Adjusting Control Parameters for Prune Delay

Context

LAN-delay specifies the delay from the time a device receives a Prune message from a downstream interface to the time it sends the Prune message to an upstream interface. A PIM device does not prune the corresponding downstream interface immediately after it sends the Prune message. If another device still requests multicast data, it needs to send a Join message to the upstream device within this period. The period for overriding the Prune message is called override-interval. The delay from the time a PIM device receives a Prune message to the time it performs the prune action is the sum of the LAN-delay and override-interval.

The LAN-delay and override-interval can be configured globally or on an interface. If the two parameters are configured in both the global PIM view and interface view, the configuration in the interface view takes effect.

Default Settings

Table 1 lists the default settings of control parameters for prune delay.

**Table 1** Default settings of control parameters for prune delay
Parameter	Default Setting
LAN-delay	500 ms
Override-interval	2500 ms

Procedure

Global configuration
1. Run system-view
  The system view is displayed.
2. Run pim [ vpn-instance vpn-instance-name | all-instance ]
  The PIM view is displayed.
3. Run hello-option lan-delay interval
  The delay for transmitting messages in a shared network is configured.
4. Run hello-option override-interval interval
  The interval for overriding the prune action is configured.
Configuration on an interface
1. Run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. (Optional) On an Ethernet interface, run undo portswitch
  The interface is switched to Layer 3 mode.
  
  By default, an Ethernet interface works in Layer 2 mode.
  
  Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
4. Run pim hello-option lan-delay interval
  The delay for transmitting messages in a shared network is configured.
5. Run pim hello-option override-interval interval
  The interval for overriding the prune action is configured.