JP5201588B2 - Bandwidth control device - Google Patents

Description

The present invention provides a bandwidth control of a plurality of line card interface relates to the bandwidth control equipment for performing load balancing bandwidth management capabilities.

  Conventionally, it is composed of a plurality of line cards (I / O cards that provide an interface for connecting to a WAN or LAN) interface (hereinafter referred to as a blade), and a bandwidth control function (QoS: Quality of Service) for each user flow In a layer 2 switch device and a router that owns a network, a point for performing bandwidth control is on a blade regardless of input, and a service for performing bandwidth control across a plurality of blades is known. When providing such a service, the total bandwidth allocated to the bandwidth control unit of each blade is the bandwidth set by the user, and the set bandwidth must be shared on multiple blades and divided (distributed) to multiple blades. is there.

  With reference to FIG. 3, the configuration of a conventional bandwidth control apparatus will be described. The input blade 7 includes a queue monitoring unit 71 and a bandwidth control unit 72. The queue monitoring unit 71 notifies the bandwidth management unit 9 of the bandwidth usage status for each user QoS. The bandwidth management unit 9 performs bandwidth distribution to the bandwidth control unit 72 of the input blade 7 based on the information on the usage status of the bandwidth notified from the queue monitoring unit 71. The band controller 72 outputs data to the output blade 8 using the distributed band. One bandwidth management unit is arranged in a specific unit in the device, such as a device control unit for controlling the entire device, and one bandwidth management unit performs bandwidth distribution processing for all queues. Is generally (see, for example, Patent Document 1).

JP 2007-13479A

  By the way, in the prior art, information on bandwidth management is concentrated on the management unit, so the load on the bandwidth management unit becomes very large. These loads are caused by discarding of notification information due to congestion of the internal bus between the control unit and the blade, processing delay due to congestion of the CPU of the management unit, and the reflection of the bandwidth from the bandwidth management unit to the bandwidth control unit, As a result, there is a problem that appropriate bandwidth control cannot be performed.

  In addition, when the application of complex traffic, which is a load on the bandwidth management unit, is concentrated on a specific blade, it affects not only the bandwidth allocation to that blade but also the allocation to other blades. End up. In order to avoid the influence of such load as much as possible, measures such as mounting a high-performance CPU (control unit) in the management unit and increasing the processing capability are taken. However, the load is the device scale (number of blades and QoS). ) Will increase with the number of implementations, so that there will eventually be a problem that the device scale cannot be increased.

  In addition, the range of influence when a failure occurs in the management unit affects the traffic of all blades. This is because, in the case where the management unit is non-redundant, the bandwidth distribution function stops as it is, and thereafter, the bandwidth control does not function normally. Even if it is redundant, it is very difficult to always synchronize all QoS information, and it is very difficult for a new management unit to take over the state instantaneously. There is also a problem that it becomes impossible to distribute.

The present invention has been made in view of such circumstances, and an object thereof is to provide a bandwidth control equipment capable of performing load balancing bandwidth management capabilities.

The present invention relates to a bandwidth control device that controls a bandwidth to be used in a communication device including a plurality of input blades and a plurality of output blades, and is a queue monitoring unit that is disposed on the input blade and monitors a queue. And a bandwidth control means for controlling a bandwidth to be used, which is arranged on the input blade, and only information on bandwidth usage status for each user flow of data input to the input blade is received from the queue monitoring means , and the bandwidth usage is received. Band management means for distributing bandwidth to the bandwidth control means arranged on the same input blade as the queue monitoring means based on status information, and the bandwidth management means for each user flow The load of the band management means is distributed by being arranged for each output blade in which an output line exists.

The present invention is the band control device described above, wherein one input blade is connected to a plurality of output blades, and an output destination of link aggregation extends over the plurality of output blades. Storage means for storing information indicating which output blade of the plurality of output blades to be a representative blade in link aggregation is arranged, and the queue monitoring means is arranged in the input blade in which it is arranged The bandwidth usage status information is output to the bandwidth management means arranged in the representative blade represented by the information stored in the storage means.
Further, the present invention is the above-described band control device, wherein when a failure occurrence is detected in the representative blade, the information representing the representative blade stored in the storage means is updated to another output blade. The queue monitoring unit further includes a control unit, and when the information of the storage unit is updated by the device control unit, the queue monitoring unit is configured to notify the band management unit arranged in the representative blade after the update. The bandwidth management unit of the output blade that has output information and has become a representative blade starts the bandwidth distribution based on the bandwidth usage information received from the queue monitoring unit.

  According to the present invention, since the bandwidth management unit is distributed to each output blade, it is possible to avoid the processing load from being concentrated on a specific blade or unit, and the processing load on one bandwidth management unit is reduced. There is no congestion of the internal bus and CPU of each part, and it becomes possible to perform appropriate bandwidth control. Further, the QoS that is affected even when a failure occurs in the blade can be limited to the QoS that is the output destination of the blade. Further, even if the device scale increases and the number of blades and QoS increases, the load on the bandwidth management unit does not increase and the device can be scaled up.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a figure which shows operation | movement of the apparatus shown in FIG. It is a block diagram which shows the structure of the apparatus which performs the band control by a prior art.

  Hereinafter, a band control device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes an input blade, which includes two systems of queue monitoring units 11 and 14, bandwidth control units 12 and 15, and a LAG (link aggregation) management map storage unit 13. Reference numeral 2 denotes an input blade, which includes a queue monitoring unit 21 and a bandwidth control unit 22 of one system, and a LAG management map storage unit 23. Reference numeral 3 denotes an output blade, which includes a band management unit 31. Reference numeral 4 denotes an output blade, which includes a band management unit 41. The bandwidth management unit 31 receives a notification of the bandwidth usage status for each user QoS from the queue monitoring unit 11 and distributes the bandwidth to the bandwidth control unit 12. The bandwidth management unit 41 receives notification of the bandwidth usage status from the queue monitoring unit 14 in units of user QoS, distributes the bandwidth to the bandwidth control unit 15, and distributes the bandwidth from the queue monitoring unit 21 to the user QoS units. Upon receiving the usage status notification, the bandwidth is distributed to the bandwidth control unit 22. As shown in FIG. 1, the bandwidth management units 31 and 41 are arranged in the corresponding QoS output blades 3 and 4, respectively. For example, even if the input blades are the same, QoS bandwidth management units with different output blades are arranged on different output blades (QoS # 1 and QoS # 2).

  When a redundant configuration using LAG is adopted, it is necessary to perform bandwidth management for each LAG as an output destination, while the output destination of LAG may straddle a plurality of blades. In the present invention, when the output destination of the LAG extends over a plurality of blades, a representative blade that performs LAG bandwidth management is determined, and the representative blade is controlled in common between the input blades. When the QoS belongs to LAG management, each queue monitoring unit 11, 14, 21 obtains the representative blade of this LAG from the LAG management map stored in the LAG management map storage unit 13, 23, and represents the representative blade The upper bandwidth management unit is notified of the queue status. On the other hand, if it does not belong to the LAG, the queue status is notified to the bandwidth management unit of the output blade. Each of the bandwidth management units 31 and 41 collects notification information of all the input blades, and allocates a bandwidth to the bandwidth control unit of each blade based on this information. Each of the bandwidth control units 12, 15, and 22 transmits a data packet using the bandwidth allocated from the bandwidth management unit 31 or the bandwidth management unit 41. This operation is performed on a QoS basis.

  In this way, since the bandwidth management processing is distributed by the two bandwidth management units 31 and 41, even if the processing load on the output blade 4 increases and the operation of the bandwidth management unit 41 becomes slow, the output blade The bandwidth control unit 12 (QoS # 1) having 3 as the output destination can continue the bandwidth distribution operation without being affected by the bandwidth control unit 12 (QoS # 1). Even if the output blade 4 fails, the bandwidth control unit 12 (QoS # 1) that uses the output blade 3 as an output destination can continue the bandwidth distribution operation without being affected.

  Next, with reference to FIG. 2, the operation when the representative blade fails in the LAG configuration will be described. In FIG. 2, it is assumed that the ports belonging to LAG # 1 are in the output blades 4 and 5. When a failure occurs in the output blade 4 while the representative blade of the LAG # 1 is the output blade 4, the device control unit 6 stores the LAG management map of the input blade 2 when the failure of the output blade 4 is detected. The information of the output blade associated with LAG # 1 of the LAG management map stored in the unit 23 is updated. In the example shown in FIG. 2, the identification information (# 1) of the output blade 4 associated with LAG # 1 is changed to the identification information (# 2) of the output blade 5.

  The QoS queue monitoring unit 21 belonging to the LAG whose LAG management map has been updated immediately notifies the current queue state to the bandwidth management unit (here, the bandwidth management unit 51) of the new representative blade. The bandwidth control unit 51 of the new representative blade collects the queue status information of each input blade and starts bandwidth distribution. In this operation, there is no influence on the QoS in which the bandwidth management unit 51 is originally arranged in the output blade 5.

  As described above, the bandwidth management unit that collects the queue status information and distributes the bandwidth does not concentrate on a specific unit or blade. Since the bandwidth management units are distributed and arranged, it is possible to avoid an increase in processing load on the bandwidth management unit. When the bandwidth control unit exists on the input blade, the bandwidth control unit and the bandwidth management unit are separate blades. When the bandwidth control unit exists on the output blade, the bandwidth control unit and the bandwidth management unit are the same blade, and the device Since this configuration is inherited regardless of the scale and the number of blades, the bandwidth management unit on each blade may manage only the QoS to which the own blade is the output destination regardless of the position of the bandwidth control unit and the number of blades.

  Further, in this embodiment, the input blade and the output blade are described as separate blades. However, even when the input blade and the output blade are configured by one input / output blade, by applying the present invention, the bandwidth on each blade is set. Since the management unit only needs to manage the QoS for which the own blade is the output destination, the same effect can be obtained.

  In addition, when there are a plurality of output ports such as LAG (Link Aggregation) and the ports span a plurality of blades, one of the blades to which the ports constituting the LAG belong is designated as a representative blade. Since only the bandwidth management unit on the representative blade is operated, the bandwidth control unit can be assigned to multiple blades by storing on each LAG the blades that have a common bandwidth management unit for all blades. Even when straddling, the queue monitoring unit can transmit a notification to the bandwidth management unit on one blade.

  Note that a program for realizing the functions of the processing units shown in FIGS. 1 and 2 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. The bandwidth control management process may be performed by Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  1, 2, ... Input blade, 11, 21 ... Queue monitoring unit, 12, 15, 22 ... Band control unit, 13, 23 ... LAG management map storage unit 3, 4, 5, ... Output blades 31, 41, 51 ... band management unit, 6 ... device control unit

Claims (3)

In a communication device composed of a plurality of input blades and a plurality of output blades , a bandwidth control device that controls a bandwidth to be used,
A queue monitoring means disposed on the input blade for monitoring the queue;
Band control means arranged on the input blade for controlling the band to be used;
Only the bandwidth usage information for each user flow of the data input to the input blade is received from the queue monitoring means , and based on the bandwidth usage information, the information is arranged on the same input blade as the queue monitoring means. and a band management means for performing bandwidth allocation with respect to said band control means,
The bandwidth control device according to claim 1, wherein the bandwidth management means distributes the load of the bandwidth management means by being arranged for each of the output blades in which an output line for each user flow exists. One input blade is connected to a plurality of output blades, and an output destination of link aggregation straddles the plurality of output blades,
  The input blade is provided with storage means for storing information indicating which output blade is the representative blade of the plurality of output blades in link aggregation.
  The queue monitoring unit sends the band usage status information to the band management unit arranged in the representative blade represented by the information stored in the storage unit arranged in the input blade in which the queue monitoring unit is arranged. The band control device according to claim 1, which outputs the bandwidth control device.   When a failure occurrence is detected in the representative blade, the apparatus further comprises device control means for updating information representing the representative blade stored in the storage means to another output blade,
  When the information of the storage unit is updated by the device control unit, the queue monitoring unit outputs the band usage status information to the band management unit arranged in the updated representative blade,
  3. The bandwidth control apparatus according to claim 2, wherein the bandwidth management unit of the output blade that has newly become a representative blade starts the bandwidth distribution based on the bandwidth usage status information received from the queue monitoring unit.

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