3Com Switch 7750 SeriesCommand Reference Guide – Routing Protocol Chapter 4 Integrated IS-IS Configuration Commands4-244.1.26 isis timer holding-multiplierSyntaxisis timer holding-multiplier value [ level-1 | level-2 ]undo isis timer holding-multiplier [ level-1 | level-2 ]ViewInterface viewParametervalue: Number of invalid Hello packets of an IS-IS neighbor, in the range of 3 to 1,000.level-1: Specifies the number of invalid Hello packets of a Level-1 IS-IS neighbor.level-2: Specifies the number of invalid Hello packets of a Level-2 IS-IS neighbor.If neither the level-1 keyword nor the level-2 keyword is specified, the commandtakes effect on both level-1 and level-2 IS-IS neighbors.DescriptionUse the isis timer holding-multiplier command to configure the number of invalidHello packets for an IS-IS neighbor. When a specified number of Hello packets are notreceived from a neighbor, the neighbor will be considered as invalid.Use the undo isis timer holding-multiplier command to resume the defaultconfiguration.The number of invalid Hello packets is three by default.You can configure the time intervals of Hello packets separately for Level-1 andLevel-2 peers. But for point-to-point link, as there is only one kind of Hello packet, soyou need not specify Level-1 or Level-2.In fact, the number of invalid Hello packets is used to configure Holddown time. If arouter receives no Hello packet from peer router within Holddown time, it will take thepeer router as invalid. Depending on the interface configuration, the Holddown timecan be configured differently for different routers within an area. You can adjust theHolddown time by changing either the time interval for sending Hello packets or thenumber of invalid Hello packets.Related command: isis timer hello.Example# Configure the number of Level-2 Hello packets signifying peer invalid as 5 forVlan-interface, that is, if no Hello packet is received from the interface within 5 Hellopacket time intervals, the IS-IS peer is considered as invalid.<3Com> system-viewSystem View: return to User View with Ctrl+Z.
