ZyXEL Communications Dimension GS-3012, User Manual, Page: 77 / 259

GS-3012/GS-3012F User’s Guide
Basic Setting 6-13
Table 6-5 Port Setup
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 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
Priority This priority value is added to incoming frames without a (802.1p) priority queue tag. See Priority
Queue Assignment in Table 6-3 for more information. See also Priority Queue Assignment in
Switch Setup and Queuing Method for related 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 back to the switch.
Cancel Click Cancel to begin configuring this screen afresh.