9-12
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 9 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Configuring Interface Speed and Duplex Mode
Ethernet interfaces on the switch operate at 10, 100, or 1000 Mbps and in either full- or half-duplex
mode. In full-duplex mode, two stations can send and receive traffic at the same time. Normally,
10-Mbps ports operate in half-duplex mode, which means that stations can either receive or send traffic.
Switch models include combinations of Fast Ethernet (10/100-Mbps) ports or Gigabit Ethernet SFP
standard and ES module slots supporting Gigabit SFP modules.
• You can configure interface speed on Fast Ethernet (10/100-Mbps) ports. You can configure duplex
mode to full, half, or autonegotiate on Fast Ethernet ports.
• You cannot configure speed or duplex mode on SFP ports, but you can configure speed to not
negotiate (nonegotiate) if connected to a device that does not support autonegotiation. However,
when a 1000BASE-T SFP module is in the SFP module port, you can configure speed as 10, 100, or
1000 Mbps or to autonegotiate, and you can configure duplex mode to auto or full.
Note ES ports do not support 10 or 100 Mbps operation. When a 1000BASE-T SFP module is
inserted in an ES module port, the speed defaults to 1000. Setting the speed to auto can
result in severe data loss if the interface is connected to a 10/100 interface on another switch.
These sections describe how to configure the interface speed and duplex mode:
• Configuration Guidelines, page 9-13
• Setting the Interface Speed and Duplex Parameters, page 9-13
Flow control Flow control is set to receive: off. It is always off for sent packets.
EtherChannel (PAgP) Disabled on all Ethernet ports. See Chapter 27, “Configuring
EtherChannels.”
Port blocking (unknown multicast
and unknown unicast traffic)
Disabled (not blocked) (Layer 2 interfaces only). See the
“Configuring Port Blocking” section on page 18-5.
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 18-3.
Protected port Disabled (Layer 2 interfaces only). See the “Configuring Protected
Ports” section on page 18-4.
Port security Disabled (Layer 2 interfaces only). See the “Default Port Security
Configuration” section on page 18-9. L2
Port Fast Disabled.
Automatic medium-
dependent-interface crossover
(Auto-MDIX)
Disabled.
Table 9-1 Default Layer 2 Ethernet Interface Configuration (continued)
Feature Default Setting
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