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D-Link DES-6500 Layer 3 Stackable Gigabit Ethernet Switch
28
Figure 4- 3. Port Trunking Group Entry Table
To configure port trunk groups, click the
Add
button to add a new trunk group and use the
menu
Link Aggregation Group Configuration
menu (see example below) to set up trunk
groups. To modify a port trunk group, double-click on it to bring up the
Link Aggregation
Group Configuration
menu. To delete a port trunk group, click the
Delete
option in the
Current Link Aggregation Group Entries
table.
Figure 4- 4. Link Aggregation Group Configuration
The user-changeable parameters are as follows:
Parameter
Description
Group ID
Select an ID number for the group.
Group Name
Type in a name for the group (optional).
Type
This pull-down menu allows you to select between Static and LACP (Link
Aggregation Control Protocol.)
LACP allows for the automatic detection of
links in a Port Trunking Group.
State
Trunk groups can be toggled between
Enabled
and
Disabled
. This is used
to turn a port trunking group on or off This is useful for diagnostics to
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D-Link DES-6500 Layer 3 Stackable Gigabit Ethernet Switch
29
to turn a port trunking group on or off. This is useful for diagnostics, to
quickly isolate a bandwidth intensive network device or to have an absolute
backup aggregation group that is not under automatic control.
Master Port
Choose the Master port for the trunk group.
Choose Member
Ports
Choose the members of a trunked group. Up to 8 ports per group can be
assigned to a group.
Flooding Port
A trunking group must designate one port to allow transmission of
broadcasts and unknown unicasts.
Configuring LACP Port Settings
To configure the LACP port settings, click the
LACP Port Settings
link to open the
Lacp
Settings
menu, as shown below.
Figure 4- 5. LACP Configuration
The user-changeable parameters are as follows:
Parameter
Description
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D-Link DES-6500 Layer 3 Stackable Gigabit Ethernet Switch
30
Unit
Select the module that contains the ports you want to configure LACP for.
The modules are numbered from 1 at the top (just below the CPU module),
to 8 (the slot farthest from the CPU module).
From
Select the first in a group of ports you want to configure LACP for.
To
Select the last in a group of ports you want to configure LACP for.
Mode
You can choose between
Passive
and
Active
LACP modes.
In the
Passive
mode, the port does not initiate the exchange of LACP
packets, but does understand the incoming LACP packets.
Links can only
be formed with ports that are running LACP in the
Active
mode.
In the
Active
mode, the port initiates the negotiation and will form links with
other ports if the other end is running LACP.
Configuring IGMP
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.
In order to use IGMP Snooping it must first be enabled for the entire Switch (see
Advanced
Settings
). You may then fine-tune the settings for each VLAN using the
IGMP Snooping
link in the
Configuration
folder. When enabled for IGMP snooping, the Switch can open or
close a port to a specific Multicast group member based on IGMP messages sent from the
device to the IGMP host or vice versa. The Switch monitors IGMP messages and discontinues
forwarding multicast packets when there are no longer hosts requesting that they continue.
IGMP Snooping
Use the IGMP Snooping Group Entry Table to view IGMP Snooping status. To modify
settings, click the Modify button for the VLAN ID you want to change.
Figure 4- 6. Current IGMP Snooping Group Entries
Clicking the
Modify
button will bring up the
IGMP Snooping Settings
menu.
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Figure 4- 7. IGMP Snooping Settings window
The following parameters may be viewed or modified:
Parameter
Description
Query Interval
The Query Interval field is used to set the time (in seconds) between
transmitting IGMP queries. Entries between 1 and 9,999 seconds are
allowed. Default = 125.
Max Response Time
This determines the maximum amount of time in seconds allowed before
sending an IGMP response report. The Max Response Time field allows
an entry between 1 and 25 (seconds).
Default = 10.
Robustness Variable
Adjust this variable according to expected packet loss. If packet loss on
the VLAN is expected to be high, the Robustness Variable should be
increased to accommodate increased packet loss. This entry field allows
an entry of 2 to 255. Default = 2.
Last Member Query
Interval
Specifies the maximum amount of time between group-specific query
messages, including those sent in response to leave group messages.
Default = 1.
Host Timeout
This is the maximum amount of time in seconds allowed for a host to
continue membership in a multicast group without the Switch receiving a
host membership report. Default = 260.
Route Timeout
This is the maximum amount of time in seconds a route is kept in the
forwarding table without receiving a membership report. Default = 260.
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Leave Timer
This specifies the maximum amount of time in seconds between the
Switch receiving a leave group message from a host, and the Switch
issuing a group membership query. If no response to the membership
query is received before the Leave Timer expires, the (multicast)
forwarding entry for that host is deleted.
Querier State
Choose
Querier
to enable transmitting IGMP Query packets or
Non-
Querier
to disable. The default value is
Non-Querier
.
State
Select
Enabled
to implement IGMP Snooping. This is
Disabled
by
default.
Static Router Ports
A static router port is a port that has a multicast router attached to it. Generally, this router
would have a connection to a WAN or to the Internet. Establishing a router port will allow
multicast packets coming from the router to be propagated through the network, as well as
allowing multicast messages (IGMP) coming from the network to be propagated to the router.
A router port has the following behavior:
All IGMP Report packets will be forwarded to the router port.
IGMP queries (from the router port) will be flooded to all ports.
All UDP multicast packets will be forwarded to the router port. Because routers do not
send IGMP reports or implement IGMP snooping, a multicast router connected to the
router port of the Layer 3 switch would not be able to receive UDP data streams unless
the UDP multicast packets were all forwarded to the router port.
A router port will be dynamically configured when IGMP query packets, RIPv2 multicast,
DVMRP multicast, PIM-DM multicast packets are detected flowing into a port.
Open the
IGMP
folder and the click on the
Static Router Ports Entry
link to open the
Current Static Router Ports Entries
page, as shown below.
Figure 4- 8. Current Static Router Ports Entries window
The
Current Static Router Ports Entries
page (shown above) displays all of the current
entries to the Switch’s static router port table.
To add or modify an entry, click the
Modify
button.
This will open the
Static Router Ports Settings
page, as shown below.

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