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Cisco Systems, Inc. www.cisco.com
Configuring Interfaces
This chapter defines the types of interfaces and describes how to configure them.
Understanding Interface Types, page 17
Using the Switch USB Port, page 26
Using Interface Configuration Mode, page 27
Configuring Ethernet Interfaces, page 31
Configuring Layer 3 Interfaces, page 42
Configuring the System MTU, page 43
Monitoring and Maintaining the Interfaces, page 45
Understanding Interface Types
This section describes the different types of interfaces supported by the switch with references to chapters that contain
more detailed information about configuring these interface types. The rest of the chapter describes configuration
procedures for physical interface characteristics.
UNI, NNI, and ENI Port Types, page 17
Port-Based VLANs, page 18
Switch Ports, page 19
Routed Ports, page 20
Switch Ports, page 19
Switch Virtual Interfaces, page 20
EtherChannel Port Groups, page 20
Power over Ethernet Ports, page 21
Connecting Interfaces, page 25
UNI, NNI, and ENI Port Types
The switch supports user-network interfaces (UNIs), network node interfaces (NNIs), and enhanced network interfaces
(ENIs). UNIs are typically connected to a host, such as a PC or a Cisco IP phone. NNIs are typically connected to a router
or to another switch. ENIs have the same functionality as UNIs, but can be configured to support protocol control packets
for Cisco Discovery Protocol (CDP), Spanning-Tree Protocol (STP), Link Layer Discovery Protocol (LLDP), and
EtherChannel Link Aggregation Control Protocol (LACP) or Port Aggregation Protocol (PAgP).
By default, all ports are enabled as NNI.
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