3com 5500-SI Manual De Usuario

C

HAPTER

 18: M

ULTICAST

 P

ROTOCOL

In BSR mechanism, a C-RP router unicasts C-RP messages to the BSR, which then 
propagates the C-RP messages among the network by BSR message. To prevent C-RP 
spoofing, you need to configure 

 on the BSR to limit legal C-RP range and 

their service group range. Since each C-BSR has the chance to become BSR, you must 
configure the same filtering policy on each C-BSR router.

Perform the following configuration in PIM view.

For detailed information of 

, please refer to the command manual.

Refer to “PIM-DM Overview” on page 333.

Refer to “PIM-DM Overview” on page 333.

After the above configuration, execute display command in any view to display the 
running of PIM-SM configuration, and to verify the effect of the configuration.

Execute 

 command in user view for the debugging of PIM-SM.

In actual network, we assume that the switches can intercommunicate.

Suppose that Host A is the receiver of the multicast group at 225.0.0.1. Host B begins 
transmitting data destined to 225.0.0.1. Switch_A receives the multicast data from 
Host B via Switch_B. 

Table 359   Limiting the range of legal C-RP

Set the legal C-RP range limit 

crp-policy acl-number

Restore to the default setting

Table 360   Displaying and debugging PIM-SM

Display the BSR 
information

Display the RP information display pim rp-info [ group-address ]

Enable the PIM-SM 
debugging

Disable the PIM-SM 
debugging