D-Link DGS-1210-20 User Manual

  

D-Link Web Smart Switch User Manual

 

The settings of IGMP snooping is set by each VLAN individually.  

 

By default, IGMP is disabled. If enabled, the IGMP Global Settings will need to be entered: 
 
Host Timeout (130-153025 sec):

 This is the interval after which a learned host port entry will be purged. For 

each host port learned, a 'Port Purge Timer' runs for 'Host Port Purge Interval'. This timer will be restarted 
whenever a report message from host is received over that port. If no report messages are received for 'Host 
Port Purge Interval' time, the learned host entry will be purged from the multicast group. The default value is 
260 seconds. 
Robustness Variable (2-255 sec):

 The Robustness Variable allows adjustment for the expected packet loss 

on a subnet.  If a subnet is expected to be lossy, the Robustness Variable may need to be increased.  The 
Robustness Variable cannot be set to zero, and it SHOULD NOT be.  Default is 2 seconds. 
Query Interval (60-600 sec):

 T

eral Queries sent. By adjusting 

the Query Interval, the number of 

larger values will cause 

 This is the interval after which a learned router port entry will be purged. For 

server is notified that there are no more 

he Query Interval is the interval between Gen

IGMP messages can be increased or decreased; 

IGMP Queries to be sent less often. Default value is 125 seconds. 
R
each router port learned, a 'Router Port Purge Timer' runs for 'Router Port Purge Interval'. This timer will be 
restarted whenever a Query control message is received over that port. If there are no Query control 
messages received for 'Router Port Purge Interval' time, the learned router port entry will be purged. Default 
is 260 seconds.  
Last Member Query Interval (1-25 sec):

 The Last Member Query Interval is the Max Response Time 

inserted into Group-Specific Queries sent in response to Leave Group messages, and is also the amount of 
time between Group-Specific Query messages. This value may be adjusted to modify the "leave latency" of 
the network. A reduced value results in reduced time to detect the loss of the last member of a group. Default 
is 1 second. 
Max Response Time (10-25 sec):

 The Max Response Time specifies the maximum allowed time before 

sending a responding report message. Adjusting this setting effects the "leave latency", or the time between 
the moment the last host leaves a group and when the multicast 
members.  It also allows adjustments for controlling the frequency of IGMP traffic on a subnet. Default is 10 
seconds. 
 
To enable IGMP snooping for a given VLAN, select enable and click on the Apply button. Then press the 
VLAN ID 

number under IGMP Snooping VLAN Setting, and select the State, Querier State and Fast Leave 

to be enabled or disabled, and the ports to be assigned as router ports for IGMP snooping for the VLAN. 
Press Apply for changes to take effect. A router port configured manually is a Static Router Port, and a 
Dynamic Router Port

 is dynamically configured by the Switch when a query control message is received.