Configuring Layer 3 Interfaces - Cisco Catalyst 4500 series Administration Manual

Configuring Layer 3 Interfaces

This chapter describes the Layer 3 interfaces on a Catalyst 4500 series switch. It also provides
guidelines, procedures, and configuration examples.
This chapter includes the following major sections:
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For complete syntax and usage information for the switch commands used in this chapter, see the Cisco
Note
Catalyst 4500 Series Switch Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/hw/switches/ps4324/index.html
If a command is not in the Catalyst 4500 Series Switch Command Reference, you can locate it in the
Cisco IOS library. See the Cisco IOS Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/ps6350/index.html
About Layer 3 Interfaces
The Catalyst 4500 family switch supports Layer 3 interfaces with the Cisco IOS IP and IP routing
protocols. Layer 3, the network layer, is primarily responsible for the routing of data in packets across
logical internetwork paths.
Layer 2, the data link layer, contains the protocols that control the physical layer (Layer 1) and how data
is framed before being transmitted on the medium. The Layer 2 function of filtering and forwarding data
in frames between two segments on a LAN is known as bridging.
The Catalyst 4500 series switch supports two types of Layer 3 interfaces. The logical Layer 3 VLAN
interfaces integrate the functions of routing and bridging. The physical Layer 3 interfaces allow the
Catalyst 4500 series switch to be configured like a traditional router.
OL_28731-01
About Layer 3 Interfaces, page 34-1
Configuration Guidelines, page 34-5
Configuring Logical Layer 3 VLAN Interfaces, page 34-6
Configuring VLANs as Layer 3 Interfaces, page 34-7
Configuring Physical Layer 3 Interfaces, page 34-12
Configuring EIGRP Stub Routing, page 34-13
C H A P T E R
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
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34-1