Etherchannel Port Groups; 10-Gigabit Ethernet Interfaces; Power Over Ethernet Ports - Cisco 3750G - Catalyst Integrated Wireless LAN Controller Configuration Manual

Understanding Interface Types

EtherChannel Port Groups

EtherChannel port groups treat multiple switch ports as one switch port. These port groups act as a single
logical port for high-bandwidth connections between switches or between switches and servers. An
EtherChannel balances the traffic load across the links in the channel. If a link within the EtherChannel
fails, traffic previously carried over the failed link changes to the remaining links. You can group
multiple trunk ports into one logical trunk port, group multiple access ports into one logical access port,
group multiple tunnel ports into one logical tunnel port, or group multiple routed ports into one 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 34, "Configuring EtherChannels and Link-State Tracking."

10-Gigabit Ethernet Interfaces

The Catalyst 3750G-16TD switch has one 10-Gigabit Ethernet interface. The switch uses a 10-Gigabit
Ethernet XENPAK module to establish connections to networks.
The 10-Gigabit Ethernet interface only operates in full-duplex mode. The interface can be configured as
a switched port or a routed port. A stack of Catalyst 3750 switches can have up to nine 10-Gigabit
Ethernet interfaces. A cross-stack EtherChannel supports up to two 10-Gigabit module ports.
For the latest information about XENPAK modules supported by the switch, see the release notes.
For more information about XENPAK modules, see your XENPAK module documentation.
The 10-Gigabit Ethernet module ports are referred to as 10-Gigabit Ethernet XENPAK modules in the
Note
hardware installation guide.

Power over Ethernet Ports

Catalyst 3750 PoE-capable switch ports automatically supply power to these connected devices (if the
switch senses that there is no power on the circuit):
•
•
On a 24-port PoE switch, each 10/100 or 10/100/1000 PoE port provides up to 15.4 W of power. On a
48-port PoE switch, any 24 of the 48 10/100 or 10/100/1000 PoE ports provide 15.4 W of power, or any
combination of ports provide an average of 7.7 W of power at the same time, up to a maximum switch
power output of 370 W.
A powered device can receive redundant power when it is connected to a PoE switch port and to an AC
power source.
Catalyst 3750 Switch Software Configuration Guide
11-6
Cisco pre-standard powered devices (such as Cisco IP Phones and Cisco Aironet access points)
IEEE 802.3af-compliant powered devices
Chapter 11 Configuring Interface Characteristics
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