Configuring IGMP Proxy (NSM Procedure)
IGMP proxy enables a security device to extend the scope of a multicast domain by one hop without running a multicast routing protocol. When you enable IGMP proxy on a device, the interface connected to the hosts (downstream interface) functions as a multicast router, and the interface connected to the upstream router functions as an IGMP host. You must first enable IGMP in host mode on upstream interfaces, and then enable IGMP in Router mode on downstream interfaces, and finally enable IGMP proxy on router interfaces.
To configure an IGMP proxy:
- In the NSM navigation tree, select Device Manager > Devices. Double-click the device object to open the device configuration.
- In the device navigation tree, select Network > Interface.
- Double-click the interface on which you are enabling IGMP. The General Properties screen appears.
- In the interface navigation tree, select Protocol.
- Select IGMP.
If you are enabling IGMP on an upstream interface:
In the Type box, select Host.
If you are enabling IGMP on a downstream interface:
In the Type box, select Router.
Click OK to save your changes to the routing entry.
Click OK to save your changes to the device.
After you configure the interfaces, configure a multicast rule to permit IGMP messages to pass between zones. For information about multicast rules, see the Network and Security Manager Administration Guide.