WO2015158112A1

WO2015158112A1 - Method and apparatus for implementing cross-board channel protection

Info

Publication number: WO2015158112A1
Application number: PCT/CN2014/087397
Authority: WO
Inventors: 刘冠葳; 孟凤莉
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-04-16
Filing date: 2014-09-25
Publication date: 2015-10-22
Also published as: CN105024837A

Abstract

Disclosed are a method and apparatus for implementing cross-board channel protection, relating to the technical field of optical communications. The method includes the following steps: by the cascading of multiple boards in each network element of two adjacent network elements, a cross-board port aggregation group is formed at the line side ports of the two network elements; each board of the two network elements detects the transmission quality and/or connection state of the line side ports in real time; when one board of one network element detects that the transmission quality and/or connection state of the board line side ports is abnormal, the board forwards, via other cascading boards and the cross-board port aggregation group, the service from a client to the corresponding board of the other network element. In the present invention, the bandwidths of all the line side ports can be shared, and the utilization of the line side bandwidth can be increased.

Description

Method and device for realizing cross-board channel protection

Technical field

The present invention relates to the field of channel protection technologies, and in particular, to a method and apparatus for implementing cross-board channel protection.

Background technique

The existing cross-board channel protection method is mainly based on the APS (Automatic Protection Switched) protection technology. One board is used as the main board and the other board is used as the standby board. Under normal circumstances, only the main board is in working state. After a line-side fault occurs, the APS protocol cuts the link to the standby board to implement link protection switching. This board-level protection method cannot fully utilize the bandwidth of the line side port of the standby board, and requires APS protocol support.

In view of the above problems, the present invention proposes a method and apparatus for implementing cross-board channel transmission.

Summary of the invention

It is an object of the present invention to provide a method and apparatus for implementing cross-board channel transmission, which solves the problem that the bandwidth of the line side of the standby board cannot be utilized in the prior art, and the APS protocol is required.

In accordance with an embodiment of the present invention, a method of implementing cross-board channel transmission is provided, comprising the steps of:

A port-span aggregation group is formed on the line-side ports of the two network elements by cascading a plurality of boards in each of the network elements.

Each board of the two network elements performs real-time detection on the transmission quality and/or connection status of the line side port thereof;

When a board of a network element detects that the transmission quality and/or the connection status of the line-side port of the board is abnormal, the board forwards the packet from the client through the cascaded other boards and the port-span aggregation group. The service of the other end is sent to the corresponding board of another network element.

Preferably, the board includes a plurality of client side ports, a plurality of line side ports, and two cascade ports; wherein each of the plurality of network elements is level by the two cascade ports. A plurality of line side ports of the plurality of boards in the two network elements form a port cross-board aggregation group.

Preferably, real-time detection of the transmission quality and/or connection status of each line side port of each of the two network elements includes:

When the line-side port of each board is a 10M/100M/1000M electrical port or a 100M/GE or 10GE optical port, the physical connection status of the line-side port is detected in real time.

When the line side port of each board is an optical transport network OTN port, the transmission quality of the line side port is detected in real time.

Preferably, the board forwards the service from the client to the corresponding board of the other network element by using the cascading other boards and the port-span aggregation group to include:

After receiving the service from the client side, the board adds a private packet header before the packet of the received client side service;

Selecting other boards that are cascaded through the expansion port according to the added private packet header;

The service of the client is forwarded to the corresponding board of another network element by using the selected other board and the port-span aggregation group.

Preferably, each of the boards includes a line side port member list, and each line side port includes a forwarding mark and an alarm flag;

Each of the boards notifies the forwarding label and the alarm flag of each line-side port in the line-side port member list to the other boards in the format of the notification message via the cascade port.

According to another embodiment of the present invention, an apparatus for implementing cross-board channel transmission is provided, including:

A port-to-board aggregation group module is formed, and is configured to form a port spanning board on the line side ports of the two network elements by cascading a plurality of boards in each of the two network elements in the adjacent two network elements. Aggregation group

The monitoring module is configured to perform real-time detection on the transmission quality and/or connection status of each line side port of each of the two network elements;

The forwarding module is configured to: when a board of a network element detects that the transmission quality and/or the connection status of the line side port of the board is abnormal, the board passes the cascaded other boards and the port cross-board The aggregation group forwards the service from the client to the corresponding board of another network element.

Preferably, the detecting module comprises:

The connection state detecting unit is configured to perform real-time detection on the physical connection state of the line side port when the line side port of each board is a 10M/100M/1000M electrical port or a 100M/GE or 10GE optical port;

The transmission quality detecting unit is configured to perform real-time detection on the transmission quality of the line side port when the line side port of each board is the optical transport network OTN port.

Preferably, the forwarding module includes:

The packet header unit is added, and after the board receives the service from the client side, the private packet header is added before the packet of the received client side service.

Select another board unit, and set the other boards that are cascaded through the expansion port according to the added private packet header.

The forwarding unit is configured to forward the service of the client to the corresponding board of another network element by using the selected other board and the port-span aggregation group.

Compared with the prior art, the beneficial effects of the present invention are:

The invention realizes cascading a plurality of boards and forming a cross-board aggregation group on the line side ports through the inter-board aggregation unit in each board, so that the interaction can be realized without artificial or unnecessary use of the automatic protection switching protocol. The protection of the line side channel, while transmitting data can share the bandwidth of all line side ports, increasing the utilization of the line side bandwidth.

DRAWINGS

1 is a flow chart of a method for implementing cross-board channel transmission provided by the present invention;

2 is a schematic diagram of an apparatus for implementing cross-board channel transmission provided by the present invention;

3 is a structural diagram of a single board system according to an embodiment of the present invention;

4 is a structural diagram of a cross-board aggregation unit in a single board according to an embodiment of the present invention;

FIG. 5 is a system diagram of providing cross-board channel aggregation protection according to an embodiment of the present invention; FIG.

6 is a data flow path diagram of a line side channel in a normal situation according to an embodiment of the present invention;

7 is a data flow path diagram of a line side channel failure according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a normal forwarding path of a line side according to an embodiment of the present invention; FIG.

FIG. 9 is a forwarding path diagram of a line side fault according to an embodiment of the present invention.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for implementing cross-board channel transmission provided by the present invention. As shown in FIG. 1, the method includes the following steps:

In the step S101, a port-span aggregation group is formed on the line-side ports of the two network elements by cascading a plurality of boards in each of the network elements.

The board of the present invention includes a plurality of customer side ports, a plurality of line side ports, and two cascade ports; wherein each board in each network element is cascaded through the two cascade ports A plurality of line side ports of the plurality of boards in the two network elements form a port cross-board aggregation group.

Step S102: Each board of the two network elements performs real-time detection on the transmission quality and/or connection status of the line side port thereof;

Step S103: When a board of a network element detects that the transmission quality and/or the connection status of the line-side port of the board is abnormal, the board passes the cascaded other boards and the port-span aggregation group. Forward the service from the client to the corresponding board of another NE.

The forwarding of the service from the client to the corresponding card of the other network element by the other boards and the port-span aggregation group of the board includes: after the board receives the service from the client side, Adding a private packet header to the packet of the received client-side service; selecting other boards that are cascaded through the expansion port according to the added private packet header; using the selected other boards and the port spanning The board aggregation group forwards the service of the client to the corresponding board of another network element.

Specifically, each of the boards includes a line side port member list, and each line side port includes a forwarding mark and an alarm flag; wherein each of the boards is in the line side port member list The forwarding label and the alarm flag of each line-side port are notified to other boards through the cascade port in the format of the notification message.

FIG. 2 is a schematic diagram of an apparatus for implementing cross-board channel transmission according to the present invention. As shown in FIG. 2, the method includes: forming a port-span board aggregation group module 201, which is set to be adjacent to two network elements, The plurality of boards in the network element are cascaded, and the line-side port of the two network elements forms a port-span aggregation group; the monitoring module 202 is configured as each board of the two network elements. The transmission quality and/or the connection status of the line side port are detected in real time; the forwarding module 203 is configured to: when a board of one network element detects that the transmission quality and/or the connection status of the line side port of the board is abnormal, The board forwards the service from the client to the corresponding board of another network element through the other cascading boards and the port-span aggregation group.

The board of the present invention includes a plurality of customer side ports, a plurality of line side ports, and two cascade ports; wherein each board in each network element is cascaded through the two cascade ports A plurality of line side ports of the plurality of boards in the two network elements form a port cross-board aggregation group. Each of the boards further includes a line side port member list, each line side port including a forwarding flag and an alarm flag; wherein each of the boards will each line in the line side port member list The forwarding label and the alarm flag of the side port are notified to other boards through the cascade port in the format of the notification message.

Specifically, the detecting module 202 includes: a connection state detecting unit, configured to be a line side port when the line side port of each board is a 10M/100M/1000M electrical port or a 100M/GE or 10GE optical port. The physical connection state is detected in real time; the transmission quality detecting unit is configured to perform real-time detection on the transmission quality of the line side port when the line side port of each board is the optical transport network OTN port. The forwarding module 203 includes: adding a packet header unit, and setting the board to receive a service from the client side, adding a private packet header before receiving the packet of the client-side service; and selecting other board units, Set to select according to the added private message header The other boards that are cascaded by the expansion port are configured to forward the service of the client to the corresponding board of another network element by using the selected other board and the port-span aggregation group.

FIG. 3 is a structural diagram of a single board system according to an embodiment of the present invention. As shown in FIG. 3, the system includes a layer 2 forwarding unit, a cross-board aggregation unit, a client side unit, a line side unit, and two cascade ports, specifically The layer-side forwarding unit is configured to implement forwarding of Ethernet data packets, and the cross-board aggregation unit is configured to implement multi-board aggregation function of the multiple boards, and the client-side unit includes N client-side ports (N>=1). Set to the customer service access, the line side unit includes N line side ports (N>=1), which are set to be interconnected with the line side port of the peer network element, and the two cascade ports are set to be more than the network element. Single board cascading.

FIG. 5 is a schematic diagram of a system for providing cross-board channel aggregation protection according to an embodiment of the present invention. As shown in FIG. 5, the method includes: multiple boards for cross-board aggregation, a line side, and a client side. For the customer service, the customer side includes the Ethernet services such as GE (Gigabit Ethernet) and 10GE. The other side connected to the user side of the board is the line side, including GE, 10GE, and OTN. Optical Transport Network, optical transport network, and other ports.

The contents of the present invention will be specifically described below with reference to FIGS. 6 to 9:

The line side of the board is added to the same cross-board aggregation group.

A plurality of line-side ports of each board in the N-board (N>1) form an inter-board aggregation group. The inter-board aggregation unit in each board maintains a port member list. The list defaults. In the case where all line side ports are added, it can also be specified manually. The port member list uses [board ID+port number] to identify a line-side port. For example, the port member list of the network element A cross-board aggregation group in Figure 6 is: [1,1], [1,2], [ 2, 3], [3, 2]; The list of port members of the network element B cross-board aggregation group is: [1, 3], [1, 4], [2, 4], [3, 1].

The inter-board aggregation unit monitors the line side channel status and/or transmission quality in real time;

When the line side channel is changed or an alarm occurs, the forwarding flag of the local port is set according to the alarm processing policy, and the inter-board aggregation unit of other boards is notified through the expansion port. As shown in FIG. 4, the inter-board aggregation unit includes an alarm detection subunit, a forwarding control subunit, and an egress port selection logic subunit. The forwarding control subunit is configured to have a forwarding flag on each member port, and set 1 to forward, and 0 to not forward, and the label is controlled by the inter-board aggregation group. The alarm detection subunit is set to have an alarm flag bit on each member port. Setting 1 indicates that there is an alarm, and setting 0 indicates no alarm. The Out Port Selection Logic subunit is set to select an out port from the member port list based on the priority level. The port member list and port status of each board are shared with other boards through internal messages, so that each board on the system knows the port membership of other boards. In When the system is initialized for the first time, the inter-board aggregation unit notifies all the line-side port members and status of the local board to other boards.

Judging the line side channel status and transmission quality according to the transmission medium of the line side port includes the following:

1. When the transmission medium of the line side port is a 10M/100M/1000M electrical port, only the physical connection state (up/down) is detected;

2. When the transmission medium of the line-side port is 100M/GE or 10GE optical port, the physical connection status and optical signal status (weak light alarm, strong light alarm, etc.) are detected.

3. When the transmission medium of the line side port is an OTN port, the transmission quality of the line side channel is judged according to the OTN layer alarm, and the alarms listed in Table 1 are used as the condition for judging the transmission quality of the line side channel by the inter-board aggregation group.

Table 1 OTN layer alarms

There are a variety of transmission media on the line side port. It is not limited to the above three cases. The alarms and link status detected by different transmission media are different. You can also set an alarm policy to select whether to use certain alarms as the conditions for setting port forwarding. The forwarding status of the port can also be configured manually.

When the port is from alarm to no alarm, the local port forwarding flag is set to 0, and the notification is sent to the other boards from the expansion port. When the port is from no alarm to when there is an alarm, the local port forwarding flag is set to 1, and the notification is sent. Text to other boards.

3. The board forwards the Ethernet packets received from the client to the inter-board aggregation unit through the Layer 2 forwarding unit.

After receiving the Ethernet packet from the client side, the inter-board aggregation unit selects the egress port according to the forwarding policy and forwards the Ethernet packet.

The forwarding policy is that the inter-board aggregation unit selects the port from the member port list according to the following priority levels: if the line-side port of the local linkup, the port number of which is the smallest priority forwarding; if the line side port of the other board linkup A board with multiple linkup ports is preferred.

As shown in Figure 8, if the egress port is a local port, it will be forwarded directly from the local port.

In circle 1, the network element A client 2 packet enters from the board 2;

Circle 2, after passing through the layer 2 forwarding unit, and then exiting from the side port of the single board 2 through the cross-board logic unit;

In circle 3, the packet enters from the line side of the network board B board 2 line;

Circle 4 is forwarded to the network element B client 2 through the layer 2 forwarding unit.

As shown in Figure 9, if the egress port is a port of another card, add a private packet header to the client service packet and forward it to the expansion port.

The steps include:

Circle 1, learn MAC at the entrance: [Customer 2MAC, vid, board 2, port 1];

Loop 2, forwarded from the expansion port, with a private packet header: [message type, board 2, port 1, board 1, port 2].

5. After receiving the packet, the cascading interface determines whether it is a notification packet or a service packet according to the packet type. If the notification packet is a notification packet, the forwarding label in the member port list is set according to the [board ID+port number]. If it is a service packet, it is forwarded according to the internal MAC (Media Access Control) forwarding entry. The learning MAC address is based on the source card ID + source port number + SMAC + VLAN, and then the destination board ID + destination. The port number is forwarded. The content of the internal MAC forwarding entry: [MAC, VID, board ID, port number], where key=[MAC, VID], result=[board ID, port number].

The format of the notification packet is: [message type + source board ID + source board port number + forwarding status];

The packet type is 0001, which is expressed as a notification packet.

Source board ID: The board ID of the local alarm.

Source board port number: The port number where the alarm is generated locally.

Forwarding status: 0-no forwarding, 1-forwarding;

The service packet includes the private packet header and the client service packet. The format of the service packet is: packet type + source board ID + source board port number + destination board ID + destination board port number + customer service Message].

The packet type is 0002, indicating that the packet is a forwarding packet of the client.

Source board ID: indicates the board ID that the client accesses.

Source board port number: indicates the port number that the client accesses.

Destination board ID: indicates the board ID to be sent.

Destination board port number: indicates the port number to be sent.

The steps include:

Circle 3, learning MAC at the entrance: [Customer 2MAC, vid, board 2, port 1]

Circle 4, customer 2's service message is sent from the port, stripping the private header

Circle 5, entrance learning MAC: [Customer 2MAC, vid, board 1, port 3]

Circle 6, forwarded from the expansion port, with a private packet header: [message type, board 1, port 3, ffff, ffff]

Circle 7, learning MAC at the entrance: [Customer 2MAC, vid, board 1, port 3]

Circle 8, check the MAC forwarding table. If there is no MAC of the client B of the network element B, the packet is flooded out from port 1. If there is the MAC of the client 2 of the network element B, it is directly forwarded from port 1.

In summary, the present invention includes the following steps:

a, N-type board line side ports form a cross-board aggregation group;

b. The boards are interconnected through the backplane cascade ports;

c, obtaining transmission quality and connection status of the line side channel;

d. The inter-board aggregation unit performs packet forwarding according to the transmission quality and connection status of the line side port.

e. As shown in Figure 6, the client-side service that is connected to the card is forwarded from the line-side port of the card. When multiple card-side ports are added to the inter-board aggregation group. Select a forwarding with a small port number;

f. As shown in Figure 7, when the line side channel of the board fails, the line side channel of the other board transmits. The transmission channel selects the bandwidth to occupy less.

That is, when the board is damaged, you do not need to replace the board. You only need to connect the client-side device to other boards. When the client-side port fails, you only need to replace the access port. (The port can be other boards. Port), when the line side link fails, the inter-board aggregation unit will automatically switch to other links.

In summary, the present invention has the following technical effects:

Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the invention are to be understood as falling within the scope of the invention.

Industrial applicability

According to the foregoing technical solution provided by the embodiment of the present invention, by cascading a plurality of boards and forming a cross-board aggregation group by the inter-board aggregation unit in each board, no artificial or unnecessary use is required. The automatic protection switching protocol participates to realize the protection of the line side channel, and the transmission data can share the bandwidth of all the line side ports, thereby increasing the utilization of the line side bandwidth.

Claims

A method for implementing cross-board channel protection includes the following steps:

A port-span aggregation group is formed on the line-side ports of the two network elements by cascading a plurality of boards in each of the network elements.

Each board of the two network elements performs real-time detection on the transmission quality and/or connection status of the line side port thereof;

When a board of a network element detects that the transmission quality and/or the connection status of the line-side port of the board is abnormal, the board forwards the packet from the client through the cascaded other boards and the port-span aggregation group. The service of the other end is sent to the corresponding board of another network element.
The method of claim 1, wherein the board comprises a plurality of client side ports, a plurality of line side ports, and two cascade ports; wherein each board in each of the network elements passes through The two cascade ports are cascaded, and a plurality of line side ports of the plurality of boards in the two network elements form a port cross-board aggregation group.
The method according to claim 1, wherein real-time detection of the transmission quality and/or connection status of each line side port of each of the two network elements comprises:

When the line-side port of each board is a 10M/100M/1000M electrical port or a 100M/GE or 10GE optical port, the physical connection status of the line-side port is detected in real time.

When the line side port of each board is an optical transport network OTN port, the transmission quality of the line side port is detected in real time.
The method according to claim 2, wherein the forwarding of the service from the client to the corresponding board of the other network element by the board through the cascaded other boards and the port-span aggregation group includes:

After receiving the service from the client side, the board adds a private packet header before the packet of the received client side service;

Selecting other boards that are cascaded through the expansion port according to the added private packet header;

The service of the client is forwarded to the corresponding board of another network element by using the selected other board and the port-span aggregation group.
The method of claim 4, wherein each of the boards comprises a line side port member list, each line side port including a forwarding flag and an alarm flag;

Each of the boards notifies the forwarding label and the alarm flag of each line-side port in the line-side port member list to the other boards in the format of the notification message via the cascade port.
A cross-board channel protection device comprising:

A port-to-board aggregation group module is formed, and is configured to form a port spanning board on the line side ports of the two network elements by cascading a plurality of boards in each of the two network elements in the adjacent two network elements. Aggregation group

The monitoring module is configured to perform real-time detection on the transmission quality and/or connection status of each line side port of each of the two network elements;

The forwarding module is configured to: when a board of a network element detects that the transmission quality and/or the connection status of the line side port of the board is abnormal, the board passes the cascaded other boards and the port cross-board The aggregation group forwards the service from the client to the corresponding board of another network element.
The device of claim 6, wherein the board comprises a plurality of client side ports, a plurality of line side ports, and two cascade ports; wherein each board in each of the network elements passes through The two cascade ports are cascaded, and a plurality of line side ports of the plurality of boards in the two network elements form a port cross-board aggregation group.
The apparatus of claim 6 wherein said detecting module comprises:

The connection state detecting unit is configured to perform real-time detection on the physical connection state of the line side port when the line side port of each board is a 10M/100M/1000M electrical port or a 100M/GE or 10GE optical port;

The transmission quality detecting unit is configured to perform real-time detection on the transmission quality of the line side port when the line side port of each board is the optical transport network OTN port.
The apparatus of claim 7, wherein the forwarding module comprises:

The packet header unit is added, and after the board receives the service from the client side, the private packet header is added before the packet of the received client side service.

Select another board unit, and set the other boards that are cascaded through the expansion port according to the added private packet header.

The forwarding unit is configured to forward the service of the client to the corresponding board of another network element by using the selected other board and the port-span aggregation group.
The apparatus of claim 9, wherein each of the boards comprises a line side port member list, each line side port including a forwarding flag and an alarm flag;

Each of the boards notifies the forwarding label and the alarm flag of each line-side port in the line-side port member list to the other boards in the format of the notification message via the cascade port.