3com 5104M-FIB User Manual

SET BPORT_MAU DUPLEX_MODE

2-89

SET BPORT_MAU
DUPLEX_MODE

Use the SET BPORT_MAU DUPLEX_MODE command to enable simultaneous
two-way data flow on a 100BASE-FX SwitchModule MAU. By default, Fast
Ethernet SwitchModule ports run in half-duplex mode.

Full-duplex mode disables Carrier Sense Multiple Access/Collision Detection
(CSMA/CD), so enable full-duplex mode only when the SwitchModule MAU is
connected to a single device (no collision domain exists).

When autonegotiation is enabled on a 100BASE-TX SwitchModule, 100BASE-TX
SwitchModule MAUs are capable of changing to full-duplex mode automatically.
If autonegotiation is disabled on a 100BASE-TX SwitchModule, you can use the
SET BPORT_MAU DUPLEX_MODE command to manually set the 100BASE-TX
MAU to full-duplex mode.

Format

Example

The following command enables full-duplex mode on mau 1 of port 4 on a
100BASE-FX SwitchModule in slot 2:

CB5000> set bport_mau 2.4.1 duplex_mode full

Related Command

SHOW BPORT_MAU

set bport_mau

duplex_mode

full

half

slot.all

slot.port.mau

Identifies the MAU for this operation.

slot

(1 through 17) is the slot number and port (1 through 4) is the

port number. The mau variable may be 1 or 2 (for redundant ports).
For example, to identify MAU 1 on port 4 on the module in slot 6,
enter

6.4.1

slot.all

Specifies that all MAUs in the slot are affected by this operation.

full

Enables full-duplex mode on the MAU.

half

Enables half-duplex mode on the MAU.