C
ONFIGURING
THE
S
WITCH
3-94
stations or segments connected directly to the swi tch 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.)
(Default: Autonegotiation enabled; Advertised capabilities for
1000BASE-T – 10half, 10full, 100half, 100full, 1000full;
1000BASE-SX/LX/LH – 1000full)
Forced Mode – Shows the forced/preferred port type to use for the
combination ports
9-12.
- Copper-Forced - Always uses the built-in RJ-45 port.
-
Copper-Preferred-Auto
- Uses the built-in RJ-45 port if both
combination types are functioning and the RJ-45 port has a valid link.
-
SFP-Forced
- Always uses the SFP port (even if module is not
installed).
-
SFP-Preferred-Auto
- Uses SFP port if both combination types are
functioning and the SFP port has a valid link.
Trunk – Indicates if a port is a member of a trunk. To create trunks
and select port members, see “Creating Trunk Groups” on page 3-96.
Note: Auto-negotiation must be disabled before you can configure or
force the interface to use the Speed/Duplex Mode or Flow
Control options.