JP2001320409A - Network and band warrant method used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network that reserves a frequency band for an IP packet, dynamically controls the frequency band and can improve reliability of information transfer of a real time application or the like. SOLUTION: A design server 1 estimates a frequency band or the like required for packets with protocols other than the RSVP(Resource Reservation Protocol) and stores the result to a database 4. A provisioning type policy server 2 reads band/control information of packets with protocols other than the RSVP from the database 4, and sets band/control information as to the packets with protocols other than the RSVP to edge routers 5, 6 and core routers 7, 8 by using routing information 201. A signaling type policy server 3 reads and keeps the band/control information as to RSVP packets from the database 4 in advance and sets the band/control information as to the RSVP to the edge routers 5, 6 by using RSVP control information 301.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network and a bandwidth guarantee method used for the same, and more particularly, to an IP (Internet).
net protocol) regarding bandwidth guarantee in a network.

[0002]

2. Description of the Related Art Conventionally, in an IP network, T
CP / IP (Transmission Control)
l Protocol / Internet Proto
col) is used for a wide area commercial packet switching network and the Internet. These networks, such as the Internet, are of a best-effort type with no bandwidth guarantee.

[0003] Here, the best-effort service is a type of service that does not guarantee the transmission band of communication that can be used by the user when the network is congested, and reduces the communication fee instead of guaranteeing the transmission band. A communication method using a statistical multiplexing method that is easily affected by traffic of other users, such as packet multiplexing on the Internet, is called a best-effort type because there is no guarantee of a band.

[0004]

The above-mentioned conventional networks such as the Internet are of the best-effort type, and do not take into account the guarantee of bandwidth and the dynamic securing of resources. There is a problem that the speed is reduced and the quality is reduced.

Accordingly, an object of the present invention is to solve the above-mentioned problems, to secure a band for an IP packet, to dynamically control a band, and to secure information transfer of a real-time type application or the like. An object of the present invention is to provide a network capable of improving the performance and a bandwidth guarantee method used for the network.

[0006]

A network according to the present invention is a network including a terminal edge router connectable to another network and a core router for connection only within its own network.
(Resource reservationprot
ocol), a first server that sets control information including information on a band used by a packet other than the ocol) in the edge router and the core router, and information on a band used by the RSVP packet in response to an inquiry from the edge router. And a second server that returns a response to the edge router based on the control information including the control information.
It operates on packets other than SVP.

[0007] A bandwidth guarantee method according to the present invention is a bandwidth guarantee method for a network including a terminal edge router connectable to another network and a core router for connection only within its own network.
(Resource reservation pro
setting, from the first server, control information including information on a band used by a packet other than a packet other than a tocol) to the edge router and the core router; and setting of the band used by the RSVP packet in response to an inquiry from the edge router. Returning a response from the second server to the edge router based on the control information including the information,
The edge router and the core router operate on packets other than the RSVP according to the control information prepared and set.

That is, the network according to the present invention comprises:
RSVP (resource reservation)
protocol) and network using RS
An object of the present invention is to provide a configuration for simultaneously realizing a bandwidth guarantee for a network other than the VP.

More specifically, in the network according to the present invention, the bandwidth used by the packet other than the RSVP is estimated in consideration of the bandwidth used by the design server in the RSVP, control information is generated, and the result is stored in a database. Store.

[0010] The provisioning type policy server that prepares for the setting of the router reads out the band / control information on the packets other than the RSVP from the database, and sets the band / control information in the edge router or the core router. Here, the edge router is a router on the terminal side that can be connected to another network, and the core router is a router for connection only within the network.

The edge router and the core router perform RSV according to the provisioned (setting preparation) control information.
It operates on packets other than P. The above-described operations of the design server, the provisioning policy server, the edge router, and the core router make it possible to guarantee the bandwidth of packets other than RSVP.

Further, in the network according to the present invention, the signaling type policy server responding to the inquiry from the router uses the bandwidth / RSVP packet bandwidth.
The control information is read from the database in advance and held.

When an edge router on one end receives a PATH (path setting) message for setting a path to a connection destination from another network, the signaling type policy server determines whether or not the message sender can use the RSVP service. Contact In response to the inquiry from the edge router on one end, the signaling type policy server checks the control information on the held RSVP packet, and transmits the result of the availability of the RSVP service to the edge router on one end. When the RSVP service is available, the edge router on one end transfers a PATH message, and sets a path state for each of the core router on the route and the edge router on the other end.

When the edge router at the other end receives a RESV (reserve) (bandwidth confirmation) message for confirming bandwidth reservation from another network as a response signal to the PATH message, it provides the requested bandwidth. Query the signaling policy server if there are enough resources on the node.

The signaling type policy server determines whether the requested bandwidth can be secured and transmits the result to the edge router on the other end. When the edge router on the other end can secure the bandwidth, it transfers the RESV message and secures the resources of each core router on the path and the edge router on one end.

The operation of the signaling type policy server and the edge router makes it possible to guarantee the bandwidth for the RSVP packet. This gives R
It is possible to simultaneously perform a service that guarantees the bandwidth for both the SVP packet and the packet other than the RSVP.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a network according to an embodiment of the present invention. Referring to FIG. 1, a network according to an embodiment of the present invention includes a design server (DS) 1, a provisioning type policy server (P-PS) 2, and a signaling type policy server (S).
-PS) 3, a database (DB) 4, edge routers (ER) 5 and 6 on the IP network 10, and core routers (CR) 7 to 9 in the IP network 10.

The design server 1 is an RSVP (resource)
The required bandwidth and the like of packets other than the e.reservation protocol are estimated and stored in the database 4. That is, the database 4 stores data used by the provisioning type policy server 2 and the signaling type policy server 3.

The provisioning type policy server 2 is a server that prepares settings for routers, reads out bandwidth / control information on packets other than RSVP from the database 4, and uses the routing information 201 to store the edge routers 5 and 6 and the core routers 7 and 8 respectively. The bandwidth / control information for the packet other than the RSVP is set in.

Here, the edge routers 5 and 6 are terminal routers that can be connected to another network (not shown), and the core routers 7 to 9 are routers for connection within the IP network 10 only.

The signaling type policy server 3 is a server that responds to an inquiry from a router.
The bandwidth / control information for the SVP packet is read from the database 4 in advance and held, and the bandwidth / control information for the RSVP is set in the edge routers 5, 6 by the RSVP control information 301.

Thus, the RSV is transmitted from the edge router 5 to the edge router 6 via the core routers 7 and 8.
Path 101 available for P and path 102 other than RSVP
Is set.

FIGS. 2 and 3 are block diagrams showing processing operations in a network according to an embodiment of the present invention.
A processing operation in the network according to the embodiment of the present invention will be described with reference to FIGS.

The design server 1 estimates the bandwidth used by packets other than the RSVP in consideration of the bandwidth used in RSVP, generates control information, and stores the result in the database 4 (step S1 in FIG. 2).

The provisioning type policy server 2 uses R
The bandwidth / control information for packets other than SVP is read from the database 4, and the bandwidth / control information is set in the edge routers 5, 6 and the core routers 7 to 9 (step S2 in FIG. 2).

Edge routers 5, 6 and core routers 7-9
Operates on packets other than RSVP in accordance with the provisioned control information (setting preparation) (FIG. 2).
Step S3). Through the above-described processing operation, it is possible to guarantee the bandwidth for packets other than RSVP.

On the other hand, the signaling type policy server 3 reads out the band / control information on the RSVP packet from the database 4 in advance and holds it (step S1 in FIG. 3).
1). When the edge router 5 receives a PATH (path setting) message for setting a path to a connection destination from another network (not shown) outside the IP network 10, whether or not the message sender can use the RSVP service An inquiry is made to the signaling type policy server 3 as to whether or not it is (step S12 in FIG. 3).

The signaling type policy server 3 responds to the inquiry from the edge router 5 by holding the RS
The control information about the VP packet is confirmed, and the result of the availability of the RSVP service is transmitted to the edge router 5 (step S13 in FIG. 3).

When the RSVP service is available, the edge router 5 transfers the PATH message and sets the path status to each of the core routers 7, 8 and the edge router 6 on the route (step S14 in FIG. 3).

When the edge router 6 receives, from another network (not shown) outside the IP network 10, a response signal to the PATH message and a RESV (reserve) (bandwidth confirmation) message for confirming the bandwidth reservation. Query the signaling-type policy server 3 whether the node has sufficient resources to provide the requested bandwidth (step S1 in FIG. 3).
5).

The signaling type policy server 3 determines whether the requested bandwidth can be secured, and sends the result to the edge router 6 (step S16 in FIG. 3).
When the bandwidth can be secured, the edge router 6 transfers the RESV message and secures the resources of the core routers 7, 8 and the edge router 5 on the path (step S1 in FIG. 3).
7).

By the above-described processing operation, the bandwidth can be guaranteed for the RSVP packet. As a result, it is possible to perform a service that guarantees the bandwidth for both the RSVP packet and the packet other than the RSVP at the same time.

FIG. 4 is a diagram showing an operation at the time of accepting a service in the network according to one embodiment of the present invention.
Is a PAT in a network according to one embodiment of the present invention.
It is a figure showing operation at the time of H message arrival. FIG.
Is a RES in a network according to one embodiment of the present invention.
FIG. 7 is a diagram illustrating an operation when a V message arrives, FIG. 7 is a diagram illustrating an operation when normal data is transmitted in a network according to an embodiment of the present invention, and FIG. 8 is a diagram other than RSVP in a network according to an embodiment of the present invention; FIG. 5 is a diagram showing an operation at the time of packet transmission. The processing operation in the network according to one embodiment of the present invention will be described with reference to FIGS.

Hereinafter, the operation of the network according to the embodiment of the present invention will be described by dividing it into "operation at the time of accepting a service", "operation relating to RSVP", and "operation relating to other than RSVP".

First, in the case of "operation at the time of service reception",
The bandwidth used for each of the RSVP packet and the packet other than the RSVP is estimated using the design server 1 and stored in the database 4. The provisioning type policy server 2 acquires the bandwidth / control information from the database 4 and sets the bandwidth / control information in the edge routers 5 and 6 and the core routers 7 and 8 based on the routing information 201. By this, RSVP
A path is set for packets other than (see FIG. 4).

In the case of “operation regarding RSVP”, when a PATH message arrives at the edge router 5 from outside the IP network 10, the edge router 5 informs the signaling type policy server 3 whether the message sender can use the RSVP service. Ask if it is. If usable, the PATH message is transferred to the edge router 6 (see FIG. 5).

Further, RES from outside the IP network 10
When the V message arrives at the edge router 6, the edge router 6 makes an inquiry to the signaling type policy server 3 about a band which can be currently set. When the bandwidth can be secured, the RESV message is transferred to the edge router 5 and the bandwidth reservation state is set in each of the core routers 7 and 8 on the route (see FIG. 6).

The normal RSVP message is classified in the edge router 5 so as to pass through the RSVP path 101, and no inquiry is made to the signaling type policy server 3 and the provisioning type policy server 2 (see FIG. 7).

"Operation for Packets Other than RSVP"
In the case of, data other than the RSVP is normally classified so as to pass through a dedicated path (path 102 other than the RSVP) in the edge router 5.

That is, if the edge router 5 is RSVP data, the edge router 5 transmits the data to a path 10 that can be used for RSVP.
1 and if the data is other than RSVP, the data is sent to a path 102 other than RSVP (see FIG. 8).

As described above, by performing the above-described processing operation, it is possible to secure a band for an IP packet. Further, the bandwidth can be dynamically controlled by using RSVP. Therefore, it is possible to improve the reliability of information transfer of a real-time application such as a voice / image.

In the embodiment of the present invention, the route is designed using the design server 1 and the result is stored in the database 4. However, the user can use the route to the database 4 without using the design server 1. Information may be input directly.

Further, a user may directly input information to the provisioning type policy server 2 and the signaling type policy server 3 without using the design server 1 and the database 4.

Further, in the embodiment of the present invention, an example in which two edge routers 5 and 6 and three core routers 7 to 9 are described, but the number of edge routers and core routers is not limited.

[0045]

As described above, according to the present invention, a terminal edge router connectable to another network,
In a network including a core router for connection only within its own network, control information including at least information on a band used by a packet other than RSVP is set from the first server to the edge router and the core router, and an inquiry from the edge router is made. The second server returns a response to the edge router based on the control information including the information on the band used by the RSVP packet with respect to the edge router, and the edge router and the core router respond to the packet other than the RSVP according to the prepared control information. By operating, it is possible to secure the band for the IP packet, dynamically control the band, and improve the reliability of information transfer of a real-time application or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a network according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a processing operation in a network according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a processing operation in a network according to an embodiment of the present invention.

FIG. 4 is a diagram showing an operation at the time of receiving a service in a network according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating an operation when a PATH message arrives in a network according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an operation when a RESV message arrives in a network according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating an operation during normal data transmission in a network according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating an operation of transmitting a packet other than RSVP in a network according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Design server 2 Provisioning type policy server 3 Signaling type policy server 4 Database 5, 6 Edge router 7-9 Core router 10 IP network 101 Path available for RSVP 102 Path other than RSVP 201 Routing information 301 RSVP control information

Claims (12)

[Claims] 1. A network including a terminal edge router connectable to another network and a core router for connection only within its own network, wherein at least an RSVP (resource reservation) is provided.
a first server that sets control information including information on a band used by a packet other than a protocol (protocol) in the edge router and the core router; and information on a band used by the RSVP packet in response to an inquiry from the edge router. A second server that returns a response to the edge router based on the control information including the second server, wherein the edge router and the core router operate on packets other than the RSVP according to the control information prepared and set. Features network. 2. The server according to claim 1, wherein the first server is a provisioning-type policy server that prepares settings for a router, and the second server is a signaling-type policy server that responds to an inquiry from the router. The network of claim 1, wherein: 3. A database for storing control information generated by estimating a bandwidth used by a packet other than the RSVP in consideration of a bandwidth used in the RSVP. 2. The network according to 2. 4. A design server for estimating a band used by a packet other than the RSVP in consideration of a band used in the RSVP, generating control information, and storing the control information in the database. 3. The network according to 3. 5. The edge router, upon receiving a path setting message for setting a path to a connection destination, notifies the second server whether or not the sender of the path setting message can use the RSVP service. Inquiry, The second server confirms control information about the RSVP packet in response to an inquiry from the edge router, and transmits a result of availability of the RSVP service to the edge router, The edge router includes: 5. The method according to claim 1, wherein the path setting message is transferred if the RSVP service is available, and a path state is set to each of a core router and an edge router on a route. Network. 6. When the edge router receives a response signal to the path setup message and a bandwidth confirmation message for confirming a bandwidth reservation, the node has sufficient resources in the node to provide the requested bandwidth. The second server determines whether or not the requested bandwidth can be secured and transmits the result to the edge router. 6. The network according to claim 5, wherein if the reservation is possible, the bandwidth confirmation message is transferred, and resources of each core router or edge router on the path are reserved. 7. A bandwidth guarantee method for a network including a terminal edge router connectable to another network and a core router for connection only within the own network, wherein at least an RSVP (resource release) is provided.
setting control information including information on a bandwidth used by a packet other than the RVP protocol from the first server to the edge router and the core router; and a bandwidth used by the RSVP packet in response to an inquiry from the edge router. Returning a response from the second server to the edge router based on the control information including the information on the RS.
A bandwidth guarantee method characterized by operating on a packet other than a VP. 8. The server according to claim 1, wherein the first server is a provisioning-type policy server for preparing settings for a router, and the second server is a signaling-type policy server for responding to an inquiry from the router. The bandwidth guarantee method according to claim 7, characterized in that: 9. The system according to claim 7, further comprising a database for storing control information generated by estimating a band used by a packet other than the RSVP in consideration of a band used in the RSVP. 8. The bandwidth guarantee method according to 8. 10. A design server for estimating a band used by a packet other than the RSVP in consideration of a band used in the RSVP, generating control information, and storing the control information in the database. 9. The bandwidth guarantee method according to 9. 11. The edge router, upon receiving a path setting message for setting a path to a connection destination,
The second server inquires whether or not the sender of the path setup message can use the RSVP service. The second server confirms control information on the RSVP packet in response to an inquiry from the edge router. And transmitting a result of the availability of the RSVP service to the edge router. The edge router transfers the path setting message if the RSVP service is available, and passes the path setting message to each of the core router and the edge router on the route. The bandwidth guarantee method according to any one of claims 7 to 10, wherein a state is set. 12. When the edge router receives a response signal to the path setup message and a bandwidth confirmation message for confirming bandwidth reservation, the node has sufficient resources in the node to provide the requested bandwidth. The second server determines whether or not the requested bandwidth can be secured and transmits the result to the edge router. 12. The bandwidth guarantee method according to claim 11, wherein the bandwidth confirmation message is transferred if the bandwidth can be secured, and resources of each core router or edge router on the path are secured.