Configuring PIM Silent
Context
On the access layer, if the PIM protocol is enabled on the interfaces directly connected to user hosts, the interfaces can establish PIM neighbor relationships to process various PIM packets. The configuration, however, brings security risks. When a host maliciously sends many PIM Hello messages, the device may break down.
To prevent the preceding case, set the state of the device interface to PIM silent. An interface in PIM silent state is disabled from receiving and forwarding any PIM packet. All PIM neighbors and PIM state machines on the interface are deleted, and the interface immediately becomes a static DR. The PIM silent function does not affect the Internet Group Management Protocol (IGMP) function on the interface.
PIM silent takes effect on an interface only when the interface is directly connected to a user network segment and when the network segment is connected only to this PIM device.
After you configure PIM silent on an interface, the interface no longer receives or sends any PIM packets and other PIM functions on the interface become invalid. Confirm your action before configuring this function.