DGS-3024 Gigabit Ethernet Switch Manual 
The following parameters may be viewed or modified: 
Parameter                      Description 
VLAN ID 
This is the VLAN ID that, along with the VLAN Name, identifies the VLAN the user 
wishes to modify the IGMP Snooping Settings for. 
VLAN Name  
This is the VLAN Name that, along with the VLAN ID, identifies the VLAN the user 
wishes to modify the IGMP Snooping Settings for. 
Query Interval  
Allows the entry of a value between 1 and 65535 seconds, with a default of 125 
seconds. This specifies the length of time between sending IGMP queries. 
Max Response Time  
Sets the maximum amount of time allowed before sending an IGMP response report.  
A value between 1 and 25 seconds can be entered, with a default of 10 seconds. 
Robustness Value  
A tuning variable to allow for subnetworks that are expected to lose a large number of 
packets. A value between 2  and  255 can be entered, with larger values being 
specified for subnetworks that are expected to lose larger numbers of packets. The 
default is 2 seconds. 
Last Member Query 
Interval  
Specifies the maximum amount of time between group-specific query messages, 
including those sent in response to leave group messages. A value between 1 and 25. 
The default is 1 second. 
Host Timeout 
This is the maximum amount of time in seconds allowed for a host to continue 
membership in a multicast group without the Switch receiving a host membership 
report. The default is 260. 
Route Timeout 
This is the maximum amount of time in seconds a route is kept in the forwarding table 
without receiving a membership report. The default is 260. 
Leave Timer 
This specifies the maximum amount of time in seconds between the Switch receiving 
a leave group message from a host, and the Switch issuing a group membership 
query. If no response to the membership query is received before the Leave Timer 
expires, the (multicast) forwarding entry for that host is deleted. 
Querier State 
Choose Enabled to enable transmitting IGMP Query packets or Disabled to disable. 
The default is Disabled. 
State  
This field can be toggled between Enabled and Disabled and enables or disables 
IGMP for the VLAN. The default is Disabled. 
Click Apply to implement the new settings. Click the Show All IGMP Group Entries link to return to the Current IGMP 
Snooping Group Entries window. 
Static Router Ports Entry 
 
Figure 6- 8.  Current Static Router Ports Entries window 
22