From the navigation
tree, double-click VLAN.
In the VLAN
tree, double-click VLANs.
In the Basic tab,
select the VLAN ID that you want to configure with PIM.
In the toolbar,
click IP.
In the work
area, click the PIM tab.
In the CBSRPreference field, type the value of the C-BSR priority.
In the toolbar,
click Apply.