JP2004080524A - Communication quality assigning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication quality assigning system capable of flexibly assuring the quality. <P>SOLUTION: Identification information (address information) for identifying a transmission source or a destination of reservation available traffics and a plurality of quality parameters (first candidate quality QoS1 and second candidate QoS2), which can be provided to one of the traffics and are ranked are previously correlated and registered in a policy table. When a reservation request message containing the identification information is issued, it is determined whether the identification information contained in the reservation request message is registered in the policy table. When the information is determined already registered in the policy table, the quality parameter which can be assigned to a packet relay apparatus and has the highest priority is selected from among the plurality of quality parameters, corresponding to the identification information, and the communication quality specified, depending on the selected quality parameter, is assigned to the packet relay apparatus relaying the traffic which has been requested to reserve. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication quality assignment system for assigning communication quality of a packet of a computer network that relays a packet via a packet relay device based on contents registered in advance in a policy table. It relates to technology for enabling allocation.
[0002]
[Prior art]
Among the computer networks, in the Internet that transmits information in units of packets, a packet relay device (router) that selects and relays an optimal communication path based on identification information of a destination included in the packet, between servers, The server terminals are connected.
[0003]
The packet relay device stores the received packet in the buffer, searches the routing table with the destination identification information included in the packet, selects the communication path closest to the destination, and reads the packet from the buffer Is sent to the selected channel.
[0004]
In the Internet where packets are transmitted while being relayed by a packet relay device, the amount of packets transmitted over the network varies greatly depending on the region and time because many unspecified people use them at unspecified timing. Thus, sometimes a packet exceeding the relay capability is generated locally.
[0005]
In such a case, packet discard processing has been conventionally performed. However, in recent years, there are many businesses that perform information distribution services on the Internet for a fee, and communication quality that can transmit information to the other party without omission has been required. .
[0006]
This communication quality is generally called QoS (Quality of Service), and an IntServ (Integrated Service) system has been proposed to realize this QoS.
[0007]
IntServ assigns a quality such as a requested bandwidth to each communication on a communication line, such as a digital dedicated line or ATM, and RSVP (Resource reServation Protocol) is used to assign the bandwidth. A control protocol is used.
[0008]
In the band allocation procedure by RSVP, as shown in FIG. 13, first, a path message requesting a band required for information transmission is transmitted from the transmission node (terminal or server) 1 to the reception node 2.
[0009]
This path message is relayed by a plurality (three in this case) of packet relay apparatuses 10a, 10b and 10c on the network and transmitted to the receiving node 2. At this time, each of the packet relay apparatuses 10a to 10c Remember the message.
[0010]
Then, the receiving node 2 makes preparations for receiving information based on the received path message, and returns a reserve message to the sending node 1 indicating that the preparation has been completed.
[0011]
This reserve message is relayed in the order of the packet relay devices 10c, 10b, and 10a in reverse to the transmission of the path message and sent to the transmission node 1. Each packet relay device 10a to 10c is reserved from the reception node 2 side. The message is confirmed, and the bandwidth requested by the path message stored in advance is allocated for information transmission from the transmission node 1 to the reception node 2.
[0012]
Specifically, the bandwidth allocation is performed by searching the policy table 11 in which the source and destination addresses and the quality assurance parameters assigned to the packet transmission between them are associated with each other based on the parameters. The buffer capacity, the reading speed from the buffer, the timing, and the like are set.
[0013]
In the example shown in FIG. 13, the policy table 11 is provided in each packet relay device 10. However, as shown in FIG. 14, the policy table is stored in the policy server (PDP server) 6 installed in the network. 11 is provided, and the policy server 6 searches the policy table 11 in response to an inquiry from each packet relay apparatus 10 and notifies the inquiry result packet relay apparatus 10 (referred to as a COPS system).
[0014]
FIG. 15 shows an example of the contents of the policy table 11 for the combination (filter unit) of the destination of the quality assurance target and the IP address (including mask information) of the transmission source, and the combination of the addresses. Parameters such as a guaranteed minimum rate, maximum rate, and maximum delay are stored in association with each other.
[0015]
Each packet relay device 10 relays a packet based on this parameter, thereby establishing a dedicated transmission path of a predetermined band between the transmission node 1 and the reception node 2, and the transmission node 1 to the reception node 2. On the other hand, packet transmission in a predetermined band is possible.
[0016]
[Problems to be solved by the invention]
However, in the above-mentioned RSVP quality assurance, when there is a reservation request for traffic registered in the policy table, a best effort without quality assurance is unconditionally assigned if there is no room in the line. There was a problem of lack of degree.
[0017]
An object of the present invention is to solve this problem and to provide a communication quality allocation system capable of flexible quality assurance.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the communication quality allocation system according to claim 1 of the present invention comprises:
Communication quality assignment for assigning packet communication quality by the packet relay device of the computer network that relays the packet via the packet relay device (30) based on the contents registered in advance in the policy table (46, 54) In the system,
In the policy table, identification information for identifying a source or destination of traffic that can be reserved and a plurality of ranked quality parameters that can be assigned to the single traffic are registered in association with each other in advance. Configuration
When there is a reservation request message including identification information for specifying a transmission source or a destination, determination means (45, 53) for determining whether or not the identification information included in the reservation request message is registered in the policy table )When,
When it is determined that the identification information included in the reservation request message is registered in the policy table, among the plurality of quality parameters corresponding to the identification information, it can be assigned to the packet relay apparatus and has the highest rank. Selection means (45, 53) for selecting high quality parameters,
The communication quality determined by the quality parameter selected by the selection means is assigned to a packet relay device that relays the traffic requested for reservation.
[0019]
A communication quality allocation system according to claim 2 of the present invention is the communication quality allocation system according to claim 1,
The policy table, determination means and selection means are provided in the packet relay device.
[0020]
A communication quality allocation system according to claim 3 of the present invention is the communication quality allocation system according to claim 1,
The policy table, determination means, and selection means are provided in a policy determination device (50) capable of communicating with the packet relay device,
The policy judgment device receives the request from the packet relay device, performs the judgment processing by the judgment means and the selection processing by the selection means, and notifies the packet relay device of the selected quality parameter. Yes.
[0021]
Moreover, the communication quality allocation system of Claim 4 of this invention is the communication quality allocation system in any one of Claims 1-3,
When the low-order quality parameter selected by the selecting means includes a parameter for instructing packet discard, the packet relay device discards the requested traffic packet.
[0022]
Moreover, the communication quality allocation system of Claim 5 of this invention is the communication quality allocation system in any one of Claims 1-3,
The policy table includes, in advance, identification information that identifies a source or destination of traffic that can be reserved, a plurality of quality parameters that can be assigned to the single traffic, and specific parameters. It is a configuration that is registered in association with,
When a low-order quality parameter is selected by the selecting means, an alert process corresponding to the specific parameter is executed.
[0023]
Moreover, the communication quality allocation system of Claim 6 of this invention is the communication quality allocation system in any one of Claims 1-3,
The policy table includes, in advance, identification information that identifies a source or destination of traffic that can be reserved, a plurality of quality parameters that can be assigned to the single traffic, and specific parameters. It is a configuration that is registered in association with,
When a low-order quality parameter is selected by the selection means, an update means (45,) that updates the contents of the policy table so as to increase the rank of the selected quality parameter corresponding to the specific parameter. 52).
[0024]
Moreover, the communication quality allocation system of Claim 7 of this invention is the communication quality allocation system in any one of Claims 1-3,
Monitoring means (35) for monitoring the use state of the line;
Update means (45, 52) for updating the contents of the policy table based on the monitoring result of the monitoring means is provided.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a main part of a packet relay apparatus 30 including a communication quality assignment system of the present invention, and FIG. 2 shows a network including the packet relay apparatus 30. However, in FIG. 2, the packet relay device 30 does not include a policy table and may not perform determination processing and selection processing described later.
[0026]
In FIG. 1, a network processor 31 performs classification of packets input via an input / output interface (not shown), rewriting for routing, flow table creation processing, and the like. A flow management database 33 and a flow table 34 are provided.
[0027]
The packet classifier 32 refers to the flow table 34 to check whether or not the received packet matches the flow table 34. If it is guaranteed, the packet classifier 32 is a queue dedicated to that flow (hereinafter referred to simply as Q). The ID is output to the traffic manager 35 together with the packet. For packets that are not guaranteed, the best effort queue (QID = 0) is output to the traffic manager 35 together with the packets.
[0028]
The flow table 34 is created based on the flow management database 33 in which information relating to traffic flows is stored. For example, as shown in FIG. 3, identification information of a flow whose bandwidth is secured, that is, a destination An IP address, a source IP address, a protocol, a destination port number, a source port number, and a QID for identifying a bandwidth allocated to those flows.
[0029]
The traffic manager 35 is for performing quality assurance assignment and scheduling processing for traffic, and has a plurality of sets of buffers 36, a packet scheduler 37, and a traffic management database 38, and commands from the network processor 31. The packet is stored in the buffer corresponding to the QID.
[0030]
Further, the packet scheduler 37 reads out the packets stored in the buffer 36 dedicated to the guaranteed flow out of the buffers 36 according to the parameters stored in the traffic management database 38, and sends them out via an input / output interface (not shown). Packets stored in non-guaranteed buffers are read and sent by best effort processing.
[0031]
In the traffic management database 38, for example, as shown in FIG. 4, information on minimum rate, maximum rate, maximum delay, and output port is preset for each QID.
[0032]
The RSVP processing unit 40 receives the path message and the reserve message, notifies the routing processing unit 41 of the received path message and causes the routing table 42 to be searched, and also notifies the reservation reception processing unit 45 of the path message and the reserve message.
[0033]
The reservation acceptance processing unit 45 constitutes the determination means and selection means of this embodiment, and has three operation modes, a local mode, an outsourcing mode, and a bilingual mode. When the mode or the bilingual mode is designated, it is determined whether or not the traffic corresponding to the notified message is registered in the policy table 46, and if it is registered, the quality parameter corresponding to the identification information is set. Notify the traffic manager 35.
[0034]
For example, as shown in FIG. 5, the policy table 46 is configured so that a filter for extracting reservable traffic and a quality parameter for specifying quality required for the traffic can be stored in association with each other. Has been.
[0035]
The filter unit of the policy table 46 includes data obtained by masking the destination IP address and the source IP address of the traffic, and the reservation reception processing unit 45 performs the processing for the destination IP address and the source IP address included in the notified message. Then, it is determined whether or not the data of the filter unit is searched and registered with data obtained by a predetermined masking process.
[0036]
In the quality assurance column of the policy table 46, a plurality of ranked quality parameters can be registered for each traffic. In this example, the first candidate quality (QoS1) and the second candidate quality (QoS2) are registered. The parameters are set.
[0037]
For each reserved traffic, the policy ID and the priority between the traffics can be designated by L (low) or H (high).
[0038]
The reservation reception processing unit 45 determines whether or not the traffic requested by the notified message is the traffic for which the guarantee is requested. Select parameters.
[0039]
That is, when it is determined that the requested traffic is the traffic for which the guarantee is requested, the trough traffic management database 38 is checked, and the first candidate quality QoS 1 having a high rank has a sufficient line capacity, and the traffic is It is determined whether or not allocation is possible. If allocation is possible, information about the traffic is notified to the network processor 31 and the traffic manager 35, and the flow table 33 and the traffic management database 38 are updated and created.
[0040]
Specifically, if the traffic output ports are P1 to Pn, the sum of the maximum rates of the queues in which the P1 port of the traffic management database 38 is the output port is to be newly assigned from the line capacity of P1. If it is smaller than the result of reducing the maximum traffic capacity, the bandwidth of the traffic can be guaranteed.
[0041]
Similarly, the above calculation is performed for the ports P2 to Pn, and if the bandwidth can be guaranteed at all the output ports, the information about the traffic is notified to the network processor 31 and the traffic manager 35, and the flow table 33, the traffic management database 38, Make update.
[0042]
If the first candidate quality QoS1 cannot be assigned, the second candidate quality QoS2 is assigned. In this case, referring to the alert action column of the policy table 46, if an action is designated. Then, an action for notifying the user that the first candidate quality QoS1 could not be assigned is executed.
[0043]
The second candidate quality QoS2 includes best effort quality (specifically, a minimum bandwidth value of 0) or discard (Discard, specifically minimum) in addition to parameters such as maximum rate and minimum rate for determining quality. Band value -1) can be specified.
[0044]
Furthermore, an output port can be defined in the entry of the policy table 46.
[0045]
That is, in the case of the first candidate quality Qos1, a bandwidth is allocated to an output port facing the route with the lowest path cost according to the routing table, but a large amount of bandwidth has already been allocated to the output port, and it is difficult to allocate more than that. When allocating the second candidate quality QoS2 in the above case, the bandwidth is narrowed down to the same output port (output port facing the path with the lowest path cost) as before (ie, with the quality of the second candidate quality QoS2). And the case of outputting in the band of the first candidate quality QoS1 to the designated output port.
[0046]
When the bilingual mode is designated, the reservation reception processing unit 45 searches the policy table 46 in the same manner as described above, and when the requested traffic is not found, the reservation reception processing unit 45 is shown in FIG. The PDP server 50 on the network is inquired, the quality notified in response to the inquiry is registered in the policy table 46, the information is notified to the network processor 31 and the traffic manager 35, and the flow table 33 and the traffic management are registered. The database 38 is updated and created.
[0047]
When the outsourcing mode is designated, the reservation reception processing unit 45 makes an inquiry to the PDP server 50 without searching the policy table 46, and the quality information notified in response to the inquiry is sent to the network processor 31 and The traffic manager 35 is notified and the flow table 33 and the traffic management database 38 are updated and created.
[0048]
When the packet relay apparatus 30 operates only in the outsourcing mode, the policy table 46 is not necessary, and the reservation reception processing unit 45 sends an inquiry to the PDP server 50 and assigns the quality notified from the PDP server 50. Etc. are performed.
[0049]
In addition, the reservation acceptance processing unit 45 of the packet relay device 30 sends an Adjust (arbitration request) message to the PDP server 50, requests redistribution of the policy table of the PDP server 50, and distributes again by COPS-PR. You can request to send the revised policy table.
[0050]
At this time, the PDP server 50 that has received the Adjust message changes the content of the first candidate quality QoS1 of the traffic specified as L in the priority of the policy table in the server to the content of the second candidate quality QoS2 of lower order. Overwrite with and update.
[0051]
As an actual operation mode, the value of each parameter of the second candidate quality QoS2 is always set to a value smaller than the value of the first candidate quality QoS1 (the quality is lowered).
The packet relay device 30 that has received the contents of the policy table rewritten by this overwriting reallocates the bandwidth and narrows down all available bandwidths of the low priority traffic.
[0052]
By this processing, a margin is generated in the line, and a new traffic bandwidth allocation request can be accepted again.
[0053]
The Adjust message is sent to the PDP server 50 when the bandwidth allocation requested by the packet relay device 30 (assignment of the first candidate quality) has failed, and the traffic manager 35 periodically indicates the load state of the line. Monitoring may be sent to the PDP server 50 when there is no room in the line and congestion occurs.
[0054]
6 and 7 are flowcharts showing the processing procedure of the packet relay device 30. FIG. Hereinafter, based on this flowchart, a specific operation example of the communication quality assignment system of the present invention will be described.
[0055]
As shown in FIG. 6, first, when a message (path message, reserve message) including the destination IP address D and the source IP address S is received by RSVP, the packet relay device 30 addresses from the routing table 42. The destination IP address D is searched (S1, S2).
[0056]
When this destination IP address D is found, the output IF (interface number) of the routing table 42 is substituted into a variable (output IF) (S3, S4).
[0057]
Then, the designated operation mode is checked, and when the local mode or the bilingual mode is designated, the traffic is searched from the policy table 46. If there is the traffic, the parameter of the first candidate quality QoS1 corresponding thereto is searched. If traffic is not registered in the policy table 46, flow registration is performed at best effort (S5 to S9).
[0058]
If the requested traffic is not found in the policy table 46 when the bilingual mode is specified, or if the outsourcing mode is specified, the PDP server 50 is inquired using the COPS protocol, and the PDP server When the guaranteed quality is notified from 50, the parameter of the quality is acquired, and when notified from the PDP server 50 that the guaranteed quality is not notified, the best effort is registered for the traffic (S10 to S13).
[0059]
Next, as shown in FIG. 7, the restriction at the output port is checked for the acquired guaranteed quality, and it is determined whether or not the line has a margin (S14, S15).
[0060]
That is, when the total value of the currently allocated line allocation amount Sum (output IF) and the acquired maximum rate of the first candidate quality QoS1 is smaller than the allowable maximum capacity, it is determined that the line has a margin, and this first The parameter of 1 candidate quality QoS1 is notified to the traffic manager 35 to register the traffic flow, and the value of the total capacity Sum (output IF) is updated with the total value (S16, S17).
[0061]
When it is determined that there is no room in the line, it is checked whether or not there is designation in the output IF column of the entry of the policy table 46. If there is no designation, the maximum rate column of the second candidate quality QoS2 is examined. If specified, the output IF is substituted into a variable (output IF), and then the maximum rate column of the second candidate quality QoS2 is examined (S18 to S20).
[0062]
If the content of the maximum rate column of the second candidate quality QoS2 is a parameter indicating “discard”, the traffic flow of QID = −1 is registered for the variable (output IF), and the content of the maximum rate column Is a parameter indicating “best effort”, a traffic flow of QID = 0 is registered for the variable (output IF), and if the content of the maximum rate column is any other value, the variable (output IF) On the other hand, the traffic flow determined by the value is registered (S21 to S23).
[0063]
Then, it is checked whether or not the alert action column of the entry of the policy table 46 is specified. If there is no specification, the currently allocated line allocation amount Sum (output IF) is increased by the maximum rate of the second candidate quality QoS2. If the alert action column is updated, the action is executed, and then the line allocation amount Sum (output IF) is increased and updated by the maximum rate of the second candidate quality QoS2 (S24 to S26). This alert action will be described later.
[0064]
As described above, since the second candidate quality QoS2 can be assigned to the traffic to which the first candidate quality QoS1 cannot be assigned, more flexible quality assurance can be performed according to the line state or the like.
[0065]
A PDP server 50 as a policy determination device used in the network together with the packet relay device 30 is configured as shown in FIG.
[0066]
In FIG. 8, the COPS processing unit 51 is for performing communication with the packet relay device 30, and the Adjust reception unit 52 receives the Adjust message from the packet relay device 30.
[0067]
In addition, the reservation reception processing unit 53 determines whether or not the traffic for which an inquiry request has been made via the COPS processing unit 51 is registered in the policy table 54, similarly to the reservation reception processing unit 45 of the packet relay device 30. If registered, a quality parameter that can be assigned to the packet relay device 30 and has a high order is selected and notified to the packet relay device 30.
[0068]
Similarly to the policy table 42 of the packet relay apparatus 30, the policy table 54 stores the latest traffic that can be reserved and a plurality of ranked quality parameters that can be assigned to the traffic in association with each other. .
[0069]
When notified by the reservation reception processing unit 53 that the bandwidth allocation has failed, the alert action execution unit 55 reads the alert type from the policy table 54 and sends the alert type to the processing unit (SNMP Trap or SYSLOG) corresponding to the alert type. Request processing.
[0070]
The SNMP trap generation unit 56 is called from the alert action execution unit 55 and notifies the alert information to a network management node (not shown).
[0071]
The SYSLOG generation unit 57 is called from the alert action execution unit 55 and notifies the alert information to the SYSLOG host (not shown).
[0072]
In response to an inquiry from the PEP (packet relay device 30), the PDP server 50 includes a parameter for the first candidate quality QoS1 or a parameter for the second candidate quality QoS2 in a decision (reply to the inquiry source). A function, a function for executing an alert action directly from the PDP server 50 to a user (network management node or SYSLOG host), and an alert action in the case of a case where the first candidate quality QoS1 cannot be assigned. Has a function to include instructions.
[0073]
Although not shown in FIG. 1, in order to execute the alert action described above in the packet relay device 30, the packet relay device 30 also includes the alert action execution unit 55, the SNMP Trap generation unit 56, and the SYSLOG generation unit 57. The same thing is provided.
[0074]
9 and 10 are flowcharts showing the processing procedure of the PDP server 50. The operation of the PDP server 50 will be described below according to this flowchart.
[0075]
First, when an inquiry by COPS is received from the packet relay device 30, the policy table 54 is searched, and if the inquiry traffic is in the policy table 54, the parameter of the first candidate quality QoS1 is obtained, and the restriction is set at the output port. In the same manner as described above, it is determined whether or not the line has a margin. When the line has a margin, the parameter of the first candidate quality QoS1 is notified to the inquiry packet relay apparatus 30 (S31 to S37).
[0076]
If the inquiry traffic is not in the policy table 54, a signal indicating an error is returned to the inquiry packet relay apparatus 30 and the process ends (S38).
[0077]
Also, if there is no room in the line, it is checked whether there is a designation in the output IF column of the entry in the policy table 54. If there is no designation, the maximum rate column of the second candidate quality QoS2 is examined and designated. If there is, the output IF is substituted into a variable (output IF), and then the maximum rate column of the second candidate quality QoS2 is checked (S39 to S41).
[0078]
If the content of the maximum rate column of the second candidate quality QoS2 is a parameter indicating “discard”, this is notified to the packet relay device 30, and the content of the maximum rate column is a parameter indicating “best effort”. If so, this is notified to the packet relay device 30, and if the content of the maximum rate column is any other value, the parameter of the second candidate quality QoS2 is notified to the inquiry packet relay device 30 to register the traffic flow. Finally, necessary error actions are executed on the server side (S42 to S45).
[0079]
In order to determine whether the PDP server 50 has a sufficient line, the packet relay apparatus 30 as the inquiry source notifies the current line allocation amount and the allowable maximum line amount at the time of inquiry.
[0080]
As shown in FIG. 11, when the Adjust message is received from the packet relay device 30, the first candidate quality QoS1 of all the priority L traffic in the policy table 54 is overwritten with the second candidate quality QoS2, and the COPS- In PR, the contents of the policy table updated by overwriting the packet relay device 30 are downloaded (S51 to S52).
[0081]
The Adjust message has the format shown in FIG. 12, for example, and the policy ID that has failed to be assigned is stored in the “Policy ID” column of the message.
[0082]
The reservation acceptance processing unit 45 of the packet relay apparatus 30 updates the internal policy table 46 with the downloaded policy contents, and changes the guarantee contents of the currently allocated traffic based on the updated policies.
[0083]
As a result of this change, a large margin is created in the line, the traffic flow currently allocated is stably relayed, and a new high-quality traffic reservation can be accepted.
[0084]
Note that the content of the policy table 46 of the packet relay device 30 is downloaded from the PDP server 50 or another device when the system is activated.
[0085]
In the above description, the quality parameters ranked in two stages are set in the policy tables 46 and 55, but the quality parameters may be set in more stages.
[0086]
【The invention's effect】
As described above, in the policy table of the communication quality assignment system of the present invention, the identification information for specifying the source or destination of the traffic that can be reserved and the information that can be assigned to that one traffic are ranked. When there is a reservation request message including identification information for specifying a transmission source or a destination, the identification information included in the reservation request message is stored in the policy table. If it is determined that it is registered in the policy table, among the plurality of quality parameters corresponding to the identification information, it can be assigned to the packet relay device and has the highest rank Traffic for which quality parameters are selected and communication quality determined by the selected quality parameters is requested Since to assign to the packet relay apparatus for relaying, it is possible to flexible quality assurance in accordance with the state of the line.
[Brief description of the drawings]
FIG. 1 is a diagram showing a main configuration of an embodiment of the present invention.
FIG. 2 is a system diagram including an embodiment.
FIG. 3 shows an example of data stored in the main part of the embodiment.
FIG. 4 is an example of data stored in the main part of the embodiment.
FIG. 5 is an example of data stored in the main part of the embodiment.
FIG. 6 is a flowchart for explaining the operation of the embodiment;
FIG. 7 is a flowchart for explaining the operation of the embodiment;
FIG. 8 is a diagram showing the configuration of a PDP server
FIG. 9 is a flowchart for explaining the operation of the PDP server.
FIG. 10 is a flowchart for explaining the operation of the PDP server.
FIG. 11 is a flowchart for explaining the operation of the PDP server.
FIG. 12 is a message format diagram.
FIG. 13 is a diagram for explaining the operation of a conventional system.
FIG. 14 is a diagram for explaining the operation of a conventional system.
FIG. 15 is a conventional policy table diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sending node, 2 ... Receiving node, 30 ... Packet relay apparatus, 31 ... Network processor, 32 ... Packet classifier, 33 ... Flow management database, 34 ... Flow table, 35 ... Traffic manager , 36 ... buffer, 37 ... packet scheduler, 38 ... traffic management database, 40 ... PSVP processing unit, 41 ... routing processing unit, 42 ... routing table, 45 ... reservation acceptance processing unit, 46 ... Policy table 47... COPS processor 50... PDP server 51. COPS processor 52. Adjust acceptor 53. Reservation acceptor 54. Policy table Alert action executing unit 56 …… SNMP Trap generator, 57 …… SYSLOG generator

Claims (7)

Communication quality assignment for assigning packet communication quality by the packet relay device of the computer network that relays the packet via the packet relay device (30) based on the contents registered in advance in the policy table (46, 54) In the system,
In the policy table, identification information for identifying a source or destination of traffic that can be reserved and a plurality of ranked quality parameters that can be assigned to the single traffic are registered in association with each other in advance. Configuration
When there is a reservation request message including identification information for specifying a transmission source or a destination, determination means (45, 53) for determining whether or not the identification information included in the reservation request message is registered in the policy table )When,
When it is determined that the identification information included in the reservation request message is registered in the policy table, among the plurality of quality parameters corresponding to the identification information, it can be assigned to the packet relay apparatus and has the highest rank. Selection means (45, 53) for selecting high quality parameters,
A communication quality assignment system, wherein communication quality determined by a quality parameter selected by the selection means is assigned to a packet relay device that relays the traffic requested for reservation. 2. The communication quality assignment system according to claim 1, wherein the policy table, determination means, and selection means are provided in the packet relay apparatus. The policy table, determination means, and selection means are provided in a policy determination device (50) capable of communicating with the packet relay device,
The policy judgment device receives a request from the packet relay device, performs the judgment processing by the judgment unit and the selection processing by the selection unit, and notifies the packet relay device of the selected quality parameter. The communication quality allocation system according to claim 1. 2. The packet relay apparatus discards a packet of requested traffic when a parameter for instructing packet discard is included in a low-order quality parameter selected by the selecting means. The communication quality allocation system according to any one of? The policy table includes, in advance, identification information that identifies a source or destination of traffic that can be reserved, a plurality of quality parameters that can be assigned to the single traffic, and specific parameters. It is a configuration that is registered in association with,
The communication quality assignment system according to any one of claims 1 to 3, wherein when a low-order quality parameter is selected by the selection unit, an alert process corresponding to the specific parameter is executed. The policy table includes, in advance, identification information that identifies a source or destination of traffic that can be reserved, a plurality of quality parameters that can be assigned to the single traffic, and specific parameters. It is a configuration that is registered in association with,
When a low-order quality parameter is selected by the selection means, an update means (45,) that updates the contents of the policy table so as to increase the rank of the selected quality parameter corresponding to the specific parameter. 52) The communication quality assignment system according to any one of claims 1 to 3, further comprising: 52). Monitoring means (35) for monitoring the use state of the line;
The communication quality assignment system according to any one of claims 1 to 3, further comprising update means (45, 52) for updating contents of the policy table based on a monitoring result of the monitoring means.

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