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346 CHAPTER 18: MULTICAST PROTOCOL
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
crp-policy 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
crp-policy, please refer to the command manual.
Clearing Multicast Route Entries from PIM Routing Table
Refer to “PIM-DM Overview” on page 333.
Clearing PIM Neighbors
Refer to “PIM-DM Overview” on page 333.
Displaying and
Debugging PIM-SM
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
debugging command in user view for the debugging of PIM-SM.
PIM-SM Configuration
Example
Networking Requirements
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
Operation Command
Set the legal C-RP range limit crp-policy acl-number
Restore to the default setting undo crp-policy
Table 360 Displaying and debugging PIM-SM
Operation Command
Display the BSR
information
display pim bsr-info
Display the RP information display pim rp-info [ group-address ]
Enable the PIM-SM
debugging
debugging pim sm { all | verbose | mrt | warning |
mbr { alert | fresh } | timer { assert | bsr |
crpadv | jp | jpdelay | mrt | probe | spt } | {
recv | send } { assert | bootstrap | crpadv | reg
| regstop | jp } }
Disable the PIM-SM
debugging
undo debugging pim sm { all | verbose | mrt |
warning | mbr { alert | fresh } | timer { assert |
bsr | crpadv | jp | jpdelay | mrt | probe | spt }
| { recv | send } { assert | bootstrap | crpadv |
reg | regstop | jp } }