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1. 发明专利

JPH1032575A VIRTUAL ATM CONNECTION CHANGEOVER METHOD 失效
公开(公告)号：JPH1032575A
公开(公告)日：1998-02-03
申请号：JP18441196
申请日：1996-07-15
申请人： HITACHI LTD , HITACHI JOHO NETWORK KK , HITACHI SOFTWARE ENG
发明人： MORIKAWA SHINGO , MOCHIZUKI KIYOSHI , KIMOTO ATSUSHI
IPC分类号： H04Q3/00 , H04L12/28
摘要： PROBLEM TO BE SOLVED: To provide a virtual ATM connection changeover method by which the load on the user is relieved by eliminating the need for setting configuration definition information relating to bypass the virtual call (VC) and a dynamic change in a network is quickly coped with. SOLUTION: A bypass route with respect to the VC is retrieved based on network topology information from another equipment connected at a changeover request issue side, a connection request message is issued to a bypass route destination by using a signaling channel, a bypass route repeater analyzes a signaling message exchange and connection request message to set the VC in its own equipment and to transfer the signaling message to a succeeding equipment. Thus, the bypass relay VC is set and a connection request message including bypass information is transferred to the succeeding equipment, a bypass route terminator analyzes the connection request message including the bypass information and selects the VC of the bypass object to realize the changeover of the VC.

2. 发明专利

JPH0490237A CHANGEOVER SYSTEM FOR PACKET EXCHANGE 失效
公开(公告)号：JPH0490237A
公开(公告)日：1992-03-24
申请号：JP20257090
申请日：1990-08-01
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： AKIYAMA MINORU , KIMOTO ATSUSHI , SUZUKI MICHIO
IPC分类号： H04L1/22 , H04L12/70
摘要： PURPOSE:To prevent an interrupt of a call and to continue the communication at changeover by devising the system such that a processor of a standby packet exchange processing unit accesses directly a memory of an active packet exchange processing unit via a selector through the use of a line exclusive for memory. CONSTITUTION:When any effect is imposed on a memory 3a in the case of excluding a switching cause, a system configuration controller 7 sends a memory copy command 20 to a processor 2z in a standby packet exchange processing unit. The processor 2z in the standby packet exchange processing unit 1z sends a copy start command to a selector 4z. The selector 4z uses a line 6a exclusive for a memory to start high speed copying 22 of information from a memory 3a in an active packet exchange processor to a memory 3z of a standby packet exchange processor. When the copying 22 of the information is finished, the selector 4z in the standby packet exchange processor sends a copy end notice 23 to the processor 2z, which sends a complete changeover enable notice 25 to the system configuration controller 7.

3. 发明专利

JPH0433441A DETOUR SYSTEM FOR PACKET SWITCHING NETWORK 失效
公开(公告)号：JPH0433441A
公开(公告)日：1992-02-04
申请号：JP13830990
申请日：1990-05-30
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： KIMOTO ATSUSHI , SAKAI HIROSHIGE , SUZUKI MICHIO , IKEDA MASASHI
IPC分类号： H04L12/705
摘要： PURPOSE:To reduce a transfer delay time in a packet switching network due to occurrence of a ping pong phenomenon by bypassing a ping pong occurrence path for a succeeding packet when the ping pong phenomenon takes place and sending the packet to another relay path. CONSTITUTION:When a node A sends a packet 1 to a node F via a node B, a node C is going to interrupt a reception packet to the node F via a relay line (f), since the relay line (f) is faulty, '1' is added to number of relay 3 in the packet 1 and sends back the packet 1 to the node B. The node B reference a ping pong return flag 2 of the packet 1 to detect the occurrence of a ping pong phenomenon, then the relay transmission to the node C relating to a packet to the node F is inhibited on a routing table, '1' is added to number of relay 3 in the packet 1 and the packet 1 is sent to a node E via a relay line (b). Thus, the packet 1 is delivered to the node F being a destination via the node E. Thus, the packet transfer delay time in a packet switching network is reduced.

4. 发明专利

JPH0232643A RELAY LOOP DETOURING SYSTEM FOR PACKET SWITCHING NETWORK 失效
公开(公告)号：JPH0232643A
公开(公告)日：1990-02-02
申请号：JP18272288
申请日：1988-07-21
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： KIMOTO ATSUSHI , SUZUKI MICHIO , IKEDA MASASHI
IPC分类号： H04L12/24 , H04L12/705 , H04L29/14
摘要： PURPOSE:To enable communication to be continued by transmitting a relay loop detecting packet, judging the generation of a relay loop by the return of the packet, and informing a detour to another relay route to each node by transmitting a relay loop information packet. CONSTITUTION:A certain relay node transmits the relay loop detecting packet 2 at the time of generating the excess of the number of times of relay or a residence time. When the realy loop is detected by the return of the packet after the circulation of the relay loop, the relay loop information packet 3 is transmitted to all the nodes (A-F) of the relay loop, and transmission to the relay route which becomes the relay loop is prohibited at each node. In such a way, since a following packet detours the relay loop and performs the transmission to another relay route, the communication can be continued.

5. 发明专利

JPH0514342A PACKET MULTIPLE ADDRESS COMMUNICATION SYSTEM 失效
公开(公告)号：JPH0514342A
公开(公告)日：1993-01-22
申请号：JP18693291
申请日：1991-07-02
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： KIMOTO ATSUSHI , SUZUKI MICHIO , YAMAGUCHI KOICHIRO
IPC分类号： H04L12/18
摘要： PURPOSE:To realize the flexible system with high expansion performance in which multiple address communication is implemented to lots of multiple address communication destinations in a short time without imposition of a load onto a relay traffic. CONSTITUTION:A master multiple address communication equipment MB and slave multiple address communication equipments SB1-SB3 are installed to a packet exchange system comprising packet exchange stations P1-P4. A terminal equipment receiving a call connection request, that is, the master multiple address communication equipment registers automatically the slave multiple address communication equipments and each of the slave multiple address communication equipments automatically registers a terminal equipment connecting to a same packet exchange station among SYNC terminal equipments SK1-SK6. Each multiple address communication equipment copies the content of a received data packet to a transmission buffer having 7 planes and sends it to the registered multiple address communication destination.

6. 发明专利

JPH04207437A INTER-NETWORK ROUTING CONTROL SYSTEM 失效
公开(公告)号：JPH04207437A
公开(公告)日：1992-07-29
申请号：JP33071090
申请日：1990-11-30
申请人： HITACHI LTD , HITACHI SOFTWARE ENG
发明人： KIMOTO ATSUSHI , SUZUKI MICHIO , SAKAI HIROSHIGE
IPC分类号： H04L12/46
摘要： PURPOSE:To relieve the load of an exchange station by implementing gate station selection processing at inter-network connection and connection request transfer processing at busy state of the gate station by the gate station. CONSTITUTION:Exchange stations P1-P3 receiving a call request of inter-network connection from a terminal equipment T1 reference an inter-network connection routing table, select a representative gate station corresponding to a called destination network address in a called address and transfer a call request to the representative gate station, e.g. G1. The representative gate station G1 receiving the call request references a selection table of the gate station to uniformize a load between gate stations G1 and G2 to select an optimum gate station and retransfers the call request to an optimum gate station, e.g. G2. In order to uniformize the load among inter-network lines L11-L14, the optimum gate station G2 references a line selection table to select an optimum inter- network line. Thus, the load of the exchange station is relieved.

7. 发明专利

JPH08316993A METHOD FOR CONNECTING INTER-NETWORK CORRESPONDING TO TRAFFIC CONTROL FUNCTION AND REPEATER 失效
公开(公告)号：JPH08316993A
公开(公告)日：1996-11-29
申请号：JP12337895
申请日：1995-05-23
申请人： HITACHI LTD
发明人： SAWADA SUNAO , KIMOTO ATSUSHI , OURA TETSUO
IPC分类号： H04Q3/00 , H04L12/28 , H04L12/46 , H04L12/66
摘要： PURPOSE: To reduce the abolition of a frame and the generation of delay by transmitting the frame to the present station to the network connected with an other network interface and preventing the transmission of the other station when one network congests. CONSTITUTION: When a repeater 1 receives a control cell 133 in which a transmission possible rate is 4 to be less than threshold, a jam transmission is started on a transmission line 102 and the transmission of a CSMA/CD(carrier sense multiple access/collision detector) terminal 150 is prevented. Because the jam is transmitted on the transmission line 102 even if data 142 to be transmitted exists at this time, a terminal 150 is not capable of transmitting a frame. When the frame can not be transmitted, retries are performed at random time interval but while the jam is transmitted, the transmission of the frame can not be performed. The repeater 1 continues the jam transmission because the both of the transmission possible rates of continuously received control cells 134 and 135 are less than threshold and stops the jam transmission at a point of time of receiving a cell 136 having a transmission possible rate to be threshold or more, and the transmission of data 142 becomes possible.

8. 发明专利

JP2002290441A IP-VPN ROUTER AND METHOD FOR AUTOMATICALLY SETTING PACKET TRANSFER PATH FOR IP-VPN 失效
公开(公告)号：JP2002290441A
公开(公告)日：2002-10-04
申请号：JP2001086270
申请日：2001-03-23
申请人： HITACHI LTD
发明人： FUJITANI DAISUKE , TARUYA KATSUHIKO , ARAI MASAYA , KIMOTO ATSUSHI , TAKEMICHI YUSUKE , ONISHI HISASHI
IPC分类号： H04L12/70 , H04L12/755 , H04L12/56
摘要： PROBLEM TO BE SOLVED: To allow respective IP(Internet Protocol)-VPN(Virtual Private Network) routers to establish and control a packet transfer path for VPN on an autonomous and distributed basis when constructing the VPN on an IP network, and to reduce the load on a network manager or a network managing function. SOLUTION: When an IP-VPN router has a new additional terminal, the IP-VPN router reports additional information of the additional terminal to all other IP-VPN routers. When an IP-VPN router receives a report, the IP-VPN router checks whether a packet transfer path for VPN, which corresponds to the VPN that the new terminal belongs to, is established with the IP-VPN router as a sender of the report. If not established, the IP-VPN router as a receiver of the report establishes a packet transfer path for VPN, which corresponds to the VPN that the additional terminal to the IP-VPN router as the sender of the report belongs to, with the IP-VPN router as the sender of the report.

9. 发明专利

JPH0818569A CONGESTION CONTROL METHOD AND ATM EXCHANGE 失效
公开(公告)号：JPH0818569A
公开(公告)日：1996-01-19
申请号：JP15327594
申请日：1994-07-05
申请人： HITACHI LTD
发明人： SAKATA YOSHIHIKO , NOZAKI ISAO , KIMOTO ATSUSHI , YAMAMURA YOSHINORI , ENDO YOICHI
IPC分类号： H04Q3/00 , H04L12/28
摘要： PURPOSE:To reduce a cell abort rate by congestion by controlling a cell transmission speed with an ATM terminator or an ATM exchange depending on a congestion level in an ATM (asynchronous transfer mode) network system. CONSTITUTION:When an ATM exchange 3 detects congestion, a 1st level congestion OAM cell is sent to an ATM terminator 21 being a cause to the congestion and the ATM terminator 21 reduces a cell transmission speed. When the exchange 3 detects congestion of a heavy degree, the exchange 3 sends a 2nd level congestion OAM cell to the ATM exchange 1 being a cause to congestion, and the ATM exchange 1 reduces the cell transmission speed and converts the OAM cell into a 1st level congestion OAM cell and sends it to the ATM terminator 21 being a cause to congestion.

10. 发明专利

JP2005354362A Network repeater and its controlling method 有权
标题翻译：网络中继器及其控制方法
公开(公告)号：JP2005354362A
公开(公告)日：2005-12-22
申请号：JP2004172451
申请日：2004-06-10
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： KITANI MAKOTO , WATANUKI TATSUYA , YAMATE KEIICHIRO , KIMOTO ATSUSHI
IPC分类号： H04L12/46 , H04L12/26
CPC分类号： H04L49/1523 , H04L49/55
摘要： PROBLEM TO BE SOLVED: To prevent the generation of a loop in a network by evading a double-master state. SOLUTION: Since an operation state is switched through a back-up (master stand-by) state in the case of switching the operation state from a back-up state to a master state by an L2 switch 100, the operation state of an L2 switch 200 making a pair with the L2 switch 100 is transitionally switched to a master state after confirming that the operation state is in the back-up state. COPYRIGHT: (C)2006,JPO&NCIPI

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