JP2013192022A - Network device, link aggregation system and redundancy method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network device capable of using a standby port for another link aggregation group when one of a plurality of ports in one link aggregation group becomes faulty.SOLUTION: In the network device, a plurality of link aggregation groups having different redundancy policy are configured in one switch when forming a redundant configuration using LACP, and a standby link is provided in common to the plurality of link aggregation groups. When one of a plurality of links in one link aggregation group becomes faulty, the network device includes management means (11) for assigning the standby link to the failed link to form an operation system.

Description

  The present invention relates to a network device, a link aggregation system, and a redundancy method used therefor, and more particularly, to a redundancy method for a plurality of link aggregation groups included in one network device.

  When one network device has a plurality of link aggregation groups, there is no established method for assigning a spare port to any link aggregation group instead of preparing a spare port for each link aggregation. .

  In a communication carrier, a voice communication network such as RTP (Real time Transport Protocol) and a line management communication network such as SNMP (Simple Network Management Protocol) are provided and managed as separate communication networks.

  However, assuming that the communication of both voice communication network and line management communication network is mixed in one network device and divided by link aggregation group, a spare port is prepared for each link aggregation. Then, if a failure occurs in any of multiple ports that belong to one link aggregation group, there are spare ports for other link aggregation ports, but there are link aggregation groups that do not have enough spare ports. Come.

  As a method for redundancy in the link aggregation group as described above, there are techniques described in Patent Documents 1 to 3 below.

Japanese Patent No. 4155105 JP 2008-160227 A Japanese Patent Application Laid-Open No. 2011-228921

  In the technique described in Patent Document 1 described above, when a redundant configuration is made using LACP (Link Aggregation Control Protocol), one or more spare links for failure are set for one link aggregation group Is possible.

  However, the technology described in Patent Document 1 does not assume a configuration in which a plurality of link aggregation groups exist for one switch, and when these technologies are applied to such a switch, the number of spare links However, since the number of link aggregation groups increases, the utilization efficiency of the entire switch is poor.

  Further, in the technology described in Patent Document 2, a configuration in the case where a plurality of link aggregation groups exist for one switch is not assumed, and the use efficiency for the case where a plurality of spare links exist is assumed. A good management method, for example, a method for deciding which spare link to use preferentially among a plurality of spare links is not considered.

  Furthermore, the technique described in Patent Document 3 does not show a method for distinguishing and setting spare ports for link aggregation groups having different redundancy policies.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and to use a spare port for another link aggregation group when any of a plurality of ports of one link aggregation group fails. An apparatus, a link aggregation system, and a redundancy method used for them.

A network device according to the present invention is a network device in which a plurality of link aggregation groups each having a different redundancy policy are constructed in one switch when a redundant configuration is made using LACP (Link Aggregation Control Protocol),
A common spare link for each of the plurality of link aggregation groups is provided,
When any of a plurality of links in one link aggregation group fails, a management unit is provided which assigns the spare link to the failed link and sets it as an active system.

  A link aggregation system according to the present invention includes the network device described above.

In the redundancy method according to the present invention, when a redundant configuration is made using LACP (Link Aggregation Control Protocol), redundancy is used for a network device in which a plurality of link aggregation groups each having a different redundancy policy are constructed in one switch. A method,
In the network device, a common spare link for each of the plurality of link aggregation groups is provided,
The network device executes management processing for assigning the spare link to the failed link and setting it as an active system when any of a plurality of links in one link aggregation group fails.

  By adopting the above-described configuration and operation, the present invention can use a spare port for another link aggregation group when any of a plurality of ports in one link aggregation group fails. The effect is obtained.

It is a block diagram which shows the structural example of the network apparatus by embodiment of this invention. It is a figure which shows the connection state of the port in embodiment of this invention. It is a figure which shows the state which used the backup link by generation | occurrence | production of the line failure in embodiment of this invention. It is a figure which shows the connection state of the port in the technique of patent document 1. FIG. It is a figure which shows an example of the setting content of the SBY setting table by embodiment of this invention. It is a flowchart which shows the failure switching algorithm of the network device by embodiment of this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. First, an outline of a network device according to the present invention will be described.

  In the network device according to the present invention, when a redundant configuration is made using LACP (Link Aggregation Control Protocol), a spare link for each of a plurality of link aggregation groups constructed in one switch and having a different redundancy policy is assigned as one. An efficient redundant configuration is realized by enabling common setting to one or more physical links.

  In the technique described in Patent Document 1 described above, one or more spare links are required for one link aggregation group. However, in the present invention, other link aggregation groups are used in terms of individual link aggregation groups. Since the spare link assigned to can also be used, redundancy performance is improved.

  On the other hand, in the present invention, in the technique described in Patent Document 1, spare links that each of the plurality of link aggregation groups have can be aggregated into a smaller number of physical ports. It is also possible to reduce the number of spare links.

  Further, in the present invention, when there are a plurality of link aggregations for voice communication, those spare links are shared, and the link aggregation spare link for line management communication is not shared with the voice communication spare link. , Detailed management such as separate management is also possible.

  The present invention solves the above-described problems by the following features.

  In the present invention, the physical port state is determined as ACT (activate) based on the synchronization bit in the Actor_State field of the LACPDU (Link Aggregation Control Protocol Data Unit) and the Synchronization bit in the Partner_State field. It has a LACP protocol processing unit that can determine whether a failure has occurred.

  The LACP protocol processing unit determines ACT if the Synchronization bit in the Actor_State field is TRUE and the Synchronization bit in the Partner_State field is TRUE. The LACP protocol processing unit notifies the failure management unit of an ACT failure notification when the state of the corresponding port changes from ACT to failure.

  The failure management unit blocks the backup link line until the failure is detected. The state of this spare link is SBY (standby). A port that is SBY is defined as an SBY port.

  In the failure management unit, when a failure is detected (when an ACT failure notification is received), there is a physical port in which SBY setting (see FIG. 5) corresponding to the link aggregation group to which the failed physical port belongs is set. If the physical port is found, the same LACP setting (port priority, key, mode) as that of the failed port is performed for the physical port.

  When a plurality of physical ports are found, a physical port (ACT candidate port) for performing LACP setting is selected according to the priority (ACT priority) set as the SBY setting. After performing LACP setting for the ACT candidate port, delete the LACP setting of the failed port, delete the SBY setting for the ACT candidate port, release the block of the line of the ACT candidate port, and replace the failed port ACT candidate ports are converted into ACTs and added to the operational system.

  Since the protection link at the time of failure detection is converted to ACT and the physical port that has failed is recovered during processing to be added to the active system, it may fall into an unexpected state. Block any ports that have become unusable.

  The network devices having the above characteristics are opposed to each other, and the same LACP setting (key information setting for each port) and SBY setting are set for each network device. However, even in the LACP setting, the key value and port number of link aggregation may be different in each device (the key values of the link aggregation groups of Switch A 101 and Switch B 102 in FIG. 2 are different from each other). Switch A 101 port 1 may be connected to Switch B 102 port 2, and Switch A 101 port 2 may be connected to Switch B 102 port 1).

  The ACT priority value of the SBY setting does not necessarily match between the opposing network devices, but is set so that the priority order of each port is the same between the opposing network devices.

  According to the present invention, SBY ports can be set differently for link aggregation groups having different redundancy policies. In the present invention, in FIG. 2, the SBY ports for keys = 1 and 2 are ports 5 and 6, and the SBY ports for key = 3 are ports 7.

  The technique described in Patent Document 3 does not show a method for distinguishing and setting SBY ports for link aggregation groups having different redundancy policies. Therefore, in the technique described in Patent Document 3, the SBY ports for keys = 1, 2, 3 can only be changed to ports 5, 6, 7 in FIG.

  As an example of assigning ring aggregation groups with different redundancy policies, traffic of key = 1, 2 is assigned to voice communication, line management communication is assigned to key = 3, and many SBY ports are assigned to voice communication. Therefore, it is possible to selectively use a small number of SBY ports for line management communication.

  FIG. 1 is a block diagram showing a configuration example of a network device according to an embodiment of the present invention. In FIG. 1, the network device according to the embodiment of the present invention includes a failure management unit 11, a LAN (Local Area Network) conduction driver 12, a LACP protocol processing unit 13, and an SBY setting table 14.

  The LACP protocol processing unit 13 determines whether the state of the physical port is ACT or a failure by looking at the Synchronization bit in the Actor_State field of the LACPDU and the Synchronization bit in the Partner_State field.

  The LACP protocol processing unit 13 determines ACT if the Synchronization bit in the Actor_State field is TRUE and the Synchronization bit in the Partner_State field is TRUE. The LACP protocol processing unit 13 notifies the failure management unit 11 of an ACT failure notification when the state of the corresponding port changes from ACT to failure.

  The failure management unit 11 blocks the backup link line until the failure is detected. The spare link state is SBY. A port that is SBY is defined as an SBY port.

  In the failure management unit 11, when a failure is detected (when an ACT failure notification is received), the failure management unit 11 checks whether there is a physical port for which the SBY setting corresponding to the link aggregation group to which the failed physical port belongs is set. If a physical port is found, the same LACP setting (port priority, key, mode) as that of the failed port is performed on the physical port.

  When a plurality of physical ports are found, the failure management unit 11 selects a physical port (ACT candidate port) for performing LACP setting according to the priority (ACT priority) set as the SBY setting. After performing the LACP setting for the ACT candidate port, the failure management unit 11 deletes the LACP setting of the failed port, deletes the SBY setting for the ACT candidate port, releases the block of the line of the ACT candidate port, ACT candidate ports are converted into ACTs instead of the changed ports and added to the operational system.

  Since the protection link at the time of failure detection is converted to ACT and the physical port that has failed is recovered during processing to be added to the active system, it may fall into an unexpected state. Block any ports that have become unusable.

  2 is a diagram showing a connection state of ports in the embodiment of the present invention, and FIG. 3 is a diagram showing a state in which a spare link is used due to the occurrence of a line failure in the embodiment of the present invention. These are figures which show the connection state of the port in the technique of said patent document 1. FIG.

  FIG. 4 shows a connection state of ports in the technique described in Patent Document 1 that requires one or more spare links for one link aggregation group.

  FIG. 2 shows that, according to this embodiment, SBY setting is performed for both the port 3 and the port 5 of FIG. 4 so that two link aggregation groups with key = 1 and key = 2 of Switch A101 have a common spare link. It is a thing. However, although port 3, port 5, and port 7 are SBY ports in FIG. 4, in FIG. 2, the SBY ports are gathered into port 5, port 6, and port 7 for the sake of clarity.

  FIG. 3 shows a state after a failure has occurred in the port 2 which was ACT in FIG. 2, and then the port 6 is converted to ACT according to the failure switching algorithm described later.

  When a line failure occurs for port 2 that was ACT, the line of port 2 is blocked and the LACP setting (port priority, key, mode) is deleted. For port 6, the LACP setting set for port 2 is set without change, the SBY setting (see FIG. 5) is deleted, and the blockage of the line is released.

  FIG. 5 is a diagram showing an example of setting contents of the SBY setting table 14 according to the embodiment of the present invention. The SBY setting is set for each physical port. A plurality of key information and ACT priority can be set in the physical port.

  The ACT priority has a restriction that the same value cannot be set between different ports. As a result, it is possible to uniquely determine which port is to be ACTed next among physical ports in the SBY state only by the value of the ACT priority. As for the ACT priority, priority is given to a smaller value.

  In terms of key information units, the same key can be set for a plurality of SBY physical ports (for example, the same key information key = 1 can be set for port 5 and port 6).

  FIG. 1 shows functional blocks related to a failure switching function of a network device according to an embodiment of the present invention. The failure management unit 11 receives an ACT failure notification from the LACP protocol processing unit 13 and detects that the physical port has transitioned from ACT to failure.

  The check of the Synchronization bit value in the Actor_State field of the LACPDU and the Synchronization bit value in the Partner_State field is implemented by the LACP protocol processing unit 13, and only when the port state transitions from ACT to SBY, the failure management unit 11 Notice.

  Regardless of whether the port state transitions from ACT to SBY, the LACP protocol processor 13 notifies the fault manager 11 of all LACPDU information, and the fault manager 11 checks the transition from ACT to SBY. This method can be implemented, but in order to reduce unnecessary communication, a bit value check is performed by the LACP protocol processing unit 13, and the failure management unit 11 is notified only when the port state transitions from ACT to SBY. Is good.

  Upon receiving an ACT failure notification from the LACP protocol processing unit 13, the failure management unit 11 refers to the SBY setting table 14 and performs the following processing when an SBY port (ACT candidate port) that can be ACTed is found.

  The failure management unit 11 issues a processing request to the LAN continuity driver 12 to block the failed port. Next, the failure management unit 11 deletes the LACP setting of the failed port.

  Subsequently, the failure management unit 11 directly reflects the LACP setting (port priority, key, mode) of the failed port on the ACT candidate port. Thereafter, the failure management unit 11 issues a processing request to the LAN continuity driver 12 to release the blockage of the ACT candidate port.

  FIG. 6 is a flowchart showing a failure switching algorithm of the network device according to the embodiment of the present invention. With reference to FIGS. 1 to 6, a network device failure switching algorithm according to an embodiment of the present invention will be described.

  The LACP protocol processing unit 13 checks the value of the Synchronization bit in the Actor_State field and the value of the Synchronization bit in the Partner_State field for the LAC PDU transmitted / received by each port, and both bits are set to either one from the TRUE state. When the bit becomes FALSE, it is considered that the port has changed from ACT to SBY, and the failure management unit 11 is notified of the ACT failure (step S1 in FIG. 6).

  The failure management unit 11 checks the SBY setting to determine whether there is an SBY port having the same key information as the failed port key information. If it does not exist, there is no ACT candidate port. If there is one, that port is set as an ACT candidate port. If there are a plurality of ports, the port with the smallest ACT priority value is set as the ACT candidate port (steps S2 and S3 in FIG. 6).

  It is assumed that the same ACT priority value is not set for different ports. In this embodiment, it is assumed that the same value is not allowed to be set by checking when setting SBY settings or checking SBY settings at startup.

  The failure management unit 11 issues a processing request for closing the failed port (failure port) to the LAN conduction driver 12 (step S4 in FIG. 6). The failure port is blocked at this timing in order to avoid a plurality of ACT failure notifications being sent to the failure management unit 11 when the failure port repeats ACT and a failure state during switching. is there.

  The failure management unit 11 performs the same LACP setting as the LACP setting (port priority, key, mode) of the failed port on the ACT candidate port (step S5 in FIG. 6). In the present embodiment, the LACP setting is inserted before the failure port is released from blocking, so that packets other than the link aggregation group to which the failure port belongs are prevented from being conducted.

  The failure management unit 11 deletes the LACP setting of the failed port. Also, the failure management unit 11 deletes the SBY setting of the ACT candidate port (step S6 in FIG. 6). Further, the failure management unit 11 issues a processing request for releasing the blocking of the failed port to the LAN conduction driver 12 (step S7 in FIG. 6).

  As shown in FIG. 2, for Switch A101 and Switch B102 in which the SBY setting is set to ports 5 to 7, a failure occurs in the route of port 2, and ACT is substituted for the route of port 2 in which port 6 has failed. The operation will be described. FIG. 3 shows a state after a failure occurs in the route of port 2 in FIG. 2 and port 6 becomes ACT.

  When a failure occurs in the route of port 2 in FIG. 2, the LACPDU in which the value of the Synchronization bit in the Actor_State field and the value of the Synchronization bit in the Partner_State field are both TRUE is transmitted / received. The LACPDU whose bit is set to FALSE is turned on.

  In accordance with the failure switching algorithm shown in FIG. 6, the LACP protocol processing unit 13 performs “transmission / reception of a LACPDU in which the value of the Synchronization bit in the Actor_State field and the value of the Synchronization bit in the Partner_State field satisfy both“ TRUE ”. When a change to a state of transmitting / receiving a LACPDU in which both the value of the Synchronization bit in the Actor_State field and the value of the Synchronization bit in the Partner_State field do not satisfy TRUE is detected, an ACT failure notification is issued to the failure management unit 11.

  The fault management unit 11 confirms the SBY setting table 14 shown in FIG. 5 according to the fault switching algorithm shown in FIG. 6, and the ports 5 and 6, which are SBY ports having the same key information as the key = 1 of the faulty port 2, Port 6 having a small ACT priority value is selected as an ACT candidate port.

  The failure management unit 11 closes the failed port 2 according to the failure switching algorithm shown in FIG. 6, performs the same LACP setting (port priority, key, mode) as the port 2 on the port 6 which is an ACT candidate port, The LACP setting of 2 is deleted, the SBY setting of port 6 is deleted, and the blockage of port 6 is released, so that the failure switching is completed and the state shown in FIG. 3 is obtained.

  As described above, in this embodiment, the spare port of each link aggregation group is made common, so that when any of the plurality of ports of one link aggregation group becomes a failure, the spare port is shared. Compared to the case where it is not realized, a spare port for another link aggregation group can be used.

  Further, in the present embodiment, by sharing the spare ports of the respective link aggregation groups, it is possible to reduce the spare ports as compared with the case where they are not shared.

  Furthermore, in the present embodiment, when there are three or more link aggregation groups, the spare ports of the same link aggregation group with the same redundancy policy are shared, and the spare ports are separated for the link aggregation groups with different redundancy policies. It is possible to make detailed settings such as

  In the present invention, in the above-described embodiment, only two configurations of Switch A and Switch B are shown, but one device may be connected to two or more devices.

  Even when two or more devices are connected, if the opposing device complies with the operation of the present invention and satisfies the following conditions, ACT conversion of the SBY port can be realized when a failure occurs.

  In other words, in the present invention, the same LACP setting (key information setting for each port) and SBY setting are set for each port in each device. However, even in the LACP setting, the key value and the port number for link aggregation may be different for each device.

  For example, port 1 of Switch A101 in FIG. 2 may be connected to port 2 of Switch B102, and port 2 of Switch A101 may be connected to port 1 of Switch B102.

  Further, the ACT priority value of the SBY setting does not necessarily match between the opposing devices, but is set so that the priority order of each port is the same between the opposing devices.

11 Fault Management Unit 12 LAN Continuity Driver 13 LACP Protocol Processing Unit 14 SBY Setting Table 101 Switch A
102 Switch B

Claims (9)

When a redundant configuration is made using LACP (Link Aggregation Control Protocol), a plurality of link aggregation groups each having a different redundancy policy are constructed in one switch,
A common spare link for each of the plurality of link aggregation groups is provided,
A network device, comprising: a management unit that allocates the spare link to the failed link and sets it as an active system when any of a plurality of links in one link aggregation group fails. LACP protocol processing means for notifying the management means of failure when a failure occurs from a state where the link is in a conductive state,
When receiving the failure notification, the management means checks whether there is a spare link corresponding to the link aggregation group to which the failed link belongs, and if there is a spare link, The network apparatus according to claim 1, wherein the same LACP setting as that of the link in which the failure has occurred is performed.   3. The network apparatus according to claim 2, wherein the management unit selects a link for performing the LACP setting according to a preset priority when a plurality of the spare links are found.   4. The network device according to claim 1, wherein the plurality of link aggregation groups include at least a link aggregation group for voice communication and a link aggregation group for line management communication. 5.   A link aggregation system comprising the network device according to any one of claims 1 to 4. A redundancy method used in a network device in which a plurality of link aggregation groups each having a different redundancy policy are configured in one switch when a redundant configuration is made using LACP (Link Aggregation Control Protocol),
In the network device, a common spare link for each of the plurality of link aggregation groups is provided,
The network device executes management processing for assigning the spare link to the failed link and setting it as an active system when any of a plurality of links in one link aggregation group fails. Redundancy method. The network device executes LACP protocol processing for notifying the management means of a failure when a failure occurs from a state where the link is in a conductive state,
When the network device receives the failure notification in the management process, the network device confirms whether there is a spare link corresponding to the link aggregation group to which the failed link belongs, and if there is the spare link 7. The redundancy method according to claim 6, wherein the same LACP setting as that of the link in which the failure has occurred is performed on the spare link.   8. The redundancy method according to claim 7, wherein the network device selects a link for performing the LACP setting according to a preset priority when a plurality of the spare links are found in the management process.   9. The redundancy method according to claim 6, wherein the plurality of link aggregation groups include at least a link aggregation group for voice communication and a link aggregation group for line management communication.

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