| 摘要 |
PURPOSE: A protection switching method in an Ethernet ring network is provided to selectively flush a Filtering DataBase (FDB) or to partially flush the address of an FDB in the case of a failure in an Ethernet ring by considering whether the link where the failure occurs influences data transmission. CONSTITUTION: A first node in a ring network detects a link failure (110). The first node determines whether a port which transmits a protection switching message is a port on a forwarding path (120). The first node generates a protection switching message based on the determination (130, 140). If the port is not on the forwarding path, the first node sets a Do Not Flush (DNF) bit of the protection switching message. The first node transmits the generated protection switching message (150). [Reference numerals] (110) Node detects a link failure; (120) Node determines whether a port which transmits a protection switching message is a port on a forwarding path; (130) Node generates a protection switching message by setting up a DNF bit value; (140) Node generates a protection switching message without setting up a DNF bit value; (150) Node transmits the generated protection switching message to neighboring nodes; (160) Neighboring node receives the protection switching message and checks the DNF value; (170) Address corresponding to a port received by a filtering database is flushed; (180) Is the current node is the final node ?; (AA) Start; (BB,GG,HH) No; (CC) Is the port on the forwarding path ?; (DD,FF,II) Yes; (EE) Has a DNF bit been set ?; (JJ) End |
