WO2012083670A1

WO2012083670A1 - Method, apparatus and system for reference link negotiation

Info

Publication number: WO2012083670A1
Application number: PCT/CN2011/076585
Authority: WO
Inventors: 汪子梅; 史德伟
Original assignee: 华为技术有限公司
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-06-28
Also published as: CN102388581B; CN102388581A

Abstract

The invention provides a method, an apparatus and a system for reference link negotiation. A first joint device receives Link Aggregation Control Protocol (LACP) negotiation messages sent from a second joint device through all the sub links of an aggregation link group, wherein the LACP negotiation messages carry the system priority and reference link information of the second joint device; the first joint device sets, according to the system priority of the second joint device, the reference link chosen by the second joint device and the reference link chosen by itself to be the same, so that the joint devices at the two ends of a Trunk port choose the same sub link as the reference link of the two ends through negotiation, and the occurrence of the problems of LACP negotiation failure and Trunk port fault which are caused by the inconsistency of reference link choice can be avoided.

Description

Reference link negotiation method, device and system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for reference link negotiation.

Background technique

Trunk (ie, link aggregation group) is an important way for bandwidth extension and link backup in terms of network layered structure and reasonable allocation of broadband. Trunk technology is a link aggregation control technology that allows multiple chains. The roads are aggregated together and used as a logical port to form a link combination. Trunk technology can implement the function of backing up multiple links in a trunk. That is, when a link fails, traffic of other links is not affected, and traffic balancing can be implemented between multiple links.

However, in the prior art, the docking devices at both ends of the aggregation link (for example, Router A and Router B) cannot perceive the reference link information of the peer end, and the selection manner of the reference link is different, and is provided by different equipment vendors. The device does not agree on the reference link selection. When the reference link of the docking device at both ends is not selected on the same link, the sub-link cannot be aggregated into the current aggregation group. The selected state. In this case, the ACP (Link Aggregation Control Protocol) negotiation fails, causing the communication failure of the trunk port. Summary of the invention

An embodiment of the present invention provides a method, an apparatus, and a system for negotiating a link. The device at both ends of the trunk can sense the reference link of the peer end and negotiate the reference links of the two ends on the same link to avoid The LACP negotiation failure and the trunk port failure caused by the inconsistent reference link selection.

The embodiment of the present invention provides a method for negotiating a reference link, where the method includes: the first interfacing device receives an LACP negotiation packet sent by the second interfacing device by using all the sub-links in the aggregation link group, where the LACP is The negotiation packet carries the system priority of the second docking device and the reference link information;

The first docking device determines, according to the reference link information of the second docking device, whether the reference link selected by the second docking device is the same as the reference link selected by itself, and if not, the first docking device is configured according to The system priority of the second docking device sets the reference link selected by the second docking device to be the same as the reference link selected by itself;

The first docking device and the second docking device are devices at both ends of the aggregation link group.

The embodiment of the present invention further provides a reference link negotiation system, where the system includes a first docking device and a second docking device, where the first docking device and the second docking device are both ends of an aggregation link group. Equipment,

The second docking device is configured to send an LACP negotiation packet to the first docking device by using all the sub-links in the aggregation link group, where the LACP negotiation packet carries the system priority of the second docking device and Reference link information; The first docking device is configured to receive an LACP negotiation packet sent by the second docking device, where the first docking device is further configured to determine, according to the reference link information of the second docking device, the second docking device Whether the selected reference link is the same as the reference link selected by itself, and if not, the reference link selected by the second docking device and the reference link selected by itself are set according to the system priority of the second docking device the same.

The embodiment of the present invention further provides a reference link negotiation device, where the device is a first docking device, and the first docking device and the second docking device are devices at both ends of the aggregation link group, and the first docking device The device includes: a receiving unit; a reference link determining unit

The receiving unit is configured to receive an LACP negotiation packet sent by the second docking device by using all the sub-links in the aggregation link group, where the LACP negotiation packet carries the system priority and the reference chain of the second docking device. Road information

The reference link determining unit is configured to determine, according to the reference link information of the second docking device, whether the reference link selected by the second docking device is the same as the reference link selected by itself, and if not, according to the The system priority of the second docking device sets the reference link selected by the second docking device to be the same as the reference link selected by itself.

Embodiments of the present invention provide a method, apparatus, and system for reference link negotiation,

The LACP negotiation packet, where the LACP negotiation packet carries the system priority of the second docking device and the reference link information, and the first docking device sets the second according to the system priority of the second docking device. The reference link selected by the docking device is the same as the reference link selected by itself. Therefore, the reference devices at both ends of the trunk interface are negotiated to select the reference links on both ends of the same sub-link to avoid inconsistency in the reference link selection. The resulting LACP Association The failure of the quotient and the failure of the trunk port. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings will be briefly described, and the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 is a schematic flowchart of a reference link negotiation method according to an embodiment of the present invention; FIG. 2 is a schematic diagram of docking a trunk port device according to an embodiment of the present invention;

3 is a schematic flow chart of another reference link negotiation method according to an embodiment of the present invention;

4 is a schematic diagram of a format of an LACP negotiation packet according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a reference link negotiation system according to an embodiment of the present invention; FIG. 6 is a reference chain according to an embodiment of the present invention; Schematic diagram of the structure of the road negotiation device.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention. As shown in FIG. 1 , a method for negotiating a reference link according to an embodiment of the present invention includes: Step 101: A first docking device receives an LACP sent by a second docking device through all sub-links in an aggregation link group. Negotiating the message, the LACP negotiation message carrying the system priority of the second docking device and the reference link information;

Step 102: The first docking device determines, according to the reference link information of the second docking device, whether the reference link selected by the second docking device is the same as the reference link selected by itself, and if not, the first The docking device sets the reference link selected by the second docking device to the reference link selected by itself according to the system priority of the second docking device;

The LACP negotiation packet, where the LACP negotiation packet carries the system priority of the second docking device and the reference link information, and the first docking device sets the second according to the system priority of the second docking device. The reference link selected by the docking device is the same as the reference link selected by itself. Therefore, the reference devices at both ends of the trunk interface are negotiated to select the reference links on both ends of the same sub-link to avoid inconsistency in the reference link selection. The LACP negotiation failed and the trunk port failed.

Further, the reference link information includes: a reference link selection flag or a reference link selection manner;

The reference link selection flag is used to indicate that the LACP negotiation packet is sent. Whether the link is a reference link, and the reference link selection mode is used to indicate that the second docking device selects a rule of the reference link.

The referenced link selection flag is carried in the Reserved field in the LACP negotiation packet. When the Reserved field is set to 1, the sub-link that sends the LACP negotiation packet is selected by the second docking device. Reference link.

The reference link selection mode includes rate priority and/or port priority priority.

The referenced link selection mode is carried in the Reserved field in the LACP negotiation packet. When the Reserved field is set to 1, the reference link selection mode is rate priority. When the Reserved field is set to 2, it indicates The sub-link selection mode is port priority first.

The LACP negotiation packet further includes a port priority and a port rate.

In one case, the first docking device sets the reference link selected by the second docking device to the reference link selected by itself according to the system priority of the second docking device:

The first docking device determines whether the system priority of the second docking device is higher than the second docking device according to the system priority of the second docking device carried in the LACP negotiation packet, if not, then:

The first docking device modifies its own reference link selection mode to the reference link selection mode of the second docking device, so that both parties select the same reference link.

In another case, the first docking device sets the reference link selected by the second docking device to the reference link selected by itself according to the system priority of the second docking device: The first docking device determines whether the system priority of the second docking device is higher than the second docking device according to the system priority of the second docking device carried in the LACP negotiation packet. If yes, then:

The first docking device sends an advertisement message to the second docking device, and advertises its own reference link selection manner, so that the second docking device unifies its reference link selection manner to the first according to the advertisement message. The reference link selection mode of the docking device, so that both parties select the same reference link; or,

The first docking device sends a negotiation message to the second docking device, and sends a reference link selection manner corresponding to each sub-link to the second docking device by using all the sub-links in the aggregation link group, so that The second docking device unifies its own reference link selection mode to the reference link selection mode of the first docking device, so that both parties select the same reference link.

In another case, the first docking device sets the reference link selected by the second docking device to the reference link selected by itself according to the system priority of the second docking device:

The first docking device determines whether the system priority of the second docking device is higher than the second docking device according to the system priority of the second docking device carried in the LACP negotiation packet, and if not, the first docking device Modifying the reference link selected by itself to the reference link selected by the second docking device according to the reference link selection flag.

The first docking device sends an advertisement message to the second docking device, and advertises the reference link selected by the first docking device, so that the second docking device unifies the reference link selected by itself to the first docking device according to the notification message. Reference link; or,

The first docking device sends a negotiation message to the second docking device, and sends a reference link identifier corresponding to each sub-link to the second docking device by using all the sub-links in the aggregation link group, so that the The second docking device may actively modify its own reference link to the reference link selected by the first docking device according to the reference link identifier of the first docking device.

After the first docking device sets the reference link selected by the second docking device to be the same as the reference link selected by the first docking device according to the system priority of the second docking device, the method further includes:

The first docking device and the second docking device respectively select the port of the negotiated reference link, and notify the peer that the port is successfully selected.

The ports of the reference link that are selected by the first docking device and the second docking device respectively include:

The first docking device and the second docking device set the attribute value Synchron i za t i on in the Ac t or - s t a t e of the negotiated reference link to 1.

Before the first docking device receives the LACP negotiation packet sent by the second interface device by using all the sub-links in the aggregation link group, the method further includes: the first pair of connection devices The configuration information is exchanged with the second docking device, and the configuration information of the peer end is obtained. The docking device (including the first docking device and the second docking device) is a router. As shown in FIG. 2, a schematic diagram of a trunk port device connection is provided in the embodiment of the present invention. The embodiment of the present invention uses two sub-links between two routers as an example for description. The number of the sub-links may be greater than two, which is not limited by the embodiment of the present invention. The docking devices at both ends of the trunk port are Router A and Router. Router A has interfaces Port A and Port B. Router B has interfaces Port Al and Port Bl. There are two sub-links between Router A and Router B: Port A— — Port Al ; Port B — Port BU A subsequent embodiment of the present invention will be described based on this architecture.

FIG. 3 is a schematic flowchart of a method for negotiating a reference link according to an embodiment of the present invention, including:

Step 301: The router A resets the state machine and resets the configuration information with the router B. As shown in Figure 4, the format of the LACP negotiation packet is as follows: The LACP negotiation packet includes at least the local information and the peer information. In the initial state, Router A and Router B have no peer information, and Router A sends an LACP negotiation packet to Router B. The LACP negotiation packet carries the local information and the peer information. There is no peer information. Therefore, the peer information in the LACP negotiation packet is the default.

It should be noted that when at least one sub-link attribute of at least one docking device at both ends of the aggregation link group is changed, the reset state machine reset of the docking device may be caused.

Step 302: Router B receives the LACP negotiation packet sent by the router A, records the configuration information of the router A to the local configuration information, and returns an LACP negotiation packet to the router A. The returned LACP negotiation packet includes the local information of the router B and the configuration information of the received router A. The information of the router A is carried in the peer information part of the returned LACP negotiation packet. Through the steps 301 and 302, the configuration information interaction process is completed, so that the docking device learns the configuration information of the peer end.

Step 303: After the configuration information interaction process is completed, the connection device (the router A or the router B, the router A is used as an example, but is not limited to the router A) to initiate the reference link negotiation process. Router A sends an LACP negotiation packet to the router B through all the sub-links in the aggregation link group. The LACP negotiation packet includes at least the local Actor_system_priority (the local system priority) and the local reference link identifier. The reference link flag is used to indicate whether the sub-link that sends the LACP negotiation message is a reference link. The priority of the local system is used to indicate the system priority of the device that sends the LACP negotiation packet. The Reserved field in the LACP negotiation packet can be used to carry the local reference link identifier. For example, The local reference link flag is set to 1 to indicate that the sub-link that the router A sends the LACP negotiation packet is a reference link, and the local reference link flag is set to 2 to indicate the router A. The sub-link that sends the LACP negotiation packet is a non-reference link. When the local reference link flag is set to 0, it is used to indicate an invalid value. It should be noted that only one sub-link can be used as the reference link in the link aggregation group that is aggregated by multiple sub-links. That is, the router A only selects the LACP negotiation packets sent by all the sub-links. The Reserved field of an LACP negotiation packet takes the value 1.

For the embodiment of the present invention, the interface device has at least the system priority of the peer end and the reference link selection flag of the peer end. The further LACP negotiation message may further include Actor_port_priority (port priority) and Actor_key (indicating the sub-link port). Attributes, including port rate, negotiation mode Information)

Step 304: Router B receives the LACP negotiation packet sent by the router A, and obtains the reference link identifier of the router A from the LACP negotiation packet, so as to determine the reference link selected by the router A. If the reference link selected by the router B is inconsistent with the reference link selected by the router A, the docking device at both ends of the aggregated link group uniquely determines one of the link aggregation groups between the router A and the router B according to the system priority of both parties. The reference link includes the following methods:

method one:

In step 303, the LACP negotiation packet sent by the router A to the router B includes the system priority of the router A. When the router B determines that the priority of the router A is higher than itself, the router B can actively modify the reference link identifier of the local end to enable the router. The reference link of B is unified with the reference link of the router A. Alternatively, when the priority of the router B is high, the negotiation message may be sent to the router A, and the negotiation message may be an LACP negotiation packet, where the LACP negotiation report is used. The reference carries the reference link identifier of Router B and the system priority of Router B. After Router A receives the negotiation message, it can determine that Router B has a higher priority than itself according to the priority information of Router B. When the reference link is different, Router A with lower priority actively modifies the reference link selected by itself to make it consistent with the reference link of Router B.

Manner 2: When the priority of the router B is high, the router can directly send an advertisement message to the router A to advertise the reference link selected by the router, so that the low-priority router A modifies its own reference link according to the advertisement message, so that both sides The reference link is unified.

Specifically, the principle of the first method is: the docking device determines the system with the higher priority according to the system priority information of the two parties, and unifies the reference link to the docking device with the higher system priority, that is, the docking device with the lower system priority. When the reference link selection of the two parties is found to be inconsistent, the reference link is actively modified to The reference link selected by the peer device with high system priority.

Step 305: After the reference link is determined, the docking device at both ends of the aggregation link performs port state selection, and the attribute value Synchronization in the Actor state corresponding to the selected reference link is set to 1, that is, both sides of the aggregation link are selected by the same child. Ports at both ends of the link, and notify the other party that the port selection is successful.

Further, in step 303, the docking device notifies the reference link selected by the peer end by referring to the link identifier. In addition, the embodiment of the present invention can also standardize the selection manner of the reference link, and carry the standardized reference chain through the Reserved field. In the path selection mode, the docking device unifies the reference link selection manner through negotiation, so that the reference links selected by the two parties are the same.

Specifically, the reference link selection mode includes rate priority and port priority priority. When the Reserved field is set to 1, the reference link selection mode is rate priority. When the Reserved field is set to 2, the reference link selection is indicated. The mode is port priority first. In the steps 303 and 304 of the embodiment of the present invention, the connection device may use the Reserved field in the LACP negotiation packet to carry the reference link selection mode, and notify the peer end of the reference link selection mode, so that the reference link selection of the two parties is selected. The mode is unified so that both parties can select the same reference link in the reference link negotiation process (similar to steps 303, 304). The specific method is similar to the description in the above embodiment, and the present invention is not described again.

An embodiment of the present invention provides a method for negotiating a link between two first modes (negotiating the same reference link flag or negotiating the same reference link selection mode) between the first docking device and the second docking device. The same reference link is used to ensure that the referenced links at both ends of the trunk interface are selected on the same sub-link through negotiation. This prevents the LACP negotiation failure and the trunk port failure caused by the inconsistent reference link selection. .

FIG. 5 is a schematic structural diagram of a reference link negotiation system according to an embodiment of the present invention, where the system includes a first docking device 501 and a second docking device 502, where The first docking device 501 and the second docking device 502 are devices at both ends of the aggregation link group, and the second docking device 502 is configured to send to the first docking device 501 by using all the sub-links in the aggregation link group. The LACP negotiation message, where the LACP negotiation message carries the system priority of the second docking device 502 and the reference link information;

The first docking device 501 is configured to receive an LACP negotiation packet sent by the second docking device 502.

The first docking device 501 is further configured to determine, according to the reference link information of the second docking device 502, whether the reference link selected by the second docking device 502 is the same as the reference link selected by itself, and if not, The reference link selected by the second docking device 502 is set to be the same as the reference link selected by itself according to the system priority of the second docking device 502.

Further, the first docking device 501 and the second docking device 502 are further configured to respectively select the port of the negotiated reference link, and notify the peer end that the port selection is successful.

The first docking device 501 and the second docking device 502 are specifically configured to set an attribute value Synchronization in the Actor-state of the negotiated reference link to L.

FIG. 6 is a schematic structural diagram of a reference link negotiation apparatus according to an embodiment of the present invention, where the apparatus is a first docking device, and the first docking device and the second docking device are an aggregation link group. End device, the first docking device includes: a receiving unit 601; a reference link determining unit 602

The receiving unit 601 is configured to receive an LACP negotiation packet sent by the second interface device by using all the sub-links in the aggregation link group, where the LACP negotiation packet carries the second pair System priority and reference link information of the connected device;

The reference link determining unit 602 is configured to determine, according to the reference link information of the second docking device, whether the reference link selected by the second docking device is the same as the reference link selected by itself, and if not, according to the The system priority of the second docking device sets the reference link selected by the second docking device to be the same as the reference link selected by itself.

The first docking device further includes a port selection advertisement unit 603, configured to notify the second docking device that the port selection is successful after the port of the negotiated reference link is selected.

The port selection advertising unit 603 is specifically configured to use the negotiated reference link.

ZA ti on is set to 1.

Embodiments of the present invention provide a method, an apparatus, and a system for referencing link negotiation, in which two methods (negotiating the same reference link flag or negotiating the same reference link selection mode) are used in the first docking device and the second docking device. The same reference link is determined between the devices, so that the reference devices at both ends of the trunk port are negotiated to select the reference links on both ends of the same sub-link to avoid the reference link selection.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a corpse, a Read-On Memory (ROM), or a Random Acce s Memory (RAM).

The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any technical person disclosed in the present invention is familiar to those skilled in the art. Variations or substitutions are readily conceivable within the scope of the invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Rights request

A method for negotiating a reference link, the method includes: the first docking device receives a link aggregation control protocol LACP negotiation report sent by the second docking device through all the sub-links in the aggregation link group. The LACP negotiation packet carries the system priority of the second docking device and the reference link information;

2. The method according to claim 1, wherein the reference link information comprises: a reference link selection flag or a reference link selection manner;

The reference link selection flag is used to indicate whether the link that sends the LACP negotiation packet is a reference link, and the reference link selection mode is used to indicate that the second docking device selects a reference link. .

The method according to claim 2, wherein the reference link selection flag is carried by a Re se rved field in the LACP negotiation packet, and when the Re ved field is set to 1, The sub-link that sends the LACP negotiation packet is the reference link selected by the second docking device.

4. The method according to claim 2, wherein the reference link selection mode comprises rate priority and/or port priority priority.

The method according to claim 4, wherein the Res rved field in the LACP negotiation message carries the reference link selection mode, and when the Re ved field is set to 1, The reference link selection mode is rate priority. When the Re ser ved field is set to 2, it indicates that the sublink selection mode is port priority priority.

The method of claim 5, wherein the LACP negotiation message further includes a port priority and a port rate.

The method according to claim 2, wherein the first docking device selects a reference link selected by the second docking device and a reference chain selected by itself according to a system priority of the second docking device The way the road is set to include:

The first docking device determines whether the system priority of the second docking device is higher than the second docking device according to the system priority of the second docking device carried in the LACP negotiation packet, and if yes,

The first docking device sends an advertisement message to the second docking device, and advertises its own reference link selection manner, so that the second docking device sets its own reference chain according to the notification message. The path selection mode is unified as the reference link selection mode of the first docking device, so that both parties select the same reference link; or

The first docking device determines whether the system priority of the second docking device is higher than the second docking device according to the system priority of the second docking device carried in the LACP negotiation packet. If yes, then:

The first docking device sends an advertisement message to the second docking device, and advertises the reference link selected by the first docking device, so that the second docking device unifies the reference link selected by itself to the first docking device according to the notification message. Reference link; or, The first docking device sends a negotiation message to the second docking device, and sends a reference link identifier corresponding to each sub-link to the second docking device by using all the sub-links in the aggregation link group, so that the The second docking device may actively modify its own reference link to the reference link selected by the first docking device according to the reference link identifier of the first docking device.

The method according to any one of claims 1 to 10, wherein the first docking device selects a reference link selected by the second docking device according to a system priority of the second docking device After the self-selected reference link is set to be the same, the method further includes: selecting, by the first docking device and the second docking device, the port of the negotiated reference link, and notifying the peer that the port is successfully selected.

The method of claim 11, wherein the first docking device and the second docking device respectively select the ports of the negotiated reference link include:

The first docking device and the second docking device set the attribute value Synchronization in the Ac t or - s t a t e of the negotiated reference link to 1.

The method according to any one of claims 1 to 10, wherein before the first docking device receives the LACP negotiation message sent by the second docking device through all the sub-links in the aggregation link group, The method further includes: the first docking device interacts with the second docking device to obtain configuration information of the peer end.

The method according to claim 13, wherein before the configuration information interaction, the method further comprises:

At least one of the at least one docking device at both ends of the aggregated link group changes.

15. The method of claim 1, wherein the docking device is a road By the device.

A reference link negotiation system, wherein the system includes a first docking device and a second docking device, and the first docking device and the second docking device are devices at both ends of the aggregation link group. ,

The second docking device is configured to send, by using the link aggregation control protocol LACP negotiation packet sent by the first connection device, all the sub-links in the aggregation link group, where the LACP negotiation packet carries the second docking device System priority and reference link information;

The first docking device is configured to receive an LACP negotiation packet sent by the second docking device, where the first docking device is further configured to determine, according to the reference link information of the second docking device, the second docking device Whether the selected reference link is the same as the reference link selected by itself, and if not, the reference link selected by the second docking device and the reference link selected by itself are set according to the system priority of the second docking device the same.

The system according to claim 16, wherein the first docking device and the second docking device are further configured to respectively select a port of the negotiated reference link, and notify the peer to select a port. success.

The system according to claim 17, wherein the first docking device and the second docking device are specifically configured to use an attribute in the Ac t or - state of the negotiated reference link. The value Synchronization is set to 1.

A device for negotiating a reference link, wherein the device is a first docking device, and the first docking device and the second docking device are devices at both ends of the aggregation link group, and the first docking device is Including: receiving unit; reference link determining unit

The receiving unit is configured to receive the second docking device by aggregating all the groups in the link group The link aggregation control protocol LACP negotiation packet sent by the sub-link, the LACP negotiation packet carrying the system priority of the second docking device and the reference link information;

The device of claim 19, wherein the first docking device further comprises a port selection advertising unit, configured to notify the second docking device after selecting the port of the negotiated reference link The port selection was successful.

The device according to claim 20, wherein the port selection and advertising unit is configured to set an attribute value Synchronization in the Ac t or _ s ta te of the negotiated reference link to 1 .