(Optional) Adjusting C-RP Control Parameters

Context

When a candidate rendezvous point (C-RP) is configured on an interface, the C-RP periodically sends Advertisement messages to a bootstrap router (BSR). The Advertisement messages carry the C-RP priority and the holdtime of Advertisement messages. After receiving Advertisement messages, the BSR starts the C-RP timeout timer. The timer value is set to the holdtime of Advertisement messages. Before the timer expires, the BSR:

Collects C-RP information in Advertisement messages into an RP-set.
Encapsulates the RP-set into a Bootstrap message.
Advertises the Bootstrap message to all IPv6 PIM devices

If the BSR does not receive any Advertisement message from the C-RP after the timer expires, the BSR considers the C-RP invalid or unreachable on the network. The interval for sending Advertisement messages must be smaller than the holdtime of Advertisement messages so that the BSR can receive the Advertisement messages.

You can manually configure the interval for sending Advertisement messages, C-RP priority and holdtime of Advertisement messages. To prevent C-RP spoofing, set the range of valid C-RP addresses on the BSR. Then the BSR accepts only the Advertisement messages with the source addresses in the specified range.

For the default values of the parameters carried in Advertisement messages, see Configuring an RP.

Procedure

Configure parameters on Advertisement messages on the C-RP.
1. Run system-view
  The system view is displayed.
2. Run pim-ipv6
  The PIM-IPv6 view is displayed.
3. Run c-rp priority priority
  The C-RP priority is configured.
4. Run c-rp advertisement-interval interval
  The interval for sending Advertisement messages is configured.
5. Run c-rp holdtime interval
  The time period to hold the Advertisement messages received from the C-RP is configured.
Configure the valid C-RP address range on the BSR.
1. Run system-view
  The system view is displayed.
2. Run pim-ipv6
  The PIM-IPv6 view is displayed.
3. Run crp-policy advanced-acl6-number
  The range of valid C-RP addresses and the range of groups that C-RPs serve are configured.
  
  When configuring an ACL rule for the device, use the permit parameter to configure the device to accept only Advertisement messages with addresses in a specified range. If no rule is configured in the ACL, the device discards Advertisement messages.