Cisco Catalyst 4500 Series Software Configuration Guide

18-4
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 18 Configuring IP Unnumbered Interface
Configuring IP Unnumbered Interface Support with DHCP Server
• The option to add dhcp host routes as connected routes is available in Cisco IOS. When using
connected mode, however, the clear ip route * command deletes the dhcp host connected routes
permanently.
Workarounds:
– For a layer 3 interface (SVI), enter shut then no shut.
– To enable IP unnumbered to use static routes, enter the ip dhcp route static command.
• IP Redirect is not sent by an interface configured with IP Unnumbered Interface.
• IP Unnumbered Interface is unable to forward multicast source packets.
Configuring IP Unnumbered Interface Support with DHCP Server
Note DHCP must be configured and operational before you perform this task.
This section contains the following procedures:
• Configuring IP Unnumbered Interface Support on LAN and VLAN Interfaces, page 18-4
• Configuring IP Unnumbered Interface Support on a Range of Ethernet VLANs, page 18-5
Configuring IP Unnumbered Interface Support on LAN and VLAN Interfaces
To configure IP unnumbered interface support on a single LAN or VLAN interface, perform this task.
Command Purpose
Step 1
Switch# enable
Enables privileged EXEC mode.
Enter your password if prompted.
Step 2
Switch# configure terminal
Enters global configuration mode.
Step 3
Switch(config)# interface [fastethernet |
gigabitethernet | tengigabitethernet | vlan
vlan | port-channel | loopback]
Enters interface configuration mode and the interface to be
configured as a tunnel port.
Step 4
Switch(config-if)# ip unnumbered type number
Enables IP processing on an interface without assigning an
explicit IP address to the interface.
The type and number arguments specify another interface
on which the switch has an assigned IP address. The
interface specified cannot be another unnumbered interface.
Step 5
Switch(config-if)# exit
Returns to global configuration mode.
Step 6
Switch(config)# end
Returns to privileged EXEC mode.
Step 7
Switch# show running-config
Verifies that IP unnumbered support has been configured
correctly.

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