Patent ID: 8000231
Filing Date: 2011-08-16
Classification: H04L

Abstract:
1. A method for a network device to access a packet switched network, wherein the method is applied to a system in which the network device accesses the packet switched network by connecting to Provider Edge Routers (PEs) in an active-standby mode, and the method comprises: sending, by an active PE a fault detection message to the network device through the active PE's interface connected to the network device; sending, by an standby PE a fault detection message to the network device through the standby PE's interface connected to the network device; setting, by the active PE, a state of the active PE's interface connected to the network device to “up” and advertising a first route to a remote PE if determining that a fault detection response is received through the active PE's interface connected to the network device within a preset period; setting the state of the active PE's interface connected to the network device to “down”, and withdrawing the first route advertised to the remote PE if determining that a fault detection response is not received through the active PE's interface connected to the network device within the preset period; and setting, by the standby PE, the state of the standby PE's interface to “up” and advertising a second route to the remote PE after receiving the fault detection response through the standby PE's interface connected to the network device.