ES-2048 User’s Guide

 

Table 12 Port Setup (continued)

 

 

 

 

LABEL

DESCRIPTION

 

 

 

 

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 10/100M for an Ethernet/Fast Ethernet connection and 10/100/

 

 

1000M for Gigabit connections.

 

Speed/Duplex

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 (for Gigabit ports 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.

 

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 IEEE802.3x flow control in full duplex mode and backpressure flow

 

 

control in half duplex mode.

 

 

IEEE802.3x 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 10 on page 72 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.

 

 

 

 

Apply

Click Apply to save your changes to the switch’s run-time memory. The switch loses

 

 

these changes if it is turned off or loses power, so use the Save link on the top

 

 

navigation panel to save your changes to the non-volatile memory when you are done

 

 

configuring.

 

Cancel

Click Cancel to reset the fields.

 

 

 

Chapter 7 Basic Setting

79