JP3526778B2 - Router type connectionless server device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connectionless server and a high-speed router used for a high-speed backbone network such as the Internet. 2. Description of the Related Art Reference name 1.1996 IEICE Society Conference B
-543 "A Study on Broadband Connectionless Server" Computer & Network LAN 1996.2.
(Magazine: Ohmsha) "A world of 5.3 Mbps transmission performance realized by routing and ATM switching" The conventional connectionless server is a connectionless server (ITU-T recommended I.364 protocol). In Reference 1), a high-speed forwarding function was realized. Forwarding is a function of transmitting a packet to an interface other than the network in the direction of reception without discarding the packet. The problem of the conventional connectionless server is that the address to be forwarded is fixedly set, and the forwarding is passively performed based on the address. Therefore, it is difficult to perform forwarding by flexible routing such as a router. The router has a filtering function for discarding received packets in addition to forwarding, and is a device for determining a route of a packet. The basic operation is forwarding, which is to take out a packet from a frame and make an inquiry to a routing table for a destination of the packet to determine a routing. However, conventional routers are assembled into packets to perform routing processing flexibly,
There is a problem that it is difficult to realize a high-speed transfer function because it is realized by software. [0003] Therefore, IP-Switch (reference document 2), which has attempted to solve these drawbacks, applies ATM-Switch (ATM cell exchange) to high-speed forwarding processing, and applies a router to routing processing to solve the above problem. Tried to solve. The IP-SW router processes the first packet as a default route. Then, the IP-SW forms an ATM connection when the packet continues for a long time such as FTP (file transfer). And IP
-Switch performs the forwarding process by ATM-Swi
High-speed forwarding was realized by shortcuts on tch. In other words, IP-Switch is
After the formation of the ATM connection, the forwarding process can be omitted. [0004] However, this I
Even in the device of P-Switch (reference document 2), the processing efficiency of high-speed forwarding is reduced because the process is a normal router process until the shortcut path is realized. This I
P-Switch is an approach that attempts to solve the shortcomings of routers and connectionless servers. If the short cut is established, it will have the same effect as the forwarding function. However, even in this method, there is a problem that the efficiency of the high-speed transfer function is reduced until the shortcut is established. In a connectionless server device for processing a packet by converting it into an ATM cell, a routing processor having a routing protocol process and a control protocol process, and a transfer route to the routing processor are provided. A router-type connectionless server device comprising: a high-speed forwarding processor for transferring packets in cell units; and a determination switching unit for switching a data transfer route to a high-speed forwarding processor or a routing processor depending on a packet type. A description will now be given of a first embodiment of the present invention. FIG. 2 shows a network configuration to which the router type connectionless server device 3 of the present invention is applied. FIG. 1 shows a configuration of a router type connectionless server 3 of the present invention. FIG. 3 shows a high-speed forwarding protocol stack of data between the hub router 4 and the router type connectionless server 3 applied to the network configuration of FIG. The protocol stack indicates a hierarchical structure of the protocol. FIG.
2 shows a protocol stack of router processing / control data processing for user / control data between the concentrator router 4 and the router type connectionless server device 3 applied to the network configuration of FIG. The network configuration shown in FIG. 2 will be described. The concentration router 2 accommodates a plurality of terminals including a user terminal such as the terminal 1 or a user router. The hub router 2 terminates the user protocol. The concentrator 2 is a connectionless transfer network protocol of the ATM transfer system, that is, the CLL shown in FIGS. Convert the packet or cell to the H.364 protocol. The concentrator 2 is connected to the router type connectionless server device 3. Similarly, a plurality of terminals including a user terminal such as the terminal 5 or a user router as the opposite side are connected to the concentrator router 4.
Through the connection to the router type connectionless server 3. The router type connectionless server device 3 accommodates a plurality of concentrating routers such as a concentrating router 4. The configuration of the router type connectionless server device 3 of FIG. 1 will be described. Router type connectionless server
Server device 3 is a concentrator router 2 accommodating terminal 1 of FIG.
Then, the line is terminated by the line interface circuit 10 connected through the connection line 7. Then, the line interface circuit 10 is connected to the judgment switching circuit 11. The line is connected from the decision switching circuit 11 to the routing processing unit 12 via the connection route 16 and to the forwarding processing unit 13 via the connection route 17. The line between the routing processing unit 12 and the forwarding processing unit 13 includes a connection route 18 for transmitting necessary routing information for forwarding and receiving data of an unresolved address from the forwarding processing unit. Further, the line from the routing processing unit 12 has a connection route 20 connected to the determination switching circuit 14 for data transfer to the terminal 5 in FIG. One of the lines from the decision switching circuit 11 is connected to a forwarding route 17 by a connection route 17.
3 is connected. The forwarding processing unit 13 performs high-speed forwarding of data. The forwarding processing unit 13 transmits the judgment switching circuit 1 through the connection route 19.
4 is connected. The decision switching circuit 14 is connected to the line interface circuit 15. Further, the line interface circuit 15 is configured to be connected to the concentrator router 4 accommodating the terminal 5 in FIG. Next, the operation of this embodiment will be described. In FIG. 2, an operation when data is transferred from the user terminal or the user router of the terminal 1 to the user terminal or the user router of the terminal 5 will be described. First, the concentrator 2 receives a packet or a cell as transfer data from the terminal 1 through the connection line 6. Concentration router 2 is connected to terminal 1
If ATM performs ATM, that is, cell transfer of the asynchronous transfer method, the ATM protocol is terminated. If the terminal 1 is not the ATM transfer system, the hub router 2 terminates the protocol,
Convert to ATM transfer protocol. Furthermore, the line concentrating router 2 is a router type connectionless server device 3 of the present invention.
Connectionless protocol, ie, FIGS. 3 and 4
CLL, which is a connectionless layer of I.E. 364
The user data is encapsulated in the protocol and transferred to the router type connectionless server device 3. [0011] The connectionless protocol is formatted so that routing information is placed in the first cell of the ATM. The router-type connectionless server device 3 has a connectionless layer CLL.
When the forwarding information is resolved according to the connectionless protocol, there is a function of performing high-speed forwarding by the concentrator router 4 in cell units. If the forwarding information has not been resolved, the router type connectionless server device 3 determines an address to be sent. And router type connectionless server
The transfer device 3 transfers the data to the concentrator router 4 by a router process for transferring data. The hub router 4 terminates the connectionless protocol of the router-type connectionless server device 3 and converts the connectionless protocol into the user protocol of the terminal 5.
The data is transferred to the terminal 5 through the connection line 9. When the transfer is performed from the terminal 5 to the terminal 1, the same description is given by replacing the operation description of the terminal 1 and the terminal 5 and the operation of the concentrator router 2 and the concentrator router 4 in the above description. The operation of the router type connectionless server device 3 of the present invention will be described with reference to FIG. Terminal 1 of FIG.
The router-type connectionless server device 3 receives data from the concentrating router 2 accommodating the PHL through the connection line 7 and the PHL as the physical layer, the ATM as the ATM layer, and the ATM adaptation layer in FIG. 3 or FIG. AAL
Is terminated by the line interface circuit 10. Next, the router type connectionless server device 3
The determination switching circuit 11 determines whether the cell or packet is a data cell or data packet, or a control cell or control packet. Next, the router type connectionless server device 3 transfers the data to the forwarding processing unit 13 through the connection route 17. The forwarding processing unit 13 uses a connectionless protocol, CLL, for example, I. 364 protocol is terminated. Then, when the cell or packet is a data cell or data packet and the forwarding address is resolved, the forwarding processing unit 13 transfers the cell or packet to the determination switching circuit 14 at high speed through the connection route 19 in cell units. When the cell or packet is a control cell or control packet and the forwarding address is not resolved, the router type connectionless server 3 transfers the cell or packet to the routing processing unit 12 through the connection route 18. The routing processing unit 12 performs packet processing as a router. Then, the router type connectionless server device 3 executes the routing process on the judgment switching circuit 1 through the connection route 20.
4 and the line interface circuit 15
It is made into a cell, and the concentrator router 4 of FIG.
Transfer to Conversely, in the case of transferring cells or packets from the connection line 8 to the connection line 7 in the router-type connectionless server device 3, the line interface circuit 10, the line interface circuit 15, the judgment switching circuit 11 The same explanation will be given by replacing the explanation of the operation of the judgment switching circuit 14. Next, a usage mode will be described. In the embodiment, the protocol of the connectionless transport network is I. 36
The router type connectionless server device realized in the above-mentioned protocol has been described.
83, a router-type connectionless server device that implements the AAL protocol with AAL5,
It is applicable as a router-type connectionless server device corresponding to a protocol in which Pv4 is encapsulated in RFC1483 by AAL5. A high-speed forwarding function and a flexible routing function are realized by configuring a router type connectionless server device having a judgment switching circuit, a forwarding processing unit and a routing processing unit.
In addition, the problem that the processing efficiency of high-speed forwarding is reduced because normal router processing is performed until the above-described conventional IP-SW shortcut path is realized is solved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 Configuration of router type connectionless server device FIG. 2 Network configuration FIG. 3 High-speed forwarding protocol stack FIG. 4 User / control Data transfer protocol stack [Description of symbols] 1, 5 Terminal 2, 4 Concentrator router 3 Router type connectionless server device 6, 7, 8, 9 Connection line 10, 15 Line interface circuit 11, 14 Judgment switching circuit 12 Routing Processing unit 13 Forwarding processing unit 16, 17, 18,
20 connection routes

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shigehiko Ushijima 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Hiroyuki Ichikawa 3-19, Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Within Nippon Telegraph and Telephone Corporation (56) References JP-A-6-30036 (JP, A) JP-A-2000-49869 (JP, A) Hiroshi Asai et al., Development of connectionless server, Oki Electric R & D, Japan, Oki Electric Industry Co., Ltd., April 1996, No. 107, Vol. 63, No. 2, pp23-26 (58) Fields investigated (Int. Cl. ⁷ , DB name) H04L 12/28 H04L 12/66

Claims (1)

(57) [Claim 1] In a connectionless server device for processing a packet by converting it into an ATM cell, a routing processor for performing a routing protocol process and a control protocol process; A router-type connection having a forwarding route and forwarding a packet in a cell unit, and a determination switching unit for switching a data forwarding route to the forwarding processing unit or the routing processing unit depending on the type of the packet. Server device.