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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Configuring IPv4 Layer 3 Multicast Over VXLAN

Configuring IPv4 Layer 3 Multicast Over VXLAN

Usage Scenario

VXLAN has been widely used on data center networks, and Layer 3 multicast-based application services, including network live broadcast, video conferencing, and online games, are becoming more and more popular. To provision these services on a data center VXLAN network, NG MVPN needs to be deployed on the control plane for configuration of IPv4 Layer 3 multicast over VXLAN. Figure 14-17 shows a typical networking diagram with three scenarios:

  • Scenario 1: A multicast source and a multicast receiver (for example, Receiver 1) reside at the same site.

  • Scenario 2: A multicast source and a multicast receiver (for example, Receiver 2) reside at different sites, and the receiver accesses a PE through a VPN-based Layer 3 multicast network.

  • Scenario 3: A multicast source and a multicast receiver (for example, Receiver 3) reside at different sites, and the receiver accesses a PE through a Layer 2 sub-interface bound to a BD.

For details about how the three scenarios differ in their configuration procedures, see Figure 14-18.

NOTE:
  • Layer 3 VXLAN gateways can be deployed in centralized or distributed mode. Currently, Layer 3 multicast can be configured only in distributed VXLAN gateway scenarios.

  • VXLAN supports only IPv4 Layer 3 multicast deployment at present, both VXLAN underlay and overlay networks can only be IPv4 networks.

  • When a multicast receiver connected to a CE accesses a PE over a VPN-based Layer 3 multicast network, the PE can directly connect to the CE through a common Layer 3 interface or through a Layer 2 sub-interface bound to a BD.

Figure 14-17 IPv4 Layer 3 multicast over VXLAN networking

Pre-configuration Tasks

Before configuring IPv4 Layer 3 multicast over VXLAN, complete the following tasks:

  • Configure VXLAN in distributed gateway mode using BGP EVPN on VXLAN gateways (PEs in Figure 14-17) to enable Layer 3 communication between the multicast source and receivers connected to the PEs over L3VPN.

    NOTE:

    When a multicast receiver accesses a PE through a VPN-based Layer 3 multicast network and a Layer 3 VXLAN gateway is configured on the PE, an IP prefix route must be used on the PE to advertise the network segment route of the multicast receiver.

  • Configuring the multicast replication mode for forwarding BUM packets for each Layer 3 VNI of the L3VPN instance on VXLAN gateways (PEs in Figure 14-17).

Configuration Procedure

Figure 14-18 Flowchart for configuring IPv4 Layer 3 multicast over VXLAN
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Updated: 2019-04-20

Document ID: EDOC1100075361

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