Product Documentation

Configure Multicast Groups

Multicast groups can be configured to support low bandwidth multicast traffic in simplified networks. You can define multicast groups such that the network administrator can control the source and destination of multicast traffic. You can configure different multicast group IP Address and set the source and destination virtual interfaces to appropriately pass-through multicast traffic.

Two primary use cases supported in SD-WAN are:

  1. Support for existing multicast networks in the underlay.1. Support for manually defined static multicast trees that allow forwarding multicast traffic through the overlay.

How to configure Multicast Groups in SD-WAN GUI

  1. In the SD-WAN GUI, go to Configuration > Virtual WAN > Configuration Editor. Open an existing configuration package.

  2. Go to Connections > View Region > View Site > <Site> > Multicast Groups.

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  3. Expand Multicast Groups. Click Add. Add Group Name and IP Address.

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  4. Edit Service for the Multicast traffic.

  • Basic settings: define the basic parameters of the multicast group. The only parameter available is the Multicast group IP address. This address may be a single IP address or an address and mask. All addresses or networks must be contained within the Class D address range (224.0.0.0/4).

  • Multicast Group IP: Configure a valid class D Multicast IP Address or Subnet.

  • Routing Domain: For multiple routing domains, configure valid routing domain which is receiving Multicast traffic.

  • Direction, Send: defines where multicast traffic is accepted from. This section includes the following components:

  • Service Type: Local, Internet, Intranet, GRE Tunnel, Virtual Path. The Service Type on which Multicast traffic is received.

  • Service Instance: The Service Name on which Multicast traffic is received.

  • Direction Receive: defines the services on which traffic is replicated on. This section includes the following components:

  • Service Type: Local, Internet, Intranet, GRE Tunnel, Virtual Path. The Service Type on which Multicast traffic is sent.

  • Service Instance: The Service Name on which Multicast traffic is sent.

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Note

  1. Due to issues with session tracking, particularly as it involves forwarding a single packet on multiple interfaces, NAT lookups are modified to ignore multicast packets. Therefore, Static 1:1 NAT translation for multicast traffic is not supported in Release 9.3.1.

  2. IGMP snooping is not supported in Release 9.3.1.

  3. Multicast packets routed through the IP forwarder have TTL performed. Since IGMP messages are sent with a TTL of 1, you need to avoid decrementing the TTL for replicated messages.

Monitoring Multicast Traffic

In the SD-WAN GUI, go to Monitoring > Statistics. Select Multicast Group from the drop-down list. This displays the statistics page for existing Multicast groups configured for a specific site in the SD-WAN GUI.

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Configure IGMP Proxy

The ability to configure multicast groups to support low bandwidth multicast traffic in simplified networks is supported.

With static multicast group, network administrators can control the source and destination of the multicast traffic. Instead of statically configuring the multicast group, users can configure IGMP proxy for updating the upstream core networks with all the sources in the downstream networks of the edge.

  1. In the SD-WAN GUI, go to Connections > View Region > View Site > Site.

  2. Select Multicast Groups > Basic Settings. Click Enable IGMP Proxy. localized image

  3. Go to Services. Select Virtual Path as the Service Type to configure multicast group traffic.

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In the SD-WAN GUI, under the Virtual WAN > View Configuration tab, you can view the configured Multicast groups. You can also monitor Multicast Group traffic from the Monitoring tab.

Configure Multicast Groups