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1. WO1995029544 - STANDBY ROUTER PROTOCOL

Publication Number WO/1995/029544
Publication Date 02.11.1995
International Application No. PCT/US1995/004887
International Filing Date 21.04.1995
Chapter 2 Demand Filed 09.11.1995
IPC
G06F 11/20 2006.1
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
11Error detection; Error correction; Monitoring
07Responding to the occurrence of a fault, e.g. fault tolerance
16Error detection or correction of the data by redundancy in hardware
20using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
H04L 12/56 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
54Store-and-forward switching systems
56Packet switching systems
H04L 29/14 2006.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
29Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/-H04L27/136
14Counter-measures to a fault
CPC
G06F 11/2005
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
11Error detection; Error correction; Monitoring
07Responding to the occurrence of a fault, e.g. fault tolerance
16Error detection or correction of the data by redundancy in hardware
20using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
2002where interconnections or communication control functionality are redundant
2005using redundant communication controllers
G06F 2201/815
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
2201Indexing scheme relating to error detection, to error correction, and to monitoring
815Virtual
H04L 43/0817
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
43Arrangements for monitoring or testing packet switching networks
08Monitoring based on specific metrics
0805Availability
0817functioning
H04L 45/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
45Routing or path finding of packets in data switching networks
H04L 45/28
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
45Routing or path finding of packets in data switching networks
28Route fault recovery
H04L 45/58
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
45Routing or path finding of packets in data switching networks
58Association of routers
Applicants
  • CISCO SYSTEMS, INC. [US]/[US] (AllExceptUS)
  • LI, Anthony, Joseph [US]/[US] (UsOnly)
  • COLE, Bruce, A. [US]/[US] (UsOnly)
Inventors
  • LI, Anthony, Joseph
  • COLE, Bruce, A.
Agents
  • WEAVER, Jeffrey, K.
Priority Data
08/231,33022.04.1994US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) STANDBY ROUTER PROTOCOL
(FR) PROTOCOLE DE ROUTEUR DE SECOURS
Abstract
(EN) A system and protocol are provided for routing data packets from a host (H2) on a LAN (L) through a virtual address (R4) belonging to a group or routers (126). The host (H2) is configured to point to the virtual address (R4) so that the packets it sends out of its LAN are always directed to a virtual router which may be any one of the group of routers (126). An active router (R5) in the group of routers emulates the virtual router (R4). A standby router (R6), also from the group of routers (126), backs up the active router (R5) so that if the active router becomes inoperative, the standby router (R6) automatically begins emulating the virtual router. The host (H2) does not know which router from the group (126) is actually handling the data packets it sends. If the standby router (R6) becomes inoperative or takes over for the active router, other routers in the group (126) hold an election to determine which of them should take over for the standby router.
(FR) L'invention concerne un système et un protocole d'acheminement de paquets de données depuis un ordinateur central (H2) sur un réseau local LAN (L) par l'intermédiaire d'une adresse virtuelle (R4) appartenant à un groupe de routeurs (126). L'ordinateur central (H2) est conçu pour désigner l'adresse virtuelle (R4), de telle façon que les paquets qu'il envoie hors de son réseau local LAN sont toujours dirigés vers un routeur virtuel, qui peut être tout routeur parmi le groupe de routeurs (126). Un routeur actif (R5) du groupe de routeurs émule le routeur virtuel (R4). Un routeur de secours (R6), faisant également partie du groupe de routeurs (126), assiste le routeur actif (R5), de telle manière que, si celui-ci devient inopérationnel, le routeur de secours (R6) déclenche automatiquement l'émulation du routeur virtuel. L'ordinateur central (H2) ne sait pas quel est le routeur du groupe (126) qui traite réellement les paquets de données qu'il envoie. Si le routeur de secours (R6) devient non opérationnel ou prend la relève du routeur actif, d'autres routeurs du groupe (126) élisent celui qui devrait prendre la relève du routeur de secours.
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