4 Web-based Switch Configuration
D-Link DGS-2000 Series Ethernet Switch User Manual
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learned host entry will be purged from the multicast group. The
default value is 260 seconds.
Router Timeout
(60-600 sec)
This is the interval after which a learned router port entry will be
purged. For 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 were no Query control messages received for 'Router Port
Purge Interval' time, the learned router port entry will be purged.
Default is 260 seconds.
Max Learned Entry
Value
(1-1024)
The maximum IGMP group(s) allowed to be learned for entire
system. The range from 1 to 1024 groups. The default value is 1024
groups.
IGMP Snooping Rate
Limit
Used to control if system has the maximum process limit especially
for IGMP packet (IGMP report, IGMP leave and IGMP query). Lower
rate helps to lower the CPU loading.
Rate Limit Value
is a range
from 1-200 in PPS.
Clicking
Apply
button for apply the changes.
Click
IGSEdit
button to enter the IGMP Parameters Settings page.
Figure 4.66 – Configuration > IGMP Snooping > IGMP Snooping Parameters Settings
Parameters
Description
State
Used to control IGMP snooping state for this particular VLAN group. The
state
Enabled
/
Disabled
can be selected in drop-down list.
Robustness Variable
(2-255 sec)
The Robustness Variable allows adjustment for the expected packet loss on
network. The larger robustness variable help to prevent packet lost occurred
in network; the key types of packet for IGMP: report, leave and query. The
Robustness Variable cannot be set to zero, and it SHOULD NOT be. Default
is 2 seconds
Query Interval
(60-600 sec)
The Query Interval is the interval between General Queries sent. By
adjusting the Query Interval, the number of IGMP messages can be
increased or decreased; larger values will cause IGMP Queries to be sent
less often. Default value is 125 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
