P
ORT
C
ONFIGURATION
2-33
•Flow Control* – Allows you to manually enable or disable
flow control.
•Autonegotiation (Port Capabilities) – Allows
auto-negotiation to be enabled/disabled. When
auto-negotiation is enabled, you need to specify the capabilities
to be advertised. When auto-negotiation is disabled, you can
force the settings for speed, mode, and flow control.The
following capabilities are supported.
- 10half - Supports 10 Mbps half-duplex operation
- 10full - Supports 10 Mbps full-duplex operation
- 100half - Supports 100 Mbps half-duplex operation
- 100full - Supports 100 Mbps full-duplex operation
- 1000full - Supports 1000 Mbps full-duplex operation
- Sym (Gigabit only) - Check this item to transmit and receive
pause frames, or clear it to auto-negotiate the sender and
receiver for asymmetric pause frames. (The current switch
chip only supports symmetric pause frames.)
- FC - Supports flow control
- Flow control can eliminate frame loss by “blocking” traffic
from end stations or segments connected directly to the
switch when its buffers fill. When enabled, back pressure is
used for half-duplex operation and IEEE802.3x for
full-duplex operation. (Avoid using flow control on a port
connected to a hub unless it is actually required to solve a
problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the
hub.)
•Trunk – Indicates if a port is a member of a trunk. To create
trunks and select port members, see “Port Trunk Configuration”
on page 2-79.
*Auto-negotiation must be disabled before you can configure or force the
interface to use the Speed/Duplex Mode or Flow Control options.