JP2005020602A - Routing control method, data gathering apparatus, and routing control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a processing time for advertising routing information and to suppress consumption of a memory capacity. <P>SOLUTION: When detecting disabled arrival of routing information, an information discrimination section 13e discriminates it to be abnormality of a transmission topology, instructs an interface section 13a to carry out transmission processing of a withdrawal message and gives an instruction to a database read control section 13b to set a delete flag. The database read control section 13b sets the delete flag in the routing information corresponding to the database read control section 13b in response to this instruction. Further, when the information discrimination section 13e again receives the routing information within a prescribed time, deletes the delete flag set in the routing information, so as to attain the reuse of the routing information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a route control method using a connection-oriented route exchange protocol capable of ensuring redundancy as a routing control function, for example, IBGP (Internal Border Gateway Protocol: RFC1966), and its data aggregation device And a routing system.
[0002]
[Prior art]
In the recent BGP deployment on the Internet, all IBGP routers belonging to an AS (Autonomous System) are set so that route information received from the IBGP router should not be transmitted to other IBGP routers. It is set so that it must be connected by a mesh, and external route information must be distributed to all other routers belonging to this AS. For example, if there are N IBGP routers in the AS, N (N-1) / 2 unique IBGP sessions must be maintained, so the number of connections increases and route information is transmitted. The transmission traffic on the backbone network due to the network has increased, and connection management has become complicated. The AS is a range that is managed and operated by a single management entity under a single route control policy. For example, an ISP (Internet Service Provider) corresponds to this AS.
[0003]
In order to solve such problems and reduce the connection with the full mesh, conventionally, a route reflector device (hereinafter referred to as “RR device”) that is a data aggregating device that aggregates and relays route information in the AS. There are some that use 11. This RR device exchanges route information with IBGP routers and IBGP peers based on the setting information input from the center station 30, for example, and holds this route information database for data communication. I have to. For example, as shown in the system configuration diagram of FIG. 7, an RR device 11 is provided on the AS backbone network 10. In this system, a connection is established between the RR device 11 and each of the IBGP routers (hereinafter referred to as “RTR”) 21 to 24 through a transmission line, and route information is exchanged through the transmission line. Is going. As shown in FIG. 7, the RR device 11 has a reception route database 13c and a transmission route database 13d corresponding to each IBGP router, and receives the received route information (in the embodiment, routes 1 to 1 million). The route information is aggregated and registered in the route database 13c, and this route information is copied by the number of each RTR 21-24 of the transmission partner and stored in each transmission route database 13d, and then the route information is transmitted to the RTRs 21-24. Yes.
[0004]
In such a system, for example, when the failure of the RTR 21 or the occurrence of a failure of the RTR in another AS connected to the RTR 21 is detected, a state in which path information cannot be exchanged between the RR device 11 and the RTR 21 may occur. A delete (WITHDRAW) message will be transmitted. In response to such a situation, the RR device 11 performs the processes shown in FIGS.
[0005]
That is, as shown in the flowchart of FIG. 9, the RR device 11 exchanges route information with each of the RTRs 21 to 24, and creates each reception route database 13c and each transmission route database 13d based on the received route information. (Step 101). When a message is received from the RTR 21 (step 102), it is determined whether this message is an update message for adding a route or a delete message for deleting a route (step 103).
[0006]
Here, when the received message is an update message, route addition processing for registering route information in the reception route database 13c and the transmission route database 13d is performed (step 104), and when the received message is a deletion message. As shown in FIG. 8, a route addition process for deleting the corresponding route information (in this example, information on route 6) from the reception route database 13c and the transmission route database 13d is performed (step 105), and further updated transmission is performed. A message transmission process for transmitting an update / deletion message for transmitting the contents of the route database to the other RTRs 22 to 24 to the other RTRs 22 to 24 is performed (step 106).
[0007]
In this system, when the route information exchanged by the IBGP peer increases, the amount of communication data for route change processing and route change notification in another IBGP router caused by a failure of a certain IBGP router increases. For this reason, conventionally, after the RR device 11 receives a deletion message indicating a route change notification, the transmission state is monitored for a certain period of time, and only when this deletion message continues, the deletion message is transmitted to other IBGP routers. Some have used a route flap dampening technique.
[0008]
[Patent Document 1]
JP-A-11-168492
[Problems to be solved by the invention]
However, the above-described conventional example has a problem that it cannot be applied when the partner IBGP router that performs direct communication fails. That is, when the IBGP router 21 fails, the route information received from the router 21 is re-advertised to the other IBGP routers 22 to 24. In the conventional example shown in FIG. Since the router 21 advertises 1 million routes, it is necessary to reprocess and readvertise (reception route 1 million) × (number 3 of other IBGP routers 22 to 24) = 3 million routes. For this reason, the RR device has a problem in that a process that consumes a large amount of processing time and memory capacity is required to advertise the route information.
[0010]
The present invention has been made in view of the above problems, and provides a route control method, a data aggregation device, and a route control system capable of reducing processing time for advertising route information and suppressing consumption of memory capacity. The purpose is to provide.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the route control method according to claim 1, a session is established by establishing a connection with each different data relay device using a connection type communication route exchange protocol, and route information is exchanged. In the route control method for registering the exchanged route information in a database, when deleting predetermined route information of the route information, a transmission processing step of executing a deletion message transmission processing, and receiving of the database A flag for deletion is set in the predetermined route information in the side database, the route information is set to an unused state, and the predetermined route information is re-received when the route information after the setting is exchanged The route control step of deleting the deletion flag and setting the predetermined route information to an available state; When the delete flag is deleted, the path control method comprising a transmission cancellation process for canceling the transmission processing of the deletion message is provided.
[0012]
According to the present invention, for example, when predetermined route information of route information is deleted due to a change in transmission topology or the like, a deletion flag is set and the route information is set to an unused state, and then the route information is changed. When it is received again, the deletion flag that has been set is deleted, and the deletion message transmission process is canceled to shorten the processing time for advertising the route information, and the memory capacity associated with the creation of the deletion message is reduced. Reduce consumption.
[0013]
The route control method according to claim 2 further includes a detection step of detecting an abnormality in a transmission topology, and the route control step includes a step in the reception-side database corresponding to the transmission topology detected in the detection step. A deletion flag is set on the predetermined route information.
[0014]
According to the present invention, for example, a transmission topology abnormality is detected because there is no transmission of route information from a data relay device of a path exchange partner, and a deletion flag is set in the route information corresponding to this transmission topology. Then, waiting for the recovery of the data relay device, and when the route information can be received by this recovery, the deletion flag set up is deleted and the deletion message transmission process is canceled to advertise the route information. The processing time is shortened, and the memory capacity consumption associated with the creation of the deletion message is suppressed.
[0015]
Further, in the route control method according to claim 3, in the route control step, when re-reception of the route information with the deletion flag set within a predetermined time, the deletion flag is deleted, When the route information is set to the usable state and the route information with the deletion flag set is not re-received within the predetermined time, the route information registered in the database is deleted. Features.
[0016]
According to the present invention, for example, when the corresponding route information is re-received within a predetermined time after the deletion flag is set, it is determined that the transmission topology is restored, and the deletion flag is deleted. When the corresponding route information is not re-received within a certain period of time, it is determined that the transmission topology has been changed, and the processing time for advertising the route information by deleting the route information registered in the database Can be shortened.
[0017]
The data aggregation device according to claim 4 establishes a session by establishing a connection with each different data relay device using a connection type communication route exchange protocol, and exchanges route information. In a data aggregating apparatus having a database for registering exchanged route information, when deleting predetermined route information of the route information, a transmission processing means for executing transmission processing of a deletion message, A deletion flag is set on the predetermined route information in the reception side database, the route information is set to an unused state, and when the route information is exchanged after the setting, the predetermined route information is restored. When received, the route control unit deletes the deletion flag and sets the predetermined route information to an available state. If, when the deletion flag is deleted, the data aggregation device is provided which is characterized in that a transmission canceling means for canceling the transmission processing of the deletion message.
[0018]
According to the present invention, for example, when the predetermined route information of the route information is deleted due to a change in the transmission topology or the like, the deletion flag is set by the route control means, and the predetermined route information registered in the database is invalidated. In the use state, the transmission processing unit performs the deletion message transmission process, and when the route information is received again, the deletion flag is deleted and the deletion message transmission process is canceled by the transmission cancellation unit. As a result, the processing time for advertising the route information is shortened, and the consumption of memory capacity associated with the creation of the deletion message is suppressed.
[0019]
The data aggregation device according to claim 5 further comprises detection means for detecting an abnormality in a transmission topology, wherein the path control means corresponds to the transmission topology detected by the detection means in the reception side database. A deletion flag is set on the predetermined route information.
[0020]
According to the present invention, for example, based on the absence of transmission of route information from the data relay device of the path exchange partner, an abnormality in the transmission topology is detected by the detection means, and a route corresponding to this transmission topology is detected by the route control means. By setting a deletion flag in the information, the recovery of the data relay device is awaited. When the route information can be received by this recovery, the deletion flag is deleted and the transmission canceling means transmits the deletion message. By canceling, the processing time for advertising the route information is shortened, and the consumption of memory capacity associated with the creation of the deletion message is suppressed.
[0021]
Further, in the data aggregating apparatus according to claim 6, the route control means deletes the deletion flag and deletes the deletion flag when the route information with the deletion flag set is re-received within a predetermined time. The information is set in a usable state, and the route information registered in the database is deleted when re-reception of the route information with the deletion flag set is not performed within the predetermined time. To do.
[0022]
According to the present invention, for example, when re-reception of the corresponding route information is performed within a predetermined time by the route exchange unit after the route control unit sets the deletion flag, it is determined that the transmission topology is restored and the route is restored. The control means deletes the deletion flag, and if the corresponding route information is not re-received within a certain time, it is determined that the transmission topology has been changed, and the route control means is registered in the database. By deleting the route information, the processing time for advertising the route information is shortened.
[0023]
Further, in the route control system according to claim 7, in the route control system for exchanging route information, the exchanged route information is registered, and the data relay device that relays data based on the route information; A route control system comprising: the data aggregating device according to any one of claims 4 to 6; and a registration change of a database in which the route information is registered according to a change in transmission topology. Provided.
[0024]
According to the present invention, for example, when predetermined route information is deleted in accordance with a change in transmission topology, the route information in the database remains registered, and a deletion flag is set on this route information to maintain a certain level. When the route information is not re-received after a time, the processing time for advertising the route information is shortened, and the consumption of memory capacity associated with the creation of the deletion message is suppressed.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a route control method, a data aggregation device, and a route control system according to the present invention will be described below with reference to the accompanying drawings of FIGS. The configuration of the routing control system according to the present invention is the same as the configuration shown in FIG. 6. In the following diagram, the same components as those in FIG. Shall be appended.
[0026]
(Embodiment)
FIG. 1 is a schematic configuration diagram showing a schematic configuration of an RR apparatus according to the present invention. In FIG. 1, for example, setting information including a command such as a transmission topology change from the center station 30 is received and a setting processing unit 12 for notifying the setting information is received. An update / deletion message and exchange of route information with a certain RTR 21 to 24, and registration / deletion of the received route information in the route information databases 13c and 13d, and an optimum from the IBGP processing unit 13 The relay processing unit 14 takes in route information and registers it in the route information database 14a. The setting information can also be input directly to the RR apparatus using an input means such as a keyboard.
[0027]
As shown in FIG. 2, the IBGP processing unit 13 includes an interface unit 13 a connected to the network 10 and the setting processing unit 12, and a database read control unit 13 b that controls reading of route information taken from an IBGP peer on the network 10. And a path information database on the receiving side (hereinafter referred to as “reception path database”) 13c for storing received path information and a path information database on the transmitting side (hereinafter referred to as “transmission path database”) by the reading control of the database read control unit 13b. 13d) and an information discriminating unit 13e for discriminating information fetched from the setting processing unit 12 and the RTRs 21 to 24.
[0028]
The information discriminating unit 13e discriminates the input setting information and message, and the reception status of the route information, etc., and receives the route information according to the addition / deletion messages received from the RTRs 21 to 24 and the transmission information. An instruction is given to add / delete the route databases 13c and 13d. Further, when the route information from the RTRs 21 to 24 is not received, the information determination unit 13e determines that a failure has occurred, and performs processing for deleting the corresponding route information from the reception route and transmission route databases 13c and 13d. An instruction is given to the database read control unit 13b.
[0029]
The reception route database 13c and the transmission route database 13d are configured as shown in FIGS. 3 and 4, and the difference from FIGS. 7 and 8 corresponds to the information of the routes 1 to 1 million in the reception route database 13c. Thus, the same route information is received within a certain predetermined time without deleting the point where the erase flag indicating the status of the route information is set and the route information for which the erase flag is set. Then, the deletion message transmission process is set to be canceled.
[0030]
That is, in this embodiment, when a failure occurs in the RTR 21 and the route information cannot be received, the information determination unit 13e gives an instruction to delete the corresponding route information to the database read control unit 13b and the interface unit 13a. Is given instructions for creating and sending a delete message. In response to this instruction, the database read control unit 13b sets an erasure flag for the corresponding route information and sets the reception route database 13c to a non-useable state where the search is not possible. The interface unit 13a creates a deletion message, Execute the transmission process.
[0031]
Then, the database read control unit 13b receives the route information within a predetermined fixed time, and when the route information matches the route information registered in the reception route database 13c, the database read control unit 13b The erase flag that has been raised is deleted, and the route information is set to a usable state in which it can be searched. In addition, when the matched route information is not received within the predetermined time, the database read control unit 13b displays the route information registered in the reception route database 13c and the transmission route database 13d as shown in FIG. In addition to deleting, the deletion flag corresponding to the route information is also deleted.
[0032]
Next, based on the flowchart of FIG. 5, the processing operation at the time of route addition / deletion will be described. In FIG. 5, the information discriminating unit 13e first determines whether or not the route information is received by the interface unit 13a (step 201). When the route information is received, the message is updated to indicate that the route information is added next. It is determined whether it is a message or a deletion message indicating deletion of route information (step 202).
[0033]
Here, when the received message is the addition of route information, the database read control unit 13b registers the corresponding route information in the reception route database 13c and the transmission route database 13d according to an instruction from the information determination unit 13e. At the same time (step 203), the interface unit 13a creates an update message according to an instruction from the information discriminating unit 13e, and transmits it to the RTR of the IBGP peer other than the RTR that is the transmission source of this route information (step 204). , Wait for reception of the next route information.
[0034]
Further, when the received message is the deletion of the route information, the database read control unit 13b also sets an erasure flag on the corresponding route information in the reception route database 13c according to the instruction of the information determination unit 13e ( Step 205), the interface unit 13a creates a deletion message and starts its transmission process (Step 206).
[0035]
Next, the information determination unit 13e determines whether the same route information as the route information for which the erasure flag is set is received by the interface unit 13a (step 207). Here, there is no reception of the corresponding route information, for example, it is determined whether or not a certain time has elapsed since the flag was turned off (step 208). If a predetermined time has elapsed, the corresponding route information is deleted from the databases 13c and 13d (step 209).
[0036]
In step 207, when the same route information as the route information for which the deletion flag is set is received by the interface unit 13a, it is determined whether or not the deletion message created by the interface unit 13a has been transmitted (step 210). .
[0037]
If the delete message has not been transmitted, the transmission of the delete message created by the interface unit 13a is canceled (step 211). If the delete message has already been transmitted, the interface unit 13a An additional message is transmitted to the RTRs 22 to 24 (step 212), and the process returns to step 201.
[0038]
As described above, in this embodiment, when the route information cannot be exchanged due to a failure of the RTR or when the RTR interrupts the route exchange due to maintenance, the RR device cannot receive the route information. When the predetermined route information is deleted, an erase flag is set to the predetermined route information in the reception route database, the route information is set to an unused state, and then the predetermined route information is received again within a predetermined time. Then, the deletion flag is deleted so that the predetermined route information can be used, and the deletion message transmission processing is canceled, so that the processing time for advertising the route information can be shortened and the route information within a certain time. When the message is received again, the deletion message transmission process is canceled, so that the consumption of the large amount of memory used to create the deletion message is reduced. It is possible to re-use of Rutotomoni route information.
[0039]
The present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.
[0040]
【The invention's effect】
As described above, in the present invention, when deleting predetermined route information of route information, a deletion flag is set, and when the route information is received again, the deletion flag is deleted, Since the deletion message transmission processing is canceled, the processing time for advertising the route information can be shortened, and the memory capacity consumption associated with the creation of the deletion message can be suppressed.
[0041]
Further, in the present invention, a deletion flag is set in the route information corresponding to the transmission topology in which the abnormality is detected, and the deletion of the route information is waited for a certain time, so that the processing time for advertising the route information can be shortened.
[0042]
Further, in the present invention, when the corresponding route information is re-received within a predetermined time, the deletion flag set in the route information is deleted, and when this re-reception is not performed, it is registered in the database. Since the route information is deleted, the processing time for advertising the route information can be shortened.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a schematic configuration of a route reflector device according to the present invention.
2 is a configuration diagram illustrating a configuration of an IBGP processing unit illustrated in FIG. 1;
3 is a configuration diagram showing a configuration of a database for registering the route information shown in FIG. 1. FIG.
4 is a configuration diagram showing the configuration of a database for explaining a case where route information is deleted, as in FIG. 3;
5 is a flowchart for explaining a processing operation when a route is added / deleted by the RR device shown in FIG. 1; FIG.
FIG. 6 is a configuration diagram showing a configuration of a path control system.
FIG. 7 is a configuration diagram showing a configuration of a database for registering conventional route information.
FIG. 8 is a configuration diagram showing the configuration of a database for explaining a case where route information is deleted, as in FIG. 7;
FIG. 9 is a flowchart for explaining a processing operation when a conventional RR device adds / deletes a route;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Backbone network 11 Route reflector (RR) apparatus 12 Setting process part 13 IGBT processing part 13a Interface part 13b Database reading control part 13c Reception path database 13d Transmission path database 13e Information discrimination | determination part 14 Relay processing part 14a Path information database 21-24 Router (RTR)
30 Center station

Claims (7)

In a route control method for establishing a session by establishing a connection with each different data relay device using a connection type communication route exchange protocol, exchanging route information, and registering the exchanged route information in a database.
A transmission process step of executing a deletion message transmission process when deleting predetermined path information of the path information;
Among the databases, a flag for deletion is set on the predetermined route information in the reception side database, the route information is set to an unused state, and the route information is exchanged after the setting. When the route information is re-received, the route control step of deleting the deletion flag and setting the predetermined route information to an available state;
When the deletion flag is deleted, a transmission cancellation step of canceling the transmission process of the deletion message,
A path control method comprising: The path control method further includes a detection step of detecting an abnormality in the transmission topology,
The route control according to claim 1, wherein in the route control step, a deletion flag is set in the predetermined route information in the receiving database corresponding to the transmission topology detected in the detection step. Method. In the route control step, when re-reception of the route information with the deletion flag set within a predetermined time, the deletion flag is deleted and the route information is set to an available state. 3. The route control according to claim 1, wherein the route information registered in the database is deleted when re-reception of the route information with the deletion flag set is not performed within a predetermined time. Method. Data having path exchange means for establishing a session by exchanging connections with different data relay apparatuses using a path exchange protocol for connection type communication and exchanging path information, and a database for registering the exchanged path information In the aggregation device,
A transmission processing unit that executes transmission processing of a deletion message when deleting predetermined route information of the route information;
Among the databases, a flag for deletion is set on the predetermined route information in the reception side database, the route information is set to an unused state, and the route information is exchanged after the setting. When the route information is re-received, the route control means for deleting the deletion flag and setting the predetermined route information in an available state;
When the deletion flag is deleted, transmission cancellation means for canceling the transmission process of the deletion message,
A data aggregating apparatus comprising: The data aggregating apparatus further comprises detection means for detecting a transmission topology abnormality,
5. The data aggregation according to claim 4, wherein the route control unit sets a deletion flag in the predetermined route information in the reception-side database corresponding to the transmission topology detected by the detection unit. apparatus. The route control means deletes the deletion flag and sets the route information to an available state when the route information with the deletion flag raised is re-received within a predetermined time. 6. The data aggregating apparatus according to claim 4 or 5, wherein the route information registered in the database is deleted when re-reception of the route information for which the deletion flag is set is not performed in time. . In a route control system that exchanges route information,
A data relay device that registers the exchanged route information and relays data based on the route information;
The data aggregation device according to any one of claims 4 to 6,
A routing control system comprising: changing a registration of a database in which the routing information is registered according to a change in transmission topology.

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