IGMP Proxy

The Internet Group Management Protocol (IGMP) is used by hosts and routers on an IP network to create multicast group memberships. IGMP can be used for resources of web and support applications like online streaming for videos and games. The IGMP proxy enables the device to issue IGMP messages on behalf of the clients behind it.

To enable the IGMP proxy follow these steps:

Procedure

Step 1

Click Multicast > IPv4 Multicast Configuration > IGMP Proxy.

Step 2

Enter the following global fields:

IGMP Multicast Routing

Select to enable IPv4 Multicast routing.

Downstream Protection

Select to discard downstream packets not required for the device.

Source Specific Multicast

Select to enable delivering Multicast packets originating from a specific source address defined in the next field.

SSM IPv4 Access List

Define the list containing source addresses from which to deliver Multicast packets:

  • Default list—Defines the SSM range access list to 232.0.0.0/8.

  • User-defined access list—Select the standard IPv4 access list name defining the SSM range.

Step 3

Click Apply. The Running Configuration file is updated.

Step 4

To add protection to a VLAN, click Add and enter the following fields:

Upstream Interface

Select the upstream interface. Since there’s only a single upstream interface, if one has already been selected, this field is grayed out.

Downstream Interface

Select the downstream interface. There can be multiple downstream interfaces.

Downstream Protection

Select one of the following options:

  • Use global—Use the status set in the global block.

  • Disable—This enables forwarding of IPv4 Multicast traffic from downstream interfaces.

  • Enable—This disables forwarding from downstream interfaces.

Step 5

Click Apply. The Running Configuration file is updated.

The following fields are displayed for each IPv4 Multicast route:

Source Address

Unicast source IPv4 address.

Group Address

Multicast destination IPv4 address.

Incoming Interface

Expected interface for a Multicast packet from the source. If the packet isn’t received on this interface, it’s discarded.

Outgoing Interfaces

Interfaces through which packets will be forwarded.

Uptime

Length of time in hours, minutes, and seconds that the entry has been in the IP Multicast routing table.

Expiry Time

Length of time in hours, minutes, and seconds until the entry is removed from the IP Multicast routing table.