8-17
Catalyst 2360 Switch Software Configuration Guide
OL-19808-01
Chapter 8 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Configuring Interface Speed and Duplex Mode
Ethernet interfaces on the switch operate at 10, 100, 1000, or 10,000 Mb/s 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-Mb/s ports operate in half-duplex mode, which means that stations can either receive or
send traffic.
Switch models include Gigabit Ethernet (10/100/1000-Mb/s) ports, 10-Gigabit Ethernet ports, and small
form-factor pluggable (SFP) module slots.
•
Speed and Duplex Configuration Guidelines, page 8-17
•
Setting the Interface Speed and Duplex Parameters, page 8-18
Speed and Duplex Configuration Guidelines
When configuring an interface speed and duplex mode, note these guidelines:
•
The 10-Gigabit Ethernet ports do not support the speed and duplex features. These ports operate
only at 10,000 Mb/s and in full-duplex mode.
•
Gigabit Ethernet (10/100-Mb/s) ports support all speed options and all duplex options (auto, half,
and full). Gigabit Ethernet ports operating at 1000 Mb/s do not support half-duplex mode.
•
For SFP module ports, the speed and duplex CLI options change depending on the SFP module type:
–
The 1000BASE-
x
(where -
x
is -BX, -CWDM, -LX, -SX, and -ZX) SFP module ports support
the
nonegotiate
keyword in the
speed
interface configuration command. Duplex options are not
supported.
–
The 1000BASE-T SFP module ports support the same speed and duplex options as the
10/100/1000-Mb/s ports.
For information about which SFP modules are supported on your switch, see the product release
notes.
•
If both ends of the line support autonegotiation, we highly recommend the default setting of
auto
negotiation.
•
If one interface supports autonegotiation and the other end does not, configure duplex and speed on
both interfaces; do not use the
auto
setting on the supported side.
•
When STP is enabled and a port is reconfigured, the switch can take up to 30 seconds to check for
loops. The port LED is amber while STP reconfigures.
Caution
Changing the interface speed and duplex mode configuration might shut down and re-enable the
interface during the reconfiguration.
Port Fast
Disabled. See the
“Default Optional Spanning-Tree
Configuration” section on page 13-9
Auto-MDIX
Enabled.
Table 8-2
Default Layer 2 Ethernet Interface Configuration (continued)
Feature
Default Setting
