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DES-1210G Fast Ethernet/Gigabit Ethernet Switch User's Guide
Software Features
The device provides the ability to configure the port speed, flow control, link aggregation, port
monitor, 802.1p priority queues, and VLAN group.
Port Speed
You can select the desired Speed and Duplex for each port. Possible settings include: Auto, 10F,
10H, 100F, 100H and 1000F for the two 1000BASE-SX ports, where the number 10, 100, or 1000
is the speed in Mbps, and the H or F designates half-duplex or full-duplex. Choosing Auto enables
autonegotiation, Nway, to automatically configure the port speed. The port speed default setting
is Auto.
Flow Control
Toggles flow control Enable or Disable. It is useful during periods of heavy network activity when
the Switch's buffers can receive too much traffic and fill up faster than the Switch can forward
the information. In such cases, the Switch will intervene and tell the transmitting device to pause
to allow the information in the port buffer to be sent. The flow control default setting is Enable.
Port Trunk Groups
The Switch supports the use of port trunk groups. Up to three port trunk groups can be utilized.
You can select ports 1-2, 1-3, or 1-4 as the member ports for Trunk Group 1, select ports 5-6, 5-7
or 5-8 as the member ports for Trunk Group 2 and select ports 9-10 as the member ports for
Trunk Group 3. See the discussion of Port Trunk Groups in Chapter 6 for more information
about port trunk groups. A total bit rate of up to 800 Mbps is possible with ports 1x-4x assigned
to Trunk Group 1.
Port Monitor
Allows you to select a port to monitor activity for analysis. The Monitored Port will mirror all
activity to the Monitoring Port. This feature is useful for analyzing traffic in ports where acute
traffic congestion or other problems may exist.
Priority Queues
This feature allows you to customize packet traffic handling to the particular needs of your
network. Configure this setting for packets passing through the port, using IEEE 802.1p priority
tagging. These settings are universal, that is, they are for all ports on the Switch. Four priority
levels may be assigned with Queue 3 being the highest priority queue, and Queue 0 being the
lowest priority queue. Note: The settings you assign to the queues, numbers 0-7, represent
the IEEE 802.1p priority tag number. Do not confuse these settings with port numbers.
The highest priority queue, Queue 3, should reserved for data in which latency can have adverse
affects on the function of an application, such as video or audio data, where latency can produce
distorted sounds and images. Packets in the lower priority queues will be processed with less
urgency. See the discussion on IEEE 802.1p Priority and management of priority queues in
Chapter 6.
Figure 5-2 shows how priority queues might be assigned.
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