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Page 81 / 160 Scroll up to view Page 76 - 80
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
69
Figure 6- 52.
Broadcast/Multicast Storm Control – Edit window
The BS/MS/DLF Upper Threshold sets the rate of broadcast/multicast/destination lookup fail packets received on a port or
group of ports that will trigger the action to be taken by the switch, as detailed below. A range of thousands of packets
received per second (Kpps) between 0 and 255 can be specified.
When a port or group of ports receives more broadcast, multicast, or destination lookup fail packets per second than is
specified in the respective Upper Threshold (0-255 Kpps)
field, the switch will take the actions specified in the Broadcast
Storm Mode, Multicast Storm Mode, and the Destination Lookup Fail
pull-down menus.
The Broadcast Storm Mode is
Enabled
or
Disabled
using a pull-down menu. When the Broadcast Storm Mode is
Enabled
,
and a port contained within the corresponding port group receives more broadcast packets than specified in the Upper
Threshold (0-255 Kpps) field, the switch will drop all broadcast packets received by any port in the port group until the rate
of broadcast packets received by the port group falls.
The Multicast Storm Mode is
Enabled
or
Disabled
using a pull-down menu. When the Multicast Storm Mode is
Enabled
,
and a port contained within the corresponding port group receives more multicast packets than specified in the Upper
Threshold (0-255 Kpps) field, the switch will drop all multicast packets received by any port in the port group until the rate
of multicast packets received by the port group falls.
The Destination Lookup Fail is
Enabled
or
Disabled
using a pull-down menu. When the Destination Lookup Fail is
Enabled
, and a port contained within the corresponding port group receives more destination lookup failed packets than
specified in the Upper Threshold (0-255 Kpps)
field, the switch will drop all destination lookup failed packets received by
any port in the port group until the rate of destination lookup failed packets received by the port group falls.
Configure QOS
The DGS-3224TGR supports 802.1p priority queuing. The switch has eight priority queues. These priority queues are
numbered from 0 — the lowest priority queue — to 7 — the highest priority queue. The eight priority queues specified in
IEEE 802.1p (Q0 to Q7) are mapped to the switch’s priority queues as follows:
Q0 is assigned to the switch’s Q2 queue.
Q1 is assigned to the switch’s Q0 queue.
Q2 is assigned to the switch’s Q1 queue.
Q3 is assigned to the switch’s Q3 queue.
Page 82 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
70
Q4 is assigned to the switch’s Q4 queue.
Q5 is assigned to the switch’s Q5 queue.
Q6 is assigned to the switch’s Q6 queue.
Q7 is assigned to the switch’s Q7 queue.
For strict priority-based scheduling, any packets residing in the higher priority queues are transmitted first. Only when these
queues are empty, are packets of lower priority transmitted.
For weighted round-robin queuing, the number of packets sent from each priority queue depends upon the assigned weight.
For a configuration of eight CoS queues, A~H with their respective weight value: 8~1, the packets are sent in the following
sequence: A1, B1, C1, D1, E1, F1, G1, H1, A2, B2, C2, D2, E2, F2, G2, A3, B3, C3, D3, E3, F3, A4, B4, C4, D4, E4, A5,
B5, C5, D5, A6, B6, C6, A7, B7, A8, A1, B1, C1, D1, E1, F1, G1, H1.
For weighted round-robin queuing, if each CoS queue has the same weight value, then each CoS queue has an equal
opportunity to send packets just like round-robin queuing.
For weighted round-robin queuing, if the weight for a CoS is set to 0, then it will continue processing the packets from this
CoS until there are no more packets for this CoS. The other CoS queues that has been given a nonzero value, and depending
upon the weight, they will follow a common weighted round-robin scheme.
Remember that the DGS-3224TGR has eight priority queues (and thus eight Classes of Service) for each port on the switch.
QOS Output Scheduling
Figure 6- 53.
QOS Output Scheduling window
Page 83 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
71
802.1p Default Priority
The switch allows the assignment of a default 802.1p priority to each port on the switch.
Figure 6- 54.
802.1p Default Priority window
This window allows you to assign a default 802.1p priority to any given port on the switch. The priority queues are
numbered from 0
−
the lowest priority
−
to 7
−
the highest priority.
Page 84 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
72
802.1p User Priority
The DGS-3224TGR allows the assignment of a User Priority to each of the 802.1p priorities.
Figure 6- 55.
802.1p User Priority window
Bandwidth Control Table
The bandwidth control settings are used to place a ceiling on the transmitting and receiving data bit rates for any port.
Page 85 / 160
DGS-3224TGR Gigabit Ethernet Switch User’s Guide
73
Figure 6- 56.
Bandwidth Control Table window
To change the maximum allowed bandwidth for a given port in the
Bandwidth Control Table
window, click the selection
button in the far left column that corresponds to the port you want to configure and click the
Edit
button. A new window
opens:
Figure 6- 57.
Bandwidth Control Table – Edit window
To limit either the Rx or Tx rates, deselect the No Limit check box and enter the desired rate. Rates can be expressed using
whole numbers up to the maximum available rate for the port.
Access Profile Mask Setting
Access profiles allow you to establish criteria to determine whether or not the switch will forward packets based on the
information contained in each packet’s header. These criteria can be specified on a basis of VLAN, MAC address or IP
address.

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