JPH0773268B2 - ISDN address management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A local area network (LA) that handles ISDN packets.
N) regarding the ISDN address management method.

(Prior Art) An access method in which a media access (MAC) address used in a LAN is added to an ISDN packet, for example, a LAPD packet and integrated with another packet service is under study. In this network, as shown in Fig. 2 (a), a LAPD data unit consisting of a service access point identifier (SAPI), a terminal identifier (TEI), a control field (C), etc. is used as a LAN MAC address vs. DA (destination address). ,
LAN shown in Fig. 2 (b) with SA (source address) added
It is treated in the same way as communication between terminals. In FIG. 2 (b), a data unit starting at the destination service access point (DSAP) and the originating service access point (SSAP) is surrounded by a MAC address pair. A frame check sequence (FCS) is added to the end of the frame. Note that the delimiter information of the packet frame is omitted for simplicity of explanation. In this method, the MAC address is used to
It is necessary to identify whether or not APD information is being transmitted. As a method for realizing this, the applicant of the present application
October 16, 1987 Patent application (7) "Protocol identification method"
Have applied for. This is a D channel handler (ISDN server) for at least one of the DA / SA pair of MAC addresses.
If the MAC address assigned to the packet is included, it is recognized as a packet of the frame format shown in FIG. 2 (a), and if not included, it is recognized as the format of FIG. 2 (b). .

(Problems to be Solved by the Invention) As shown in FIG. 1, in a network in which terminals 2 and 3 are connected to a D channel handler 44 through a LAN 1 and an ISDN interface 4, a packet frame used in LAN is used. LAPD data units can be transmitted.
However, unlike the LAN MAC address, the TEI value can change for each call, and one terminal can be assigned with multiple TEIs. Here, CCITT Res book Volume
III-Fascicle III.5 Integrated service Digital Net
The TEI allocation method described in work (ISD) Rec.I.441 will be described with reference to FIGS. 4 and 5. Figure 4 (a)
Fig. 4 (b) shows the LAPD data unit.
Indicates the contents of INFO of the allocation (management) data unit. Management ID, reference number (R
i), message type and action indicator (Ai). TEI is assigned according to the procedure shown in FIG. The user has an unnumbered frame (UI) for the ASP (assignment source point) in ISDN
SAPI = 63 (value indicating TEI allocation control), TEI = 12
7 (indicates group communication), management ID = 15 (2
Then, a message type indicating an ID request is set, and a random value Ri and Ai indicating a desired TEI value are transmitted. The ASP uses an unnumbered frame (UI) as its response signal, SAPI = 63 (value indicating TEI allocation control), TEI = 127 (indicating group communication), management ID = 15 (00001111 in binary display). ), A message type indicating ID allocation is set, and Ri set by the user and TE assigned
Send Ai indicating the I value to the user. Through the above procedure, TEI is assigned to each terminal.

Next, a method for realizing this procedure in the network shown in FIG. 1 will be described with reference to FIG. For communication from the terminal, the destination address DA is set to the MAC address of the ISDN interface 4 in the packet frame shown in FIG.
Set the calling address to the MAC address of the terminal. On the other hand, for communication from the ASP, the ISDN interface 4 sets a destination address for giving group communication in the LAN 1 corresponding to TEI indicating group communication, and sends the transmission address as the MAC address of the ISDN interface.
As described above, the procedure shown in FIG.
It can also be realized in DN service. But,
An address management method is required to associate the TEI value assigned to the terminal with its MAC address.

The present invention provides a method and apparatus for managing the correspondence between the MAC address of a terminal and the assigned ISDN address without providing a new procedure in a network in which a LAN MAC address is added to a LAPD data unit for transmission. It is in.

(Means for Solving the Problems) According to the present invention, a terminal and an ISDN system are connected to each other, and the terminal address and the ISDN address assigned to the terminal and the ISDN system are used for the destination information and the sender information of the packet. In the ISDN address management method for managing the correspondence between the terminal address and the ISDN address by receiving packet from the terminal to the ISDN system,
Using the sender information of the received packet received and the ISDN address of the LAPD data unit in the received packet to create an address comparison table between the terminal address and the ISDN address, when transmitting data from the ISDN system Is the LAPD
Search the address comparison table based on the ISDN address of the data unit, obtain bucket address information corresponding to the ISDN address, the packet address information
It is characterized in that it is added to the LAPD data unit as the destination information and assembled and transmitted as a packet signal.

(Example) FIG. 1 shows an example of the present invention. The terminals 2 and 3 are connected to the LAN 1 and further connected to the D channel handler 44 by the ISDN interface 4. The receiving unit of the terminal 2 detects the destination address DA, the address filter 21, and the originating address SA is detected.
If the MAC address of the received packet is the LAPD processing unit 25,
Otherwise, the selector 22 to be supplied to the LAN-LLC processing unit 24
The transmission unit includes a multiplexing circuit 23 that multiplexes transmission packets from the LLC processing unit 24 and the LAPD processing unit 25 and sends the multiplexed packets to the LAN 1. On the other hand, the ISDN interface 4 has an address filter 41, a table circuit 42 for reading the value of the source address SA of the received packet and the TEI value of the packet, the MAC address of the packet frame is removed, and the LAP data unit is used as a D channel handler. (DH) 44 comprises a deassembler circuit 45 and a packet assembler 43 for assembling the LAPD data unit (configuration shown in FIG. 4 (a)) from the D channel handler 44 into the frame of FIG. 2 (a). It The DH44 shown in FIG. 1 has the ASP function shown in FIG.

Communication from the terminal 2 to the DH 44 will be described. LAPD processing section
25 transmits the packet frame obtained by adding the MAC address of the ISDN interface 4 to the data unit as the destination address DA and its own MAC address as the transmission address SA to the LAN 1 via the multiplexing circuit 23. This packet frame is supplied to the ISDN interface 4 via the bus 10. In the ISDN interface 4, it is supplied to the DH 44 via the address filter 41. Now, assuming that the TEI assigned to the terminal 2 is # 2 and the MAC address is m2, the packet from this terminal 2 has SA = m2 and TEI = # 2.
Based on this information, the table circuit 42 MACs TEI = # 2.
A table (TEI = # 2 → MAC address m2) corresponding to the address m2 is generated.

Next, the transmission from the ISDN interface 4 to the terminal 2 will be described. When the LAPD data unit with TEI = # 2 (frame structure shown in FIG. 4) is transmitted from the DH44,
The table circuit 42 generates a corresponding MAC address m2 based on TEI = # 2 of the data unit. The assembler circuit 43 that assembles the packet uses the MAC address m2 as the destination address DA and is pre-assigned to the source address SA.
The MAC address of the ISDN interface 4 is set, and the assembled packet frame is sent to LAN1. The terminal 2 receives this packet frame and supplies it to the LAPD processing unit 25 based on that the source address SA is the MAC address of the ISDN interface 4.

When two TEIs # 21 and # 22 are assigned to the terminal 2, the table circuit 42 receives the correspondence relationship of TEI = # 21 → MAC address m2 and TEI = # 22 → MAC address m2 under the same control in the received packet frame. Generated by. In this case, TEI = # 2
Both the data units from the DH 44 of 1 and # 22 are transferred in the packet frame of the destination address DA = m2, but the terminal 2 can identify them by referring to the TEI of the data unit. Further, even if the TEI of the terminal is changed, the table circuit 42 constantly checks and updates the correspondence between the TEI and the MAC address, so that a new procedure for notifying the table circuit 42 of the change of the TEI is not required.

The configuration and operation of the table circuit 42 will be described in detail with reference to FIG. The field extraction circuit 422 extracts the source address SA and the TEI value of the packet frame shown in FIG. 2 (a), and inputs the TEI to the memory 421 for writing the address (42-2).
Then, SA is supplied to the data input (42-1) for writing. Under this control, the memory 421 generates a target table (mapping table) for generating the corresponding MAC address from the TEI. The TE of the data unit (frame structure shown in FIG. 4A) sent from the DH (D channel handler) 44.
In the field extraction circuit 423, I is supplied to the address input (42-3) for reading of the memory 421 and corresponds to it.
The MAC address is output to the assembler circuit 43 from the read data output (42-4). The assembler circuit 43 is
The MAC address is used as the destination address DA, the source address SA is set to its own MAC address, and the packet frame shown in FIG. 2A is transmitted.

In the present invention, the terminal identifier (TEI) is taken as an example of the address of the data unit of the ISDN service, but this does not limit the scope of the present invention. For example, the TEI field and the SAPI field are put together. The present invention can be easily applied even when used as the address field. In addition, the present invention is based on the ISDN assigned to the terminal.
It is related to the management of the correspondence between addresses and LAN MAC addresses, and does not depend on the ISDN address allocation method.

(Effect of the invention) When connecting an ISDN system and a terminal via a LAN using a LAN-based packet frame for a LAPD data unit for ISDN communication, a new understanding of the correspondence relationship between the ISDN address and the LAN MAC address has been added. It can be realized without any special procedure.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 (a),
FIG. 4B is a diagram showing a packet frame, FIG. 3 is a diagram showing a configuration example of a table circuit, FIGS. 4A and 4B are ISDN.
FIG. 5 is a diagram showing a configuration of a LAPD data unit of FIG. 5, FIG. 5 is a diagram showing a TEI allocation procedure in ISDN, and FIG. 6 is a diagram showing a TEI allocation procedure when a LAN is used. In the figure, 1 is a LAN, 2 and 3 are terminals, 4 is an ISDN interface, 21 and 41 are address filters, 22 is a selector,
23 is a multiplexing circuit, 24 is an LLC processing unit, 25 is a LAPD processing unit, 42
Is a table circuit, 43 is an assembler circuit, 44 is a D channel handler, 10 is a bus, 421 is a memory, and 422 and 423 are field extraction circuits.

Claims (1)

[Claims] 1. A terminal and an ISDN system are connected to each other, and packet communication is performed using the terminal address and ISDN address assigned to the terminal and the ISDN system as packet destination information and sender information, and the terminal address and In an ISDN address management method for managing correspondence of the ISDN address, receiving a packet from the terminal to the ISDN system,
Using the sender information of the received packet received and the ISDN address of the LAPD data unit in the received packet to create an address comparison table between the terminal address and the ISDN address, when transmitting data from the ISDN system Is the LAPD
The address comparison table is searched based on the ISDN address of the data unit, the packet address information corresponding to the ISDN address is obtained, and the packet address information is set to the packet address information.
An ISDN address management method characterized by adding the destination information to a LAPD data unit and assembling and transmitting the packet signal.