ZyXEL Communications ES-3124 User Manual page 92

ES-3124 Series User's Guide
Table 13 Port Setup (continued)
LABEL
Name
Type
Speed/Duplex
Flow Control
802.1p Priority This priority value is added to incoming frames without a (802.1p) priority queue tag.
BPDU Control
PD
(PWR models
only)
Apply
Cancel
92
DESCRIPTION
Enter a descriptive name that identifies this port.
This field displays 10/100M for an Ethernet/Fast Ethernet connection, 100M for an
Fast Ethernet connection and 10/100/1000M for Gigabit connections.
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).
Note: The connection type of an Fast Ethernet SFP port is fixed at
100M/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.
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.
See Priority Queue Assignment in
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.
This field is only available on the PWR models, but not available for the Gigabit or
mini-GBIC ports.
A powered device (PD) is a device such as an access point or a switch, that supports
PoE (Power over Ethernet) so that it can receive power from another device through a
10/100Mbps Ethernet port.
Select the check box to allow a powered device (connected to the port) to receive
power from the switch.
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.
Click Cancel to reset the fields.
Table 11 on page 83 for more information.
Chapter 7 Basic Setting