Operation Manual

SFX SERIES USER’S GUIDE
Rev 2.2 45
Menu Item Description
Query Interval = 125 seconds.
Query Response Interval = 10 seconds.
Last Member Query Interval = 1 seconds.
Last Member Query Count = 2.
Starting Query Interval = 31 seconds.
Starting Query Count = 2.
The individual IGMP variables displayed are explained in the IGMP Edit page section shown below. When the Edit
menu item is selected, the IGMP Edit page will be displayed, as shown by the sample page in Figure 2- 21.
Figure 2- 20 IGMP Page for Net1
The following fields can be edited on the IGMP Edit page:
Edit Field Description
IGMP Enabled A check in this field enables or disables IGMP support. If IGMP is disabled, the receiver outputs
all multicast packets.
IGMP Version Select V1 or V2 IGMP. See IGMP V1 – RFC 1112 and IGMP V2 – RFC 2236.
Robustness Variable This field is related to the expected packet loss on the subnet. IGMP is robust to (Robustness
Variable – 1) packet losses. The default value is 2.
Query Interval This field sets the frequency at which General Queries are sent out on the LAN, via the Ethernet
interface. The default value is 125 seconds.
Query Response
Interval
This field sets the amount of time a node on the LAN has to respond to an IGMP query. The
default value is 10 seconds.
Last Member Query
Interval
This field sets the maximum response time to a Group-Specific Query that is sent after a Leave
Group Message is received from a node on the LAN. The default value is 1 second.