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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring Interface Characteristics
Interface Types
logical routed port. Most protocols operate over either single ports or aggregated switch ports and do not
recognize the physical ports within the port group. Exceptions are the DTP, the Cisco Discovery Protocol
(CDP), and the Port Aggregation Protocol (PAgP), which operate only on physical ports.
When you configure an EtherChannel, you create a port-channel logical interface and assign an interface
to the EtherChannel. For Layer 3 interfaces, you manually create the logical interface by using the
interface port-channel global configuration command. Then you manually assign an interface to the
EtherChannel by using the channel-group interface configuration command. For Layer 2 interfaces, use
the channel-group interface configuration command to dynamically create the port-channel logical
interface. This command binds the physical and logical ports together. For more information, see
Chapter 1, “Configuring EtherChannels and Link-State Tracking.”
10-Gigabit Ethernet Interfaces
The Catalyst 3750-X and 3560-X switches have a network module slot into which you can insert a
10-Gigabit Ethernet network module, a 1-Gigabit Ethernet network module, or a blank module.
A 10-Gigabit Ethernet interface operates only in full-duplex mode. The interface can be configured as a
switched or routed port.
For more information about the Cisco TwinGig Converter Module, see the switch hardware installation
guide and your transceiver module documentation.
Power over Ethernet Ports
A PoE-capable switch port automatically supplies power to one of these connected devices if the switch
senses that there is no power on the circuit:
• Cisco pre-standard powered device (such as a Cisco IP Phone or a Cisco Aironet Access Point)
• IEEE 802.3af-compliant powered device
• IEEE 802.3at-compliant powered device
A powered device can receive redundant power when it is connected to a PoE switch port and to an AC
power source. The device does not receive redundant power when it is only connected to the PoE port.
After the switch detects a powered device, the switch determines the device power requirements and then
grants or denies power to the device. The switch can also sense the real-time power consumption of the
device by monitoring and policing the power usage.
This section has this PoE information:
• Supported Protocols and Standards, page 1-8
• Powered-Device Detection and Initial Power Allocation, page 1-8
• Power Management Modes, page 1-10
• Power Monitoring and Power Policing, page 1-11
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