Configuring Ip Unnumbered Interface Support With Dhcp Server - Cisco Catalyst 4500 Series Software Configuration Manual

Configuring IP Unnumbered Interface Support with DHCP Server

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Configuring IP Unnumbered Interface Support with DHCP Server
DHCP must be configured and operational before you perform this task.
Note
This section contains the following procedures:
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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
Step 1
Switch# enable
Step 2
Switch# configure terminal
Step 3
Switch(config)# interface [fastethernet |
gigabitethernet | tengigabitethernet | vlan
vlan | port-channel | loopback]
Step 4
Switch(config-if)# ip unnumbered type number
Step 5
Switch(config-if)# exit
Step 6
Switch(config)# end
Step 7
Switch# show running-config
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
18-4
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 on LAN and VLAN Interfaces, page 18-4
Configuring IP Unnumbered Interface Support on a Range of Ethernet VLANs, page 18-5
Chapter 18
Purpose
Enables privileged EXEC mode.
Enter your password if prompted.
Enters global configuration mode.
Enters interface configuration mode and the interface to be
configured as a tunnel port.
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.
Returns to global configuration mode.
Returns to privileged EXEC mode.
Verifies that IP unnumbered support has been configured
correctly.
Configuring IP Unnumbered Interface