JP7342611B2 - Communication device, control method for communication device, and communication system - Google Patents

Description

The present disclosure relates to a communication device, a method of controlling a communication device, and a communication system.

Link aggregation is a technology that bundles multiple physical ports and treats them as one logical link. The standard regarding link aggregation is described in IEEE Std 802.1AX (registered trademark)-2014 (Non-Patent Document 1). The above standard defines LACP (Link Aggregation Control Protocol), which is a protocol for dynamically controlling link aggregation.

As an extension of LACP, there is a minimum-links function. The minimum-links function is a minimum bandwidth control function that determines whether a logical link is valid according to the number of physical links in a communicable state. Note that the minimum-links function itself is not defined in IEEE Std 802.1AX (registered trademark)-2014. Therefore, for example, a vendor providing communication equipment such as a router or a switch can independently specify the minimum-links function. The minimum-links function is, for example, the following non-patent document 2 (https://www.cisco.com/c/en/us/td/docs/ios/cether/configuration/guide/ce_lnkbndl.html) or the non-patent It is explained in Document 3 (https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/802-3ad-minimum-links.html).

For example, US Patent Application Publication No. 2017/0063672 (Patent Document 1) discloses embedding information (ACTOR_CONFIG_NUM_ACTIVE_PORTS) indicating the number of physical links in a communicable state in the Reserve area of an LACP packet. According to this method, it is possible to accurately determine the number of physical links that allow connected devices to communicate with each other.

For example, in US Pat. No. 8,243,594 (Patent Document 2), when a plurality of logical links are further grouped and the communicable logical links within that group reach the lowest bandwidth, communication of the logical links belonging to the group is stopped. Disclose what you authorize.

Japanese Unexamined Patent Publication No. 2002-232427 (Patent Document 3) monitors traffic volume, dynamically moves member ports between logical links, equalizes traffic imbalances on physical links, and dynamically changes bandwidth. Disclose what you will do.

US Patent Application Publication No. 2017/0063672 US Patent No. 8243594 Japanese Patent Application Publication No. 2002-232427

IEEE Computer Society, IEEE Std 802.1AX-2014 "IEEE Standard for Local and metropolitan area networks - Link Aggregation", p.11-89 "Feature Information for Configuring IEEE 802.3ad Link Bundling and Load Balancing", [Retrieved October 1, 2019], Internet <https://www.cisco.com/c/en/us/td/docs/ios/cether /configuration/guide/ce_lnkbndl.html> "Configuring Aggregated Ethernet Minimum Links", [Retrieved October 1, 2019], Internet <https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/802-3ad-minimum-links. html>

As mentioned above, Non-Patent Document 1 does not describe minimum bandwidth control. Furthermore, in Non-Patent Document 2 and Non-Patent Document 3, since the number of physical links in a communicable state has not reached the value of min-links, communication between the own device and the opposite device is impossible. It does not specify how the state is expressed on the LACP packet.

On the other hand, in the method disclosed in Patent Document 1, in order to grasp the number of physical links in which both the own device and the opposite device can communicate, the item ACTOR_CONFIG_NUM_ACTIVE_PORTS in the LACP packet is required for both the own device and the opposite device. must be able to be referenced. Therefore, if only one of the two devices is capable of operating ACTOR_CONFIG_NUM_ACTIVE_PORTS, it is not possible to know the number of physical links in a communicable state.

The method disclosed in Patent Document 2 can be applied when it is desired to control the minimum bandwidth of an ECMP (Equal-cost multi-path routing) route that can pass through a plurality of logical links for one route. However, Patent Document 2 does not mention a physical link control method for controlling the minimum bandwidth of a logical link. Further, Patent Document 3 also does not mention a physical link control method for minimum bandwidth control.

An object of the present disclosure is to match the valid states of logical links between devices that exchange LACP packets in link aggregation.

According to the present disclosure, a communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and the communication device dynamically controls link aggregation according to LACP. the LACP packet transmitting/receiving unit that transmits and receives LACP packets for the purpose of the present invention, and a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet, and the minimum bandwidth control unit is in a state in which it is possible to transmit LACP packets. Whether or not the number of physical links has reached the number of links corresponding to the minimum bandwidth of the communication device is notified to the opposing device using the Aggregation flag included in the LACP packet.

According to the present disclosure, a communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and the communication device dynamically controls link aggregation according to LACP. the LACP packet transmitting/receiving unit that transmits and receives LACP packets for the purpose of the present invention, and a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet, and the minimum bandwidth control unit is in a state in which it is possible to transmit LACP packets. Whether or not the number of physical links has reached the number of links corresponding to the minimum bandwidth of the communication device is notified to the opposing device using the Collecting flag and the Distributing flag included in the LACP packet.

According to the present disclosure, a communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and the communication device dynamically controls link aggregation according to LACP. the LACP packet transmitting/receiving unit that transmits and receives LACP packets for the purpose of the present invention, and a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet, and the minimum bandwidth control unit is in a state in which it is possible to transmit LACP packets. It has a first mode and a second mode for notifying the opposite device whether the number of physical links has reached the number of links corresponding to the minimum bandwidth of the communication device, and the first mode is LACP. This is a mode in which the Aggregation flag included in the packet notifies the opposing device that the number of physical links that are ready for transmission has reached the number of links that corresponds to the minimum bandwidth of the communication device. , is a mode in which the Collecting flag and the Distributing flag included in the LACP packet notify the opposing device that the number of physical links that are ready for transmission has reached the number of links corresponding to the minimum bandwidth of the communication device.

According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), determining whether the number of physical links in a state in which LACP packets for controlling link aggregation according to LACP can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device; and and enabling an aggregation flag included in the LACP packet when the number of physical links in the LACP packet reaches the number of links corresponding to the minimum bandwidth of the communication device.

According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), determining whether the number of physical links in a state in which LACP packets for controlling link aggregation according to LACP can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device; and and enabling a Collecting flag and a Distributing flag included in the LACP packet when the number of physical links in the LACP packet reaches the number of links corresponding to the minimum bandwidth of the communication device.

According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), a step of selecting one of the first mode and the second mode, and determining the number of physical links capable of transmitting LACP packets for controlling link aggregation according to LACP according to the selected mode; In the first mode, the number of physical links that are ready for transmission is determined by the aggregation flag included in the LACP packet. This mode notifies the other device that the number of links corresponding to the minimum bandwidth of This mode notifies the opposing device that the number of links has reached the minimum bandwidth of the communication device.

According to the present disclosure, a communication system includes a first communication device and a second communication device, each of which dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). each of the first communication device and the second communication device includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP, and an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP; and a minimum bandwidth control unit that determines whether the number of physical links in a state in which LACP packets can be transmitted has reached the number of links corresponding to the minimum bandwidth of each communication device. , the opposite device is notified by the Aggregation flag included in the LACP packet.

According to the present disclosure, a communication system includes a first communication device and a second communication device, each of which dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). each of the first communication device and the second communication device includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP, and an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP; and a minimum bandwidth control unit that determines whether the number of physical links in a state in which LACP packets can be transmitted has reached the number of links corresponding to the minimum bandwidth of each communication device. , the opposite device is notified by the Collecting flag and the Distributing flag included in the LACP packet.

According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), enabling an Aggregation flag in both the LACP packet transmitted from the communication device and the LACP packet received by the communication device; and after the Aggregation flag is enabled, the LACP packet transmitted from the communication device and the communication device enabling a Synchronization flag in both the received LACP packets and, after the Synchronization flag is enabled, Collecting flags and Distributing flags in both the LACP packets transmitted from the communication device and the LACP packets received by the communication device; and enabling the flag.

According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), enabling an Aggregation flag in both LACP packets transmitted from the communication device and LACP packets received by the communication device; and in both LACP packets transmitted from the communication device and LACP packets received by the communication device. enabling a Collecting flag and a Distributing flag, and enabling a Synchronization flag in both LACP packets transmitted from the communication device and LACP packets received by the communication device after the Collecting flag and the Distributing flag are enabled; and a step.

According to the present disclosure, in link aggregation, it is possible to match the validity states of logical links between devices that exchange LACP packets.

FIG. 1 is a block diagram schematically showing the configuration of a communication system including communication equipment according to an embodiment of the present disclosure. FIG. 2 is a block diagram showing an example of the configuration of the communication device shown in FIG. FIG. 3 is a diagram showing an example of the structure of an LACP packet. FIG. 4 is a diagram showing the structure of the item Actor_State in LACPDU. FIG. 5 is a diagram illustrating an example in which the logical link states between the own device and the opposing device may become inconsistent. FIG. 6 is a sequence diagram for explaining minimum bandwidth control according to the first embodiment of the present disclosure. FIG. 7 is a flowchart for explaining the flow of the control process shown in FIG. 6. FIG. 8 is a flowchart showing an example of minimum bandwidth control executed while a logical link is valid. FIG. 9 is a sequence diagram for explaining minimum bandwidth control according to the second embodiment of the present disclosure. FIG. 10 is a flowchart for explaining the flow of the control process shown in FIG. FIG. 11 is a flowchart illustrating an example of minimum bandwidth control executed while a logical link is valid in Embodiment 2 of the present disclosure. FIG. 12 is a flowchart illustrating an example of minimum bandwidth control according to Embodiment 3 of the present disclosure.

[Description of embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.

(1) According to the present disclosure, a communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and is a communication device that dynamically controls link aggregation according to LACP (Link Aggregation Control Protocol). It includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling aggregation, and a minimum bandwidth control unit that determines the validity of a logical link based on the LACP packet, and the minimum bandwidth control unit is capable of transmitting LACP packets. Whether or not the number of physical links in the state has reached the number of links corresponding to the minimum bandwidth of the communication device is notified to the opposing device using the Aggregation flag included in the LACP packet.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets. By checking the flag of the LACP packet sent from the other party, the communication device can determine whether the number of physical links has reached the minimum number of links of the other party. Even if different min-links numbers are set between communication devices, the logical link will not become valid until the larger of the two min-links numbers is satisfied. Therefore, it is possible to match the states of logical links between two communication devices.

(2) In the communication device according to (1), the minimum bandwidth control unit receives the LACP packet from the opposite device, and determines whether the opposite device can transmit the LACP packet based on the aggregation flag included in the received LACP packet. If it is determined that the number of physical links in the state has reached the number of links corresponding to the minimum bandwidth of the communication device, the Synchronization flag is enabled in the LACP packet from the communication device.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(3) According to the present disclosure, the communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link. It includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling aggregation, and a minimum bandwidth control unit that determines the validity of a logical link based on the LACP packet, and the minimum bandwidth control unit is capable of transmitting LACP packets. Whether or not the number of physical links in the state has reached the number of links corresponding to the minimum bandwidth of the communication device is notified to the opposing device using the Collecting flag and the Distributing flag included in the LACP packet.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets. By checking the flag of the LACP packet sent from the other party, the communication device can determine whether the number of physical links has reached the minimum number of links of the other party. Even if different min-links numbers are set between communication devices, the logical link will not become valid until the larger of the two min-links numbers is satisfied. Therefore, it is possible to match the states of logical links between two communication devices.

(4) In the communication device according to (3), the lowest bandwidth control unit receives the LACP packet from the opposite device, and uses the Collecting flag and Distribution flag included in the received LACP packet to cause the opposite device to control the LACP packet. If it is determined that the number of physical links in a transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device, the synchronization flag is enabled in the LACP packet from the communication device.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(5) In the communication device according to (1) to (4), the lowest bandwidth control unit receives the LACP packet from the opposite device, and determines whether the opposite device can transmit the LACP packet based on the Synchronization flag included in the received LACP packet. If it is determined that the number of physical links that are in a state where they can transmit has reached the number of links corresponding to the minimum bandwidth of the communication device, the physical link is added to the valid members of the logical links.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(6) In the communication device according to (1) or (2), the minimum bandwidth control unit is configured to control a physical link in which both the Aggregation flag and the Synchronization flag are valid in the LACP packet from the opposite device when the logical link is valid. If it is determined that the number of links is less than the number of links corresponding to the lowest bandwidth of the communication device, the logical link is invalidated and the logical link is rebuilt.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(7) In the communication device according to (3) or (4), the minimum bandwidth control unit receives the LACP packet sent from the opposite device, and controls the synchronization flag, collecting flag, and If it is determined that the number of physical links associated with the Distributing flag is less than the number of links corresponding to the minimum bandwidth of the communication device, the logical link is invalidated and the logical link is rebuilt.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(8) According to the present disclosure, the communication device is a communication device that dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), and includes links that follow LACP. It includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling aggregation, and a minimum bandwidth control unit that determines the validity of a logical link based on the LACP packet, and the minimum bandwidth control unit is capable of transmitting LACP packets. It has a first mode and a second mode for notifying the opposing device whether the number of physical links in the state has reached the number of links corresponding to the minimum bandwidth of the communication device, and the first mode is a mode in which the Aggregation flag included in the LACP packet notifies the opposing device that the number of physical links that are ready for transmission has reached the number of links corresponding to the minimum bandwidth of the communication device. This mode is a mode in which the Collecting flag and Distributing flag included in the LACP packet notify the opposing device that the number of physical links that are ready for transmission has reached the number of links corresponding to the minimum bandwidth of the communication device. It is.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets. Furthermore, since the communication device has two modes for minimum bandwidth control, more flexible control depending on the connection partner is possible.

(9) According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). and determining whether the number of physical links in a state in which LACP packets for controlling link aggregation according to LACP can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device; The method includes the step of validating an aggregation flag included in the LACP packet when the number of physical links in a possible state has reached the number of links corresponding to the minimum bandwidth of the communication device.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(10) According to the present disclosure, there is provided a communication device control method for dynamically controlling link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising link aggregation according to LACP. determining whether the number of physical links in a state in which LACP packets for control can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device; reaches the number of links corresponding to the minimum bandwidth of the communication device, enabling the Collecting flag and the Distributing flag included in the LACP packet.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(11) According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). a step of selecting one of the first mode and the second mode; and determining the number of physical links in a state in which LACP packets for controlling link aggregation according to LACP can be transmitted according to the selected mode. In the first mode, the number of physical links in a transmittable state is determined by the aggregation flag included in the LACP packet. , is a mode that notifies the opposing device that the number of links corresponding to the minimum bandwidth of the communication device has been reached, and the second mode is a mode in which the LACP packet is in a state where it can be transmitted by the Collecting flag and the Distributing flag included in the packet. This is a mode in which the opposing device is notified that the number of physical links has reached the number of links corresponding to the minimum bandwidth of the communication device.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets. Furthermore, by being able to select the mode for lowest bandwidth control from the two modes, more flexible control depending on the connection partner becomes possible.

(12) According to the present disclosure, a communication system includes a first communication device and a second communication device, each of which dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). Each of the first communication device and the second communication device includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP, and a The minimum bandwidth control unit determines whether the number of physical links in a state where LACP packets can be transmitted has reached the number of links corresponding to the minimum bandwidth of each communication device. Whether this is the case is notified to the opposite device using the Aggregation flag included in the LACP packet.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(13) According to the present disclosure, the first communication device and the second communication device each dynamically control link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). Each of the first communication device and the second communication device includes an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling link aggregation according to LACP, and a LACP packet transmitting/receiving unit that determines whether to enable a logical link based on the LACP packet. The minimum bandwidth control unit determines whether the number of physical links in a state in which LACP packets can be transmitted has reached the number of links corresponding to the minimum bandwidth of each communication device. The opposite device is notified using the Collecting flag and the Distributing flag included in the LACP packet.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(14) According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). the Aggregation flag is enabled in both the LACP packet transmitted from the communication device and the LACP packet received by the communication device; and after the Aggregation flag is enabled, the LACP packet transmitted from the communication device and Enabling a Synchronization flag in both LACP packets received by the communication device; and Collecting in both LACP packets transmitted from the communication device and LACP packets received by the communication device after the Synchronization flag is enabled. and enabling the flag and the Distributing flag.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

(15) According to the present disclosure, a communication device control method dynamically controls link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol). the step of enabling an aggregation flag in both the LACP packet transmitted from the communication device and the LACP packet received by the communication device; and enabling the Synchronization flag in both the LACP packets sent from the communication device and the LACP packets received by the communication device after the Collecting and Distribution flags are enabled. and an enabling step.

According to the above, in link aggregation, it is possible to match the valid states of logical links between devices that exchange LACP packets.

[Details of embodiments of the present disclosure]
Embodiments of the present disclosure will be described below with reference to the drawings. Identical or corresponding parts in the drawings are denoted by the same reference numerals and their description will not be repeated.

FIG. 1 is a block diagram schematically showing the configuration of a communication system including communication equipment according to an embodiment of the present disclosure. Referring to FIG. 1, communication system 10 includes two communication devices (own device 101 and opposing device 102). In one example, the own device 101 and the opposite device 102 are routers. The own device 101 and the opposite device 102 may be switches. The types of the own device 101 and the opposite device 102 are not limited as long as they are communication devices that can perform link aggregation.

The own device 101 and the opposite device 102 are connected through a plurality of physical links. In the example shown in FIG. 1, the own device 101 is connected to the opposite device 102 via physical links 20-1 to 20-3. Physical links 20-1 to 20-3 are bundled into one logical link 21 by link aggregation.

Own device 101 is connected to physical links 30-1, 30-2, and 30-3. Opposite device 102 is connected to physical links 40-1, 40-2, and 40-3. Physical links 30-1, 30-2, 30-3 may be connected to end devices, for example. Similarly, physical links 40-1, 40-2, 40-3 may also be connected to end devices.

FIG. 2 is a block diagram showing an example of the configuration of the communication device shown in FIG. The own device 101 and the opposite device 102 have the same configuration regarding link aggregation. Therefore, below, the configuration of the own device 101 will be representatively explained, and the description of the configuration of the opposite device 102 will not be repeated.

Referring to FIG. 2, self-device 101 has network side ports 111, 112, and 113, data communication control section 120, user side ports 131, 132, and 133, and LACP control section 140.

The number of network-side ports is not limited as long as link aggregation can be achieved using a plurality of network-side ports. In FIG. 2, three network side ports 111 to 113 are shown as an example. Network side ports 111, 112, and 113 accommodate physical links 20-1, 20-2, and 20-3, respectively. In this embodiment, network side ports 111-113 are bundled into logical link 110.

Similar to the network side ports, the number of user side ports is not limited. In FIG. 2, three user-side ports 131 to 133 are shown as an example. User-side ports 131, 132, and 133 accommodate physical links 30-1, 30-2, and 30-3, respectively.

The data communication control unit 120 controls data communication between the network side ports 111 to 113 and the user side ports 131 to 133.

The LACP control section 140 includes an LACP packet generation section 141, an LACP packet reception processing section 142, and a minimum bandwidth control section 143. The LACP packet generation section 141 and the LACP packet reception processing section 142 constitute an LACP packet transmission/reception section 145. The LACP control unit 140 can be realized by an integrated circuit that executes processing according to a program.

The LACP packet generation unit 141 generates LACP packets (that is, LACPDUs) for each network side port. The generated LACP packet is transmitted from the corresponding network side port among the network side ports 111 to 113 to the opposite device 102 through the physical link.

The LACP packet reception processing unit 142 receives LACP packets sent from the opposite device 102 to the network side ports 111 to 113 through each of the physical links 20-1, 20-2, and 20-3. Note that the LACP packet reception processing unit 142 may be a block that executes LACP protocol processing.

The minimum bandwidth control unit 143 controls the LACP packet generation unit 141 and the LACP packet reception processing unit 142 to perform minimum bandwidth control so that the state of the logical link between the own device 101 and the opposite device 102 is consistent. do.

FIG. 3 is a diagram showing an example of the structure of an LACP packet. Figure 3 shows the structure of LACPDU according to IEEE Std 802.1AX-2014. An actor corresponds to a device that transmits an LACP packet between the own device 101 and the opposite device 102. A partner corresponds to a device that receives LACP packets from an actor. In this embodiment, minimum bandwidth control is performed using the information stored in "Actor_State" in the LACPDU.

FIG. 4 is a diagram showing the structure of the item Actor_State in LACPDU. Figure 4 shows the configuration of Actor_State according to IEEE Std 802.1AX-2014. As shown in FIG. 4, Actor_State includes an LACP_Activity flag, an LACP_Timeout flag, an Aggregation flag, a Synchronization flag, a Collecting flag, a Distributing flag, a Defaulted flag, and an Expired flag. In this embodiment, in particular, the Aggregation flag, Synchronization flag, Collecting flag, and Distribution flag are used for minimum bandwidth control. Note that in the following description, the expressions "a flag is set" or "a flag is valid" mean setting a flag.

The Aggregation flag is encoded in bit 2. If the corresponding physical link is capable of aggregation, the Aggregation flag is set.

The Synchronization flag is encoded in bit 3. If the corresponding physical link is in a synchronized state (that is, if the physical link is assigned to a link aggregation group (LAG)), the Synchronization flag is set.

The Collecting flag is encoded in bit 4. If the LACPDU can be received by the corresponding physical link, the Collecting flag is set.

The Distributing flag is encoded in bit 5. If it is possible to send an LACPDU through the corresponding physical link, the Distributing flag is set.

Note that in the figures described below, the Aggregation flag and the Synchronization flag may be abbreviated as "Agg" and "Sync", respectively.

As mentioned above, the LACP min-links feature is an extension to the LACP protocol. The LACP min-links function detects when the number of physical links that are communicable (that is, in a state where LACP packets can be sent) among the physical links that make up the LAG is less than the set minimum number of links (that is, the minimum bandwidth). This function does not enable logical links in certain cases.

Since this function is not included in the standardization target, communication device vendors can decide on their own implementation specifications. The own device and the opposite device exchange LACP packets. However, LACP packets do not contain min-links information. For this reason, there is a possibility that the state of the logical link between the own device and the opposite device becomes inconsistent.

FIG. 5 is a diagram illustrating an example in which the logical link states between the own device and the opposing device may become inconsistent. In FIG. 5, "device A" and "device B" are routers, for example. Assume that device A is the own device 101 and device B is the opposite device 102.

If the own device 101 and the opposite device 102 are products from different vendors, the types of status information exchanged via LACP packets may be different. In the example shown in FIG. 5, when a certain physical link is communicable, the own device 101 enables the Aggregation (Agg) flag, the Collecting flag, and the Distribution flag in the LACP packet corresponding to that physical link. . When the physical link is communicable, the opposing device 102 enables the Aggregation flag and the Synchronization flag in the LACP packet corresponding to the physical link.

The own device 101 and the opposite device 102 enable logical links when the number of communicable physical links reaches the value of their own min-links. However, the value of min-links is different between the own device 101 and the opposite device 102. In this example, the value of min-links of the opposing device 102 is larger than the value of min-links of the own device 101.

In link aggregation between the own device 101 and the opposite device 102, when the number of physical links (ports) added to the logical link increases, the number of communicable physical links first reaches the min-links value of the own device 101. . The own device 101 enables the Synchronization flag in addition to the Aggregation (Agg) flag, the Collecting flag, and the Distribution flag. On the other hand, if a certain physical link is communicable, the opposing device 102 performs synchronization in the LACP packet corresponding to that physical link even if the number of communicable physical links is less than the min-links value of the opposing device 102. Enable flag.

The own device 101 and the opposite device 102 do not exchange minimum links information on LACP packets. In other words, the own device 101 and the opposite device 102 cannot recognize the setting value of the minimum links of the connection partner. Therefore, each of the own device 101 and the opposite device 102 determines the logical link only based on the state of its own physical link. If the number of communicable physical links (UP ports) is greater than or equal to the min-links value of the own device 101 and less than the min-links value of the opposing device 102, the own device 101 enables the logical link. . However, in the opposite device 102, the logical link is in an invalid state. If the number of minimum-links between connected devices differs in this way, there is a possibility that the states of logical links between the own device 101 and the opposing device 102 will not match.

According to the method disclosed in Patent Document 1, information on the number of physical links (ACTOR_CONFIG_NUM_ACTIVE_PORTS) in a communicable state is embedded in an LACP packet. Therefore, by using the information of ACTOR_CONFIG_NUM_ACTIVE_PORTS, the own device and the opposite device can grasp the status of each other's logical links. However, ACTOR_CONFIG_NUM_ACTIVE_PORTS information is newly defined information in the LACP packet. Therefore, both communication devices connected to each other must be able to understand ACTOR_CONFIG_NUM_ACTIVE_PORTS.

In this embodiment, the status of the communication device is indicated using existing parameters defined in the LACP packet. That is, in this embodiment, no new items are added to the LACP packet. However, the conditions for state transition are changed from the conditions described above (the conditions shown in FIG. 5). This makes it possible to avoid mismatching the states of logical links between communication devices. This embodiment will be described in detail below.

(Embodiment 1)
FIG. 6 is a sequence diagram for explaining minimum bandwidth control according to the first embodiment of the present disclosure. Generally, when a physical link is a member candidate for a logical link, it first enables the aggregation flag and notifies the other party that it is a member candidate. In this embodiment, the communication device uses the Aggregation flag as a flag to notify the other communication device whether the number of communicable physical links has reached its own min-links value. If the other party does not enable the Aggregation flag, it temporarily stops its own state transition and maintains that state until the other party enables the Aggregation flag. If the Aggregation flag is valid in the LACP packet from the other party, the Synchronization flag is valid in the LACP packet from itself, and the device transitions to the next state.

As shown in Figure 6, if the number of communicable physical links (Operational UP ports) is less than the min-links value of device A (own device 101), the data is not sent from device A to device B (opposite device 102). The flag is not valid (state without flag) in the LACP packet that is sent. The value of min-links of device B (opposite device 102) is greater than or equal to the value of min-links of device A (own device 101). Therefore, the LACP packet sent from the opposite device 102 to the own device 101 also has no flag.

If the number of communicable physical links is greater than or equal to the min-links value of device A (own device 101) and less than device B (opposite device 102), device A sets the Aggregation flag in the LACP packet sent from itself. To enable. On the other hand, the LACP packet sent from the opposite device 102 has no flag. Therefore, in this case, device A temporarily stops its own state transition. Device A maintains its own state until the Aggregation flag becomes valid in the LACP packet from device B.

Device B (opposite device 102) checks the LACP packet from device A (own device 101). When the number of communicable physical links exceeds the min-links value of device B (opposite device 102) and the number of physical links with valid aggregation flags exceeds the min-links value of device B, the opposing device 102 enables the Aggregation flag and the Synchronization flag.

The number of communicable physical links exceeds the min-links value of device A (own device 101). Device A checks the LACP packet from device B. The number of physical links with valid Aggregation flags exceeds the value of min-links of device A, and the number of physical links with valid Synchronization flags exceeds the value of min-links of device A. In response, device A enables the Collecting flag and the Distributing flag in the LACP packet sent from device A.

Further, the number of communicable physical links exceeds the min-links value of device B (opposite device 102). Device B checks the LACP packet from device A. The number of physical links with valid Aggregation flags exceeds the value of min-links of device B, and the number of physical links with valid synchronization flags exceeds the value of min-links of device B. In response, device B enables the Collecting flag and the Distributing flag in the LACP packet sent from device B.

FIG. 7 is a flowchart for explaining the flow of the control process shown in FIG. 6. The processing shown in this flowchart is executed by the minimum bandwidth control unit 143 of the own device 101 and the opposite device 102, for example, when starting up the communication system. Since both the own device 101 and the opposite device 102 execute the same processing, the own device 101 and the opposite device 102 are collectively referred to as "communication devices."

As shown in FIG. 7, the aggregation flag is not set at the beginning of control. In step S11, the communication device determines whether the number of communicable physical links (“Oper UP links”) has reached its own min-link value. If the number of Oper UP links has not reached the value of its own min-link (NO in step S11), the determination process in step S11 is repeated.

As the number of physical links added to the logical link increases, the number of communicable physical links reaches the min-link value. In this case (YES in step S11), the process proceeds to step S12. In step S12, the communication device sets the aggregation flag of the LACP packet transmitted from itself.

In step S13, the communication device checks the LACP packet received from the other party. The communication device determines whether the number of physical links for which the other party has set the aggregation flag has reached the number of its own min-links. "The number of physical links for which the other party has set the aggregation flag" is the number of LACP packets for which the aggregation flag is valid. If the number of LACP packets with valid aggregation flags has not reached the number of its own min-links (NO in step S13), the process of step S13 is repeated. If the number of LACP packets with valid aggregation flags reaches the number of its own min-links (YES in step S13), the process proceeds to step S14. In step S14, the communication device sets a Synchronization flag in the LACP packet it sends.

In step S15, the communication device checks the LACP packet received from the other party. The communication device determines whether the number of physical links on which the other party has set the synchronization flag has reached the number of its own min-links. "The number of physical links for which the other party has set the Synchronization flag" is the number of LACP packets for which the Synchronization flag is valid. If the number of LACP packets with valid synchronization flags has not reached the number of its own min-links (NO in step S15), the process of step S15 is repeated. If the number of LACP packets with valid synchronization flags reaches the number of its own min-links (YES in step S15), the process proceeds to step S16.

In step S16, the communication device sets a Collecting flag and a Distributing flag in the LACP packet sent from itself, and adds the physical link to the valid members (communicable members) of the logical link.

FIG. 8 is a flowchart showing an example of minimum bandwidth control executed while a logical link is valid. As shown in Figure 8, while the logical link is valid, the communication device checks the LACP packets received from the other party and determines whether the number of links for which the other party has set the Aggregation flag and Synchronization flag is its own min-link number. It is determined whether it has reached (step S21). If the number of links with the Aggregation flag and the Synchronization flag set has reached the value of its own min-links (YES in step S21), the process returns to S21. That is, the logical link remains valid. On the other hand, if the number of links for which the other party has set the Aggregation flag and the Synchronization flag has not reached the value of its own min-links (NO in step S21), the process moves to step S22.

In step S22, the communication device resets the Aggregation flag, Synchronization flag, Collecting flag, and Distribution flag in its own LACP packet to invalidate the logical link. Then, the logical link is constructed again according to the flow shown in FIG.

According to the first embodiment, communication devices connected to each other do not need to know each other's minimum number of links. By checking the flag of the LACP packet sent from the other party, the communication device can determine whether the number of physical links has reached the minimum number of links of the other party. Even if different min-links numbers are set between communication devices, the logical link will not become valid until the larger of the two min-links numbers is satisfied. Therefore, it is possible to avoid an inconsistent state in which a logical link is enabled in one of the two communication devices and disabled in the other. That is, it is possible to match the states of logical links between two communication devices.

(Embodiment 2)
In the second embodiment, the aggregation flag is used to indicate that the corresponding physical link is capable of aggregation, that is, that it is a link that can be a candidate for link aggregation.

FIG. 9 is a sequence diagram for explaining minimum bandwidth control according to the second embodiment of the present disclosure. The number of communicable physical links (Operational UP ports) is smaller than both the min-links value of device A (own device 101) and the min-links value of device B (opposite device 102). In this case, the Aggregation flag is valid in both the LACP packet sent from device A to device B and the LACP packet sent from device B to device A.

Next, if the number of communicable physical links is greater than or equal to the min-links value of device A (own device 101) and less than the min-links value of device B (opposite device 102), device A In the LACP packet sent from device A to device B, enable the Collecting flag and the Distributing flag. On the other hand, in the LACP packet sent from device B to device A, the Aggregation flag is valid, but the Collecting flag and the Distribution flag are invalid.

Next, the number of communicable physical links exceeds both the min-links value of device A and the min-links value of device B. Device B enables the Collecting flag and the Distributing flag in the LACP packet sent from itself.

Furthermore, device B checks the LACP packet sent from device A. If the number of links for which the Collecting flag and the Distributing flag are enabled is greater than or equal to the number of min-links of device B, device B enables the Synchronization flag in the LACP packet sent from device B.

Similarly, device A checks LACP packets sent from device B. If the number of links for which the Collecting flag and the Distributing flag are enabled is greater than or equal to the number of min-links of device A, device A enables the Synchronization flag in the LACP packet sent from device A.

FIG. 10 is a flowchart for explaining the flow of the control process shown in FIG. The processing shown in this flowchart is executed by the minimum bandwidth control unit 143 of the own device 101 and the opposite device 102, for example, when starting up the communication system. Similar to the explanation of FIG. 7, since both the own device 101 and the opposite device 102 execute the same process, the own device 101 and the opposite device 102 are collectively referred to as a "communication device."

The Aggregation flag is valid at the start of control. In step S31, the communication device determines whether the number of communicable physical links (“Oper UP links”) has reached its own min-link value. If the number of Oper UP links has not reached the value of its own min-link (NO in step S31), the determination process in step S31 is repeated.

As the number of physical links added to the logical link increases, the number of communicable physical links reaches the min-link value. In this case (YES in step S31), the process proceeds to step S32. In step S32, the communication device sets the Collecting flag and Distribution flag of the LACP packet transmitted from itself.

In step S33, the communication device checks the LACP packet received from the other party. The communication device determines whether the number of physical links on which the other party has set both the Collecting flag and the Distributing flag has reached the number of its own min-links. "The number of physical links on which the other party has set both the Collecting flag and the Distributing flag" is the number of LACP packets for which both the Collecting flag and the Distributing flag are valid. If the number of LACP packets for which both the Collecting flag and the Distributing flag are valid has not reached the number of its own min-links (NO in step S33), the process of step S33 is repeated. If the number of LACP packets for which both the Collecting flag and the Distributing flag are valid reaches the number of its own min-links (YES in step S33), the process proceeds to step S34. In step S34, the communication device sets a Synchronization flag in the LACP packet it sends.

In step S35, the communication device checks the LACP packet received from the other party. The communication device 101 checks the LACP received from the opposite device 102 and determines whether the number of physical links for which the other party has set the synchronization flag has reached the number of its own min-links. "The number of physical links for which the other party has set the Synchronization flag" is the number of LACP packets for which the Synchronization flag is valid. If the number of LACP packets with valid synchronization flags has not reached the number of its own min-links (NO in step S35), the process of step S35 is repeated.

If the number of LACP packets with valid synchronization flags reaches the number of its own min-links (YES in step S35), the process proceeds to step S36. In step S36, the physical link is added to the valid members (communicable members) of the logical link.

FIG. 11 is a flowchart illustrating an example of minimum bandwidth control executed while a logical link is valid in Embodiment 2 of the present disclosure. The processing flow shown in FIG. 11 is basically the same as the flow shown in FIG. 8. While the logical link is valid, the communication device checks the LACP packets received from the other party and determines whether the number of links on which the other party has set the Synchronization flag, Collecting flag, and Distribution flag has reached its own min-link number. It is determined whether or not (step S41). If the number of links with the Synchronization flag, Collecting flag, and Distribution flag set has reached its own min-link number (YES in step S41), the process returns to S41. That is, the logical link remains valid. On the other hand, if the number of links for which the other party has set the Synchronization flag, Collecting flag, and Distribution flag has not reached the value of its own min-links (NO in step S41), the process moves to step S42.

In step S42, the communication device resets the Aggregation flag, Synchronization flag, Collecting flag, and Distribution flag in its own LACP packet to invalidate the logical link. Then, the logical link is constructed again according to the flow shown in FIG.

In the second embodiment as well, communication devices connected to each other can know whether the number of links has reached the minimum number of links of the other party, even if they do not know each other's minimum number of links. Furthermore, even if different numbers of min-links are set between communication devices, even if different min-links are set between devices, the larger value of the two numbers of min-links will always be adopted. Ru. Therefore, it is possible to avoid an inconsistency where one device has a logical link in a valid state and the other device has a logical link in an invalid state.

(Embodiment 3)
The minimum bandwidth control according to the first embodiment and the minimum bandwidth control according to the second embodiment may be combined. The minimum bandwidth control unit 143 of each of the own device 101 and the opposite device 102 determines whether the number of physical links that are ready to transmit LACP packets has reached the number of links corresponding to the minimum bandwidth of the communication device. has a first mode and a second mode for notifying. In the first mode, the processes of steps S11 to S16 (see FIG. 8) are executed. In the second mode, the processes of steps S31 to S36 (see FIG. 10) are executed. The minimum bandwidth control unit 143 selects a mode from the first mode and the second mode, and executes processing for minimum bandwidth control according to the selected mode.

FIG. 12 is a flowchart illustrating an example of minimum bandwidth control according to Embodiment 3 of the present disclosure. For example, after starting, the lowest bandwidth control unit 143 selects the first mode. As a result, the process of step S100 is executed. In step S100, the processes of steps S11 to S16 (see FIG. 8) are executed. If the process progresses normally to step S16, the minimum bandwidth control ends normally. However, if a timeout occurs in the processing of any of steps S11 to S16, the processing may transition to step S200. In this case, the minimum bandwidth control unit 143 executes processing for minimum bandwidth control according to the second mode.

In step S200, the processes of steps S31 to S36 (see FIG. 10) are executed. If the process progresses normally to step S36, the minimum bandwidth control ends normally. However, if a timeout occurs in the processing of any of steps S31 to S36, the processing may transition to step S100. Further, although the processing is started from step S100, the processing may be started from step S200.

As described above, according to the third embodiment, since the communication device has two modes for minimum bandwidth control, more flexible control depending on the connection partner is possible.

According to each of the embodiments described above, the meanings of flags in LACP packets are expanded from existing definitions. This eliminates the need to define new parameters in the LACP packet, and allows information to be exchanged between itself and the other party as to whether the minimum bandwidth (minimum links) is satisfied. Furthermore, in this embodiment, by defining the processing logic based on the flag of the LACP packet, it is possible to create an inconsistency in which one of the connected devices has a logical link in a valid state and the other has a logical link in an invalid state. situation can be avoided.

Furthermore, according to each of the above-described embodiments, a device that does not have a minimum links function (if it does not have a minimum links function, it operates substantially the same as minimum links = 1) and a device that has a minimum links function. can be connected. Logical links are not enabled between connected devices until the larger minimum links value is met. Therefore, even when a device without a minimum links function and a device with a minimum links function are connected, the minimum links function can be provided. Furthermore, even if minimum links are set on only one of two devices, the minimum links function can be provided. Thereby, when the operator sets up the equipment, the operator's operation steps can be reduced.

The embodiments disclosed herein are illustrative in all respects and should be considered not to be restrictive. The scope of the present invention is indicated by the claims rather than the embodiments described above, and it is intended that equivalent meanings to the claims and all changes within the scope are included.

10 Communication system 20-1, 20-2, 20-3, 30-1, 30-2, 30-3, 40-1, 40-2, 40-3 Physical link 21, 110 Logical link 101 Own device 102 Opposite Devices 111, 112, 113 Network side port 120 Data communication control section 131, 132, 133 User side port 140 LACP control section 141 Packet generation section 142 Packet reception processing section 143 Minimum bandwidth control section 145 Packet transmission/reception section S11 to S16, S21, S22, S31 to S36, S41, S42, S100, S200 steps

Claims (15)

A communication device that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol),
an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling the link aggregation according to the LACP;
a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet,
The minimum bandwidth control unit determines whether the number of physical links in a state in which the LACP packet can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device, based on an Aggregation flag included in the LACP packet. A communication device that notifies the opposite device by. The minimum bandwidth control unit receives the LACP packet from the opposite device, and determines the number of physical links on which the opposite device is in a state in which the LACP packet can be transmitted, based on the Aggregation flag included in the received LACP packet. The communication device according to claim 1, wherein when it is determined that the number of links has reached the number of links corresponding to the minimum bandwidth of the communication device, a synchronization flag is enabled in the LACP packet from the communication device. A communication device that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol),
an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling the link aggregation according to the LACP;
a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet,
The minimum bandwidth control unit determines whether the number of physical links in a state in which the LACP packet can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device, based on a Collecting flag included in the LACP packet. A communication device that notifies the opposite device using the Distributing flag. The minimum bandwidth control unit receives the LACP packet from the opposite device, and is in a state where the opposite device can transmit the LACP packet according to the Collecting flag and the Distributing flag included in the received LACP packet. According to claim 3, when it is determined that the number of physical links has reached the number of links corresponding to the minimum bandwidth of the communication device, a synchronization flag is enabled in the LACP packet from the communication device. communication equipment. The minimum bandwidth control unit receives the LACP packet from the opposite device, and determines, based on the Synchronization flag included in the received LACP packet, a physical link in which the opposite device is in a state in which the LACP packet can be transmitted. The communication method according to claim 2 or 4 , wherein when it is determined that the number of links has reached the number of links corresponding to the minimum bandwidth of the communication device, the physical link is added to the valid members of the logical link. Device. The minimum bandwidth control unit may be arranged such that, in a valid state of the logical link, the number of physical links in which both the Aggregation flag and the Synchronization flag are valid in the LACP packet from the opposite device is equal to the minimum bandwidth of the communication device. 3. The communication device according to claim 2 , wherein if it is determined that the number of links is less than the number of links corresponding to , the communication device disables the logical link and reconstructs the logical link. The minimum bandwidth control unit receives the LACP packet sent from the opposite device, and determines the number of physical links associated with the Synchronization flag, the Collecting flag, and the Distributing flag included in the received LACP packet. 5. The communication device according to claim 4 , wherein when it is determined that the number of links is less than the number of links corresponding to the lowest bandwidth of the communication device, the communication device disables the logical link and reconstructs the logical link. A communication device that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol),
an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling the link aggregation according to the LACP;
a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet,
The minimum bandwidth control unit includes a first controller for notifying the opposing device whether the number of physical links in a state in which the LACP packet can be transmitted has reached the number of links corresponding to the minimum bandwidth of the communication device. mode and a second mode,
The first mode is based on the Aggregation flag included in the LACP packet.
A mode in which the opposing device is notified that the number of physical links in the transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device,
In the second mode, the number of physical links in the transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device, according to a Collecting flag and a Distributing flag included in the LACP packet. The communication device is in a mode of notifying the opposing device of the above. A communication device control method that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising:
determining whether the number of physical links that are ready to transmit LACP packets for controlling the link aggregation according to the LACP has reached the number of links corresponding to the minimum bandwidth of the communication device;
the step of validating an aggregation flag included in the LACP packet when the number of physical links in the transmittable state reaches the number of links corresponding to the minimum bandwidth of the communication device. How to control the device. A communication device control method that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising:
determining whether the number of physical links that are ready to transmit LACP packets for controlling the link aggregation according to the LACP has reached the number of links corresponding to the minimum bandwidth of the communication device;
the step of validating a Collecting flag and a Distributing flag included in the LACP packet when the number of physical links in the transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device; A method for controlling a communication device. A communication device control method that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising:
selecting one of the first mode and the second mode;
Notify that the number of physical links that are ready to transmit LACP packets for controlling the link aggregation according to the LACP according to the selected mode has reached the number of links corresponding to the minimum bandwidth of the communication device. Equipped with a step,
In the first mode, an Aggregation flag included in the LACP packet indicates that the number of physical links in the transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device. This is the mode to notify the destination device.
In the second mode, the number of physical links in the transmittable state has reached the number of links corresponding to the minimum bandwidth of the communication device, according to a Collecting flag and a Distributing flag included in the LACP packet. A method for controlling a communication device, the mode being a mode for notifying the opposing device of the above. A first communication device and a second communication device each dynamically controlling link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol),
Each of the first communication device and the second communication device,
an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling the link aggregation according to the LACP;
a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet,
The minimum bandwidth control unit of one of the first communication device and the second communication device is configured such that the number of physical links in a state capable of transmitting the LACP packet corresponds to the minimum bandwidth of each communication device. A communication system that notifies the opposite device , which is the other one of the first communication device and the second communication device, of whether or not the number of links has reached the maximum number of links. A first communication device and a second communication device each dynamically controlling link aggregation that bundles a plurality of physical links into one logical link according to LACP (Link Aggregation Control Protocol),
Each of the first communication device and the second communication device,
an LACP packet transmitting/receiving unit that transmits and receives LACP packets for controlling the link aggregation according to the LACP;
a minimum bandwidth control unit that determines the validity of the logical link based on the LACP packet,
The minimum bandwidth control unit of one of the first communication device and the second communication device is configured such that the number of physical links in a state capable of transmitting the LACP packet corresponds to the minimum bandwidth of each communication device. communication, in which the opposing device , which is the other one of the first communication device and the second communication device, is notified of whether or not the number of links has reached the maximum number of links. system. A communication device control method that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising:
enabling an Aggregation flag in an LACP packet transmitted from the communication device to the opposite device ;
The Aggregation flag is valid in the LACP packet received by the communication device from the opposite device, thereby validating the Synchronization flag in the LACP packet transmitted from the communication device;
Since the Synchronization flag is enabled in the LACP packet received by the communication device from the opposite device after the step of enabling the Synchronization flag, the Collecting flag and the Distributing flag are set in the LACP packet transmitted from the communication device . A method for controlling a communication device, comprising: enabling a communication device. A communication device control method that dynamically controls link aggregation that bundles multiple physical links into one logical link according to LACP (Link Aggregation Control Protocol), the method comprising:
enabling an Aggregation flag in the L ACP packet transmitted from the communication device to the opposite device ;
The Aggregation flag is valid in the LACP packet received by the communication device from the opposite device, so that a Collecting flag and a Distribution flag are enabled in the LACP packet transmitted from the communication device;
Since the Collecting flag and the Distributing flag are valid in the LACP packet received by the communication device from the opposite device after the step of validating the Collecting flag and the Distributing flag, the Collecting flag and the Distributing flag are enabled in the LACP packet transmitted from the communication device . A method for controlling a communication device, comprising: enabling a Synchronization flag in a communication device.

Images