What are precautions for configuring static RP in Layer 3 multicast application


When only one RP exists on the network, you can configure a static RP rather than using a dynamic RP. This reduces bandwidth occupied by messages exchanged between the candidate rendezvous point (C-RP) and the bootstrap router (BSR).

Pay attention to the following when configuring a static RP:

1.The same static-rp command must be used on all the switches in the PIM-SM domain.
2.If the preferred keyword is not used when you configure the static RP, the switch prefers the dynamic RP elected through the BSR mechanism. The switch prefers the static RP only when you specify the preferred keyword in the static-rp command.
3.If multiple static RPs are available for a multicast group, the RP with the largest IP address serves the group.
4.If an ACL is specified in the command, the static RP serves only the groups permitted by the ACL.

Other related questions:
How to configure multiple static RPs on a multicast network
The right figure shows how to configure multiple static Rendezvous Points (RPs) on a CE series switch.

Do S series switches support the Layer 3 multicast function
To achieve multicast forwarding of video services on Layer 3 networks, you need to configure the Layer 3 multicast function on switches. The Layer 3 multicast function requires two multicast protocols as follows: - Internet Group Management Protocol (IGMP): It is used to establish and maintain multicast group memberships between receiver hosts and directly connected multicast routers. - Protocol Independent Multicast (PIM): It is used to obtain multicast requirements of receiver hosts, generate multicast routing entries, and set up multicast forwarding paths. IGMP and PIM are supported by Huawei S series modular switches, and Sx7 series fixed switches including the S3700EI, S3700HI, S5700EI, S5710EI, S5720EI, S5700HI, S5710HI, S5720SI, S5720S-SI, S5720HI, S6700EI, S6720EI and S6720S-EI.

What are the precautions for configuring multicast BFD
The BFD packets sent in multicast mode are untagged. When a port configured with multicast BFD receives tagged packets, it checks the tag of the packets. If the tag is different from the port's default VLAN ID, the port discards the packets. To configure multicast BFD on an interface, run the port default vlan command to specify the default VLAN of the interface.

Can an S series switch accurately forward multicast data packets if only Layer 3 multicast is configured
For S series switches, Layer 3 multicast protocols can identify only Layer 3 VLANIF interfaces. If only Layer 3 multicast is configured and Layer 2 multicast is not enabled, multicast data is replicated on a VLANIF interface and broadcast in the corresponding VLAN, but cannot be forwarded to an accurate physical interface. When Layer 2 multicast is enabled in the VLAN corresponding to the VLANIF interface, multicast data can be accurately forwarded through a Layer 2 interface.

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