Configuring multicast source registration
About multicast source registration
PIM register policy—A PIM register policy enables an RP to filter register messages by using an ACL that specifies the multicast sources and groups. The policy limits the multicast groups to which the RP is designated. If a register message is denied by the ACL or does not match the ACL, the RP discards the register message and sends a register-stop message to the source-side DR. The registration process stops.
Checksum computing method for register messages—For information integrity of a register message, you can configure the device to calculate the checksum based on the entire register message. If a device cannot calculate the checksum based on the entire register message, you can configure the device to calculate the checksum based on the register message header.
Register suppression time—The source-side DR stops sending register messages encapsulated with IPv6 multicast data and starts a register-stop timer upon receiving a register-stop message from the RP. Before the register-stop timer expires, the DR sends a null register message (a register message without encapsulated multicast data) to the RP and starts a register probe timer. If the DR receives a register-stop message before the register probe timer expires, it resets its register-stop timer. Otherwise, the DR starts sending register messages with encapsulated data again.
The register-stop timer is set to a random value chosen uniformly from (0.5 × register_suppression_time minus register_probe_time) to (1.5 × register_suppression_time minus register_probe_time). The register_probe_time is fixed to 5 seconds. You can adjust the register suppression time.
Restrictions and guidelines
On all C-RP devices, configure a PIM register policy and the checksum computing method for register messages.
On all devices that might become the source-side DR, set the register suppression time.
Procedure
Enter system view.
system-view
Enter PIM view.
pim [ vpn-instance vpn-instance-name ]
Configure a PIM register policy.
register-policy ipv4-acl-number
By default, no PIM register policy is configured. All PIM register messages are regarded as legal.
Configure the device to calculate the checksum based on the entire register message.
register-whole-checksum
By default, the device calculates the checksum based on the header of a register message.
Set the register suppression time.
register-suppression-timeout interval
The default setting is 60 seconds.