D-Link xStack DGS-3420 Series Reference Manual page 117

xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch Web UI Reference Guide
The fields that can be configured are described below:
Parameter
Query Interval (1-65535)
Max Response Time (1-
25)
Robustness Value (1-7)
Last Member Query
Interval (1-25)
Data Driven Group
Expiry Time
Proxy Reporting Source
IP
Proxy Reporting State
Querier State
Fast Leave
State
Data Driven Learning
State
Data Driven Learning
Aged Out
Version
Click the Apply button to accept the changes made.
Click the <<Back button to discard the changes made and return to the previous page.
After clicking the Modify Router Port
Description
Specify the amount of time in seconds between general query transmissions. The
default setting is 125 seconds..
Specify the maximum time in seconds to wait for reports from members. The
default setting is 10 seconds.
Provides fine-tuning to allow for expected packet loss on a subnet. The value of the
robustness value is used in calculating the following IGMP message intervals: By
default, the robustness variable is set to 2.
Specify the maximum amount of time between group-specific query messages,
including those sent in response to leave-group messages. You might lower this
interval to reduce the amount of time it takes a router to detect the loss of the last
member of a group.
Specifies the data driven group lifetime value used. This value is only applicable if
the aged out option is enabled.
Enter the proxy reporting source IP address.
Use the drop-down menu to enable and disable the proxy report state.
If this state is enable, it allows the Switch to be selected as an IGMP Querier that
sends IGMP query packets. If this state is disabled, then the Switch will not play the
role as a Querier.
Enable or disable the IGMP snooping fast leave function. If enabled, the
membership is immediately removed when the system receive the IGMP leave
message.
Used to enable or disable IGMP snooping for the specified VLAN. This option is
disabled by default.
NOTE: that if the Layer 3 router connected to the switch provides only the IGMP
proxy function but does not provide the multicast routing function, then this
state must be configured as disabled. Otherwise, if the Layer 3 router is not
selected as the querier, it will not send the IGMP query packet. Since it will
not also send the multicast-routing protocol packet, the port will be timed out
as a router port.
Specifies to enable or disable the data driven learning of an IGMP snooping group.
When data-driven learning is enabled for a VLAN, when the switch receives IP
multicast traffic on this VLAN, an IGMP snooping group will be created. The
learning of an entry is not activated by an IGMP membership registration, but
activated by traffic. For an ordinary IGMP snooping entry, the IGMP protocol will
take care of the aging out of the entry. For a data-driven entry, the entry can be
specified not to aged out by the aged timer. When data driven learning is enabled
and the data driven table is not full, the multicast filtering mode for all ports will be
ignored. The multicast packets will be forwarded to router ports. If the data driven
learning table is full, multicast packets will be forwarded according to the multicast
filtering mode. Note that if a data-driven group is created and IGMP member ports
are learned later on, the entry will become an ordinary IGMP snooping entry. The
aging out mechanism will follow the ordinary IGMP snooping entry.
Specifies that the aging out of the entry will be enabled or disabled.
Specify the version of IGMP packet that will be sent by this port. If an IGMP packet
received by the interface has a version higher than the specified version, this
packet will be forwarded from the router ports or VLAN flooding.
link, the following page will appear:
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