Spanning Tree - D-Link DGS-3224TG User Manual

Internet Group Management Protocol (IGMP) snooping allows the switch to recognize IGMP queries and
reports sent between network stations or devices and an IGMP host. When enabled for IGMP snooping,
the switch can open or close a port to a specific device based on IGMP messages passing through the
switch.
To set up IGMP snooping, enter a VLAN ID number in the first field and change the State field to
Enabled. Next, select the desired setting in the Querier State field—this determines the version of
IGMP that is used in your network—and enter values in the following three fields. A value between 1
and 255 can be entered for the Robustness Variable (default is 2). The Query Interval can be set
between 1 and 65500 seconds. This sets the time between IGMP queries. The Max Response allows a
setting between 1 and 25 seconds and specifies the maximum amount of time allowed before sending a
response report. Click APPLY to make the settings effective.
The user-changeable parameters in the switch are as follows:
•
VLAN ID/VID – Enter a VLAN ID number in this field.
•
State – Use the drop-down menu to enable or disable IGMP settings.
•
Querier State – Select from Non-Querier, V1-Querier, and V2-Querier. This is used to specify the
IGMP version (1 or 2) that will be used by the IGMP interface when making queries.
•
Robustness Variable – A tuning variable to allow for sub-networks that are expected to lose a large
number of packets. A value between 1 and 255 can be entered, with larger values being specified for
sub-networks that are expected to lose larger numbers of packets.
•
Query Interval – Allows the entry of a value between 1 and 65500 seconds, with a default of 125
seconds. This specifies the length of time between sending IGMP queries.
•
Max Response – Sets the maximum amount of time allowed before sending an IGMP response
report. A value between 1 and 25 seconds can be entered.
•
Add/Modify – Click this hyperlink to add or modify an IGMP entry on this window.
•
VLAN Name – The name you have assigned to a specified VLAN.
•
Age-Out – The time-out for entries on this table.
•
Delete – Click this hyperlink to delete an IGMP entry on this window.

Spanning Tree

This section includes two windows, STP Switch Settings and STP Port Settings.
STP Switch Settings
The switch supports 801.2d Spanning Tree Protocol, which allows you to create alternative paths (with
multiple switches or other types of bridges) in your network. See the Spanning Tree Algorithm section of
the "Switch Management and Operating Concepts" chapter for a detailed explanation.
DGS-3224TG Gigabit Ethernet Switch User's Guide
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