Adjusting the Information Carrying Capacity of Join/Prune Messages

Context

You can configure the maximum size of each Join/Prune message, maximum number of entries in a Join/Prune message, and Join/Prune message transmission method on the switch to adjust prune information sent to upstream interfaces.

If a PIM neighbor spends a long time to process each Join/Prune message, set a smaller size for each Join/Prune message on the switch to reduce the number of (S, G) entries carried. This mitigates pressure on the PIM neighbor.
If the throughput of Join/Prune messages on the PIM neighbor is low, set a smaller queue size for periodically sending Join/Prune messages to reduce the number of (S, G) entries sent to the PIM neighbor each time. Then the switch sends Join/Prune messages in batches to the PIM neighbor, with fewer Join/Prune messages in each batch.
By default, Join/Prune messages are transmitted to upstream neighbors in a package to improve the transmission efficiency. You can disable the package function.

Default Settings

Table 1 lists the default settings of Join/Prune messages.

**Table 1** Default settings of Join/Prune messages
Parameter	Default Setting
Maximum size of each Join/Prune message	8100 bytes
Number of entries contained in Join/Prune message	1020
Join/Prune message transmission method	Encapsulated in a package

Procedure

Run system-view
The system view is displayed.
Run pim [ vpn-instance vpn-instance-name ]
The PIM view is displayed.
Run join-prune max-packet-length packet-length
The maximum size of each PIM-DM Join/Prune message to be sent is configured.
Run join-prune periodic-messages queue-size queue-size
The maximum number of entries in PIM-DM Join/Prune messages sent in a second is configured.
Run join-prune triggered-message-cache disable
The function to package Join/Prune messages in real time is disabled.