Adjusting Control Parameters for Prune Delay

Context

LAN-delay specifies the delay from when a device receives a Prune message from a downstream interface to when 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 when a PIM device receives a Prune message to when it performs the prune action is the sum of the LAN-delay and override-interval.

The LAN-delay and override-interval are configured globally or on an interface. If you configure the LAN-delay and override-interval in the global PIM-IPv6 view and in the interface view simultaneously, 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-ipv6
  The PIM-IPv6 view is displayed.
3. Run hello-option lan-delay interval
  The delay for transmitting messages in a LAN 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 ipv6 hello-option lan-delay interval
  The delay for transmitting messages in a LAN is configured.
5. Run pim ipv6 hello-option override-interval interval
  The interval for overriding the prune action is configured.