pim silent

Function

The pim silent command enables the PIM silent function on an interface.

The undo pim silent command cancels the PIM silent function on an interface.

By default, the PIM silent function is disabled on an interface.

Format

pim silent

undo pim silent

Parameters

None

Views

GE interface view, XGE interface view, MultiGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, Eth-Trunk interface view, GE sub-interface view, XGE sub-interface view, MultiGE sub-interface view, 25GE sub-interface view, 40GE sub-interface view, 100GE sub-interface view, Eth-Trunk sub-interface view, VLANIF interface view, loopback interface view, tunnel interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

To protect the switch against pseudo PIM Hello messages sent from malicious hosts, configure the pim silent command on the interface directly connected to the host network segment to set the interface to PIM silent mode. Then the interface cannot receive or forward any PIM packet, and all PIM neighbors and PIM state machines on this interface are deleted. This interface becomes the DR, but the IGMP function on the interface is not affected.

The PIM silent function applies only to the interface directly connected to a host network segment, and only one PIM switch can be connected to this network segment.

Prerequisites

IP multicast routing has been enabled using the multicast routing-enable command.

Precautions

Running the pim silent command failed on the VLANIF interface because Layer 2 multicast querier or report-suppress is enabled for this VLAN.

If PIM BFD function is enabled on the interface, this command cannot be configured.

This command and pim timer dr-switch-delay command are mutually exclusive.

After you run this command 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 using this command.

If a host network segment is connected to multiple switches and PIM silent is enabled on multiple interfaces, all these interfaces become static DRs. This causes multicast forwarding failures.

Example

# Configure the PIM silent function on VLANIF100.

<HUAWEI> system-view
[HUAWEI] multicast routing-enable
[HUAWEI] interface vlanif 100
[HUAWEI-Vlanif100] pim silent

Configure the PIM silent function on GE0/0/1.

<HUAWEI> system-view
[HUAWEI] multicast routing-enable
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo portswitch
[HUAWEI-GigabitEthernet0/0/1] pim silent