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messages are suppressed. To solve this problem, disable the join suppression function on all PIM-capable 
routers that connect to the PIM snooping-capable switch in the VLAN.  
Solution 
1.  Use the pim hello-option neighbor-tracking command to enable the neighbor tracking function on 
the interfaces of PIM routers that connect to the PIM snooping-capable switch. 
2.  If a PIM-capable router cannot be enabled with the neighbor tracking function, you have to disable 
PIM snooping on the switch.