Adjusting Time Parameters for State-Refresh Messages

Context

The PIM device directly connected to a multicast source sends State-Refresh messages at intervals to downstream devices. State-Refresh messages are flooded on the entire network, so a device may receive duplicate State-Refresh messages within a short time. To prevent this problem, a switch starts a timer when receiving a State-Refresh message for an (S, G) entry. The timer value is the suppression time of the State-Refresh message. If the switch receives the same State-Refresh messages before the timer expires, it drops the received State-Refresh messages.

Default Settings

Table 1 lists the default settings of time parameters for State-Refresh messages.

**Table 1** Default settings of time parameters for State-Refresh messages
Parameter	Default Setting
Interval for sending State-Refresh messages	60s
Suppression time of duplicate State-Refresh messages	30s

Procedure

Set the interval for sending State-Refresh messages on the switch directly connected to a multicast source.
1. Run system-view
  The system view is displayed.
2. Run pim-ipv6
  The PIM-IPv6 view is displayed.
3. Run state-refresh-interval interval
  The interval for sending State-Refresh messages is set.
Set the suppression time of duplicate State-Refresh messages on all the PIM devices.
1. Run system-view
  The system view is displayed.
2. Run pim-ipv6
  The PIM-IPv6 view is displayed.
3. Run state-refresh-rate-limit interval
  The suppression time of duplicate State-Refresh messages is set.