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Auto Negotiation
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.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 and resend later.
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.
Note: 1000 Base-T does not support force mode.
5.4.1.
General Settings
5.4.1.1.
CLI Configuration
Node
Command
Description
enable
show interface IFNAME
This command displays the current port
configurations.
enable
configure terminal
This command changes the node to
configure node.
configure interface IFNAME
This command enters the interface
configure node.
interface show
This command displays the current port
configurations.
interface loopback (none| mac)
This command tests the loopback mode
of operation for the specific port.
interface flowcontrol (off | on)
This command
disables
/
enables
the
flow control for the port.
interface speed (auto|10-full | 10-full-n |
10-half | 10-half-n | 100-full |
This command configures the speed and
duplex for the ports.