JP3011177B2 - Address resolution processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for transferring an Internet packet onto an ATM network, and more particularly to an address solution processing method for resolving an address in an ATM network from a destination address of a transferred packet.

[0002]

2. Description of the Related Art In order to incorporate the Internet network into an ATM network, a conventional technique for managing the correspondence between a logical address (IP address) and an ATM address (Japanese Patent Laid-Open No. 9-8817, 9).
-214500). In the prior art, an address resolution device is deployed in an ATM network, and the address resolution device manages an IP address and an ATM address of a terminal directly connected to the ATM network. The transmitting terminal inquires of the address resolution device about an ATM address corresponding to the destination IP address in order to transfer the IP packet to the ATM network (Request).
If the address resolution device cannot resolve the request, the request is transferred to another address resolution device as it is.

[0003]

However, this prior art has the following problems. First, if the address resolution device cannot resolve the address, the inquiry (Reques
t) is transferred to another address resolution device as it is. Therefore, in the worst case, the inquiry goes through all the address resolution devices, and the address resolution takes a very long time. This is the first problem.

Next, since the address resolution device only manages the terminals directly connected to the ATM network, the address resolution device indirectly connects via the user network directly connected to the ATM network.
The P network cannot know the logical address (IP address) of the IP network. That is, the address resolution device may not be able to determine to which ATM address the IP packet passing through the ATM network should be transferred, and may not be able to execute the address resolution process. This is the second problem.

[0005] Finally, in the prior art, the ATM network is layer 3
It does not have a means to terminate the routing protocol. Therefore, the IP networks need to be directly connected to each other with a mesh through the ATM network. If there are many IP networks to be connected, it is very difficult or expensive to realize a mesh connection on the ATM network. This is the third problem.

SUMMARY OF THE INVENTION An object of the present invention is to transfer an Internet packet onto an ATM network from a destination IP address of an IP packet to be transferred to a destination ATM to be transferred within the ATM network.
An object of the present invention is to provide an address resolution processing device that realizes address processing for resolving an address at high speed and easily.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a technique for transferring an Internet packet onto an ATM network, the process of resolving a destination ATM address to be transferred in an ATM network from a destination IP address of an IP packet to be transferred (address resolution). Processing) is realized at high speed and easily.

Before describing the means for solving the problems, the configuration of the present invention will be briefly described. As shown in FIG. 1, an edge device is provided at a demarcation point between an ATM network and a user network, and a plurality of address transfer devices are provided in the ATM network. The plurality of address transfer devices are connected in a ring, and construct an address transfer link in the ATM network. In addition, a plurality of edge devices are connected to each address transfer device.

The address resolution processing method of the present invention uses an ATM
An address transfer device that is provided in an ATM network and transfers a plurality of IP packets connected in a ring in a user network connected by a network and a router;
A plurality of edge devices including an upper layer protocol, which are provided at a demarcation point of an ATM network and a user network, are connected under an address transfer device, and exchange routing information ; Emotion
Routing protocol for exchanging information and routing
The acquired routing information is retained by the protocol.
The transfer destination address of the received IP packet in the ATM network
The address resolution table referred to for resolution
A from the destination IP address of the transferred IP packet
It is characterized in that the destination ATM address to be transferred in the TM network is resolved .

The edge device terminates a routing protocol of a user-side router and uses a BGP (Border Gateway Protocol) used for communication with a user network connected via a router or another edge device.
) And B for exchanging routing information between edge devices
It has a BGP agent layer lower than the GP and an address resolution table that holds routing information collected from other edge devices through the BGP agent layer.

Further, the address transfer device multiplexes an address transfer packet received from a plurality of connected edge devices and an address transfer packet received from a previous-stage address transfer device connected in a loop, and performs a subsequent-stage address transfer device. And DROP means for copying an address transfer packet received from the preceding address transfer device and sending the copied address transfer packet to a plurality of connected edge devices.
Since the address forwarding packets sent from the edge device connected to its own address transfer device to avoid the endless loop in a ring shape, and a discarding means for discarding round address transfer packet, the address transfer device Via
By sending and receiving address transfer packets
The destination ATM address to be transferred in the ATM network is resolved from the destination IP address of the transferred IP packet with reference to the address resolution table of the transfer device.

In the case of the prior art, the address resolution server, which is a device in the ATM network, has a high-performance upper-layer protocol, whereas the edge device of the ATM network has a high-performance upper-layer protocol. The address transfer device in is implemented by simple hardware.

A first feature of the present invention is that each edge device has a “BGP agent layer”, and the “BGP agent layers” of all edge devices function together to convert the entire ATM network into a huge pseudo router. Is to build. The edge device has a high-performance higher-level protocol, and the configuration of the function is shown in the protocol stack of the edge device shown in FIG.

First, since the edge device is connected to the user-side router, a function for terminating the routing protocol of the user-side router is required. This is the BGP (Border Gatew
ay Protocol). Each edge device can know a user network that can be reached via the user-side router by performing BGP communication with the user-side router. At the same time, the edge device needs to perform BGP communication with the ATM network side to know a user network that can be reached through another edge device. For this purpose, in the present invention, a “BGP agent layer” is prepared in a layer below the BGP of the edge device.

The BGP agent layer exchanges minimum necessary routing information with the BGP agent layer of another edge device, and holds the routing information collected from the other edge device in the address resolution table of the edge device. By referring to the address resolution table, the BGP agent layer of the edge device recognizes that the ATM network is one large pseudo router with respect to BGP as an upper layer. In other words, the BGP of the edge device is in a state where a single huge pseudo router is connected to the ATM network side. In addition, the user-side router sends an IP to another user network through three devices, namely, an edge device to be connected, a huge pseudo router, and a destination edge device located at a position exiting the ATM network.
You are ready to transfer packets. A second feature of the present invention is that the routing information is converted into an address transfer packet in order to notify the change of the routing information between the edge devices, and the address transfer is performed by an address transfer device which is a simple packet multiplexing device. Forwarding packets to all edge devices.

The BGP agent layer of the edge device notifies each other of only necessary minimum routing information (addition of a new network or deletion of an existing network). First, the BGP agent layer communicates with BGP, which is an upper layer in the same edge device. Then, when new user network information is generated in the BGP communication described on the left, it is checked whether or not the information has already been registered by referring to the address resolution table. If it is not registered, it is newly registered in the address resolution table on the left. The function of the BGP agent layer is the same as the BGP of FIG.
This is realized by the agent processing unit.

Further, in order to notify the routing information to the BGP agent layer of another edge device, the information is converted into an address transfer packet and transferred to the nearest address transfer device. The address transfer device is connected to an adjacent address transfer device in a ring as shown in FIG.

The address transfer device uses a simple Add and Dr.
This is an op packet multiplexing device that multiplexes an address transfer packet received from a subordinate edge device and an address transfer packet received from a preceding address transfer device, and sends them to the subsequent address transfer device (Add). Also,
Copy the address transfer packet received from the preceding address transfer device and send it to the subordinate edge device (Dro
p). Further, in order to avoid an endless loop of the address transfer packet transmitted from the edge device under its control, the address transfer packet which has completed one round is actively discarded.

On the other hand, when the BGP agent layer receives an address transfer packet having new network addition information from the address transfer device, it first checks whether or not it has been registered by referring to the address resolution table. If not registered, the BGP agent layer newly registers in the address resolution table. At the same time, the BGP agent layer sends the contents of the address transfer packet to B
Convert to GP communication command and convert to BG in the same edge device
Notify P. In this way, the addition of a new user network is notified to all edge devices. When an existing user network is deleted, the address resolution table is updated and a notification to another edge device is made in the same procedure. The function of the BGP agent layer described above is executed by the BGP agent processing unit.

The address transfer packet used in the above processing is provided with the ATM address of the source edge device as shown in FIG.
All processing is realized by simple packet multiplexing hardware based on the TM address field.

[0021]

Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an address resolution processing system according to the present invention. As shown in the figure, the present address resolution processing method comprises an edge device 101 and an address transfer device 102.
, ATM network 103, router 104, user network side router 105, address transfer link 106
It is composed of The edge device 101 is the ATM network 10
3 and the user network-side router 105. The address transfer device 102 is the ATM network 10
3 are deployed. The address transfer device 102 is connected to a plurality of edge devices 101, and adjacent address transfer devices 102 are connected to each other in a ring shape.

The address resolution processing method of the present invention will be described using a functionally represented protocol stack. FIG. 5 is a diagram showing a protocol stack of an edge device having a higher-level protocol BGP.

The edge device 101 has BGP, which is one of the Internet routing protocols. The edge device 101 exchanges routing information with the user-side router 104 through BGP. The routing information includes a destination IP address / prefix which is an address of a destination user network to which the packet is to be transferred, and
This is the corresponding route information. The route information indicates a route of the network to be relayed before reaching the destination user network.

Similarly, the edge device 101 communicates with the ATM network through BGP. However, the communication partner on the ATM network side is not a specific device but a virtual router that virtually represents the entire ATM network. FIG. 6 shows the concept. In FIG. 6, all the edge devices 1
The BGP agent layer 01 and the hatched address database are virtual pseudo routers representing the entire ATM network.

The edge device 101 is connected to the user-side router 10
4 and the ATM network 103 through the address transfer device 102
Exchange routing information with the side. The edge device 101 has a BGP agent layer. The BGP agent layer of each edge device 101 exchanges routing information with each other through the address transfer layer of the address transfer device 102, and stores the collected information in the address resolution table 211. The BGP agent layer of the edge device 101 has an address resolution table 2
11, the ATM network recognizes the BGP of the upper layer as one huge pseudo router. As a result, the BGP of the edge device 101 is connected 1: 1 with a huge pseudo router located on the ATM network 103 side.

Next, a specific configuration and functions of the BGP agent layer of the edge device 101 will be described. FIG. 2 is a diagram showing a configuration of a BGP agent processing unit for transferring an address packet. The function of the BGP agent layer is realized by the BGP agent processing unit 201. As shown in the figure, the BGP agent processing unit 201 includes a message control unit 202, a setting parameter database 203, a transmission buffer unit 204, a packet generation unit 205, an ATM cell generation unit 206, a reception buffer unit 207, It comprises a filter unit 208, a packet restoration unit 209, an ATM deceleration unit 210, and an address resolution table 211.

First, the message control unit 202 sets the BG stored in the setting parameter database 203 in advance.
With reference to the parameters for P communication, the same edge device 10
1 communicates with the BGP which is an upper layer. Details of the BGP communication are shown in FIG. If a new network is added in the BGP communication, the message control unit 202 refers to the address resolution table 211 to check whether or not a new network has already been added. If registered, do nothing. If there is no registration, the above network is registered in the address resolution table 211. The contents of the address resolution table 211 are as shown in FIG. 8, where the destination IP address / prefix indicating the address of the destination user network, the destination ATM address of the destination edge device in the ATM network, and the edge device The route information of the user network that is relayed after leaving the network is managed.

Further, the message control unit 202 transfers the above routing information to the transmission buffer control unit 204. The transmission buffer control unit 204 sends this information to the packet generation unit 205. The packet generation unit 205 sends the address information on the left in the address transfer packet 401 shown in FIG. ATM cell unit 2
06 converts the address transfer packet into an ATM cell and
The data is transferred to the TM network 103.

When the BGP agent processing unit 201 receives an address transfer packet issued by the BGP agent processing unit of another edge device, it similarly checks the registration status of the address resolution table 211, When there is a change, the contents of the table 211 are updated. First, the ATM decelerating unit 210 receives the address transfer packet in the form of an ATM cell, removes the ATM cell header, and transfers the packet to the packet restoration unit 209. The packet restoration unit 209 reassembles the original address transfer packet and sends it to the filter unit 208. The filter unit 208 refers to the address resolution table 211, checks whether the address information in the address transfer packet is new or changed, and updates the address transfer table 211. When the address transfer table 211 is updated, the routing information is sent to the reception buffer unit 207 at the same time. The reception buffer unit 207 sends the left information to the message control unit 202. The message control unit 202 puts the information on the left in a BGP command and notifies the BGP as an upper layer.

Next, the transfer operation of the address transfer packet exchanged between the BGP agent processing units will be described focusing on the configuration and function of the address transfer device.

Address transfer packet 401 generated by BGP agent processing section 201 of edge device 101
Is transmitted to the address transfer device 102. The address transfer device is an ADD / DROP type packet multiplexing device, and is realized by simple hardware. In the address transfer apparatus 102, as shown in FIG. 3, first, the ATM decellularization unit 304 receives the address transfer packet 401. The ATM decellularizing unit 304 removes the ATM cell header and sends it to the packet restoring unit 303. Packet restoration unit 3
03 restores the address transfer packet 401 and sends it to the packet multiplexing unit 305. Similarly, the address transfer packet 401 sent from the preceding address transfer device 102 is similarly transmitted to the ATM decellularizing unit 301 and the packet restoring unit 3.
02 to the packet multiplexing unit 305. The packet multiplexing unit 305 multiplexes the packet of the address transfer packet 401 transmitted from the edge device 101 and the address transfer device 102 in the preceding stage, and transmits the multiplexed packet to the ATM cell forming unit 306. The ATM cell conversion unit 306 converts the address transfer packet 402 into an ATM cell and sends it to the subsequent address transfer device 102 (ADD function).

The packet restoring unit 302 monitors an address transfer packet received from the address transfer device 102 at the preceding stage, and if the source edge device ATM address is the address of the edge device 101 under its control, the packet restoration unit 302 goes around the address transfer link. Since the packet has returned, it is discarded. Otherwise, it copies the address transfer packet and transfers it to the edge device 101 under its control (DROP function).

In this way, the address transfer packet is transferred to all edge devices 101 by hardware processing,
The routing information can be exchanged between the edge devices 101.

[0035]

Next, the operation of the embodiment of the present invention will be described with reference to the drawings. In the address resolution processing method of the present invention, as shown in FIG. 1, an edge device 101 is provided at a demarcation point between an ATM network 103 and a user network side router 105, and an address transfer device 102 is provided in the ATM network 103. You. Each address transfer device 102 is connected to a plurality of edge devices 101. Also, the address transfer device 10
2 is connected in a ring shape between adjacent devices to form an address transfer link 106. (1) Operation of Edge Device First, an outline of functions of the edge device will be described with reference to FIG. The edge device 101 has BGP, which is one of the Internet routing protocols. Edge device 10
1 exchanges routing information with the user-side router 104 through BGP. The routing information is information excluding the destination ATM address in each row of FIG.
That is, the destination IP address / prefix, which is the address of the destination user network to which the packet is to be transferred, and the corresponding route information. The route information indicates a route of the network to be relayed before reaching the destination user network. Similarly, the edge device 101 communicates with the ATM network through BGP. However, the communication partner on the ATM network side is not a specific device but a virtual router that virtually represents the entire ATM network. FIG. 6 illustrates the concept described on the left. In FIG. 6, the BGP agent layers and the hatched address databases of all the edge devices 101 become virtual pseudo routers representing the entire ATM network.

[0036] When the show back to FIG. 6, BGP of or falling edge of the self-device
The agent layer and the address transfer layer of the address transfer device cooperate to construct a pseudo router indicated by oblique lines . Therefore, the BGP of the edge device 101 recognizes that it is connected 1: 1 with a huge router located on the ATM network 103 side. The user-side router 104 is connected to the edge device 10 to be connected as a path for packet transfer in the ATM network.
1, a pseudo router, and other edge devices 101
Recognize the three routers.

Next, how the BGP agent layer operates will be described. The BGP agent layer is realized by the BGP agent processing unit 201.
The main functions of the BGP agent processing unit are the following three.

The first function is a function of communicating with a higher-level BGP and terminating the BGP. The BGP communication includes transmission and reception of a plurality of packets as shown in FIG. The BGP agent processing unit 201 terminates the BGP communication while referring to the setting parameter database 203 stored therein. The setting parameter database 203 holds various parameters for smooth communication. In this way, the BGP of the edge device 101 recognizes as if it were communicating with one different router.

The second function is a function of constructing an internal address resolution table 211 based on new routing information (address and route information of a destination user network) obtained by BGP communication. As a first example, assume that the routing information on the left implies the addition of a new network. First, the address resolution table 211 is searched based on the destination user network address of the obtained routing information. If there is no registration, it is completely new information, so the address resolution table 2
Register at 11. At this time, an ATM address previously given to the own edge device is added to the field of the destination ATM address. If exactly the same information including the route information is registered, it is duplicate information, and the obtained routing information is discarded as it is. When there is a registration with different route information, the content of the registration of the route information is changed to the route information based on the new routing information.

As a next example, a case where new routing information obtained by BGP communication is deleted will be described. First, a search is performed in the address resolution table 211 based on the address of the destination user network of the obtained routing information. If there is a registration, delete that registration. If there is no registration, the routing information is discarded as it is.

As a last example, a case where an address transfer packet transmitted by the BGP agent processing unit 201 of another edge device 101 is received from the ATM network side will be described. Also in this case, the address resolution table 211 is updated in the same procedure as in the above example. However, in the case of adding new routing information, the source ATM address of the address transfer packet is written in the destination ATM address field.

A third function is that, when the address resolution table 211 is updated with the routing information obtained by the BGP communication, the routing information is also notified to the BGP agent processing unit 201 of the other edge device 101. It is. First, the routing information is converted into an address transfer packet. Then, the packet is converted into an ATM cell and transferred to the ATM network 103.

Next, the above-mentioned functional operation will be described with reference to detailed blocks in the BGP agent processing unit 201.

The BGP agent processing unit 201 includes a message control unit 202 and a setting parameter database 2
03, the transmission buffer unit 204, and the packet generation unit 20
5, an ATM cell unit 206, and a reception buffer unit 207.
, A filter unit 208, a packet restoration unit 209,
ATM decelerating unit 210 and address resolution table 21
1 First, the message control unit 202 communicates with the upper BGP, and terminates the control of the BGP communication shown in FIG. At the time of communication, the setting parameter database 203 is referred to. If there is a change (new addition, deletion, change) of the routing information in the BGP communication, the information in the address resolution table 211 is changed. The procedure for changing the address resolution table 211 is as described above. At the same time, the message control unit 202 transfers the above routing information to the transmission buffer control unit 204. The transmission buffer control unit 204 sends this information to the packet generation unit 205. The packet generation unit 205 converts the routing information on the left into the address transfer packet 4 shown in FIG.
01 and sent to the ATM cell conversion unit 206. In the field of the source ATM address of the address transfer packet 401, the ATM address assigned to the edge device itself is added. Further, the ATM cell conversion unit 206 converts the address transfer packet 401 into an ATM cell and transfers the ATM cell to the ATM network 103.

Further, the BGP agent processing unit 201 of the other edge device 101
When the address transfer packet issued by No. 1 is received, the registration status of the address resolution table 211 is similarly confirmed.
Update the contents of 1. First, the ATM decelerating unit 210 receives an address transfer packet in the form of an ATM cell,
The M cell header is removed and transferred to the packet restoration unit 209. The packet restoring unit 209 reassembles the original address transfer packet and sends it to the filter unit 208. The filter unit 208 refers to the address resolution table 211 and determines whether the address information in the address transfer packet is new or not.
It is checked whether it is a change, and the address transfer table 211 is updated. When updating the address transfer table 211, the address information is sent to the reception buffer unit 207 at the same time. The reception buffer unit 207 sends the address information to the message control unit 202 as it is. The message control unit 202 sends the address information on the left to a BGP command, and notifies the BGP of a higher order. (2) Operation of Address Transfer Apparatus Next, transfer processing of an address transfer packet will be described focusing on functions of the address transfer apparatus.

First, the address transfer packet 401 is transmitted from the edge device 101 to the nearest address transfer device 102. The address transfer device 102 is an ADD / DROP type packet multiplexing device configured by hardware. In the address transfer device 102, first, the ATM
The decelerator 304 receives the address transfer packet 401. The ATM decellularizing unit 304 removes the ATM cell header and sends it to the packet restoring unit 303. The packet restoration unit 303 restores the address transfer packet 401 and sends it to the packet multiplexing unit 305. Similarly, the address transfer packet 401 transmitted from the address transfer device 102 in the preceding stage
Is transmitted to the packet multiplexing unit 305 via the ATM decellularizing unit 301 and the packet restoring unit 302 in the same manner. The packet multiplexing unit 305 multiplexes the packet of the address transfer packet 401 transmitted from the edge device 101 and the address transfer device 102 in the preceding stage, and transmits the multiplexed packet to the ATM cell forming unit 306. The ATM cell conversion unit 306 converts the address transfer packet 402 into an ATM cell and sends it to the subsequent address transfer device 102.

The packet restoring unit 302 monitors an address transfer packet received from the address transfer device 102 at the preceding stage, and if the source edge device ATM address is the address of the edge device 101 under its control, the packet restoring unit 302 loops over the address transfer link. Since the packet has returned, it is discarded. Otherwise, it copies the address transfer packet and transfers it to the edge device 101 under its control. In this way, the address transfer packet is transferred to all the edge devices 101 by hardware processing, and exchange of address information between the edge devices 101 is enabled.

[0048]

First, the first problem of the prior art is that address resolution may take a very long time. According to the present invention, the BGP agent processing unit of each edge device collects the routing information of the entire ATM and constructs an address resolution table indicating the correspondence between the ATM address and the address of the destination user network. The processing is completed by the device, and extremely high-speed address resolution processing is possible. Therefore, this problem is solved.

Next, a second problem of the prior art is that it may not be possible to execute the address resolution processing under the condition that the Internet network and the ATM network are connected. According to the present invention, the Internet standard protocol BGP
Is used to exchange routing information with the Internet network connected to the ATM network, so that it is possible to specify an edge device that should always transfer all IP packets.
Thereby, the second problem is solved.

Finally, the third problem of the prior art is that the ATM
The construction of a mesh path to transfer routing information in a network would result in a very high network cost. According to the present invention, since an address transfer link is constructed by connecting the transfer address transfer devices in a ring, there is no need to construct a mesh network between edge devices in the ATM network. Also, the message control unit of the edge device terminates the BGP communication and transfers only the minimum necessary change information to the ATM network.
It is possible to reduce useless bandwidth in the ATM network due to communication. As a result, the third problem in which the network cost is a problem can be solved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an address resolution processing method according to the present invention.

FIG. 2 is a diagram illustrating a configuration of a BGP agent processing unit that transfers an address packet.

FIG. 3 is a diagram illustrating a transfer operation of an address transfer packet exchanged between BGP agent processing units.

FIG. 4 is a diagram illustrating an address transfer packet to which an ATM address of a source edge device is assigned.

FIG. 5 is a diagram showing a protocol stack of an edge device having a high-function higher-level protocol.

FIG. 6 is a diagram showing a concept of a pseudo router virtually representing the entire ATM network. The BGP agent layers and the hatched address databases of all edge devices become virtual pseudo routers.

FIG. 7 is a diagram illustrating details of BGP communication in a BGP agent processing unit. The message controller communicates with BGP, which is an upper layer in the same edge device, with reference to the BGP communication parameters stored in the setting parameter database in advance.

FIG. 8 is a diagram showing contents of an address resolution table of a network whose addresses are registered.

[Explanation of symbols]

 Reference Signs List 101 edge device 102 address transfer device 103 ATM network 104 router 105 user network 106 address transfer link 201 BGP agent processing unit 202 message control unit 203 setting parameter database 204 transmission buffer unit 205 packet generation unit 206, 306 ATM cell conversion unit 207 reception Buffer unit 208 Filter unit 209, 302, 303 Packet restoration unit 210, 301, 304 ATM decellularization unit 211 Address resolution table 305 Packet multiplexing unit 401 Address transfer packet 402 Address information packet

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/28 H04L 12/46 H04L 12/56 H04L 12/66

Claims (7)

(57) [Claims] 1. An address solution processing method for a user network connected by a router to an ATM network, wherein the address transfer device is provided in the ATM network and transfers a plurality of IP packets connected in a ring. And a plurality of edge devices, including a higher-level protocol, provided at a demarcation point of a user network and connected under the address transfer device and exchanging routing information, wherein the edge device includes a routing device between the edge devices. information
The routing protocol to be exchanged and the routing
The acquired routing information is retained by the protocol.
The transfer destination address of the received IP packet in the ATM network
The address resolution table referred to for resolution
A from the destination IP address of the transferred IP packet
An address resolution processing method for resolving a destination ATM address transferred in a TM network. 2. The edge device terminates a routing protocol of a user-side router, and BGP used when communicating with a user network connected via the router or another edge device. 2. The address resolution according to claim 1, further comprising a BGP agent processing unit including a BGP agent layer for exchanging routing information, and an address resolution table for holding routing information collected from another edge device through the BGP agent layer. Processing method. 3. The address transfer device multiplexes an address transfer packet received from a plurality of connected edge devices and an address transfer packet received from a previous-stage address transfer device connected in a loop, and performs address transfer in a subsequent stage. ADD means for sending to the device, DROP means for copying the address transfer packet received from the preceding address transfer device and sending it to a plurality of connected edge devices, and edge device connected to its own address transfer device And discarding means for discarding the cycled address transfer packet in order to avoid an infinite loop of the address transfer packet transmitted from the address transfer packet.
Address resolution of the edge device by transmitting and receiving
Referring to the table, the destination I of the transferred IP packet
2. The address resolution processing method according to claim 1, wherein the destination ATM address to be transferred in the ATM network is resolved from the P address. 4. The address transfer apparatus according to claim 1, wherein said address transfer apparatus receives an address transfer packet, and sends out the ATM cell header after removing said ATM cell header; and a source ATM of said address transfer packet received from a preceding stage.
Monitoring the address, applicable when the source ATM address of the can discard the A <br/> address forwarding packets applicable when the address of the edge device connected to the own station, not the address of the edge device connected to the own station A packet restoring unit that copies the address transfer packet of the packet and transfers it to the edge device connected to the local station; a packet multiplexing unit that multiplexes the address transfer packet transmitted from the preceding stage; and an ATM that multiplexes the address transfer packet. 2. The address resolution processing method according to claim 1, further comprising an ATM cell conversion unit that converts the data into cells and transmits the cells. 5. The BGP agent processing unit refers to a stored BGP communication parameter,
When a new network is added by performing communication with the BGP as an upper layer, a message control unit that executes registration after confirming the new network and transfers routing information; A setting parameter database to be stored, an address resolution table prepared for executing the registration, and managing a destination ATM address and route information in an ATM network with respect to the address of the network, and the routing information for packet generation. A sending buffer unit for sending; a packet generating unit for sending the destination ATM address and the address information of the routing information in an address transfer packet;
An ATM cell unit for transferring the packet to the network; receiving the address transfer packet in the form of an ATM cell;
An ATM decellularizing unit for removing the M cell header and transferring the packet; a packet restoring unit for reassembling and transmitting the original address transfer packet; receiving the address transfer packet; and referring to an address resolution table to determine the address information in the packet. A filter unit for confirming that the address resolution table is new and updating the address resolution table; and a reception buffer unit for simultaneously receiving the routing information and transferring it to the message control unit when updating the address resolution table. The address resolution processing method according to claim 2. 6. An address solution processing method in a user network coupled to an ATM network and a router, comprising: an address transfer device provided in the ATM network for transferring a plurality of IP packets connected in a ring; And a plurality of edge devices having a higher-level protocol, which are provided at a demarcation point of a user network, are connected under the address transfer device, and exchange routing information, and have an ATM network through a user-side router and the address transfer device. B of the edge device exchanging routing information with the side
The GP agent layer exchanges routing information with each other through the address transfer layer of the address transfer device, and has an address resolution table for storing collected information. By referring to the address resolution table, the GP agent layer In contrast, the entire ATM network is
It recognizes that it is a huge pseudo router, and as a result, B of the edge device
GP is one-to-one with the pseudo router located on the ATM network side.
Address resolution processing method, characterized in that connection is made by using 7. The address resolution process according to claim 6, wherein said pseudo router is an ATM network including a BGP agent layer of said edge device, an address transfer device and an address transfer link connecting them in a loop. method.