P
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C
ONFIGURATION
2-39
- 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
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
100BASE-TX – 10half, 10full, 100half, 100full; 1000BASE-T –
10half, 10full, 100half, 100full, 1000full;
1000BASE-SX/LX/LH – 1000full)
• Trunk – Indicates if a port is a member of a trunk. To create
trunks and select port members, see “Port Trunk Configuration”
on page 2-100.
Note: Autonegotiation must be disabled before you can configure
or force the interface to use the Speed/Duplex Mode or
Flow Control options.
b_mgmt.book Page 39 Tuesday, July 8, 2003 5:24 PM
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