On which interfaces does PIM need to be enabled

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When receiving a multicast packet, a switch performs Reverse Path Forwarding (RPF) check on the packet and searches for the optimal route to the destination. The outbound interface of the route is the RPF interface and the next hop of the route is the RPF neighbor. A multicast forwarding entry can be created only after PIM is enabled on the RPF interface and the RPF neighbor. In this way, a complete multicast distribution tree can be set up along the forwarding path of the packet.

It is recommended that you enable PIM on all non-edge interfaces in the PIM domain because all these interfaces have a chance to become an RPF interface or RPF neighbor. On the switch directly connecting to a multicast source, the RPF interface for packets sent from the multicast source is the interface connected to the multicast source. Therefore, PIM must be enabled on this interface.

Other related questions:
Enable and disable PoE on an S series switch
Enable or disable the PoE function on S series switches:

1. By default, the PoE function is enabled on an interface
2. Enable or disable PoE power supply.
<HUAWEI>system-view
[HUAWEI]interface gigabitethernet 1/0/0
[HUAWEI-GigabitEthernet1/0/0]undo poe enable  //Disable PoE power supply.
[HUAWEI-GigabitEthernet1/0/0]poe enable       //Enable PoE power supply.

The downlink electrical interfaces of PoE switches support PoE power supply, with up to 30 W power on each interface. The maximum power supply distance is 100 m.
Only ES0D0G48VA00 (S7700)/LE0DG48VEA00 (S9300) cards of modular switches (S7700/S9700/S9300/S12700) support PoE power supply.

If the switch connects to 48 V standard PoE powered devices but cannot negotiate power supply capabilities with the devices, you can run poe force-power on the interfaces to forcibly power on the devices.


How do I obtain the communication matrix of the TE series endpoint?
The TE30, TE40, TE50, and TE60 share a communication matrix, which can be downloaded at the following link: TE30&TE40&TE50&TE60&TX50&RP100&RP200 Communication Matrix

Does STP need to be configured when an interface on an S series switch that functions as an L3 interface is connected to another device
If an interface of an S series switch (except the S1700) functions as an L3 interface, disable STP on the interface. If the interface connects to terminals, configure the interface as an edge interface. To use this interface as an L2 interface after STP is disabled on this interface, enable STP again. Otherwise, loops cannot be prevented.

What are the functions of PIM silent on a PIM interface
On the access layer, if the interface directly connected to a host is enabled with the PIM protocol, PIM neighbors can be established on this interface to process various PIM protocol packets. Such configuration, however, may bring security problems. For example, when malicious hosts send a large number of pseudo PIM Hello packets, it may lead to the collapse of the device. To avoid the preceding problem, you can run the pim silent command on the interface to set the interface to work in PIM silent state. After the interface enters the PIM silent state, it is forbidden to receive or forward any PIM protocol packet. All PIM neighbors and the PIM state machine on this interface are deleted and the interface automatically becomes a DR. Meanwhile, the PIM silent function does not affect the IGMP function on the interface. The PIM silent function is applicable only to the interface that is directly connected to the network segment of user hosts, and only one PIM device can be connected to this network segment.

On which interfaces can MPLS be enabled
MPLS can be enabled for the following interfaces: -GE interface -GE sub-interface -XGE interface (in V200R005C10 and later versions) -XGE sub-interface (in V200R005C10 and later versions) -Ethernet interface -Ethernet sub-interface -Eth-Trunk interface -Eth-Trunk sub-interface -Serial interface -POS interface In V200R001C01 and later versions, MPLS can be enabled on MP-Group interfaces. In V200R005C10 and later versions, MPLS can be enabled on IP-Trunk interfaces.

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