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Table 17 Basic Setting > Port Setup (continued)
LABEL
Name
Type
Speed/Duplex
Rate Limit
Profile
per Port
per Queue
Flow Control
802.1p Priority This priority value is added to incoming frames without a (802.1p) priority queue tag. See
VES1724-56 User's Guide
DESCRIPTION
Enter a descriptive name that identifies this port. You can enter up to 64 alpha-numerical
characters.
Note: Due to space limitation, the port name may be truncated in some Web Configurator
screens.
This field displays 10/100M for Fast Ethernet connections and 10/100/1000M for Gigabit
connections.
Select the speed and the duplex mode of the Ethernet connection on this port. Choices are
Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex and
1000M/Full Duplex (Gigabit connections only).
Selecting Auto (auto-negotiation) allows one port to negotiate with a peer port automatically
to obtain the connection speed and duplex mode that both ends support. When auto-
negotiation is turned on, a port on the Switch negotiates with the peer automatically to
determine the connection speed and duplex mode. If the peer port does not support auto-
negotiation or turns off this feature, the Switch determines the connection speed by detecting
the signal on the cable and using half duplex mode. When the Switch's auto-negotiation is
turned off, a port uses the pre-configured speed and duplex mode when making a connection,
thus requiring you to make sure that the settings of the peer port are the same in order to
connect.
These fields display the rate limit profile names you configure in the Rate Limit Profile
Setup screens. Refer to
Section 8.10 on page 84
Select a rate limit profile from the drop-down list box. You can define the maximum incoming
and outgoing transmission data rate on a per-port basis.
Select a per queue rate limit profile from the drop-down list box. You can define the maximum
incoming and outgoing transmission data rate on a per-queue basis.
A concentration of traffic on a port decreases port bandwidth and overflows buffer memory
causing packet discards and frame losses. Flow Control is used to regulate transmission of
signals to match the bandwidth of the receiving port.
The Switch uses IEEE 802.3x flow control in full duplex mode and backpressure flow control in
half duplex mode.
IEEE 802.3x flow control is used in full duplex mode to send a pause signal to the sending
port, causing it to temporarily stop sending signals when the receiving port memory buffers
fill.
Back Pressure flow control is typically used in half duplex mode to send a "collision" signal to
the sending port (mimicking a state of packet collision) causing the sending port to
temporarily stop sending signals and resend later. Select Flow Control to enable it. This field
is available for an Ethernet port only.
Priority Queue Assignment in
for more information.
Table 12 on page 75
for more information.
Chapter 8 Basic Setting
83
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