WO2011094970A1

WO2011094970A1 - Method and system for port-blocking in ethernet protection

Info

Publication number: WO2011094970A1
Application number: PCT/CN2010/071676
Authority: WO
Inventors: 吴少勇
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-02-05
Filing date: 2010-04-09
Publication date: 2011-08-11
Also published as: CN102148801A

Abstract

The invention discloses a method for port-blocking in Ethernet protection. When a node in a protected link sets the state of a port to be a blocked state, a port block notification protocol frame is sent from the port, to notify the node at the other end of the link in which the port locates to block the port which receives the protocol frame; after receiving the port block notification protocol frame, the node at the other end sets the state of the port which receives the port block notification protocol frame to be a blocked state. The invention also discloses a system for port-blocking in Ethernet protection simultaneously. With the schemes of the invention, the node ports at both ends of a link can be blocked in Ethernet protection which is in the scenario of link switching, etc., so that bandwidth resource waste, due to protected data entering the link when only the port at one end of the link is blocked, is avoided.

Description

Method and system for blocking port in Ethernet protection

The present invention relates to Ethernet protection technologies, and in particular, to a method and system for blocking a port in Ethernet protection. Background technique

With the development of Ethernet in the direction of multi-service bearer, especially for some services, the reliability and real-time requirements of the network are becoming higher and higher. Ethernet has widely used protection technologies, such as Ethernet ring networking, thereby improving the network. Network reliability. Moreover, in the protection scheme of the ring network, it is generally required that the fast protection switching can reach 50 ms or less. Currently, this fast protection switching technology can be implemented based on the G.8032 v2 protocol of the International Telecommunication Union (ITU-T).

Based on the G.8032 v2 protocol, an automatic protection switching protocol and mechanism is defined for the Ethernet layer of the ring topology Ethernet. The network protection method is applicable to the ring topology Ethernet. The main processes of the network protection are as follows: In the ring topology Ethernet, select a link as a ring protection link (RPL) and a ring protection link. The neighboring one or two node control loops block or open the protection link, where a node is called a ring protection link when the two node control ring protection links adjacent to the ring protection link are blocked or opened. The node (RPL Owner Node ), another node is called the RPL Neighbor Node, and the adjacent ports of the adjacent two nodes of the ring protection link are called ring protection link adjacent ports (PRL Port) ).

When the link of the Ethernet ring network is fault-free and there is no request for a handover command, the two adjacent nodes of the ring protection link block the adjacent ports of the protection link to prevent the protected data from passing through the ring protection link; There is only a single communication path between any two nodes on the Ethernet ring network. Therefore, the closed loop of the communication path is not generated in the Ethernet ring network, preventing closed loop and network storm. Ethernet ring When the link fails, or when the node receives the switch command request, if the port that detects the fault or the switch command request port is not the adjacent port of the ring protection link, the fault port or the switch command request port will be blocked by the node. Two nodes adjacent to the ring protection link open two ring protection link adjacent ports, so that the protected data can pass through the ring protection link, and a new one is generated between the two nodes on the ring protection link. The communication path ensures the reconnection of the communication path and improves the reliability of the network.

In Ethernet protection, port blocking is a very important feature. After the port is blocked, the protected data cannot pass through the blocked port. When the port is opened, the protected data can pass through the open port, that is, the node in the Ethernet protection controls the communication path of the protected data through the blocking and opening of the port. However, in general, a link has two adjacent ports. If only one of the ports is blocked, the other port can still send protected data to the link. After the protected data reaches the blocked port, it will eventually be lost. Abandoned, therefore, if only the port at one end of the link is blocked, and the other end sends protected data to the link, the link bandwidth resources are wasted. In the G.8032 v2 protocol, a method for configuring a ring protection link neighbor node in an Ethernet ring network is proposed. When there is no fault in the Ethernet ring network and there is no handover command request, both adjacent nodes of the ring protection link are The blocking ring protects the adjacent ports of the link, and the protected data does not enter the ring protection link. This prevents the protected data from wasting bandwidth resources of the ring protection link. Other non-protected data can be effectively used to protect the link. link.

The above-mentioned Ethernet protection port blocking method ensures that the protected ring data does not enter the ring protection link when the Ethernet ring network is fault-free and has no switching command, thereby effectively saving the bandwidth resource of the ring protection link, but The port blocking method requires a ring protection link neighbor node to be configured separately. The configuration is complicated. When the configured node is not in the correct position, the network is interrupted. In addition, when a node is added or removed in Ethernet, a large number of configurations need to be changed, and the implementation is not flexible. In addition, when a handover command is applied to the Ethernet ring network, the port requested by the handover command is blocked, and the port at the other end of the link where the port is located is not blocked. The protected data can send traffic to the link through the port that is not blocked, and is eventually discarded by the blocked port, or the bandwidth resource of the link is wasted. It can be seen that the above-mentioned Ethernet protection port blocking method is not flexible and is not applicable to the switched scenario. At present, there is no effective solution to how to avoid port blocking in such Ethernet protection.

As far as the prior art is concerned, the Ethernet ring network protection structure based on G.8032 v2 is as shown in FIG. 1 , wherein nodes S1, S2, S3 and S4 form an Ethernet ring network, and a link between nodes S1 and S4 For the ring protection link, the node S1 is the node to which the ring protection link belongs, and the node S4 is the ring protection link neighbor node. The node S1 blocks or opens the ring protection link through the control port 11 to block or open the ring protection link. It means that the blocked node port cannot complete the forwarding function of the protected data, but can still receive or send the Ethernet ring protection protocol frame of G.8032 v2. When the Ethernet ring link shown in Figure 1 is fault-free and there is no handover command request, node S1 blocks port 11, node S4 blocks port 42 to prevent protected data from passing through the ring protection link, and node S2 to the ring. The broadcast traffic of the protected data is not forwarded to the ring protection link between the nodes S1 and S4, which prevents the bandwidth of the ring protection link from being wasted. However, this method needs to configure the ring protection link neighbor node S4. The configuration is complex and inflexible.

After the command switching request appears in FIG. 1, it is assumed that the node S2 receives the command switching request blocking port 22. Then, the Ethernet ring protection structure is as shown in FIG. 2. First, the node S2 blocks the port 22 according to the command switching request, and sends a command switch. The request protocol frame notifies other nodes to perform protection switching. Then, after receiving the command switching request protocol frame, the node S1 to which the ring protection link belongs opens the blocked port 11 connected to the ring protection link, and the ring protection link neighbor node S4 receives After the command to switch the request protocol frame, the blocked port 42 connected to the ring protection link is opened. After the Ethernet ring network is switched, only the port 22 of the node S2 is blocked in the ring network. Thus, the node S2 sends the ring to the ring. The broadcast traffic of the protected data will not be forwarded from port 22 of node S2, but will be forwarded from port 31 of node S3 to the link between nodes S2 and S3, and finally discarded by node S2. It is necessary to forward from node S3 to port 31, obviously wasting nodes S2 and S3 Link bandwidth resources between. Summary of the invention

In view of the above, the main purpose of the present invention is to provide a method and a system for blocking a port in an Ethernet protection, so that the Ethernet ports can block the ports at both ends of the link in a variety of scenarios, and the configuration is simple and flexible.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The invention provides a method for blocking a port in an Ethernet protection. The method includes: when a node on a protection link sets a port state to a blocking state, sending a port blocking notification protocol frame from a port configured with a blocking state, notifying the The other end node of the link where the port in the blocked state is set to block the port that receives the port blocking notification protocol frame;

After receiving the port blocking notification protocol frame, the other end node sets the state of the port that receives the port blocking notification protocol frame to a blocking state.

In the above solution, the sending port blocking notification protocol frame is sent only once, or the number of transmissions is specified in advance, or is continuously transmitted according to a fixed period; or after the specified number of times is sent according to the first fixed period, the transmission is continued according to the second fixed period.

In the above solution, the method further includes: after receiving the port blocking notification protocol frame, determining, by the other end node, whether the state of the port that receives the port blocking notification protocol frame is blocked, and if not, the setting is Blocked state; if it is blocked, it is not set.

In the above solution, the method further includes: after receiving the port blocking notification protocol frame, the other end node does not forward the received port blocking notification protocol frame.

The invention provides a system for blocking a port in an Ethernet protection, the system comprising: a first node, one or more second nodes; wherein

The first node is configured to send a port blocking notification protocol frame from the port that is in the blocking state when the port state is set to the blocking state, and notify the second node at the other end of the link where the blocking state port is located to block the receiving station. Port of the port blocking notification protocol frame; The second node is configured to: after receiving the port blocking notification protocol frame, set a state of the port that receives the port blocking notification protocol frame to a blocking state.

In the above solution, the first node sends a port blocking notification protocol frame to be sent only once, or pre-specifies the number of transmissions; or preset a fixed period, and continuously transmits according to a fixed period; or preset two fixed periods, according to the first After the fixed period is sent a specified number of times, it is continuously sent according to the second fixed period.

In the above solution, the second node is further configured to: after receiving the port blocking notification protocol frame, determine whether the state of the port that receives the port blocking notification protocol frame is blocked, and if not, the blocking state is set to block. Status; if it is blocked, it is not set.

In the foregoing solution, the second node is further configured to: after receiving the port blocking notification protocol frame, not forwarding the received port blocking notification protocol frame.

The method and system for blocking a port in an Ethernet protection provided by the present invention, when a node on a protection link sets a port state to a blocked state, a port blocking notification protocol frame is sent from the port, and the other end of the link where the port is located is notified The node blocks the port that receives the protocol frame. After receiving the port blocking notification protocol frame, the other end node sets the state of the port that receives the port blocking notification protocol frame to a blocked state. In this way, when the Ethernet protection is performed in the multiple scenarios of the link switching, the node ports at both ends of the link can be blocked, and the bandwidth resource caused by the protected data entering the link is prevented when only one port of the link is blocked. Moreover, by applying the method of the present invention, the configuration is simple and flexible. DRAWINGS

1 is a schematic structural diagram of a system for protecting an Ethernet ring network based on G.8032 v2 in the prior art; FIG. 2 is a schematic structural diagram of a system in which a node S2 of FIG. 1 receives a command switching request blocking port 22 in the prior art;

3 is a schematic flowchart of a method for blocking a port in an Ethernet protection according to the present invention; FIG. 4 is a schematic structural diagram of a system for blocking a port in an Ethernet protection according to the present invention; FIG. 5 is a schematic flowchart of a method for implementing a command switching request blocking port 22 and port 31 by the node S2 of FIG. 1 according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a system for implementing the node switching request blocking port 22 and port 31 by the node S2 of FIG. 1 according to an embodiment of the present invention. detailed description

The basic idea of the present invention is: when a node on the protection link sets the port state to the blocking state, the port blocking notification protocol frame is sent from the port, and the other end node of the link where the port is located is blocked from receiving the protocol frame. After receiving the port blocking notification protocol frame, the other end node sets the state of the port that receives the port blocking notification protocol frame to a blocking state.

The port blocking notification protocol frame is a protocol frame carrying a blocking flag, and the blocking flag may be an agreed destination media access control (MAC) address, or a blocked specific service name.

The invention will be further described in detail below with reference to the drawings and specific embodiments.

The method for blocking a port in Ethernet protection is implemented by the present invention. As shown in FIG. 3, the method includes the following steps:

Step 301: The node on the protection link sets the state of the port to be blocked to the blocking state when receiving the handover command request or detecting the fault.

Step 302: The node on the protection link sends a port blocking notification protocol frame from the port that is changed to the blocking state, and notifies the other end node of the link where the port is located to block the port that receives the protocol frame. The protocol frame can be sent only once by default. It can also specify the number of transmissions in advance, or continue to transmit according to a fixed period, or send a specified number of times according to the first fixed period, and then continue to transmit according to the second fixed period.

Step 303: After receiving the port blocking notification protocol frame, the other end node of the link sets the state of the port that receives the port blocking notification protocol frame to a blocking state.

The step may further include: after receiving the port blocking notification protocol frame, the other end node of the link determines whether the state of the port that receives the port blocking notification protocol frame is a blocked state, such as If it is not in the blocking state, it is set to the blocking state; if it is in the blocking state, it is not set; further, the step further includes: the other node of the link does not block the port after receiving the port blocking notification protocol frame The protocol frame is forwarded.

In order to achieve the above method, the present invention further provides a system for blocking a port in an Ethernet protection. As shown in FIG. 4, the system includes: a first node 41 and a second node 42;

The first node 41 is configured to send a port blocking notification protocol frame from the port when the port state is set to the blocking state, and notify the second node 42 at the other end of the link where the port is located to block the port that receives the protocol frame;

The second node 42 is configured to: after receiving the port blocking notification protocol frame, set the state of the port that receives the port blocking notification protocol frame to a blocking state; the second node 42 may have multiple.

Further, the first node 41 sends a port blocking notification protocol frame, which may be sent only once by default, or may specify the number of transmissions in advance, or set a fixed period in advance, continuously transmit according to a fixed period, or preset two fixed periods. After sending the specified number of times according to the first fixed period, the transmission is continued according to the second fixed period.

After receiving the port blocking notification protocol frame, the second node 42 is further configured to determine whether the state of the port that receives the port blocking notification protocol frame is blocked, and if not, the blocking state is set to be blocked; Blocked state, no settings are made.

Further, after receiving the port blocking notification protocol frame, the second node 42 is further configured to not forward the port blocking notification protocol frame. When the command switching request occurs in the system shown in FIG. 1, the method for blocking the port in the Ethernet protection of the present invention after the node S2 receives the command switching request, as shown in FIG. 5 and 6, includes the following steps:

Step 501: The node S2 switches the request blocking port 22 according to the received command, and sends a command switching request protocol frame to notify the nodes S1 and S4 to perform protection switching, and sends the port through the port 22. Blocking the protocol frame to port 31 of node S3;

In this embodiment, the sending port blocking protocol frame is sent once by default;

Step 502: The node S1 and the node S4 of the ring protection link respectively open the blocked port of the ring protection link; after receiving the port blocking notification protocol frame from the port 31, the node S3 does not forward the protocol frame, and determines the status of the port 31. After the blocking state is not set, the state of the port 31 is set to be blocked;

Specifically, after receiving the command switching request protocol frame, the node S1 to which the ring protection link belongs, opens the blocked port 11 connected to the ring protection link, and the ring protection link neighbor node S4 receives the command switching request protocol frame, and then opens the blocking. The port 42 connected to the ring protection link; after receiving the port blocking notification protocol frame from the port 31, the node S3 does not forward the protocol frame and determines the current state of the port 31. After determining that it is not blocked, the node S3 sets the port. The state of 31 is a blocked state.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

Claim

A method for blocking a port in an Ethernet protection, the method comprising: when a node on a protection link sets a port state to a blocking state, sending a port blocking notification protocol frame from a port configured with a blocking state, and notifying The other end node of the link where the port in which the blocking state is set blocks the port that receives the port blocking notification protocol frame;

The method according to claim 1, wherein the sending port blocking notification protocol frame is sent only once, or the number of transmissions is specified in advance, or is continuously transmitted according to a fixed period; or after the specified number of times is sent according to the first fixed period , continue to send according to the second fixed period.

The method according to claim 1 or 2, wherein the method further comprises: after receiving the port blocking notification protocol frame, the other end node determines whether the state of the port receiving the port blocking notification protocol frame is It is blocked, if it is not blocked, it is set to blocking state; if it is blocked, it is not set.

The method according to claim 1 or 2, wherein the method further comprises: after receiving the port blocking notification protocol frame, the other end node does not forward the received port blocking notification protocol frame.

A system for blocking a port in an Ethernet protection, the system comprising: a first node, one or more second nodes;

The first node is configured to send a port blocking notification protocol frame from the port that is in the blocking state when the port state is set to the blocking state, and notify the second node at the other end of the link where the blocking state port is located to block the receiving station. Port of the port blocking notification protocol frame;

And the second node is configured to: after receiving the port blocking notification protocol frame, set a state of the port that receives the port blocking notification protocol frame to a blocking state.

The system according to claim 5, wherein the first node sends a port The blocking notification protocol frame is sent only once, or the number of transmissions is specified in advance; or a fixed period is preset, and the transmission is continued according to a fixed period; or two fixed periods are preset, and after the specified number of times is sent according to the first fixed period, the second fixed is performed. The cycle continues to be sent.

The system according to claim 5 or 6, wherein the second node is further configured to: after receiving the port blocking notification protocol frame, determine whether the status of the port that receives the port blocking notification protocol frame is Blocked state, if it is not blocked, it is set to blocking state; if it is blocked, it is not set.

The system according to claim 5 or 6, wherein the second node is further configured to not forward the received port blocking notification protocol frame after receiving the port blocking notification protocol frame.