4-16Configuring the Hello IntervalIn a PIM domain, a PIM router discovers PIM neighbors and maintains PIM neighboring relationshipswith other routers by periodically sending hello messages.Follow these steps to configure the Hello interval:To do... Use the command... RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Configure the Hello interval on theinterface pim timer hello secondsRequiredThe default Hello interval is 30seconds.Before configuring related PIM functions, you must enable PIM-DM or PIM-SM first.Configuring PIM NeighborsIn order to prevent plenty of PIM neighbors from exhausting the memory of the router, which may resultin router failure, you can limit the number of PIM neighbors on the router interface. However, the totalnumber of PIM neighbors of a router is defined by the system, and you cannot modify it throughcommands.You can define what Layer 3 switches can become PIM neighbors of the current interface by configuringa basic ACL.Follow these steps to configure PIM neighbors:To do... Use the command... RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —Configure a limit on thenumber of PIM neighbors onthe interfacepim neighbor-limit limitOptionalBy default, the upper limit on the number ofPIM neighbors on an interface is 128.Configure a filtering rule tofilter PIM neighborspim neighbor-policyacl-numberOptionalBy default, no filtering rule is configured.If the number of existing PIM neighbors exceeds the user-defined limit, the existing PIM neighbors willnot be deleted.
