Hello, everyone multicast virtual private network (VPN) technology allows multicast services to run on Border Gateway Protocol or Multiprotocol Label Switching (BGP/MPLS) IP VPN networks.
Multicast VPN technology encapsulates multicast packets from the private's network so that they can be forwarded along a multicast distribution tree (MDT) on a public network. When these packets reach their destination network, they are decapsulated and forwarded to receivers as private network multicast packets.
Users in the VPN need to provide multicast services for them, and multicast services such as IPTV and video conferences are provided in the VPN.
Multicast VPN is a technology that enables multicast services based on the existing MPLS/BGP VPN. Multicast data is transmitted between private networks by encapsulating multicast packets.
Multicast VPN Example
VPN A is used as an example. The multicast VPN can be summarized as follows:
Source belongs to VPN A and sends multicast data to a multicast group G.
Among all possible data receivers on the network, only the members of VPN A can receive multicast data from the source.
Multicast data is transmitted in multicast mode at each site and on the public network.
Multicast protocol packet transmission process
Multicast Data Packet Transmission Process
Multicast source
A device that sends multicast data to receiver hosts. For example, a video server is a multicast source.
IPv4 Protocol Independent Multicast (PIM) device
A device that uses the IPv4 PIM protocol to generate and maintain multicast routing entries and forwards multicast data based on multicast routing entries. On an IPv4 multicast network, all Layer 3 devices must run IPv4 PIM; otherwise, multicast forwarding paths cannot be established.
Multicast Source Discovery Protocol (MSDP) device
A device that forwards multicast data from one PIM network to another. For example, if multicast data needs to be transmitted between two autonomous systems (ASs), the devices at the border of the ASs must run the MSDP protocol.
Multicast VPN device
Multicast VPN enables multicast data of a private network to be transmitted over a public network. Multicast VPN devices are used on VPN networks. For example, if two sites of a VPN network need to exchange multicast data across a public network, multicast VPN needs to be configured on the PE devices.
IGMP querier
A device that exchanges IGMP messages with receiver hosts to create and maintain group memberships. On a multicast network, Layer 3 devices connected to network segments of receivers must run the IGMP protocol or be configured with static IGMP groups. Otherwise, upstream PIM devices cannot know the multicast groups that users want to join, and therefore cannot establish multicast forwarding paths.
IGMP snooping device
A device that listens to IGMP messages exchanged between upstream Layer 3 multicast devices and receiver hosts to create and maintain Layer 2 multicast forwarding entries, which are used for accurate multicast data forwarding on a Layer 2 network. To prevent the broadcasting of multicast packets on a Layer 2 network and conserve network bandwidth, it is recommended that you configure IGMP snooping on Layer 2 devices.
Receiver
A multicast user that receives multicast data. A receiver can be a PC, a set-top box, or any device with a multicast client installed.
The "Multicast VPN Configuration" chapter describes how to configure multicast VPN on a provider edge (PE) device.
Configuring MD VPN
You must enable IP multicast routing for a VPN instance before configuring multicast protocols. Other multicast functions can be configured only after IP multicast routing is enabled. All multicast configurations become invalid when IP multicast routing is disabled.
Perform the following steps on a PE.
1. Run system-view
The system view is displayed.
2. Run ip vpn-instance vpn-instance-name
The VPN instance view is displayed.
The vpn-instance-name parameter specifies the name of the VPN instance that has been deployed on the PE and requires multicast data forwarding. For the VPN configuration, see BGP/MPLS IP VPN Configuration in the S2720, S5700, and S6700 V200R019C10 Configuration Guide - VPN.
3. (Optional) Run ipv4-family
The IPv4 address family is enabled for the VPN instance, and the VPN instance IPv4 address family view is displayed.
4. By default, the VPN instance IPv4 address family is enabled after a route distinguisher (RD) is configured for the VPN instance using the route-distinguisher command in the VPN instance view.
5.Run multicast routing-enable
IP multicast routing is enabled for the VPN instance.
By default, IP multicast routing is disabled for a VPN instance
For more details, please refer to the link: https://support.huawei.com/hedex/hdx.do?docid=EDOC1100126530&id=EN-US_TASK_0177106812&lang=en
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