Инструкции По Установке для 3com S7906E

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receiving multicast data from the multicast source, the RP sends a register-stop message to the 

source-side DR. Upon receiving this message, the DR stops sending register messages encapsulated 

with multicast data and starts a register-stop timer. When the register-stop timer expires, the DR sends 

a null register message (a register message without encapsulated multicast data) to the RP. If the DR 

receives a register-stop message during the register probe time, it will reset its register-stop timer; 

otherwise, the DR starts sending register messages with encapsulated data again when the 

register-stop timer expires.  

The register-stop timer is set to a random value chosen uniformly from the interval (0.5 times 

register_suppression_time, 1.5 times register_suppression_time) minus register_probe_time.  

Configure a filtering rule for register messages on all C-RP routers and configure them to calculate the 

checksum based on the entire register messages. Configure the register suppression time and the 

register probe time on all routers that may become source-side DRs.  

Follow these steps to configure register-related parameters:  

To do... 

Use the command... 

Remarks 

Enter system view 

— 

Enter public instance PIM view 
or VPN instance PIM view 

pim [ vpn-instance 
vpn-instance-name ] 

— 

Configure a filtering rule for 
register messages  

register-policy acl-number 

Optional 

No register filtering rule by 
default  

Configure the device to 
calculate the checksum based 
on the entire register messages  

register-whole-checksum 

Optional 

By default, the checksum is 
calculated based on the header 
of register messages  

Configure the register 
suppression time 

register-suppression-timeou
t interval 

Optional 

60 seconds by default  

Configure the register probe 
time  

probe-interval interval 

Optional 

5 seconds by default  

 

If an S7900E series routing switch acts as an RP or the receiver-side DR, it initiates an STP switchover 

process (by default) upon receiving the first multicast packet along the RPT. You can disable the 

switchover from RPT to SPT.  

Follow these steps to disable SPT switchover:  

To do... 

Use the command... 

Remarks 

Enter system view 

— 

Enter public instance PIM view 
or VPN instance PIM view 

pim [ vpn-instance 
vpn-instance-name ] 

—