WO2016082573A1

WO2016082573A1 - Packet forwarding method and apparatus for stacking system, and stacking device

Info

Publication number: WO2016082573A1
Application number: PCT/CN2015/085964
Authority: WO
Inventors: 宋清华
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-11-26
Filing date: 2015-08-03
Publication date: 2016-06-02
Also published as: CN105704023A; CN105704023B

Abstract

The present invention provides a packet forwarding method and apparatus for a stacking system, and a stacking device. The method comprises: a first stacking device in a stacking system acquires a first to-be-forwarded packet to be forwarded to a second stacking device in the stacking system; if the second stacking device is a primary stacking device and the first to-be-forwarded packet is a protocol packet that is not parsed, the first stacking device parses out valid data of the first to-be-forwarded packet, and encapsulates the parsed-out valid data to obtain a second to-be-forwarded packet; and the first stacking device forwards the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly acquire the valid data parsed out from the second to-be-forwarded packet. In the scheme of the present invention, the protocol packet parsing work is executed by a secondary stacking device, and accordingly, the processing pressure of a primary stacking device is reduced.

Description

Packet forwarding method, device and stacking device of stacking system

Technical field

The present invention relates to the field of communications, and in particular, to a packet forwarding method, apparatus, and stacking device in a stacking system.

Background technique

A virtual switching unit (VSU) is a network system virtualization technology that combines multiple devices into a single virtual device. That is, multiple physical devices can be used as a virtual logical device. Generally, a stacking system can provide a highly redundant and highly reliable network environment, and thus is widely used in network networking.

Currently, most protocol packets in the stacking system are processed by the main stacking device. Therefore, when the number of protocol packets to be processed reaches a certain number, the processing load of the main stacking device increases.

Summary of the invention

The embodiment of the invention provides a packet forwarding method, a device, and a stacking device of a stacking system, so as to at least solve the problem of how to reduce the load of the protocol packet processed by the main stacking device.

To solve the above technical problem, an embodiment of the present invention provides a packet forwarding method of a stack system, including:

The first stacking device in the stacking system obtains the first to-be-forwarded packet to be forwarded to the second stacking device of the stacking system;

If the second stacking device is the primary stacking device, and the first packet to be forwarded is an unresolved protocol packet, the first stacking device parses the valid data of the first to-be-forwarded packet. Encapsulating the valid data obtained by the parsing to generate a second to-be-forwarded packet;

The first stacking device forwards the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly obtain the valid that has been parsed in the second to-be-forwarded packet. data.

If the first to-be-forwarded packet is a unicast packet, or the first packet to be forwarded is a protocol packet that has been parsed, the first stacking device directly forwards the first to-be-forwarded packet to the packet to be forwarded. The second stacking device performs forwarding.

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard-forward manner.

The first stacking device maintains a forwarding engine that has configured the forwarding path information. The forwarding path information is specifically: each of the cascade ports of the first stacking device and other than the first stacking device. Correspondence between other stacking devices;

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard-forward manner, including:

The first stacking device determines, by the forwarding engine, a target cascading port that can be connected to the second stacking device according to the forwarding path information; the target cascading port belongs to the first stack device;

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet by using the target cascading port by using the forwarding engine.

In addition, another embodiment of the present invention further provides a packet forwarding device of a stacking system, where the packet forwarding device is disposed on the first stacking device, and includes:

An acquiring module, configured to obtain a first to-be-forwarded packet to be forwarded to the second stacking device of the stacking system;

a processing module, configured to: if the second stacking device is a primary stacking device, and the first to-be-forwarded packet is an unresolved protocol packet, parsing valid data of the first to-be-forwarded packet, and Encapsulating the valid data obtained by the parsing to generate a second to-be-forwarded packet;

The forwarding module is configured to forward the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly obtain the valid data that has been parsed in the second to-be-forwarded packet.

The first to-be-forwarded packet is a unicast packet, or the first to-be-forwarded packet is already solved. And the forwarding module directly forwards the first to-be-forwarded packet to the second stacking device.

The forwarding module forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard forwarding manner.

The forwarding module is specifically configured as a forwarding engine configured with forwarding path information. The forwarding path information is specifically: each cascade port of the first stacking device and other stacks except the first stacking device. Correspondence between connections between devices;

The forwarding engine includes:

Determining a sub-module, configured to determine, according to the forwarding path information, a target cascading port that can be connected to the second stacking device; the target cascading port belongs to the first stacking device;

And the forwarding sub-module is configured to forward the first to-be-forwarded packet or the second to-be-forwarded packet by using the target cascading port.

In addition, another embodiment of the present invention further provides a stacking device, including the above packet forwarding device.

The beneficial effects of the above technical solution of the present invention are as follows:

Compared with the prior art, the method of the present embodiment does not need to perform the parsing step for the protocol packet, so the processing load of the main stack device can be reduced. This solution is especially suitable for stacking systems in the communication field (the main stacking device needs to process a large number of protocol messages), so it has high practical value. In addition, the stacking device uses hard forwarding to deliver messages, achieving higher delivery efficiency with fewer processing resources.

DRAWINGS

1 is a schematic diagram of steps of a packet forwarding method of a stacking system according to the present invention;

2 is a schematic diagram of a logical structure of a stacking system under the packet forwarding method of the stacking system of the present invention;

FIG. 3 is a schematic structural diagram of a message forwarding apparatus of a stacking system according to the present invention.

detailed description

The technical problems, the technical solutions, and the advantages of the present invention will be more clearly described in the following description.

As shown in FIG. 1 , an embodiment of the present invention provides a packet forwarding method of a stack system, including:

Step 11: The first stacking device in the stacking system acquires the first to-be-forwarded packet to be forwarded to the second stacking device of the stacking system.

Step 12: If the second stacking device is a primary stacking device, and the first to-be-forwarded packet is an unresolved protocol packet, the first stacking device parses the first to-be-forwarded packet. The valid data is encapsulated by the parsed to obtain the second to-be-forwarded packet;

Step 13: The first stacking device forwards the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly obtain that the second to-be-forwarded packet has been parsed. Valid data.

In the method of the embodiment, the parsing of the protocol packet is performed by the slave stack device, thereby reducing the processing pressure of the master stack device.

In addition, if the first to-be-forwarded packet is a unicast packet (the final destination address is not a stacking device of the stacking system), or the first packet to be forwarded is a protocol packet that has been parsed (the protocol packet has been downlinked) The first stacking device directly forwards the first to-be-forwarded packet to the second stacking device.

In addition, the current protocol packets are transmitted between the stacking devices through the soft forwarding mode. If there are multiple stacking devices in the middle of the routing path, the CPUs of multiple stacking devices need to be processed, which obviously consumes the processing of the intermediate stacking devices. Resources, transmission efficiency is not high.

To this end, as a preferred solution, the embodiment provides a hard forwarding transmission mode:

That is, the first stacking device maintains a forwarding engine that has configured forwarding path information; the forwarding path information is specifically: each of the cascade ports of the first stacking device and other than the first stacking device Correspondence between other stacking devices;

Transmitting, by the first stacking device, the first stacking device by using the target cascade port by using the forwarding engine A pending packet or a second packet to be forwarded.

The entire scheme of the present invention will be specifically described below in conjunction with the implementation manner.

Exemplarily, in the implementation manner, four stacking devices (

Dev

0, 1, 2, and 3) in the stacking system constitute the topology shown in FIG. 2. Among them, Dev 0 is the main stacking device, and

Dev

1, 2, and 3 are the stacking devices. On the stack device, P0 and P1 are cascade ports, and the stack device establishes a connection through the expansion port. In addition, as shown in FIG. 2, each stacking device separately maintains a forwarding path table for recording forwarding path information.

Assume that Dev 3 receives a protocol packet from the outside of the stack system to the main stacking device Dev 0 through its network port P2.

The CPU of Dev 3 parses the protocol packet and extracts valid data of the protocol packet (the valid data includes specific protocol content, control information, and the like).

The Dev 3 CPU repackages the parsed valid data back into the protocol message.

The Dev 3 CPU controls the forwarding engine of Dev 3 and forwards the protocol packets to Dev 0. In this step, the forwarding engine of the Dev 3 determines that the Dev 0 corresponds to the local P0 port according to the forwarding path table of the Dev 3, that is, the protocol packet is forwarded through the local P0 port.

Since the P0 port of Dev 3 is not directly connected to Dev 0, but is directly connected to Dev2, the protocol message will first reach Dev2. The Dev 2 forwarding engine determines that the protocol packet needs to be sent to Dev 0 according to the destination address of the protocol packet, and determines that Dev 0 corresponds to the local P0 port according to the forwarding path table corresponding to Dev 2, and then passes Dev 2 The P0 port on the forwarding protocol packet.

Based on the above principle, Dev 0 finally receives the protocol packet forwarded by the P0 port on Dev1, and determines itself according to the destination address of the protocol packet, and directly extracts the valid data that has been parsed from the protocol packet. For related processing.

Specifically, the destination address of the protocol packet includes: an identifier of Dev 0. Dev 0 can determine that the protocol packet does not need to be forwarded according to the identity of the Dev 0 of the destination address, but is sent to the processor of the device for processing, and is directly sent to the internal processor through the P2 port. It should be noted that the destination address of the existing packet includes the identity of the destination stack device and the destination stack. The identity of the destination port in the device is not modified by the present invention.

Exemplarily, in the implementation manner, four stacking devices (

Dev

1, 2, and 3 are the stacking devices. On the stack device, P0 and P1 are cascade ports, and the stack device establishes a connection through the expansion port.

Different from the implementation manner, the P2 port of Dev 0 and the P2 port of Dev 3 are network ports, wherein the P2 port of Dev 3 is connected to the external network A, and the P2 port of Dev 0 is connected to the external network B.

It is assumed that Dev 0 receives a unicast packet from the external network A through the network port P2 and needs to be sent to the external network B. The singular system plays only one forwarding route for the unicast packet. If the thin message is processed, the following process is performed:

The forwarding engine of Dev0 determines the P2 port to be sent to Dev 3 according to the destination address of the unicast packet, and determines the local P1 port of Dev 3 according to the forwarding path table of Dev 0, and then forwards it to Dev 3 through the local P1 port. .

As with the implementation principle, in the end, Dev 3 sends the unicast packet to the external network B through its P2 port.

According to the foregoing

implementation manners

1 and 2, it can be known that the method of the present embodiment does not need to perform the parsing step for the protocol packet, and thus the processing load of the main stack device can be reduced. This solution is especially suitable for stacking systems in the communication field (the main stacking device needs to process a large number of protocol messages), so it has high practical value. In addition, the stacking device uses hard forwarding to deliver messages, achieving higher delivery efficiency with fewer processing resources.

In addition, as shown in FIG. 3, a packet forwarding device of a stacking system is disposed on the first stacking device, and includes:

a processing module, configured to: if the second stacking device is a primary stacking device, and the first to-be-forwarded packet is an unresolved protocol packet, parsing valid data of the first to-be-forwarded packet, and Solution Parsing the valid data to be encapsulated, and generating a second to-be-forwarded packet;

In the apparatus of this embodiment, the parsing of the protocol packet is performed by the slave stacking device, thereby reducing the processing pressure of the master stacking device.

among them. And if the first to-be-forwarded packet is a unicast packet, or the first to-be-forwarded packet is a protocol packet that has been parsed, the forwarding module directly sends the first to-be-forwarded packet to the second The stacking device forwards.

among them. The forwarding module forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard forwarding manner.

among them. The forwarding module is specifically configured to be a forwarding engine configured with forwarding path information. The forwarding path information is specifically: each cascade port of the first stacking device and other stacking devices except the first stacking device. Correspondence between connections;

The forwarding engine includes:

Obviously, the packet forwarding apparatus of this embodiment can achieve the same technical effect corresponding to the packet forwarding method described above.

In addition, another embodiment of the present invention further provides a stacking device, including the packet forwarding device described above. The stacking device may be hardware such as a switch or a router.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Industrial applicability

As described above, the patch software upgrade method and system provided by the embodiment of the present invention have the following beneficial effects: the main stack device does not need to perform the parsing step for the protocol packet, so the processing load of the main stack device can be reduced. In addition, the stacking device uses hard forwarding to deliver messages, achieving higher delivery efficiency with fewer processing resources.

Claims

A packet forwarding method of a stack system includes:

The first stacking device in the stacking system obtains the first to-be-forwarded packet to be forwarded to the second stacking device of the stacking system;

If the second stacking device is the primary stacking device, and the first packet to be forwarded is an unresolved protocol packet, the first stacking device parses the valid data of the first to-be-forwarded packet. Encapsulating the valid data obtained by the parsing to generate a second to-be-forwarded packet;

The first stacking device forwards the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly obtain the valid data that has been parsed in the second to-be-forwarded packet. .
The method of claim 1 comprising:

If the first to-be-forwarded packet is a unicast packet, or the first to-be-forwarded packet is a protocol packet that has been parsed, the first stacking device directly sends the first to-be-forwarded packet to the The second stacking device performs forwarding.
The method of claim 2, comprising:

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard forwarding manner.
The method of claim 3, wherein

The first stacking device maintains a forwarding engine that has configured forwarding path information; the forwarding path information is specifically: each cascade port of the first stacking device and other stacks than the first stacking device Correspondence between connections between devices;

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard-forward manner, including:

The first stacking device determines, by the forwarding engine, a target cascading port that can be connected to the second stacking device according to the forwarding path information; the target cascading port belongs to the first stack Equipment

The first stacking device forwards the first to-be-forwarded packet or the second to-be-forwarded packet by using the target cascading port by using the forwarding engine.
A packet forwarding device of a stacking system, where the packet forwarding device is disposed on the first stacking device, and includes:

An acquiring module, configured to obtain a first to-be-forwarded packet to be forwarded to the second stacking device of the stacking system;

a processing module, configured to: if the second stacking device is a primary stacking device, and the first to-be-forwarded packet is an unresolved protocol packet, parsing valid data of the first to-be-forwarded packet, and Encapsulating the valid data obtained by the parsing to generate a second to-be-forwarded packet;

The forwarding module is configured to forward the second to-be-forwarded packet to the second stacking device, so that the second stacking device can directly obtain the valid data that has been parsed in the second to-be-forwarded packet.
The apparatus of claim 5, comprising:

And if the first to-be-forwarded packet is a unicast packet, or the first to-be-forwarded packet is a protocol packet that has been parsed, the forwarding module directly sends the first to-be-forwarded packet to the second The stacking device forwards.
The apparatus according to claim 6, wherein

The forwarding module forwards the first to-be-forwarded packet or the second to-be-forwarded packet to the second stacking device in a hard forwarding manner.
The apparatus according to claim 7, wherein

The forwarding module is a forwarding engine configured with forwarding path information. The forwarding path information is specifically: between each cascade port of the first stacking device and other stacking devices except the first stacking device. Connection correspondence;

The forwarding engine includes:

Determining a sub-module, configured to determine, according to the forwarding path information, a target cascading port that can be connected to the second stacking device; the target cascading port belongs to the first stacking device;

And the forwarding sub-module is configured to forward the first to-be-forwarded packet or the second to-be-forwarded packet by using the target cascading port.
A stacking apparatus comprising the apparatus of any one of claims 5 to 8.