User's Manual

C HAPTER 7 | Services
IGMP Proxy Configuration
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Figure 44: IGMP Proxy Configuration
The following items are displayed on this pages:
◆ IGMP Proxy — Enables IGMP proxy. When enabled, the upstream
interface acts as a host interface, sending query messages periodically
to the downstream interfaces, sending join and leave messages to the
upstream multicast router when a first join or last leave message is
received from a downstream interface, and sending membership
reports in response to query messages from the multicast router.
◆ Multicast Allowed — Enables multicast forwarding. (Default: Enabled)
◆ Robustness Count — Specifies the robustness (or expected packet
loss) for interfaces. The robustness value is used in calculating the
appropriate range for other IGMP variables. (Range: 1-255; Default: 2)
◆ Last Member Query Count — The number of query messages sent
before the router determines that there are no remaining members of
the specific host group being queried on the interface. (Range: 1-255;
Default: 2)
◆ Query Interval — The interval between sending IGMP general queries.
(Range: 2-31744 seconds; Default: 60 seconds)
◆ Query Response Interval — The maximum time the system waits for
a response to general queries. (Range: 10-31744 tenths of a second;
Default: 10 seconds)
◆ Group Leave Delay — The time duration it takes a device to stop
forwarding multicast frames after an IGMP Leave Group message has
been successfully sent to the device. (Default: 2000 ms)