WO2006012968A1 - Method and switching system for switching over from a master computer system to a standby computer system - Google Patents
Method and switching system for switching over from a master computer system to a standby computer system Download PDFInfo
- Publication number
- WO2006012968A1 WO2006012968A1 PCT/EP2005/007350 EP2005007350W WO2006012968A1 WO 2006012968 A1 WO2006012968 A1 WO 2006012968A1 EP 2005007350 W EP2005007350 W EP 2005007350W WO 2006012968 A1 WO2006012968 A1 WO 2006012968A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- computer system
- control messages
- stored
- port identification
- standby
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/58—Association of routers
- H04L45/586—Association of routers of virtual routers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/60—Software-defined switches
- H04L49/602—Multilayer or multiprotocol switching, e.g. IP switching
Definitions
- the present invention relates to a method and switching system for switching over from a master computer system to a standby computer system
- This invention may particularly be used in a LAN environment.
- IP Ethernet networks simple terminals such as PCs or telephones for example as a rule have a single static gateway entry in the form of an IP address (IP address of the router) . If the terminals wish to send IP packets to IP addresses which lie outside their own sub network, they must send the IP packets in the Ethernet environment (also: Token Ring, FDDI) to the MAC address of the gateway. So that a failure of the gateway does not result in the terminals becoming completely decoupled from the rest of the world, redundant gateways are used which behave as a single gateway from the standpoint of the terminal. For this to be done the two gateways must agree as to which one assumes the active role.
- IP address of the router IP address of the router
- VRRP Virtual Router Redundancy Protocol
- HSRP Hot Standby Router Protocol
- RFC 2338 IETF Network Working Group: S. Knight, D. Weaver Ascend Communications, Inc., D. Whipple Microsoft, Inc., R. Hinden, D. Mitzel, P. Hunt Nokia, P. Higginson, M. Shand Digital Equipment Corp., A. Lindem IBM Corporation, April 1998) and RFC 2281 (IETF Network Working Group: S. Knight, D. Weaver Ascend Communications, Inc., D. Whipple Microsoft, Inc., R. Hinden, D. Mitzel, P. Hunt Nokia, P. Higginson, M. Shand Digital Equipment Corp., A. Lindem IBM Corporation, April 1998) and RFC 2281 (IETF Network Working Group: S. Knight, D. Weaver Ascend Communications, Inc., D. Whipple Microsoft, Inc., R. Hinden, D. Mitzel, P. Hunt Nokia, P. Higginson, M. Shand Digital Equipment Corp., A. Lin
- the active router sends out "hello” control messages periodically.
- the standby router (computer system) listens to the "hello” control messages. If a certain number of "hello” control messages do not arrive at the standby router, the standby router works on the assumption that the active router is no longer present and takes over the role of the active router. If with HSRP the times specified in RFC2281 are adhered to then the switchover time on failure of the active router is 10 seconds (recommended Holdtime) . With VRRP the value is slightly over 3 seconds (more precisely (3* advertisement_interval) + Skew__time,- default for advertisement_interval is one second, Skew time is (256 - priority) /256, which means it is between 1/256 second and 1 second) .
- the present invention aims to minimize the service downtime, if the active router fails.
- a main aspect of the invention is a method to switch over from a master computer system to a standby computer system via an intermediate switching system comprising the steps of: - receiving control messages from the master computer (MRl) system,
- the stored control messages can be passed through without any changes to the standby computer (BRl) system in the case that no link down condition is detected on the stored ingress port ID.
- Bl standby computer
- a further aspect of the invention is a switching system to perform the above mentioned method comprising:
- the proposed invention provides the following advantages:
- the standby computer system instantaneously assumes the active role if the Master Router or its Ethernet network card is defective and it thus has no further opportunity of sending a "hello" control message with a priority of 0. If the active computer system fails, the service downtime is minimized from a range of a few seconds to a value of a few milliseconds.
- the Figure is a schematic network diagram from RFC2238.
- the Figure depicts Host computers Hl, H2, H3, H4 which are connected via default routers IP A to a OSI-Layer-2 switching system L2 Switch. Furthermore there is a Master router (computer system) MRl and a Standby or Backup Router
- MRl and BRl signifies the IP Address, e.g. IP A, IP B.
- the L2 switching system sends a "hello" control message to the Backup router BRl with the same contents as the periodic "hello" control messages of Master Router MRl, but with the priority 0.
- VRRP priorities 0 has a special significance: it indicates that the master router withdraws in an orderly manner. After receiving packets of this type the Backup Router immediately assumes the active role and must not wait for a timeout.
- the priority 0 does not have the same significance and it is necessary for the Standby router to operate in "pre-empt" mode. In “pre-empt” mode the Standby router assumes the active role if it notices that the previously active router has been given a lower priority than it has itself.
- Layer 2 switching system equipped with this capability must read the "hello" control messages sent by the Master Router or Computer System and store their contents in its memory. It must also detect and store a record of the Ethernet port ID of the receiving Ethernet port (in most cases this will be the port.
- the Master router is attached to,- however, other topologies with intermediate Layer 2 switching systems between ingress port and master Router are also possible) As an example, how to determine the associated ingress port ID, the Layer 2 switching system can read the source MAC address of the "hello" control message frame and map it to the Ethernet port ID by looking up the MAC-address in the MAC address table, and store the port ID information found there in memory.
- the Layer 2 switching system prepends a label, which contains information of the ingress port ID, when receiving the frame. As long as the Layer 2 switching system detects, that the links state of the stored port ID is up, then all received hellos are flooded to all other ports of the same VLAN unchanged. However, if the Layer 2 switching detects a transition of the port state to "link down", it immediately sends a "hello” control message to all other ports of the same VLAN, but with priority set to zero (0) . The Backup router receives this "hello" control frame and immediately takes over the service.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0417215A GB2416875A (en) | 2004-08-03 | 2004-08-03 | Switching from master computer system to standby computer system |
GB0417215.1 | 2004-08-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006012968A1 true WO2006012968A1 (en) | 2006-02-09 |
Family
ID=32947865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/007350 WO2006012968A1 (en) | 2004-08-03 | 2005-07-07 | Method and switching system for switching over from a master computer system to a standby computer system |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2416875A (en) |
WO (1) | WO2006012968A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103552945A (en) * | 2013-11-08 | 2014-02-05 | 太原市风行测控技术有限公司 | Redundancy intelligent main command controlling device for hoisting equipment |
CN103581057A (en) * | 2012-07-24 | 2014-02-12 | 中兴通讯股份有限公司 | Message control method, system and nodes in aggregation link switching |
CN109039921A (en) * | 2018-08-23 | 2018-12-18 | 迈普通信技术股份有限公司 | A kind of Designated Router switching method, multicast router and multicast network |
TWI697224B (en) * | 2018-10-29 | 2020-06-21 | 日商三菱電機股份有限公司 | Communication system, communication device and computer program pruduct |
CN113794541A (en) * | 2021-08-27 | 2021-12-14 | 新华三信息安全技术有限公司 | Main/standby switching management method, device, equipment and machine readable storage medium |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101150478B (en) * | 2007-10-22 | 2010-08-25 | 华为技术有限公司 | A method, system and router for establishing master/slave link |
EP2395713A4 (en) * | 2009-02-09 | 2014-12-31 | Nec Corp | Communication system, communication device, control device, control method, and program |
JP5691248B2 (en) * | 2010-05-28 | 2015-04-01 | 富士通株式会社 | Task takeover program, processing device, and computer system |
CN104579953B (en) * | 2013-10-09 | 2018-05-22 | 中国移动通信集团广东有限公司 | A kind of method, Virtual Router Redundancy Protocol backup group and network for issuing routing |
CN104780097B (en) * | 2014-01-15 | 2017-12-22 | 中国联合网络通信集团有限公司 | Hot spare method and first routing device under non-fully-connected network topological condition |
CN104780098B (en) * | 2014-01-15 | 2017-12-22 | 中国联合网络通信集团有限公司 | Hot spare method and Centralized Controller under non-fully-connected network topological condition |
Citations (4)
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US5473599A (en) * | 1994-04-22 | 1995-12-05 | Cisco Systems, Incorporated | Standby router protocol |
US5963540A (en) * | 1997-12-19 | 1999-10-05 | Holontech Corporation | Router pooling in a network flowswitch |
EP1006702A2 (en) * | 1998-12-04 | 2000-06-07 | Nortel Networks Corporation | Method and apparatus providing for an improved VRRP (Virtual Router Redundancy Protocol) |
WO2004028102A1 (en) * | 2002-09-19 | 2004-04-01 | Cisco Technology, Inc | Ip redundancy with improved failover notification |
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US6195705B1 (en) * | 1998-06-30 | 2001-02-27 | Cisco Technology, Inc. | Mobile IP mobility agent standby protocol |
JP3956685B2 (en) * | 2001-05-31 | 2007-08-08 | 古河電気工業株式会社 | Network connection method, virtual network connection device, and network connection system using the device |
JP2004146989A (en) * | 2002-10-23 | 2004-05-20 | Fujikura Ltd | Router system |
US7636364B2 (en) * | 2002-10-31 | 2009-12-22 | Force 10 Networks, Inc. | Redundant router network |
-
2004
- 2004-08-03 GB GB0417215A patent/GB2416875A/en not_active Withdrawn
-
2005
- 2005-07-07 WO PCT/EP2005/007350 patent/WO2006012968A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US5473599A (en) * | 1994-04-22 | 1995-12-05 | Cisco Systems, Incorporated | Standby router protocol |
US5963540A (en) * | 1997-12-19 | 1999-10-05 | Holontech Corporation | Router pooling in a network flowswitch |
EP1006702A2 (en) * | 1998-12-04 | 2000-06-07 | Nortel Networks Corporation | Method and apparatus providing for an improved VRRP (Virtual Router Redundancy Protocol) |
WO2004028102A1 (en) * | 2002-09-19 | 2004-04-01 | Cisco Technology, Inc | Ip redundancy with improved failover notification |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103581057A (en) * | 2012-07-24 | 2014-02-12 | 中兴通讯股份有限公司 | Message control method, system and nodes in aggregation link switching |
CN103552945A (en) * | 2013-11-08 | 2014-02-05 | 太原市风行测控技术有限公司 | Redundancy intelligent main command controlling device for hoisting equipment |
CN109039921A (en) * | 2018-08-23 | 2018-12-18 | 迈普通信技术股份有限公司 | A kind of Designated Router switching method, multicast router and multicast network |
TWI697224B (en) * | 2018-10-29 | 2020-06-21 | 日商三菱電機股份有限公司 | Communication system, communication device and computer program pruduct |
CN113794541A (en) * | 2021-08-27 | 2021-12-14 | 新华三信息安全技术有限公司 | Main/standby switching management method, device, equipment and machine readable storage medium |
Also Published As
Publication number | Publication date |
---|---|
GB2416875A (en) | 2006-02-08 |
GB0417215D0 (en) | 2004-09-01 |
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