JP6112556B2 - Packet relay device and discarded packet information collection system - Google Patents

Description

  The present invention relates to a packet relay device and a discard packet information collection system, and more particularly to a packet relay device and a discard device that enable analysis of a packet lost due to a discard search such as a route search result or an internal failure in the packet relay device. The present invention relates to a packet information collection system.

  As a conventional packet relay apparatus, there is a packet relay apparatus having a function of monitoring a packet by mirroring a port transmitted from the packet relay apparatus as disclosed in Japanese Patent Application Laid-Open No. 2004-207962 (Patent Document 1).

JP 2004-207962 A

  In the packet relay apparatus as described above, it is impossible to monitor a packet discarded in the packet relay apparatus, and detailed information of a packet lost packet is not known. Therefore, when a packet loss occurs in the packet relay device, it may take a lot of time to identify the cause.

As described above, in the prior art, even if the transmission port can be mirrored, the packet determined to be discarded (the packet that is not transmitted) in the packet relay device cannot be monitored. I didn't know what it was.
In order to solve the above-described problems, an object of the present invention is to provide a packet relay apparatus that outputs information for analyzing detailed factors of packets discarded in the packet relay apparatus or the analyzed information.

In order to solve the above problems, according to one aspect of the present invention,
A memory having a first queue that holds packet information about the packet to output the packet to a destination, and a second queue that holds packet information for processing by the processor;
Relay that determines whether to relay or discard a packet, and distributes packet information to the first queue when the packet is relayed, or to the second queue when the packet is discarded, according to the determination result A packet relay apparatus including a processing unit is provided.

According to another aspect,
A packet relay device;
A discard factor display device for displaying a discard factor of a packet discarded by the packet relay device;
The packet relay device is:
A memory having a first queue that holds packet information about the packet to output the packet to a destination, and a second queue that holds packet information for processing by the processor;
Determine whether to relay or discard the packet, and distribute packet information to the first queue when relaying the packet according to the determination result, and packet information with discard factor information added when discarding the packet A relay processing unit for distributing to the second queue,
The processor is provided with a discard packet information collection system for displaying a discard factor based on packet information on the discard factor display device.

  ADVANTAGE OF THE INVENTION According to this invention, the packet relay apparatus which outputs the information for analyzing the detailed factor of the packet discarded within the packet relay apparatus, or the analyzed information can be provided.

The block diagram of a packet relay apparatus. The logical block diagram of a packet transfer control part and its periphery block. Port transmission queue format example. Example of discard transmission queue format. Explanatory drawing of the specific Example which adds a discard factor to a packet. Sample configuration screen for filtering and sampling. The example of a display screen which a processor outputs to an external display device.

FIG. 1 shows a configuration diagram of the packet relay apparatus.
The packet relay apparatus 100 includes a crossbar switch 101, a packet transfer control unit 102, a packet storage memory 103, a reception queue information storage memory 104, a transmission queue information storage memory 114, a search control unit 105, a port 108, 109 and a processor 110.
Packet relay apparatuses 111 and 112 are apparatuses connected to the packet relay apparatus 100. The packet relay apparatuses 111 and 112 may have the same configuration as the packet relay apparatus 100, for example, or may be an appropriate packet relay apparatus. In addition to the packet relay apparatuses 111 and 112, an appropriate communication apparatus may be connected.

The external display device 113 is a device that is connected to the processor 110 and displays detailed information of packets discarded from the processor 110 that has received a packet determined to be discarded by the packet transfer control unit 102. For example, information such as a discard factor, a discard location, the number of discarded packets, a destination and a transmission source of the discarded packets, and the like can be displayed.
The packet relay device 100 and the external display device (discard factor display device) 113 constitute a discard packet information collection system.
The crossbar switch 101 of the packet relay apparatus 100 has a function of transferring packets between a plurality of packet transfer control units 102 in the packet relay apparatus 100.
The packet transfer control unit 102 includes functions of a reception queue control unit 106 and a transmission queue control unit 107, for example. Packet data received from the crossbar switch 101 is passed to the reception queue control unit 106. The packet transfer control unit 102 includes a filter control unit and a sampling control unit which will be described later.

  The reception queue control unit 106 stores the received packet data in the packet storage memory 103, and stores reception queue information that is a packet data analysis result in the reception queue information storage memory 104. Thereafter, the reception queue information stored in the reception queue information storage memory 104 is passed to the search control unit 105. The search control unit 105 determines whether relaying is necessary based on the received reception queue information, and passes the result to the transmission queue control unit 107. The search control unit 105 also passes the route information obtained by executing the route search to the transmission queue control unit 107, and also passes the discard factor information to the transmission queue control unit 107 when it is determined that the packet is to be discarded.

  The transmission queue control unit 107 temporarily stores the output result (packet information) from the search control unit 105 in the transmission queue information storage memory 114 based on the determination result of the search control unit 105. Thereafter, the transmission queue control unit 107 reads the packet information and the packet data for the packets determined to be relayed from the transmission queue information storage memory 114 and the packet storage memory 103, respectively, and sets the appropriate port 108 according to the path information. To 109. On the other hand, for a packet that is determined not to be relayed, the transmission queue control unit 107 reads the packet information and the packet data from the transmission queue information storage memory 114 and the packet storage memory 103 and outputs them to the processor 110.

The processor 110 has a function of collecting and analyzing information on discarded packets and transferring discard information to be displayed on the external display device 113.
The reception queue information storage memory 104 includes a reception queue. The transmission queue information storage memory 114 holds one or a plurality of port transmission queues (first queues) that hold packet information related to the packets in order to output the packets to the destination, and packet information that is processed by the processor. And a discard transmission queue (second queue).

FIG. 2 shows a logical configuration diagram of the packet transfer control unit 102 and its peripheral blocks.
The reception queue control unit 106 analyzes the packet received by the packet transfer control unit 102 and stores the packet data in the packet storage memory 103. The reception queue information that is the result of the packet analysis is assigned to the reception queue information storage memory 104. Stored in the reception queue 104-1, and notifies the search control unit 105 that the data has been stored in the reception queue 104-1.
Based on the queue information stored in the reception queue 104-1, the search control unit 105 performs packet type determination, QoS search control, route search using a routing table, and discard determination whether to relay or discard a packet. In the discard determination, for example, it is determined to discard a packet for a blocked port or a port that cannot be transferred due to a failure. Note that the discard determination may be performed under appropriate determination conditions other than these.

  When relaying a packet, the search control unit 105 includes packet buffer information for identifying a packet buffer in which a corresponding packet is stored in the packet storage memory 103, searched path information, packet header analysis information, and The packet header is passed to the transmission queue control unit 107. In this specification, packet buffer information, searched route information, packet header analysis information, and packet header may be referred to as packet information. The packet information includes the determination result of necessity of relay.

On the other hand, when discarding a packet, the search control unit 105 adds discard factor information to the packet information and passes it to the transmission queue control unit 107. Note that route information may be omitted when discarding a packet.
The transmission queue control unit 107 receives a notification from the search control unit 105, and for packets that need to be relayed, the packet information (packet buffer information, path information, packet header analysis information, and packet header) from the search control unit 105 is transmitted to the transmission queue information. The data is stored in the port transmission queues 114-1 and 114-2 that are assigned to the storage memory 114 and correspond to the ports 108 and 109 specified by the path information.
After storing the packet information in the port transmission queues 114-1 and 114-2, the transmission queue control unit 107 reads out the packet stored in the packet storage memory 103 according to the packet buffer information and transmits it to the ports 108 and 109.

On the other hand, the transmission queue control unit 107 passes the packet information regarding the packet determined to be not relayed (discarded) to the filter control unit 201. Again, the packet information may include discard factor information. In this specification, the search control unit 105 and the transmission queue control unit 107 may be collectively referred to as a relay processing unit.
Whether or not the filter control unit (first control unit) 201 stores packet information such as discard factor information in the discard transmission queue (monitoring queue) 114-3 according to the discard factor configured by the processor 110. To determine. For example, if the set discard factor is included in the input discard factor information, it is determined to be stored in the discard transmission queue. In addition, the determination method can use the appropriate method according to the discard factor. When it is determined to store the information, the information stored in the discard transmission queue is transferred to the sampling control unit 202.

If the filter control unit 201 determines that the data is not stored, the filter control unit 201 discards the packet information, releases the buffer for the corresponding packet data stored in the packet storage memory 103, and discards the packet.
The sampling control unit (second control unit) 202 sets each piece of information such as discard factor information based on the configuration setting from the processor 110 regarding the transfer band designation that is a sampling condition for storing in the discard transmission queue 114-3. Is stored in the discard transmission queue 114-3. Here, the transfer band designation is speed information for storing information in the discard transmission queue, for example, and may be in packet units (pps rate) or byte units (bps rate). The discard transmission queue storage information (packet information) excluded from sampling is discarded by the sampling control unit 202, and the corresponding packet data stored in the packet storage memory 103 is also released from the buffer and discarded.

  The transmission queue control unit 107 reads the packet stored in the packet storage memory 103 based on the discard transmission queue information stored in the discard transmission queue 114-3, and uses the information including the discard factor stored in the discard transmission queue. In addition, the data is transferred to the processor 110. Note that packet transmission may be omitted, and discard transmission queue information (packet information) including a discard factor may be transferred to the processor 110.

  Note that the timing of transmission from the port transmission queues 114-1 and 2 to the ports 108 and 109 can be controlled by, for example, a timing control unit (shaper function) that determines the packet transmission scheduled time by the packet relay apparatus 100. Further, the transmission timing from the discard transmission queue 114-3 to the processor 110 may be an appropriate timing by the processor 110 or an appropriate timing controlled by another appropriate timing control unit.

FIG. 3 shows an example of a port transmission queue format stored in the port transmission queues 114-1 and 114-2.
The format of the port transmission queue includes packet buffer information, path information, packet header analysis information, and a packet header. The format of the port transmission queue is also information output from the search control unit 105 when it is determined to relay a packet.
The packet buffer information indicates a storage address of the packet storage memory 103 in which a packet corresponding to the transmission queue information is stored. In the route information, a route search result by the search control unit 105 is shown. The packet header analysis information shows the result of the packet header analysis performed by the search control unit 105. As a result of the header analysis performed by the search control unit 105, the generated packet header is stored when the packet header needs to be rewritten, and the original packet header is stored when the packet header is not rewritten. .

FIG. 4 shows a format example of the discard transmission queue stored in the discard transmission queue 114-3.
The format of the discard transmission queue includes packet buffer information, path information, packet header analysis information, packet header, and discard factor information. The format of the discard transmission queue is also information output from the search control unit 105 when it is determined that the packet is to be discarded.
When storing in the discard transmission queue 114-3, discard factor information is added to the port transmission queue format shown in FIG. 3 to enable the processor 110 to acquire detailed information of the discard factor.

  The discard factor information includes, for example, discard due to a search control unit failure, discard due to an internal interface failure, discard due to output physical port blockage, discard due to output QoS, and the like, but other appropriate discard factors may be used. , One or more of these may be included. The discard factor information can be determined by, for example, predetermining a discard factor number corresponding to the discard factor and using the discard factor number. The discard factor number may be appropriate identification information other than the number.

FIG. 5 shows a specific embodiment for adding a discard factor to a packet.
For packets transmitted to the ports 108 and 109, the packet data stored in the packet storage memory 103 is rewritten with packet header information stored in the port transmission queues 114-1 and 114-2. 108 and 109.
On the other hand, a packet to be transmitted to the processor 110 is transmitted to the processor 110 by adding the discard transmission queue information stored in the discard transmission queue 114-3 to the packet data stored in the packet storage memory 103.

FIG. 6 shows an example of a configuration setting screen related to the filter control unit 201 and the sampling control unit 202.
In the configuration setting screen example for the filter control unit 201 shown in FIG. 6A, a method of directly inputting (designating) a discard factor number to be filtered among the discard factor information shown in FIG. This section shows how to create a file that lists the discard factor numbers that you want to filter, and then specify that file and read it. It also shows how to cancel these designations. In addition, the filter control unit 201 passes information related to a packet of a specific DMAC (destination IP address), and the filter control unit 201 passes information related to a packet of a specific DIP (destination IP address). Then, a specification for enabling the processor 110 to collect data, and a method for canceling the designation for collecting these specific DMACs or specific DIPs are shown. Note that the discarding factor collected by the processor, in other words, the discarding factor that passes through the filter control unit 201 may be set by using a part of the above-described designation, or by other methods. The filter control unit 201 can collect information on a desired discard factor by passing packet information of the specified discard factor. In addition, the load on the processor can be reduced.

In the example of the setting screen for the sampling control unit 202 shown in FIG. 6B, the sampling control unit 202 can be designated for sampling by a transfer band (for example, pps rate, bps rate). In FIG. 6B, designation by the pps rate and the bps rate is shown, but either may be used, and other band information and speed information may be used. The sampling control unit 202 stores information in the discard transmission queue according to the designated transfer band, thereby reducing the load on the processor and avoiding communication congestion between the processor and the external display device.
The configuration setting can be performed from the processor 110 to the filter control unit 201. The processor 110 can input or read the configuration setting using an appropriate input unit and set it in the filter control unit.

FIG. 7 shows an example of a display screen that the processor outputs to the external display device.
When packet discard occurs due to a discard factor set during the operation of the apparatus, for example, the date and time, the discard location, and the discard factor are displayed on the screen of the external display device 113 via the processor 110 ((1) to (3) in the figure). ).
When the operator acquires information about a specific discard location, the command shown in (4) is input to display the number of discarded packets for each discard factor for the discard location as shown in (5). The example of FIG. 7 shows an example in which the discard location displays information about the network interface 1 (NIF1). The discard location can be identified by allocating the failure for NIF1 and the failure for NIF2 to separate discard factor numbers in the discard factor information. In addition to this, information on the discard location may be appropriately added.

When acquiring detailed information of a packet due to a specific discard factor, the detailed information of the packet shown in (7) to (9) is displayed by executing the command shown in (6). The information shown in (8) and (9) can be acquired from the packet header and packet data.
As described above, the queue information, the discard factor, and the packet data of the packet discarded in the conventional packet relay apparatus 100 are output to the processor 110, so that the information of the discarded packet can be collected and analyzed. The analysis of the discarded packet may be performed by the processor 110 or the external display device 113.

According to the present embodiment, the processor 110 collects and analyzes information, outputs and displays the discard factor statistics and the packet data determined to be discarded on the external display device 113, and causes the operator to discard based on the displayed information. Can be easily identified.
In addition, according to one aspect, a packet relay device and a collection of discarded packet information that enable queuing of packets determined to be discarded in the device, collect and analyze detailed information of the discarded packets, and identify the cause of the discard A system can be provided.

100, 111, 112 Packet relay device 101 Crossbar switch 102 Packet transfer control unit 103 Packet storage memory 104 Reception queue information storage memory 104-1 Reception queue 105 allocated to reception queue information storage memory Search control unit 106 Reception queue control unit 107 transmission queue control unit 108, 109 port 110 processor 113 external display device 114 transmission queue information storage memory 114-1 port transmission queue assigned to transmission queue information storage memory (first queue holding packet information)
114-2 Port transmission queue assigned to the transmission queue information storage memory (first queue holding packet information)
114-3 Discard transmission queue assigned to transmission queue information storage memory (second queue holding packet information)
201 Filter control unit 202 Sampling control unit

Claims (5)

A memory having a first queue that holds packet information about the packet to output the packet to a destination, and a second queue that holds packet information for processing by the processor;
It is determined whether the packet is to be relayed or discarded, and according to the determination result, the packet information is stored in the first queue when the packet is relayed. On the other hand, when the packet is discarded, the discard factor number or the discard factor identification information is set. A relay processing unit for distributing the added packet information to the second queue;
Packet information distributed to the second queue is input from the relay processing unit, a predetermined discard factor number or discard factor identification information to be filtered is preset, and includes the set discard factor number or discard factor identification information A first control unit that distributes packet information to the second queue, does not include the set discard factor number or discard factor identification information , and discards the packet information determined to discard the packet ;
Wherein the first packet information distributed to said second queue from the control unit of the input, predetermined transfer band or store speed is set in advance, in accordance with the set transfer bandwidth or storage rate, the packet information A second control unit for storing or discarding packet information in a second queue ;
A packet relay device.   The packet relay device according to claim 1, wherein the packet information stored in the second queue is output from the processor to a display unit. The packet relay device according to claim 2, wherein the processor outputs packet information including a discard factor number or discard factor identification information stored in the second queue to an external display device having a display unit. The packet information stored in the second queue includes at least one of a packet header, storage destination information indicating a packet storage destination, packet route information, and packet header analysis information that is a packet header analysis result, and discarding. The packet relay device according to claim 1 , comprising a factor number or discard factor identification information . A packet relay device;
A discard factor display device for displaying a discard factor of a packet discarded by the packet relay device;
The packet relay device is:
A memory having a first queue that holds packet information about the packet to output the packet to a destination, and a second queue that holds packet information for processing by the processor;
Determines whether to relay or discard the packet, and distributes packet information to the first queue when relaying the packet according to the determination result, and adds a discard factor number or discard factor identification information when discarding the packet A relay processing unit that distributes the packet information to the second queue ;
Packet information distributed to the second queue is input from the relay processing unit, a predetermined discard factor number or discard factor identification information to be filtered is preset, and includes the set discard factor number or discard factor identification information A first control unit that distributes packet information to the second queue, does not include the set discard factor number or discard factor identification information, and discards the packet information determined to discard the packet;
The packet information distributed to the second queue is input from the first control unit, a predetermined transfer band or storage speed is preset, and the packet information is set according to the set transfer band or storage speed. A second control unit for storing or discarding packet information in a second queue;
With
The discard packet information collection system, wherein the processor displays a discard factor based on packet information on the discard factor display device.

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