pim dm

Function

The pim dm command enables Protocol Independent Multicast-Dense Mode (PIM-DM) on an interface.

The undo pim dm command restores the default setting.

By default, PIM-DM is disabled on an interface.

Format

pim dm

undo pim dm

Parameters

None

Views

100ge sub-interface view, 100GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE sub-interface view, 25GE interface view, 400GE sub-interface view, 400GE interface view, 40GE sub-interface view, 40GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, Global VE sub-interface view, Loopback interface view, PW-VE sub-interface view, Tunnel interface view, VE sub-interface view, VLANIF interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

A multicast network requires multicast protocols, and PIM is the most widely used intra-domain multicast protocol. PIM-DM is one of the implementations of PIM. PIM-DM resolves the problem of P2MP transmission on a small-scale network with many users.

On a PIM-DM network, the pim dm command must be run to enable PIM-DM. Only a device with PIM-DM enabled can set up PIM neighbor relationships with neighboring devices and process protocol packets received from them.

Prerequisites

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

Precautions

Interfaces belonging to the same instance on a device must have the same PIM mode. When a device is deployed in a PIM-DM domain, it is advised to enable PIM-DM on all non-boundary interfaces.

Multicast must be disabled if you want to switch between the PIM-DM and PIM-SM modes. After the switch is completed, re-enable multicast.

Only tunnel interfaces with an encapsulation mode of GRE support this command.

PIM-DM cannot be deployed with:

Public network of the Rosen MVPN
Interfaces bound to VPNs
Instances where PIM-SM has been configured
BIDIR-PIM
PIM IPsec
Load balancing
DR switch delay
PIM Silent
Neighbor filtering
Multicast source filtering
Networks with both Layer 2 and Layer 3 services
SSM-Policy
The multicast replication mode for forwarding BUM packets on NVE interface.
If you run the undo pim dm command on an interface, PIM neighbor and protocol status information on the interface will be removed. This operation will adversely affect multicast services currently running on the interface.

Example

# Enable PIM-DM on a GRE tunnel interface.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] interface tunnel 5
[*HUAWEI-Tunnel5] tunnel-protocol gre
[*HUAWEI-Tunnel5] pim dm

# Enable PIM-DM on interface GE 0/1/0.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] undo portswitch
[*HUAWEI-GigabitEthernet0/1/0] pim dm