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DGS-3224TGR Gigabit Ethernet Switch User’s Guide
64
Priority (0-61440) <
32768
>
A Bridge Priority can be from
0
to
61440
. Zero is equal to the highest Bridge
Priority.
STP Version
Choose
RSTP
(default) or
STP compatible
. Both versions use STP parameters
in the same way. RSTP is fully compatible with IEEE 802.1d STP and will
function with legacy equipment.
TX Hold Count (1-10) <
3
>
This is the maximum number of Hello packets transmitted per interval. The
count can be specified from
1
to
10
. The default value is
3.
Forwarding BPDU
This drop-down menu allows you to configure whether to forward BPDU when
the Spanning Tree Protocol is disabled.
STP Port Settings
Figure 6- 45.
STP Port Settings window
To configure Spanning Tree Protocol functions for individual ports, enter the desired information in the fields on this
window and then click
Apply
.
Page 77 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
65
The STP Port settings are described as follows:
Parameter
Description
From __ To
__
A consecutive group of ports may be configured starting with the selected port.
State
The Spanning Tree Protocol state for a selected port can either be
Enabled
or
Disabled
.
Cost
A Port Cost can be set from
1
to
200000000
. The lower the number, the greater
the probability the port will be chosen to forward packets. Default port cost:
100Mbps port = 19, Gigabit ports = 4.
Priority
A Port Priority can be from
0
to
240
. The lower the number, the greater the
probability the port will be chosen as the Root Port.
Migrate
Select
Yes
or
No
. Choosing
Yes
will enable the port to migrate from 802.1d STP
status to 802.1w RSTP status. RSTP can coexist with standard STP, however
the benefits of RSTP are not realized on a port where an 802.1d network
connects to an 802.1w enabled network. Migration should be enabled (
Yes
) on
ports connected to network stations or segments that will be upgraded to 802.1w
RSTP on all or some portion of the segment
Edge
Select
Yes
or
No.
Choosing
Yes
designates the port as an edge port. Edge ports
cannot create loops, however an edge port can lose edge port status if a
topology change creates a potential for a loop. An edge port normally should not
receive BPDU packets. If a BPDU packet is received it automatically loses edge
port status.
No
indicates the port does not have edge port status.
P2P
Select
Yes
,
No,
or
Auto
. Choosing
Yes
indicates a point-to-point (p2p) shared
link. These are similar to edge ports however they are restricted in that a p2p
port must operate in full duplex. Like edge ports, p2p ports transition to a
forwarding state rapidly thus benefiting from RSTP. The
Auto
setting instructs
the switch to force a connection to a non-P2P port when it detects 1 or more
BPDUs.
Forwarding
Configuration menus for MAC Address Forwarding including Multicast and Unicast forwarding can be found in the
Forwarding
folder. The MAC Address Aging Time and Broadcast/Multicast Storm Control menus are located here as well.
MAC Address Aging Time
Figure 6- 46.
MAC Address Aging Time window
Page 78 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
66
Set the MAC Address Aging Time and click the
Apply
button. MAC Address Aging Time specifies the length of time a
learned MAC Address will remain in the forwarding table without being accessed (that is, how long a learned MAC
Address is allowed to remain idle). The Aging Time can be set to any value between 10
and 1,000,000 seconds.
NOTE:
A very long Aging Time can result with the out-of-date Dynamic Entries
that may cause incorrect packet filtering/forwarding decisions. A very short
aging time may cause entries to be aged out to soon, resulting in a high
percentage of received packets whose source addresses cannot be found in
the address table, in which case the switch will broadcast the packet to all
ports, negating many of the benefits of having a switch.
Unicast MAC Address Settings
Figure 6- 47.
Unicast MAC Address Settings window
To modify a unicast MAC address on the table above, select it and then click
Edit
.
To add a unicast MAC address to the table above, click
New
.
Figure 6- 48.
Unicast MAC Address Settings – Add window
The following fields can be set:
Parameter
Description
MAC Address
Allows the entry of the MAC address of an end station that will be entered into the
switch’s static forwarding table when adding a new entry.
Displays the currently
selected MAC address when editing.
Page 79 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
67
VLAN Name
Allows the entry of the VLAN Name of the VLAN the MAC address below is a member
of
−
when editing. Displays the VLAN the currently selected MAC address is a member
of
−
when editing an existing entry.
Type
This is the type of the Unicast MAC Address entry.
Port
Allows the entry of the port number on which the MAC address entered above resides.
Multicast MAC Address Settings
Multicast MAC addresses can be statically entered into the switch’s MAC Address Forwarding Table. These addresses will
never age out.
Figure 6- 49.
Multicast MAC Address Settings window
Click
New
to add multicast MAC addresses to the table above. To make changes to an existing entry, select the entry on the
table above and click
Edit
.
Figure 6- 50.
Multicast MAC Address Settings – Add window
The following fields can be set:
Parameter
Description
MAC Address
Allows the entry of the MAC address of an end station that will be entered into the
switch’s static forwarding table.
VLAN Name
Allows the entry of the VLAN name of the VLAN the MAC address below is a member
of
−
when adding a new entry to the table. Displays the VLAN name of the VLAN the
MAC address is a member of
−
when editing an existing entry.
Page 80 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
68
Port
Allows the entry of the port number on which the MAC address entered above
resides.
None
Specifies the port as being none.
Egress
Specifies the port as being a source of multicast packets originating from the MAC
address specified above.
Broadcast/Multicast Storm Control
Broadcast and multicast storms consist of broadcast or multicast packets that flood and/or are looped on a network causing
noticeable performance degradation and, in extreme cases, network failure.
The DGS-3224TGR allows some control over broadcast/multicast storms by setting thresholds on the number of
broadcast/multicast packets received (in thousands of packets per second or Kpps), and then following a user-specified
course of action when this threshold is exceeded.
Figure 6- 51.
Broadcast/Multicast Storm Control window

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