Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 7 PIM Configuration7-36To do... Use the command... RemarksConfigure the prune delaytime (LAN-delay)pim hello-optionlan-delay intervalOptional500 milliseconds bydefaultConfigure the pruneoverride intervalpim hello-optionoverride-interval intervalOptional2,500 milliseconds bydefaultDisable join suppression pim hello-optionneighbor-trackingOptionalEnabled by defaultConfigure the interface toreject hello messageswithout a generation IDpim require-genidOptionalBy default, hellomessages withoutGeneration_ID areaccepted7.5.5 Configuring PIM Common TimersPIM routers discover PIM neighbors and maintain PIM neighboring relationships withother routers by periodically sending out hello messages.Upon receiving a hello message, a PIM router waits a random period, which is equal toor smaller than the maximum delay between hello messages, before sending out ahello message. This avoids collisions that occur when multiple PIM routers send hellomessages simultaneously.Any router that has lost assert election will prune its downstream interface and maintainthe assert state for a period of time. When the assert state times out, the assert loserswill resume multicast forwarding.A PIM router periodically sends join/prune messages to its upstream for state update. Ajoin/prune message contains the join/prune timeout time. The upstream router sets ajoin/prune timeout timer for each pruned downstream interface, and resumes theforwarding state of the pruned interface when this timer times out.When a router fails to receive subsequent multicast data from the multicast source S,the router will not immediately delete the corresponding (S, G) entries; instead, itmaintains (S, G) entries for a period of time, namely the multicast source lifetime,before deleting the (S, G) entries.
