Abstract: A graceful restart is provided in a NSF capable router. When a switchover to a standby controller is required, the standby controller receives replicated link state message headers from an active controller. The standby controller generates a link state request (LSR) message from the link state message headers and transmits the LSRs to neighboring routers. The standby controller receives a link state update that includes the link state messages. By using the LSRs, the standby controller can be quickly synchronized with its neighbors well within the grace period, thereby maintaining adjacency.

Abstract: A graceful restart is provided in a NSF capable router. When a switchover to a standby controller is required, the standby controller receives replicated link state message headers from an active controller. The standby controller generates a link state request (LSR) message from the link state message headers and transmits the LSRs to neighboring routers. The standby controller receives a link state update that includes the link state messages. By using the LSRs, the standby controller can be quickly synchronized with its neighbors well within the grace period, thereby maintaining adjacency.

Abstract: A technique for reducing reconvergence time by a reconverging device in a PIM-SM domain of a communication system involves sending by the reconverging device to a neighboring device a reconvergence message including a reconvergence indicator, such as a randomly selected Generation Identifier value. In response to the reconvergence message, the neighboring device sends to the reconverging device a PIM Bootstrap Message identifying the Rendezvous Point devices in the PIM-SM domain. The reconverging device creates the appropriate PIM-SM states for the Rendezvous Point devices. Additionally, the neighboring device sends to the reconverging device a PIM Join/Prune Message for each multicast group for which the neighboring device supports a downstream multicast group member. The reconverging device creates the appropriate routing entries for the multicast group memberships, and forwards each PIM Join/Prune Messages towards its corresponding Rendezvous Pointer device.