Chapter 6 Basic Setting

Table 13 Port Setup (continued)

LABEL

DESCRIPTION

Flow Control

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 back pressure 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.

 

 

802.1P Priority

This priority value is added to incoming frames without a (802.1p) priority queue tag.

 

See Priority Queue Assignment in Table 11 on page 68 for more information.

 

 

BPDU Control

Configure the way to treat BPDUs received on this port. You must activate bridging

 

control protocol transparency in the Switch Setup screen first.

 

Select Peer to process any BPDU (Bridge Protocol Data Units) received on this port.

 

Select Tunnel to forward BPDUs received on this port.

 

Select Discard to drop any BPDU received on this port.

 

Select Network to process a BPDU with no VLAN tag and forward a tagged BPDU.

 

 

Ports 17, 18

 

 

 

Port

This is the port index number.

 

 

Active

Select this check box to enable a port. The factory default for all ports is enabled. A

 

port must be enabled for data transmission to occur.

 

 

Name

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.

 

 

Type

This field displays 10/100/1000M for the Gigabit/ mini GBIC combo ports or 1000M for

 

the mini GBIC ports.

 

 

Speed/Duplex

Select the speed and the duplex mode of the connection on this port. Choices are

 

Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex

 

and 1000M/Full Duplex.

 

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.

74

 

VES-1616F-3x Series User’s Guide