4.10. PIM Timers

PIM uses various timers to maintain protocol state and trigger periodic actions.

Key Timer Types:

Hello Timers:

• Hello Timer (HT): Triggers periodic Hello messages
• Neighbor Liveness Timer (NLT): Detects neighbor failures
• Default: 30 seconds Hello interval, 105 seconds holdtime

Join/Prune Timers:

• Join Timer (JT): Triggers periodic Join refresh
• Prune Timer (PT): State expires if not refreshed
• Default: 60 seconds Join interval, 210 seconds holdtime

Register Timers:

• Register-Stop Timer (RST): Duration to suppress Register messages
• Default: 60 seconds

Assert Timers:

• Assert Timer (AT): Assert winner state duration
• Default: 180 seconds

Other Timers:

• Upstream Join Timer: Controls upstream Join messages
• Downstream Prune Timer: Tracks downstream Prune state
• Override Interval: Delay before sending Prune override

note

For complete timer specifications, default values, and timer interactions, see Section 4.10 of RFC 7761.