D-Link DES-1210-52 Product Manual - Page 49

Last Member Query Interval 1-25 sec, Max Response Time 10-25 sec

Page 49 highlights

5 Configuration D-Link Web Smart Switch User Manual Passive - LACP ports that are designated as passive cannot initially send LACP control frames. In order to allow the linked port group to negotiate adjustments and make changes dynamically, one end of the connection must have "active" LACP ports. Timeout: Specify the administrative LACP timeout. The possible field values are: Short (3 Sec) - Defines the LACP timeout as 3 seconds. Long (90 Sec) - Defines the LACP timeout as 90 seconds. This is the default value. Click Apply to implement the changes made. Configuration > IGMP Snooping With Internet Group Management Protocol (IGMP) snooping, the Web Smart Switch can make intelligent multicast forwarding decisions by examining the contents of each frame's Layer 2 MAC header. IGMP snooping can help reduce cluttered traffic on the LAN. With IGMP snooping enabled globally, the Web Smart Switch will forward multicast traffic only to connections that have group members attached. The settings of IGMP snooping is set by each VLAN individually. Figure 76 - Configuration > IGMP Snooping Configuration 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): 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. 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 no Query control messages are 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 server is notified that there are no more 43

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5
Configuration
D-Link Web Smart Switch User Manual
Passive -
LACP ports that are designated as passive cannot initially send LACP control frames. In
order to allow the linked port group to negotiate adjustments and make changes dynamically, one
end of the connection must have "active" LACP ports.
Timeout:
Specify the administrative LACP timeout. The possible field values are:
Short (3 Sec)
- Defines the LACP timeout as 3 seconds.
Long (90 Sec)
- Defines the LACP timeout as 90 seconds. This is the default value.
Click
Apply
to implement the changes made.
Configuration > IGMP Snooping
With Internet Group Management Protocol (IGMP) snooping, the Web Smart Switch can make intelligent
multicast forwarding decisions by examining the contents of each frame’s Layer 2 MAC header.
IGMP snooping can help reduce cluttered traffic on the LAN. With IGMP snooping enabled globally, the Web
Smart Switch will forward multicast traffic only to connections that have group members attached.
The settings of IGMP snooping is set by each VLAN individually.
Figure 76 – Configuration > IGMP Snooping Configuration
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):
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.
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 no Query control messages are
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 server is notified that there are no more
43