Enabling PIM passive mode
About PIM passive mode
To guard against PIM hello spoofing, you can enable PIM passive mode on a receiver-side interface. The PIM passive interface cannot receive or forward PIM protocol messages (excluding register, register-stop, and C-RP-Adv messages), and it acts as the DR on the subnet. In BIDIR-PIM, it also acts as the DF.
Restrictions and guidelines
To avoid duplicate multicast data transmission and flow loop, do not enable this feature on a shared-media LAN with multiple PIM devices.
Procedure
Enter system view.
system-view
Enter interface view.
interface interface-type interface-number
Enable PIM passive mode on the interface.
pim passive
By default, PIM passive mode is disabled on an interface.