4.11. Timer Values

This section specifies the default values and valid ranges for PIM timers.

Hello Message Timers:

• Hello_Period: 30 seconds (default)
• Triggered_Hello_Delay: 5 seconds
• Default_Hello_Holdtime: 3.5 × Hello_Period = 105 seconds

Join/Prune Message Timers:

• t_periodic: 60 seconds (Join/Prune interval)
• t_suppressed: Randomized suppression timer
• t_override: 2.5 seconds (LAN Prune delay override)

Register Message Timers:

• Register_Suppression_Time: 60 seconds
• Register_Probe_Time: 5 seconds

Assert Timers:

• Assert_Time: 180 seconds
• Assert_Override_Interval: 3 seconds

State Timeout Values:

• Most state has associated holdtime from messages
• Default holdtimes typically 3x the transmission interval
• Provides robustness against occasional packet loss

Randomization: Many timers include randomization to prevent synchronization and reduce message storms.

note

For complete timer value specifications, configuration guidance, and interoperability considerations, see Section 4.11 of RFC 7761.