3com MSR 20-20 참조 매뉴얼

c-rp holdtime interval

Public instance PIM view, VPN instance PIM view

interval: C-RP timeout in seconds, with an effective range of 1 to 65,535.

Use the c-rp holdtime command to configure the global C-RP timeout time, 
namely the length of time the BSR waits before it must receive a C-RP-Adv 
message.

Use the undo c-rp holdtime command to restore the default setting.

By default, the C-RP timeout time is 150 seconds.

Because a non-BSR router refreshes its C-RP timeout time through BSR bootstrap 
messages, to prevent loss of BSR bootstrap messages, make sure that the C-RP 
timeout time is not smaller than the interval at which the BSR sends bootstrap 
messages. The recommended C-RP timeout setting is 2.5 times the bootstrap 
interval or longer.

c-rp (PIM view) and c-bsr interval (PIM view).

# Set the global C-RP timeout time to 200 seconds in the public instance.

<Sysname> system-view

[Sysname] pim

[Sysname-pim] c-rp holdtime 200 

crp-policy acl-number

Public instance PIM view, VPN instance PIM view

acl-number: Advanced ACL number, in the range of 3000 to 3999. When the ACL 
is defined, the source keyword in the rule command specifies the address of a 
C-RP and the destination keyword specifies the address range of the multicast 
groups that the C-RP will serve.

Use the crp-policy command to configure a legal C-RP address range and the 
range of served multicast groups, so as to guard against C-RP spoofing.