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10-10
Catalyst 2960 Switch Software Configuration Guide
78-16881-01
Chapter 10 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, Gigabit Ethernet
(10/100/1000-Mbps) ports, and small form-factor pluggable (SFP) module slots supporting SFP
modules.
These sections describe how to configure the interface speed and duplex mode:
• Speed and Duplex Configuration Guidelines, page 10-11
• Setting the Type of a Dual-Purpose Uplink Port, page 10-11
• Setting the Interface Speed and Duplex Parameters, page 10-13
VLAN trunking Switchport mode dynamic auto (supports DTP).
Port enable state All ports are enabled.
Port description None defined.
Speed Autonegotiate.
Duplex mode Autonegotiate.
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 30, “Configuring
EtherChannels.”
Port blocking (unknown multicast
and unknown unicast traffic)
Disabled (not blocked). See the “Configuring Port Blocking”
section on page 21-6.
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 21-3.
Protected port Disabled. See the “Configuring Protected Ports” section on
page 21-5.
Port security Disabled. See the “Default Port Security Configuration” section
on page 21-10.
Port Fast Disabled. See the “Default Optional Spanning-Tree
Configuration” section on page 17-9.
Auto-MDIX Enabled.
Note The switch might not support a pre-standard powered
device—such as Cisco IP phones and access points that do
not fully support IEEE 802.3af—if that powered device is
connected to the switch through a crossover cable. This is
regardless of whether auto-MIDX is enabled on the switch
port.
Table 10-1 Default Layer 2 Ethernet Interface Configuration (continued)
Feature Default Setting