Cisco Catalyst 4500 Series Administration Guide

CHAPTER
17-1
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
17
Configuring IP Unnumbered Interface
This chapter discusses the IP Unnumbered Interface feature, which allows you to enable IP processing
on an interface without assigning an explicit IP address.
This chapter contains these sections:
• About IP Unnumbered Interface Support, page 17-1
• IP Unnumbered Configuration Guidelines and Restrictions, page 17-3
• Configuring IP Unnumbered Interface Support with DHCP Server, page 17-4
• Configuring IP Unnumbered Interface Support with Connected Host Polling, page 17-6
• Displaying IP Unnumbered Interface Settings, page 17-7
• Troubleshooting IP Unnumbered Interface, page 17-8
• Related Documents, page 17-8
Note For complete syntax and usage information for the switch commands used in this chapter, see the Cisco
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 IP Unnumbered Interface Support
Before you configure VLANs and LAN interfaces with IP unnumbered interfaces, you should
understand the following concepts:
• IP Unnumbered Interface Support with DHCP Server and Relay Agent, page 17-2
• DHCP Option 82, page 17-2
• IP Unnumbered Interface with Connected Host Polling, page 17-3

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E