Chapter 7 Basic Setting

 

Table 12 Basic Setting > Port Setup (continued)

 

LABEL

DESCRIPTION

 

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.

 

 

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 74 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 begin configuring this screen afresh.

 

 

 

 

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GS-3012/GS-3012F User’s Guide