Abstract: A packet transmission network, a plurality of routers have sessions among them based on a routing protocol to exchange routing and/or connectivity data indicating paths for transmitting packets over the network. Each router maintains a first routing table including data sent to another of said routers, and a second routing table including data received from another of said routers. To close at least part of the sessions of a given router, the method consists: in listing the data corresponding to the part of the sessions and contained in at least one of the first and second routing tables; sending an updating message based on the protocol indicating to neighboring routers that the paths indicated in the data are considered out-of-service; then closing the part of the sessions. The router continues transmitting packets emitted on the paths considered out-of-service until the closing step.

Abstract: A packet transmission network, a plurality of routers have sessions among them based on a routing protocol to exchange routing and/or connectivity data indicating paths for transmitting packets over the network. Each router maintains a first routing table including data sent to another of said routers, and a second routing table including data received from another of said routers. To close at least part of the sessions of a given router, the method consists: in listing the data corresponding to the part of the sessions and contained in at least one of the first and second routing tables; sending an updating message based on the protocol indicating to neighbouring routers that the paths indicated in the data are considered out-of-service; then closing the part of the sessions. The router continues transmitting packets emitted on the paths considered out-of-service until the closing step.

Abstract: An operation of a packet communication network is monitored through packets addressed to or transmitted by a control unit of a router pertaining to the communication network. Therefore, a collecting module can be connected to a link of the communication network so as to collect packets corresponding to second packets transferred at an interface between a routing unit and a control unit of a router. The collected packets are selected, then a content and coordinates of the selected packets are sent to a recording unit. In a preferred embodiment, the collecting unit is integrated within the router and the recording unit is connected to the communication network remotely from the router containing the collecting unit.