Chapter 7 Basic Setting

 

Table 12

Port Setup (continued)

 

LABEL

 

DESCRIPTION

 

Name

 

Enter a descriptive name that identifies this port. You can enter up to 64 alphanumeric

 

 

 

characters.

 

 

 

Note: Due to space limitation, the port name may be truncated in some

 

 

 

web configurator screens.

 

 

 

 

 

Type

 

This field displays 10/100/1000M (Gigabit) or 1000M (GBIC).

 

 

 

 

 

Speed/

 

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

 

Duplex

 

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

 

A concentration of traffic on a port decreases port bandwidth and overflows buffer

 

Control

 

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 this option to enable flow

 

 

 

control.

 

 

 

 

 

802.1P

 

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

 

Priority

 

Priority Queue Assignment in Switch Setup and Queuing Method for related

 

 

 

information.

 

 

 

 

 

BPDU

 

Configure the way to treat BPDUs received on this port.

 

Control

 

 

 

 

 

Note: 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 begin configuring this screen afresh.

 

 

 

 

 

81

GS-3012/GS-3012F User’s Guide