Abstract: A call handover method for an Internet Protocol communication network using hierarchical mobility management comprising a mobility anchor point connected to first and second access routers and to a home agent of a mobile node having first local and regional care-of addresses and communicating with another node consists in, if the mobile node detects the second access router: i) communicating the address prefix of the second access router to the mobile node in order for it to construct a second local care-of address, ii) communicating the second local care-of address, the first regional care-of address and an information bit having a value indicating double temporary addressing to the anchor point in order for it to store the second local care-of address in corresponding relationship to the first regional care-of address and then forward packets addressed to the mobile node to the first and second access routers, and iii) disconnecting the mobile node from the first access node and then deleting the first loca

Abstract: A router made up firstly of at least two router modules, only one of which is in an active state at any given time, and secondly a of changeover device making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, and the router modules having state machines associated with each of the neighbor routers, wherein each of the router modules has a data storage device which, in the active state, enables it to store data relating to the states of the state machines, when the machines are in stable states, and a data retrieval device for retrieving the data when the router module changes over to the active state.

Abstract: A forwarding engine of a router device may replace addresses of some IP packets by virtual ones such to mask the active routing daemon. This is used in unicast regime when said forwarding engine forwards incoming IP packets from neighbor routers to said routing daemon. It is also used in unicast as well as in multicast regime in the opposite case. A standby routing daemon may also be used on another processor by affecting same virtual addresses for its ports as the first active routing daemon. In a case of failure of the first active routing daemon, a controller will switch said standby routing daemon to be the new active daemon connected to the forwarding engine. A CompactPCI bus can be advantageously used. In that case, the forwarding engine is a peripheral board of the controller of that CompactPCI.

Abstract: The invention concerns a method of management of interworking between at least one wireless local area network and one mobile network comprising the following steps: in the case of a first handover, from the wireless local area network to the mobile network, of a communication session involving a mobile station, the communication session using, before the first handover, on the one hand an end-to-end tunnel between the mobile station and a TTG gateway and on the other hand a GTP tunnel between the TTG gateway and a GGSN node: replacement of the GTP tunnel between the TTG gateway and the GGSN node by a GTP tunnel between an SGSN node and the GGSN node; clearing down of the end-to-end tunnel between the mobile station and the TTG gateway; in the case of a second handover, from the mobile network to the wireless local area network, of a communication session involving a mobile station, the communication session using, before the second handover, a GTP tunnel between an SGSN node and a GGSN node, the method compr

Abstract: A router made up firstly of at least two router modules, only one of which is in an active state at any given time, and secondly a of changeover device making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, and the router modules having state machines associated with each of the neighbor routers, wherein each of the router modules has a data storage device which, in the active state, enables it to store data relating to the states of the state machines, when the machines are in stable states, and a data retrieval device for retrieving the data when the router module changes over to the active state.

Abstract: A router includes at least two router modules, one of which is in an active state at any given time, the others being in a standby state, and a changeover capability making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, each of the router modules having connections with one or more networks, and having at least one state machine, each state machine managing the interface associated with one of the connections. In the router, each of the router modules has data storage capability which, in the active state, enables it to store data relating to the state of the at least one state machine, when the machine is in a stable state, and data retrieval capability for retrieving the data when a changeover takes place.

Abstract: A router made up firstly of at least two router modules, only one of which is in an active state at any given time, and secondly of a changeover device making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, and the router modules having state machines associated with each of the neighbor routers, wherein each of the router modules has a data storage device which, in the active state, enables it to store data relating to the states of the state machines, when the machines are in stable states, and a data retrieval device for retrieving the data when the router module changes over to the active state.

Abstract: A call handover method for an Internet Protocol communication network using hierarchical mobility management comprising a mobility anchor point connected to first and second access routers and to a home agent of a mobile node having first local and regional care-of addresses and communicating with another node consists in, if the mobile node detects the second access router: i) communicating the address prefix of the second access router to the mobile node in order for it to construct a second local care-of address, ii) communicating the second local care-of address, the first regional care-of address and an information bit having a value indicating double temporary addressing to the anchor point in order for it to store the second local care-of address in corresponding relationship to the first regional care-of address and then forward packets addressed to the mobile node to the first and second access routers, and iii) disconnecting the mobile node from the first access node and then deleting the first loca

Abstract: A call handover method for an Internet Protocol (IP) communication network using hierarchical routing comprising first and second mobility anchor points (P1, P2) connected to respective first and second access routers (R1, R2) and a home agent (EA) of a mobile first node (T1) communicating with a second node (T2) consists in, when the mobile first node (T1) detects the second access router (R2): i) determining the address prefix of the second access router (R2) in order to communicate it to the mobile first node (T1) in order for the latter to construct additional local and regional care-of addresses, ii) communicating the additional local care-of address to the first anchor point (P1) in order for it to set up a temporary tunnel (TU) to the second access router (R2) in order to forward packets addressed to the mobile first node (T1) to the second access router (R2), iii) connecting the mobile first node (T1) to the second access router (R2) in order to forward to it the packets received via the temporary tun

Abstract: The invention provides a high availability control method for a router in an autonomous system, the router being in communication with other routers using an IS—IS protocol via interfaces and presenting both an active IS—IS protocol engine and a standby IS—IS protocol engine. The method comprises steps of storing data concerning adjacency, the state of links, and interfaces in a memory of the active protocol engine, updating the data stored in a memory of the standby protocol engine, and activating the standby protocol engine using the updated data. The invention also provides a router implementing the method. The invention serves to increase router availability in the event of a failure or of maintenance actions.

Abstract: A router (R) for a distributed routing communications network includes i) a database (BD1-BD3) containing data representing states of links between routers of the network, ii) calculation means (MC) adapted to determine routes from the data and to update distributed routing tables as a function of the determined routes, and iii) management means (MG) adapted, in the event of local reception or transmission of an LSA or a TE-LSA at a time TAL(R), to determine the elapsed time (T_e) from the reception or transmission of the last instance of the LSA or the TE-LSA in order to compare it to a selected threshold and either to await the expiry of a current calculation delay (OPC) in the presence of a TE-LSA or to trigger a stabilization delay of selected duration and the starting time TAL(R) of which serves to resynchronize the expiry time of the current calculation delay to a selected time in the presence of a bursty TE-LSA, so as to instruct the calculation means (MC), after expiry of the calculation delay, to det

Abstract: The invention concerns a mobile device comprising communication means for transmitting data packets to other mobile devices within a first cluster within a mobile communication network, which also includes: Detection means (DM) for detecting a new mobile device belonging to a second cluster, Election means (EM) for determining whether this new device should or should not be added to the membership of an inter-cluster subnetwork, Second routing means (RM2) for transmitting routing information between the devices that are members of the inter-cluster subnetwork, Communication means (CM) for exchanging routing information between the first and second routing means.

Abstract: An apparatus for managing a mobility protocol for an equipment of an Internet protocol communication network comprises first management means adapted to operate a core of an IP mobility protocol installed in the equipment as a function of current data relating to IP mobility and second management means which are substantially identical to and coupled to the first management means and are adapted to assume an active state, respectively a standby state, when the second management means assume a standby state, respectively an active state. The first and second management means send each other at least some of the current data so that the means in the standby state are substituted for the means in the active state, if required, to operate the mobility protocol core.

Abstract: A forwarding engine of a router device may replace addresses of some IP packets by virtual ones such to mask the active routing daemon. This is used in unicast regime when said forwarding engine forwards incoming IP packets from neighbor routers to said routing daemon. It is also used in unicast as well as in multicast regime in the opposite case. A standby routing daemon may also be used on another processor by affecting same virtual addresses for its ports as the first active routing daemon. In a case of failure of the first active routing daemon, a controller will switch said standby routing daemon to be the new active daemon connected to the forwarding engine. A CompactPCI bus can be advantageously used. In that case, the forwarding engine is a peripheral board of the controller of that CompactPCI.

Abstract: The invention provides a high availability control method for a router in an autonomous system, the router being in communication with other routers using an IS-IS protocol via interfaces and presenting both an active IS-IS protocol engine and a standby IS-IS protocol engine. The method comprises steps of storing data concerning adjacency, the state of links, and interfaces in a memory of the active protocol engine, updating the data stored in a memory of the standby protocol engine, and activating the standby protocol engine using the updated data. The invention also provides a router implementing the method. The invention serves to increase router availability in the event of a failure or of maintenance actions.

Abstract: A system for routing between autonomous systems connected to peer routers, the system comprising, for each peer router, two routing modules enabling routing to be performed between autonomous systems, only one of the modules being in an active state at any given instant, the others being in a standby state, and means enabling one of said other routing modules to switch from a standby state to an active state in the event of the routing module that is in the active state stopping.

Abstract: A router made up firstly of at least two router modules, only one of which is in an active state at any given time, the others being in a standby state, and secondly of changeover means making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, each of the router modules having connections with one or more networks, and having at least one state machine, each state machine managing the interface associated with one of the connections. In the router, each of the router modules has data storage means which, in the active state, enable it to store data relating to the state of said at least one state machine, when said machine is in a stable state, and data retrieval means for retrieving said data when a changeover takes place.

Abstract: A router made up firstly of at least two router modules, only one of which is in an active state at any given time, and secondly of changeover means making it possible to cause one of the other router modules to go from a standby state to an active state when the router module in the active state stops, and the router modules having state machines associated with each of the neighbor routers, wherein each of the router modules has data storage means which, in the active state, enable it to store data relating to the states of the state machines, when said machines are in stable states, and data retrieval means for retrieving said data when the router module changes over to the active state.