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ONFIGURING
THE
S
WITCH
3-84
- 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 IEEE 802.3x 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;
SFP – 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 3-85.
Note: Auto-negotiation must be disabled before you can configure or
force the interface to use the Speed/Duplex Mode or Flow
Control options.