JP2009081816A - Packet-repeating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packet-repeating system for accurately counting the quantity of incoming packets for each classification, while effectively utilizing the hardware resources. <P>SOLUTION: A packet-repeating system includes an identifier acquisition part for extracting and acquiring a communication network identifier included in a packet each time a packet comes in; a register management table for storing the communications network identifier by associating it with any one of a plurality of register numbers; a statistical register part configured of a plurality of registers, with which unique register numbers are associated; and a management part for acquiring the register number associated with the communication identifier extracted and acquired by the identifier acquisition part from the register management table, and for issuing a count instruction accompanied with the register number. The statistical register part adds (increments) the count value shown by the register corresponding to the register number, whenever receiving the counter instruction accompanied with the register number. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a packet relay device that relays a packet on a communication network.

  In recent years, as the number of Internet users increases and the communication speed increases, the number of packets to be relayed by a packet relay device arranged on a communication network has greatly increased. In addition, strengthening of security functions for protecting communication terminals from attacks caused by viruses and the like made via communication networks is regarded as important. In response to this, packet monitoring such as identifying the type of packet coming from the communication network is generally performed, but statistical data obtained by monitoring with a significant increase in the type and number of packets to be monitored The types and numbers of these are also increasing. Specifically, it is necessary to increase the number of statistical counters that count the number of packets for each packet type and the number of bits of each statistical counter.

  In general, there are 4096 VLAN (Virtual LAN) ports virtually divided into physical LAN (Local Area Network) ports. In this case, for example, if there are 10 physical LAN ports, the number of VLAN ports is 4096 × 10 = 40960 ports. For example, when a 32-bit statistical counter is provided for all these ports, 40960 × 32 = 1310720 bits are required.

  In addition to statistical counters used for bandwidth management of communication networks and billing management of provided services, redundant statistical counters for investigating failures may be further provided, so the number of required statistical counters tends to increase. is there. In addition, as the transfer rate increases due to an increase in communication speed, the number of packets to be measured per unit time increases, so the number of bits required for one statistical counter also increases. For these reasons, in recent years, the number of register bits required for hardware has increased and the power consumption has also increased.

  For example, Patent Document 1 discloses a first counting unit that outputs a counting result of a plurality of bits obtained by performing a counting process according to a first counting permission signal as a lower part of an address and outputs a carry signal, A plurality of second counting means for outputting a 1-bit counting result obtained by performing a counting process in accordance with either the carry signal or the second count permission signal as an upper address and outputting a carry signal; Third counting means for outputting a counting result of a plurality of bits obtained by performing counting processing according to the carry signal from the second counting means of the stage as an upper part of the address; a plurality of second counting means according to the input of the selection instruction An address counter including a selection unit that selects any one of the two counting units and gives a second count permission signal to the selected second counting unit is disclosed. According to the counter, since the upper part of the bits of the address corresponding to the second counting means selected by the selection instruction is counted independently of the lower part, the number of bits can be made variable. It is said.

Further, in Patent Document 2, a counter circuit composed of a plurality of unit counters each outputting a count result and a carry signal is paired with one of the plurality of unit counters. A register comprising a plurality of registers for providing a pair of unit counters with a start bit selection signal for validly setting one of the carry signal and the power supply level from and a count enable signal for designating permission / prohibition of the counting operation of the unit counter A counting circuit having a circuit and a data bus connected to each input terminal of the counter and register circuit is disclosed. According to the counting circuit, by supplying the start bit selection signal and the count enable signal, the counter circuit can be divided into a plurality of independent counters each having an arbitrary bit length composed of one or more unit counters. It is said that hardware resources can be used efficiently by flexibly responding to the demands of the company.
JP-A-4-227582 JP-A-8-237112

  However, the inventions disclosed in Patent Documents 1 and 2 are intended to effectively utilize hardware resources by making the number of bits of the counter variable, but when these are applied to packet monitoring, The following problems arise. In other words, if the preset number of bits in the counter does not match the number of packets actually arriving at the packet relay device, or if the number of incoming packets changes significantly after setting the counter bits, the counter overflows Occurred, and there was a problem that accurate statistical information could not be collected. In addition, if the packet type set in the counter does not match the type of packet that actually arrives at the packet relay device, the counter does not count up at all, resulting in wasted hardware resources. there were.

  As described above, only the control of the number of bits of the counter as in the inventions disclosed in Patent Documents 1 and 2 can accurately count the number of incoming packets for each type while effectively using hardware resources in the packet relay apparatus. I could not. The present invention has been made in view of the above-described problems, and an object thereof is to provide a packet relay device that can accurately count the number of packets that arrive while making effective use of hardware resources for each type. To do.

  A packet relay device according to the present invention is a packet relay device including a reception unit that receives a packet via a communication network, and a transmission unit that transmits the packet received by the reception unit to another communication network, An identifier acquisition unit that extracts and acquires a communication network identifier included in the packet every time the reception unit receives the packet, and the communication network identifier extracted and acquired by the identifier acquisition unit is one of a plurality of register numbers A register management table stored in association with each other, a statistical register unit composed of a plurality of registers each associated with a unique register number, and a communication network identifier extracted and acquired by the identifier acquisition unit A management unit that obtains a register number from the register management table and issues a count instruction with the register number. Parts is characterized by obtaining a packet received total by adding the count value represented by the corresponding register to the register number for each receive count instruction with the register number.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
<First embodiment>
FIG. 1 is a block diagram showing a packet relay device 1 according to the present invention. The packet relay apparatus 1 is a packet relay apparatus such as a router having a function of transmitting the packet to a transfer destination based on address information in a header included in the received packet. The packet relay device 1 includes a transmission / reception unit 100, a PHY processing unit 200, an L2 processing unit 300, a processor 400, a storage unit 500, a PHY / MAC processing unit 600, and a transmission / reception unit 700. Here, it is assumed that the transmission / reception unit 100 is connected to a LAN (Local Area Network) and the transmission / reception unit 700 is connected to a WAN (Wide Area Network).

  The transmission / reception unit 100 is a physical port on the LAN side, and is connected to a LAN (not shown). The transmission / reception unit 100 gives a packet received from the LAN to the PHY processing unit 200.

  A PHY (Physical layer) processing unit 200 performs normal processing (for example, a physical layer) corresponding to a first layer of an OSI (Open Systems Interconnection) reference model on packets from the transmission / reception unit 100 and the L2 processing unit 300 (for example, , Electrical conversion of signals, etc.). The PHY processing unit 200 performs the process on the packet received from the transmission / reception unit 100 and supplies the packet to the L2 processing unit 300.

  The L2 (Layer 2) processing unit 300 includes a packet reception number counting unit 310 and a relay processing unit 320. Details of the packet reception number counting unit 310 will be described later.

  The relay processing unit 320 performs normal processing in the MAC (Media Access Control) layer corresponding to the lower sublayer of the data link layer (Layer 2) of the OSI reference model for the packet from the PHY processing unit 200. A function for performing processing, a function for performing communication routing processing between nodes on the LAN side based on information included in the header of the packet, and a function for performing MAC filtering processing for controlling connection by registering a MAC address ing. The relay processing unit 320 provides the processor 400 with a packet to be relayed to the WAN side.

  The processor 400 executes, for example, the processing program read from the storage unit 500, for example, packet filtering processing, address / port conversion processing, routing processing, and the like for packets from the relay processing unit 320 and the PHY / MAC processing unit 600. It has a function of performing predetermined processing such as port forwarding (transfer) processing. The processor 400 performs these predetermined processes on the packet, gives a packet to be relayed to the WAN side to the PHY / MAC processing unit 600, and gives a packet to be relayed to the LAN side to the relay processing unit 320.

  The storage unit 500 is a memory that stores a processing program, data necessary for various processes, and the like, and is, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory).

  The PHY / MAC processing unit 600 has a function of performing normal processing in the physical layer and the MAC layer on packets from the processor 400 and the transmission / reception unit 700. The PHY / MAC processing unit 600 performs these processes on the packet and gives the packet to be relayed to the WAN side to the transmission / reception unit 700.

  The transmission / reception unit 700 is a WAN-side physical port and is connected to a WAN (not shown). The transmission / reception unit 700 transmits the packet from the PHY / MAC processing unit 600 to the WAN, and provides the PHY / MAC processing unit 600 with the packet that has arrived from the WLAN.

  Hereinafter, the packet reception number counting unit 310 packet will be described. The packet reception number counting unit 310 includes a communication network identifier acquisition unit 311, a management unit 312, a register management table 313, and a statistical register unit 314.

  Each time the transmission / reception unit 100 receives a packet, that is, every time a packet is received from the PHY processing unit 200, the communication network identifier acquisition unit 311 receives a VLAN in the VLAN tag header defined in IEEE 802.1Q for the packet. A number (hereinafter referred to as VID) is extracted and acquired and given to the management unit 312. Usually, the transmission / reception unit 100, which is a physical port on the LAN side, has 4096 VLAN ports virtually divided, and each of these VLANs has a unique communication network identifier, that is, a VID. It is attached.

  The management unit 312 receives the VID from the communication network identifier acquisition unit 311, determines whether the VID is already registered in the register management table 313, and if it is not registered, the VID is one of a plurality of register numbers. And stored in the register management table 313. Normally, the management unit 312 sequentially registers VIDs in the order of register numbers. If the management unit 312 determines that the VID received from the communication network identifier acquisition unit 311 is already registered in the register management table 313, the management unit 312 acquires the register number corresponding to the VID from the register management table 313, and A count instruction with a number is given to the statistical register unit 314.

  The register management table 313 is a management table that can be stored by associating a VID given from the management unit 312 with any one of a plurality of register numbers. FIG. 2 is a diagram illustrating an example of a register management table. As shown in the figure, VID0, VID1,... VID2047 are stored in association with register numbers 0, 1, 2,. The register management table 313 may be configured by a CAM (Content Addressable Memory, also referred to as an associative memory or a content referenceable memory) having a register number as an address and VID as entry data. In this case, the management unit 312 gives the VID received from the communication network identifier acquisition unit 311 to the register management table 313 and performs a search. When the VID is already registered in the register management table 313, the management unit 312 can immediately receive a response of an address (register number) corresponding to the VID.

  The statistical register unit 314 includes registers 315-0 to 315-2047, and has a register number assigning unit that associates a unique register number with each of these registers. Here, it is assumed that the statistical register unit 314 associates register numbers 0, 1,..., 2047 with the registers 315-0, 315-1,. . FIG. 3 is a diagram illustrating the configuration of the register 315-0. As shown in the figure, the register 315-0 is composed of a 32-bit bit string of Bit0 to Bit32. Each of the registers 315-1 to 315-2047 has the same configuration as that of the register 315-0. The statistical register unit 314 uses each of the registers 315-0 to 315-2047 as a 32-digit binary counter.

  Each time the statistical register unit 314 receives a count instruction with a register number from the management unit 312, the statistical register unit 314 adds one count value represented by the register corresponding to the register number among the registers 315-0 to 315-2047 (hereinafter, (Referred to as increment). For example, when the VID extracted and acquired from the received packet by the communication network identifier acquisition unit 311 is VID0, the management unit 312 acquires the register number 0 associated with VID0 from the register management table 313 illustrated in FIG. Then, the count instruction with the register number 0 is given to the statistical register unit 314. At this time, the statistical register unit 314 increments the count value represented by the register 315-0 corresponding to the register number 0. For example, if the count value represented by the register 315-0 is 0, the statistical register unit 314 sets the count value to 1 in response to the count instruction. Since this process is performed every time the transmitting / receiving unit 100 receives a packet, the register 315-0 counts the total number of packets received that include VID0 in the header. Similarly, registers 315-1, 315-2,..., 315-2047 respectively count the total number of received packets that include VID1, VID2,.

  FIG. 4 is a flowchart showing a packet reception number counting processing routine. Hereinafter, a packet reception number counting process in which the packet reception number counting unit 310 counts the total number of packets received by each of the virtually divided VLAN ports in the transmission / reception unit 100 for each VID will be described with reference to FIG. .

  The packet received by the transmission / reception unit 100 is subjected to normal processing in the physical layer in the PHY processing unit 200 and then given to the L2 processing unit 300.

  The communication network identifier acquisition unit 311 extracts and acquires the VID in the VLAN tag header included in the packet from the PHY processing unit 200 (step S101), and gives this to the management unit 312.

  The management unit 312 determines whether or not the VID from the communication network identifier acquisition unit 311 is already registered in the register management table 313 (S102). When the management unit 312 determines that the VID is unregistered, the management unit 312 associates the VID with any one of the plurality of register numbers and stores it in the register management table 313 (S103). Subsequently, the management unit 312 gives a count instruction with a register number corresponding to the VID to the statistical register unit 314 (S105). For example, when the management unit 312 determines that VID3 is not registered, the management unit 312 stores this in association with the register number 3 as shown in FIG. To give.

  When the management unit 312 determines that the VID from the communication network identifier acquisition unit 311 is already registered in the register management table 313, the management unit 312 acquires the register number corresponding to the VID from the register management table 313 (S104). A count instruction with the register number is given to the statistical register unit 314 (S105). For example, if the management unit 312 determines that VID0 has been registered, the management unit 312 acquires the register number 0 associated with the VID0 as illustrated in FIG.

  In response to the count instruction with the register number, the statistical register unit 314 increments the count value represented by the register corresponding to the register number among the registers 315-0 to 315-2047 (S106). For example, the statistical register unit 314 increments the count value represented by the register 315-0 by one in response to the count instruction with the register number 0.

  If there is an instruction to end counting from a control unit (not shown) (S107), the management unit 312 performs a statistical register unit 314 in response to the count value of each of the registers 315-0 to 315-2047. The total number of reception is output (S108). If there is no instruction to end counting, the processing from step S101 is repeated, and the count of the total number of received packets for each VID is continued.

As described above, according to the packet relay apparatus according to the present embodiment, the VID in the VLAN tag header included in the received packet is extracted and acquired, and the VID is associated with one of a plurality of register numbers in the register management table. Remember. Therefore, the VID can be dynamically allocated to 2048 registers according to the VID included in the received packet without counting the VID to be counted in advance by the user, and can be counted for each VID. . In the case of a device in which a user allocates a VID to be counted in advance to each register as in the conventional device, when a packet containing an undesignated VID arrives, there is a problem that the packet is not counted at all. On the other hand, according to the packet relay apparatus according to the present embodiment, since the VID is dynamically allocated to each register, such a problem does not occur, and the total number of received packets can be accurately counted for each VID. It is possible to effectively use 2048 registers, which are allocated hardware resources.
<Second Embodiment>
Different parts from the first embodiment will be described in detail below. The statistical register unit 314 in the present embodiment further includes bit string grouping means and register number additional assigning means.

  The statistical register unit 314 uses a bit string grouping unit to group the bit strings constituting the register into at least two bit strings for each of the registers 315-0 to 315-2047, and a plurality of groups each representing an individual count value. A divided bit string is obtained.

  The statistical register unit 314 associates a unique register number with the grouping-target statistical register so as to correspond to each grouping bit string obtained by the grouping, by using a register number additional assigning unit.

  The statistical register unit 314 includes a total of 2048 registers 315-0 to 315-2047. Since each of the registers 315-0 to 315-2047 is used to count the total number of received packets including different VIDs, up to 2048 types of VID packets are counted without grouping the bit strings of the registers. can do. The statistical register unit 314 uses the bit string grouping means and the register number additional assigning means described above in order to be able to count the total number of received VID packets of the 2049th type or more.

  FIG. 5 is a diagram illustrating the configuration of the register 315-0 after the bit string grouping. The register 315-0 originally comprises a 32-bit bit string of Bit0 to Bit32, and the register number 0 is assigned by the statistical register unit 314 by default. In the figure, the registers 315-0 are grouped into Bit0 to Bit15 and Bit16 to Bit31 by the bit string grouping means. Further, the register number additional assigning means associates the register number 0 with the grouping bit string composed of Bit0 to Bit15 and the register number 2048 with the grouping bit string composed of Bit16 to Bit31. In this way, the statistical register unit 314 groups the bit strings constituting one register, and uses the grouped bit strings Bit0 to Bit15 and the grouped bit strings Bit16 to Bit31 as 16-digit binary counters, respectively. .

  Each time the statistical register unit 314 receives a count instruction with a register number from the management unit 312, the statistical register unit 314 increments the count value represented by the grouping bit string corresponding to the register number by one. For example, when receiving the count instruction with the register number 0, the statistical register unit 314 increments the count value represented by the binary counter of the grouping bit string Bit0 to Bit15 corresponding to the register number 0 by one. Similarly, when receiving the count instruction with the register number 2048, the statistical register unit 314 increments the count value represented by the binary counter of the grouping bit string Bit16 to Bit31 corresponding to the register number 2048 by one. As a result, the statistics register unit 314 can obtain the total number of received packets including VID0 and VID2048 in one register 315-0.

  FIG. 6 is a flowchart showing a packet reception number counting routine including a bit string dividing process. Hereinafter, the packet reception number counting process including the bit string dividing process will be described with reference to FIG. Note that the statistical register unit 314 associates register numbers 0, 1,..., 2047 with registers 315-0, 315-1,.

  The processing from step S201 to S205 is the same as in the first embodiment. Similarly, when the transmitting / receiving unit 100 receives a packet including the 2048th and subsequent VIDs in the VLAN tag header, the VID is stored in the register management table 313 in association with the register number. FIG. 7 is a diagram illustrating an example of a register management table stored including the 2048th and subsequent VIDs. As shown in the figure, VID0, VID1,... VID2047 are associated with register numbers 0, 1, 2,..., 7FFh, respectively, and VID2048, VID2049,. 800h, 801h, 2,..., FFFh are stored in association with each other.

  When receiving the count instruction with the register number from the management unit 312, the statistical register unit 314 determines whether or not the register number is an assigned register number (S 206). When the statistical register unit 314 determines that the register number of the count instruction has not been assigned, the bit register group allocating unit and the register number adding / assigning unit allocate any bit string in the registers 315-0 to 315-2047. Grouping is performed, and an individual register number is associated with each grouping bit string (S207). For example, when receiving the count instruction with the register number 2048, the statistical register unit 314 groups the register 315-0 into grouping bit strings Bit0 to Bit15 and Bit16 to Bit31 as shown in FIG. Register number 0 and grouping bit string Bit16 to Bit31 are associated with register number 2048. Subsequently, the statistical register unit 314 increments the count value represented by the grouping bit string Bit16 to Bit31 by one (S208).

  If the statistical register unit 314 determines that the register number of the count instruction is an assigned register number, the statistical register unit 314 increments the count value represented by the register or grouping bit string associated with the register number by one (S208). . For example, the statistical register unit 314 increments the count value represented by the grouping bit strings Bit0 to Bit15 by one in response to a count instruction with register number 0, and registers 315-1 in response to the count instruction with register number 1 The count value represented by is incremented by one.

  The management unit 312 repeats the processing from step S201 and continues to count the total number of received packets for each VID until there is a count end instruction from a control unit (not shown) (S209). When receiving the count instruction with the register number 2049, the statistical register unit 314 groups the register 315-1 into the grouping bit strings Bit0 to Bit15 and Bit16 to Bit31, and the grouping bit string Bit0 to Bit0. Register number 1 can be associated with Bit 15 and register number 2049 can be associated with grouping bit string Bit 16 to Bit 31. Similarly, the statistical register unit 314 includes a register 315-2, a register 315-3,..., A register 315-2047, a register number 2 and 2050, a register number 3 and 2051,. And 4095 can be associated with each other.

  If there is an instruction to end counting from a control unit (not shown) (S209), the management unit 312 performs the statistical register unit 314 in response to each of the registers 315-0 to 315-2047 or the grouping bit string. The count value is output as the total number of received packets (S210).

  As described above, according to the packet relay apparatus according to the present embodiment, the bit strings constituting one register are grouped into two bit strings, and each of the plurality of grouped bit strings obtained by the grouping is used as one counter. By doing so, the total number of received packets can be counted for each of 4096 types of VIDs using 2048 registers 315-0 to 315-2047.

  The user can set whether to enable or disable the bit string grouping means and the register number additional assigning means by the statistical register unit 314 depending on the situation. The setting is performed when the user gives a valid / invalid setting command to the statistical register unit 314. In the case of invalid setting, the total number of reception is not counted for the packets including the 2049th and subsequent VIDs, and the total number of receptions is counted for all the 32 bits of each register for the packets including the 2048th VID.

In this embodiment, each of 2048 registers is divided into two bit strings, and the total number of received packets is counted for each of 4096 VIDs. For example, each of 512 registers is divided into four bit strings. A modification example is possible in which the total number of received packets is counted for each of 4096 types of VIDs.
<Third embodiment>
Different parts from the second embodiment will be described in detail below. FIG. 8 is a block diagram showing a packet reception number counting unit 310 further including a link state monitoring unit 316.

  The link state monitoring unit 316 acquires link information including a set communication rate for each port from the PHY processing unit 200. In normal LAN communication, packets are communicated after setting a communication rate with a communication partner device (not shown). In communication using a LAN interface, generally, one of three communication rates of 1000 Mbps, 100 Mbps, and 10 Mbps can be set.

  The PHY processing unit 200 includes the set communication rate according to the setting in the link information and notifies the link state monitoring unit 316 or stores the set communication rate in the link information. The link state monitoring unit 316 acquires link information notified from the PHY processing unit 200 or periodically acquires link information stored in the PHY processing unit 200. The link state monitoring unit 316 provides the link information obtained by the acquisition to the management unit 312 while monitoring the link state of the interface in this way.

  The management unit 312 in the present embodiment includes an extended operation setting table. FIG. 9 shows an extended operation setting table. The extended operation here is an operation by the bit string grouping means and the register number additional assigning means by the statistical register unit 314. “User extended operation setting” in the figure indicates whether or not to allow the user to set the validity / invalidity of “extended operation” by “valid” and “invalid”. “Setting communication rate” in the figure represents communication rates of 1000 Mbps, 100 Mbps, and 10 Mbps.

  “Extended operation” in the figure indicates whether the bit string grouping means and the register number additional assigning means by the statistical register unit 314 are “valid” or “invalid”. The validity / invalidity can be set in advance by the user. Normally, when the communication rate is low, the number of received packets per unit time is small, so the number of counter bits required for measurement can be small. On the other hand, when the communication rate is high, the number of received packets per unit time is large, and thus a large number of bits are required. Depending on the situation, the user can set “expanded operation” to “invalid” when priority is given to the number of bits (number of packets that can be counted), and “expanded operation setting” when priority is given to the number of VID types that can be counted. Set to “Enable”.

  Here, it is invalid when the communication rate is 1000 Mbps, which is a high communication rate, and is valid when the communication rates are 100 Mbps and 10 Mbps, which are relatively low. In addition, since the “user extended operation setting” for the “set communication rate” of 1000 Mbps, 100 Mbps, and 10 Mbps is “valid”, the user can set the “expanded operation setting” for each communication rate to “valid” or “ Can be reset to “invalid”.

  The management unit 312 updates the link information table based on the link information acquired from the link state monitoring unit 316. FIG. 10 is a diagram illustrating an example of the link information table. The management unit 312 updates the link information table based on the communication rate for each port included in the link information. As shown in the figure, a communication rate is associated with each VID and stored in the link information table. In the link information table, in addition to the communication rate, other link-related information can be associated for each VID as necessary.

  Based on the information in the register management table, the extended operation setting table, and the link information table, the management unit 312 gives a setting command for instructing the valid / invalid setting of the extended operation for each register number to the statistical register unit 314. For example, the management unit 312 acquires the register number 0 associated with VID0 from the register management table (FIG. 7), and the communication rate 1000 Mbps associated with VID0 in the link information table (FIG. 10) is expanded. Since the extended operation is set to “invalid” in the operation setting table (FIG. 9), a setting command indicating that the extended operation for the register of register number 0 should be invalidated is given to the statistical register unit 314. The management unit 312 similarly gives a setting command to the statistical register unit 314 for other register numbers. Normally, the management unit 312 gives a setting command to the statistical register unit 314 every time link information is acquired from the link state monitoring unit 316.

  In this embodiment, the statistical register unit 314 validates the extended operation, that is, the bit string grouping unit and the register number additional assigning unit, in response to a setting command that instructs valid / invalid setting of the extended operation for each register number from the management unit 312. Further included is an extended operation setting means for setting invalidity for each register. For example, when the statistical register unit 314 receives a setting command from the management unit 312 to invalidate the extended operation for the register of register number 0, the extended operation for the register 315-0 is invalidated accordingly. To do. Thus, the register 315-0 operates as a 32-bit counter while the setting is valid. The statistical register unit 314 similarly performs setting processing for valid / invalid of the extended operation for the registers 315-1 to 315-2047.

  FIG. 11 is a flowchart showing an extended operation valid / invalid setting processing routine. Hereinafter, the extended operation valid / invalid setting process will be described with reference to FIG.

  The link state monitoring unit 316 acquires link information including the set communication rate for each port from the PHY processing unit 200 (step S301). The management unit 312 acquires link information from the link state monitoring unit 316, and updates the link information table as shown in FIG. 9 based on this (S302). Based on the information in the register management table, the extended operation setting table, and the link information table, the management unit 312 gives a setting command indicating the valid / invalid setting of the extended operation for each register number to the statistical register unit 314 (S303). The statistical register unit 314 sets the expansion operation for each register in response to a setting command from the management unit 312. The processing routine is periodically executed, and the extended operation is dynamically set to enable / disable according to the set communication rate for each port.

  As described above, the packet relay apparatus according to the present embodiment includes the extended operation setting table in which the set communication rate is associated with the valid / invalid setting of the extended operation, and periodically acquires the set communication rate for each port. Based on this, enable / disable of the extended operation for each register is set. For example, when the set communication rate is relatively low, the extended operation is enabled, and when the set communication rate is relatively high, the extended operation is disabled. Made. As a result, when the set communication rate is relatively low, the number of VID types to be counted can be increased. Conversely, when the set communication rate is relatively high, the number of received packets that can be counted can be increased. .

  In the first to third embodiments, the case where the transmission / reception unit 100 is one physical LAN port has been described. However, the same effect can be obtained when the transmission / reception unit 100 includes a plurality of physical LAN ports. Can do. FIG. 12 is a block diagram showing transmission / reception unit 100, PHY processing unit 200, and L2 processing unit 300 including connectors 110-1 to 110-n. Each of the connectors 110-1 to 110-n is a physical port on the LAN side. The L2 processing unit 300 includes the same number of packet reception count units 310-1 to 310-n as the connectors 110-1 to 110-n. Packet reception counters 310-1, 310-2,..., 310-n receive packets for each VID type for the packets received by connectors 110-1, 110-2,. By counting the total number, the same effects as in the first to third embodiments can be obtained.

It is a block diagram showing a packet relay apparatus. It is a figure showing an example of a register management table. It is a figure showing the structure of a register. It is a flowchart showing a packet reception number counting process routine. It is a figure showing the structure of the register | resistor after bit stream grouping. It is a flowchart showing a packet reception number counting process routine including a bit string dividing process. It is a figure showing an example of a register management table. It is a block diagram showing the packet reception number counting part containing a link state monitoring part. It is a figure showing an extended operation | movement setting table. It is a figure showing an example of a link information table. It is a flowchart showing an extended operation valid / invalid setting processing routine. It is a block diagram showing the transmission / reception part containing a some connector, a PHY process part, and an L2 process part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packet relay apparatus 100 Transmission / reception part 110-1 to 110-n Connector 200 PHY processing part 300 L2 processing part 310, 310-1 to 310-n Packet reception number counting part 311 Communication network identifier acquisition part 312 Management part 313 Register management table 314 Statistics register unit 315-0 to 315-2047 register 316 Communication rate information acquisition unit 400 Processor 500 Storage unit 600 PHY / MAC processing unit 700 Transmission / reception unit 710 Connector

Claims (4)

A packet relay device comprising: a receiving unit that receives a packet via a communication network; and a transmission unit that transmits a packet received by the receiving unit to another communication network,
An identifier acquisition unit that extracts and acquires a communication network identifier included in the packet every time the reception unit receives the packet;
A register management table for storing the communication network identifier extracted and acquired by the identifier acquisition unit in association with any one of a plurality of register numbers;
A statistical register section consisting of a plurality of registers each associated with a unique register number;
A management unit that obtains a register number associated with the communication network identifier extracted and acquired by the identifier acquisition unit from the register management table and issues a count instruction with the register number, and
Each time the statistical register unit receives a count instruction with the register number, it adds the count value represented by the register corresponding to the register number to obtain the total number of received packets. The statistics register unit is
Bit string grouping means for grouping the bit strings constituting the register into at least two bit strings and obtaining a plurality of grouped bit strings each representing an individual count value;
Register number additional assigning means for associating a unique register number with the grouping target statistical register so as to correspond to each of the grouping bit strings,
The value obtained by adding the count value represented by the grouping bit string corresponding to the register number every time the count instruction with the register number is received is defined as the total number of received packets. Packet relay device.   3. The packet relay apparatus according to claim 2, wherein the statistical register unit further includes extended operation setting means for setting validity / invalidity of the bit string grouping means and register number additional assigning means in response to a setting command. .   4. The packet relay apparatus according to claim 3, wherein the setting command is a command based on at least one of a port link status and a packet communication rate.

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