力。 在以太网保护技术中， 只有当节点发出的协议帧能够尽快的到达目的节点，才能完成快速保护切换， 防止切换时间过长导致被保护数据大量丟失。 以太网保护中的协议通道是指 在以太网络中传输以太网保护协议帧的物理路径或者逻辑路径， 例如由协议 VLAN ( Virtual Local Area Network, 虚拟局域网）确定的路径、 对协议 MAC ( Media Access Control, 介质访问控制）地址进行转发确定的路径等， 使得 以太网保护协议帧可以沿着相应的路径进行传输， 所述路径可被阻塞或者打 开。
如图 1所示，为以太网的保护类型为环网保护时的示意图； 节点 Sl、 S2、
S3、 S4和 S5为支持以太网交换功能的节点， 以太环网保护域包括节点 Sl、 S2、 S3、 S4和 S5, 以及节点之间的链路： S5〈―〉 Sl、 Sl<―〉 S2、 S2< - >S3 和 S3< - >S4, S4、 S5为所述以太环网保护域的边界节点， 同时也是所述以 太环网保护域与以太网其他部分连接的互连节点， 互连节点即为一个保护域 连接到其他网络时的连接节点， 子环通过两个互连节点连接在其他环上， 以 太环网保护域也称为以太网子环保护域， 或者简称子环， 是整个以太环网中 的一个子集部分。 所述子环通过互连节点 S4和 S5与以太环网的其他部分连 接， 这以太环网的其他部分可以为单环， 也可以为单环和子环的互连结构。 在子环中有一条链路称为环保护链路， 当子环链路都为完好时， 该环保护链 路的相连两个端口中至少一个端口被阻塞， 防止被保护数据从该链路通过， 例如图 1中节点 S1和 S2之间的链路为环保护链路， 当子环中的链路都为完 好时， 节点 S2阻塞了环保护链路相连端口 22, 防止被保护数据在环保护链 路上传输， 节点之间的被保护数据只有一条可以通信的路径。 当子环中的链 路出现故障时， 如图 2所示， 节点 S3和 S4之间的链路出现故障时， 节点 S3 检测到链路故障后， 子环进行保护切换。 节点 S3向外发送链路故障告警协议 帧， 节点 S2收到链路故障告警协议帧后打开环保护链路相连端口 22, 另外 节点 Sl、 S2、 S3、 S4和 S5还需要刷新前向地址表， 在子环完成保护切换后， 由于环保护链路的相连端口被打开，节点之间被保护数据有了新的通信路径。 通过以太环网保护技术， 有效的提高了以太环网的可靠性。 以太环网保护切 换中， 一个节点发送的协议帧需要尽快的到达其他节点， 才能完成快速切换， 防止切换时间过长导致被保护数据大量丟失， 例如图 2中， 节点 S3在检测到 链路故障后立即发送的链路故障告警协议帧若被节点 S2的阻塞端口丟弃，则 该协议帧无法尽快的到达节点 S1和 S5 , 节点 S1和 S5就无法刷新前向地址 表， 整个保护切换不能快速完成， 导致切换时间过长， 甚至被保护数据大量 丟失。 另外， 如果以太环网保护的协议通道上没有阻塞的节点端口， 则协议 通道本身会形成闭环，协议通道中的帧可能会持续循环的传输导致网络风暴。
如图 3所示， 为以太网的保护类型为双归保护时的示意图； 节点 Sl、 S2 和 S3为支持以太网交换功能的节点，创建以太网双归保护域， 以太网双归保 护域包括节点 Sl、 S2和 S3 , 以及节点之间的链路： S5< - >S1、 Sl< - >S2、 S2< - >S3和 S3< - >S4, Sl、 S3为所述以太网保护域的边界节点，而节点 S4、 S5为所述以太网保护域与网络 A连接的互连节点。 节点 S1通过互连节点 S5 与网络 A互连， 节点 S3通过互连节点 S4与网络 A互连， 互连节点 S4和 S5 能够传输双归保护域和网络 A之间的以太网数据帧， 网络 A可以为以太网， 也可以为其他技术的网络。在以太网双归保护域中有一条链路称为保护链路， 当以太网双归保护的链路都为完好时， 与所述保护链路相连的节点端口中， 至少要有一个被阻塞， 防止被保护数据从该链路通过， 例如图 3中， 节点 S1 和 S2之间的链路为保护链路， 当双归保护域中的链路都为完好时， 节点 S2 阻塞了保护链路相连端口 22, 防止被保护数据在保护链路上传输。 当双归保 护域中的链路出现故障时， 例如图 4中， 节点 S3和 S4之间的链路出现故障 时， 节点 S3检测到链路故障后， 以太网双归保护域进行保护切换， 节点 S3 向外发送链路故障告警协议帧，节点 S2收到链路故障告警协议帧后打开保护 链路相连端口 22, 另外节点 Sl、 S2和 S3还需要刷新前向地址表， 在以太网 双归保护域完成保护切换后， 被保护数据可以在被打开的保护链路上传输， 形成新的通信路径。 通过以太网双归保护技术， 有效的提高了以太双归网络 的可靠性。 以太网双归保护切换中， 一个节点发送的协议帧需要尽快的到达 其他节点， 才能完成快速切换， 防止切换时间过长导致被保护数据大量丟失， 例如图 4中，节点 S3在检测到链路故障后立即发送的链路故障告警协议帧如 果被节点 S2的阻塞端口丟弃， 则该协议帧无法尽快的到达节点 S1 , 节点 S1 就无法刷新前向地址表， 整个保护切换不能快速完成， 导致切换时间过长， 甚至被保护数据大量丟失。
通过以上的分析可知， 在现有的保护方案中， 链路发生故障时发出的协 议帧有可能会被丟弃， 导致协议帧无法尽快到达目的节点而使得保护切换不 能快速完成， 或者切换时间过长， 甚至被保护数据大量丟失， 还有可能因为 协议帧在形成闭环的协议通道中持续循环传输导致网络风暴。
发明内容
本发明所要解决的技术问题是， 提供一种在以太网保护中协议通道的实 现方法， 本发明使得以太网的保护协议帧能够尽快的到达目的节点， 且防止 了以太保护协议通道形成闭环而导致网络风暴。
本发明公开了一种以太网保护中协议通道的实现方法， 所述方法为： 在以太网的保护域中设置协议通道的阻塞点； 在所述保护域内， 所述协 议通道根据所述阻塞点的类型保持打开或者与所述保护域中被保护数据通道 保持同步打开或阻塞。
若所述以太网的保护类型为环网保护， 则所述以太网为以太环网， 所述 保护域为以太环网保护域； 若所述以太网的保护类型为双归保护， 则所述保 护域为以太网双归保护域。 若所述保护域为以太环网保护域， 则协议通道的阻塞点为以太环网保护 域的互连节点端口和 /或以太环网保护域中用来打开或者阻塞被保护数据通 道的节点端口； 若所述保护域为以太网双归保护域， 则协议通道的阻塞点为 以太网双归保护域的互连节点端口。
若所述阻塞点为以太环网保护域的互连节点端口或者为以太网双归保护 域的互连节点端口， 则所述协议通道保持打开； 若所述阻塞点为以太环网保 护域中用来打开或者阻塞被保护数据通道的节点端口， 则所述协议通道与所 述被保护数据通道保持同步打开或阻塞。
若所述以太环网保护域的互连节点在所述以太网的其他部分具有可连通 性， 则所述协议通道在所述以太网的其他部分也具有可连通性。
若所述以太网双归保护域的阻塞点与所述以太网双归保护域的边界节点 端口之间配置有协议通道， 则所述协议通道保持阻塞。 所述协议通道至少具有一个阻塞点。
本发明使得在以太网的保护域中， 协议通道上至少存在一个阻塞点， 且 保证在链路出现故障时协议通道处于打开状态， 防止了以太保护协议通道形 成闭环而导致网络风暴， 且使得协议帧能够尽快的到达目的节点， 以达到快 速切换的目的， 从而大大提高了网络的性能。
附图概述
图 1为以太环网保护示意图；
图 2为图 1出现链路故障后进行保护切换的示意图；
图 3为以太网双归保护的示意图；
图 4为图 3出现链路故障后进行保护切换的示意图；
图 5为本发明所述方法的流程图；
图 6为本发明所述方法的实施例一的示意图；
图 7为本发明所述方法的实施例二示意图；
图 8为本发明所述方法的实施例三的示意图。 本发明的较佳实施方式
下面参考附图， 结合具体的优选实施例对本发明进行进一步说明， 但本 发明不局限于以下实施例。
如图 5所示， 是本发明所述方法的整体流程图， 包括：
步骤 501 : 根据协议 VLAN或者 MAC地址等创建一个传输以太网保护 协议帧的协议通道。
例如在图 1中， 子环上可以用 VLAN 100传输以太环网保护协议帧。 步骤 502: 在以太网的保护域中设置协议通道的阻塞点；
阻塞点是为了防止以太网保护协议通道形成闭环， 从而导致协议帧形成 网络风暴。
若以太网的保护类型为环网保护， 则所述保护域为以太环网保护域； 若 所述以太网的保护类型为双归保护， 则所述保护域为以太网双归保护域。
协议通道至少有一个阻塞点； 若所述保护域为以太环网保护域， 则保护 通道的阻塞点为以太环网保护域的互连节点端口和 /或以太环网保护域中用 来打开或者阻塞被保护数据通道的节点端口； 若所述保护域为以太网双归保 护域， 则保护通道的阻塞点为以太网双归保护域的互连节点端口。
步骤 503 : 判断阻塞点的类型， 若为以太环网保护域的互连节点端口或 者以太网双归保护域的互连节点端口， 则执行步骤 504; 若为以太环网保护 域中用来打开或者阻塞被保护数据通道的节点端口， 则执行步骤 505;
步骤 504: 以太网保护协议通道保持打开；
步骤 505: 以太网保护协议通道与所述被保护数据通道保持同步打开或 阻塞。
如图 6所示， 是本发明所述方法的实施例一示意图； 结合图 1 , 本实施 例中， 以太网的保护类型为环网保护， 且具有环保护链路， 节点 S2的 22端 口为该环保护链路的阻塞节点端口， 协议通道的阻塞点设置为以太环网保护 域的互连节点端口 S4、 S5 , 则在以太环网保护域内， 以太环网保护域的协议 通道在互连节点 S4的子环端口和 S5的子环端口始终阻塞， 在以太环网保护 域的其他节点端口保持打开状态， 当以太环网保护域的链路都为正常时， 节 点 S2阻塞了端口 22 , 即以太环网保护域的环保护链路被阻塞， 被保护数据 不能从该端口通过， 但是以太网保护协议帧可以从该端口通过， 即以太网保 护协议通道在该端口为打开状态。 因此当节点 S3和 S4之间的链路出现故障 时， 节点 S3检测到链路故障后， 向外发送链路故障告警协议帧， 由于以太网 保护协议通道在节点 S2的端口 22为打开状态， 因此协议帧能够通过该端口 传输， 尽快的到达以太环网保护域的其他节点， 保障了以太环网的快速保护 切换。
如图 7所示， 是本发明所述方法的实施例二示意图， 本实施例中， 协议 通道的阻塞点设置为以太环网保护域中用来打开或者阻塞被保护数据通道的 节点端口， 即图中的节点 S2 , 且以太环网保护域与以太环网的其他部分具有 可连通性， 即可构成闭环。 当以太环网保护域的链路都为正常时， 节点 S2阻 塞了端口 22 , 即： 被保护数据不能从该端口通过， 以太网保护协议帧也不能 从该端口通过。 当节点 S3和 S4之间的链路出现故障时， 节点 S3、 S4检测到 链路故障后， 均向外发送链路故障告警协议帧， 由于以太网保护协议通道在 节点 S2的端口 22为阻塞状态， 该端口在接收到 S3发出的协议帧后才打开， 而打开端口是需要时间的， 所以在打开前收到的协议帧都会被丟弃， 因此节 点 S3发出的协议帧能够快速到达节点 S2 , 但是不能快速到达节点 S1和 S5 , 但因为以太环网保护域与以太环网的其他部分构成闭环， 即在以太环网的其 他部分可以传输以太网保护协议帧， 以太环网保护域的一个节点发出的协议 帧可以通过以太环网的其他部分进行传输到达以太环网保护域的其他节点， 故节点 S4 向外发送链路故障告警协议帧通过以太环网的其他部分传输快速 到达节点 S5和 S1 , 即协议通道在以太环网的其他部分也具有可连通性， 以 太环网保护域内每个节点都能尽快的收到以太环网保护协议帧， 完成快速保 护切换。
如图 8所示， 是本发明所述方法的实施例三示意图， 结合图 3 , 本实施 例中， 以太网的保护类型为双归保护， 即保护域为以太网双归保护域， 由于 以太网双归保护域和其他网络相连接时， 在其他网络中不能保证以太网保护 协议帧可以在其中传输， 因此， 对于以太网双归保护域来说， 协议通道的阻 塞点只能设置为互连节点端口 S4和 /或 S5 (本实施例中， 协议通道具有两个 阻塞点—— S4和 S5 ) , 故在以太网双归保护域内， 协议通道保持打开， 而在 以太网双归保护域的边界链路处阻塞， 即若节点 S1与 S5之间、 节点 S3与 S4之间配置有协议通道，则节点 S 1和 S5之间的协议通道及节点 S3和 S4之 间的协议通道均被阻塞。 节点 S1和 S5之间的协议通道被阻塞的方法包括： 节点 S1与节点 S5连接的端口 11阻塞；或者节点 S5与节点 S1连接的另一端 口阻塞。节点 S3和 S4之间的协议通道被阻塞的方法与节点 S1和 S5的相同。 在以太网双归保护域内， 无论被保护数据通道的端口是否被阻塞， 以太网保 护协议通道都是打开的。 因此当节点 S3和 S4之间的链路出现故障时， 节点 S3检测到链路故障后， 向外发送链路故障告警协议帧， 由于以太网保护协议 通道在节点 S2的端口 22为打开状态， 因此协议帧能够通过该端口传输， 尽 快的到达双归域的每个节点， 保障了以太双归网络的快速保护切换。
工业实用性
本发明使得在以太网的保护域中， 协议通道上至少存在一个阻塞点， 且 保证在链路出现故障时协议通道处于打开状态， 防止了以太保护协议通道形 成闭环而导致网络风暴， 且使得协议帧能够尽快的到达目的节点， 以达到快 速切换的目的， 从而大大提高了网络的性能。

Claims

权 利 要 求 书
1、 一种以太网保护中协议通道的实现方法， 包括：
在以太网的保护域中设置协议通道的阻塞点； 在所述保护域内， 所述协 议通道根据所述阻塞点的类型保持打开或者与所述保护域中被保护数据通道 保持同步打开或阻塞。
2、 如权利要求 1所述的以太网保护中协议通道的实现方法， 其中， 若所 述以太网的保护类型为环网保护， 则所述以太网为以太环网， 所述保护域为 以太环网保护域； 若所述以太网的保护类型为双归保护， 则所述保护域为以 太网双归保护域。
3、 如权利要求 2所述的以太网保护中协议通道的实现方法， 其中， 若所 述保护域为以太环网保护域， 则所述阻塞点为以太环网保护域的互连节点端 口和 /或以太环网保护域中用来打开或者阻塞被保护数据通道的节点端口； 若 所述保护域为以太网双归保护域， 则所述阻塞点为以太网双归保护域的互连 节点端口。
4、 如权利要求 1或 3所述的以太网保护中协议通道的实现方法， 其中， 若所述阻塞点为以太环网保护域的互连节点端口或者为以太网双归保护域的 互连节点端口， 则所述协议通道保持打开； 若所述阻塞点为以太环网保护域 中用来打开或者阻塞被保护数据通道的节点端口， 则所述协议通道与所述被 保护数据通道保持同步打开或阻塞。
5、 如权利要求 2所述的以太网保护中协议通道的实现方法， 其中， 若所 述以太环网保护域的互连节点在所述以太环网的其他部分具有可连通性， 则 所述协议通道在所述以太环网的其他部分也具有可连通性。
6、 如权利要求 3所述的以太网保护中协议通道的实现方法， 其中， 若所 述以太网双归保护域的阻塞点与所述以太网双归保护域的边界节点端口之间 配置有协议通道， 则所述协议通道保持阻塞。
7、 如权利要求 1所述的以太网保护中协议通道的实现方法， 其中， 所述 协议通道至少具有一个阻塞点。
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