-
Cisco IOS XE IP Addressing Services Configuration Guide, Release 2
- Part 1: IP Addressing
- Part 2: ARP
-
Part 3: DHCP
-
DHCP Overview
-
Configuring the Cisco IOS XE DHCP Server
-
Configuring the DHCP Server On-Demand Address Pool Manager
-
Configuring the Cisco IOS XE DHCP Relay Agent
-
DHCP Relay Server ID Override and Link Selection Option 82 Suboptions
-
DHCP Server RADIUS Proxy
-
Configuring the Cisco IOS XE DHCP Client
-
Configuring DHCP Services for Accounting and Security
-
ISSU and SSO--DHCP High Availability Features
-
- Part 4: DNS
- Part 5: NAT
- Part 6: NHRP
Table Of Contents
Restrictions for IP Overlapping Address Pools
Information About IP Overlapping Address Pools
How to Configure IP Overlapping Address Pools
Configuring and Verifying a Local Pool Group
Configuration Examples for Configuring IP Overlapping Address Pools
Define Local Address Pooling as the Global Default Mechanism Example
Configure Multiple Ranges of IP Addresses into One Pool Example
Feature Information for Configuring IP Overlapping Address Pools
IP Overlapping Address Pools
First Published: May 2, 2005Last Updated: May 4, 2009The IP Overlapping Address Pools feature improves flexibility in assigning IP addresses dynamically. This feature allows you to configure overlapping IP address pool groups to create different address spaces and concurrently use the same IP addresses in different address spaces.
Finding Feature Information
For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Configuring IP Overlapping Address Pools" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•
Restrictions for IP Overlapping Address Pools
•
•
•
Restrictions for IP Overlapping Address Pools
The Cisco IOS XE software checks for duplicate addresses on a per-group basis. The check for duplicate addresses means that you can configure pools in multiple groups that could have possible duplicate addresses. The IP Overlapping Address Pools feature should be used only in cases where overlapping IP address pools make sense, such as Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) environments where multiple IP address spaces are supported.
Information About IP Overlapping Address Pools
To configure the IP Overlapping Address Pools feature, you should understand the following concepts:
Benefits
The IP Overlapping Address Pools gives greater flexibility in assigning IP addresses dynamically. It allows you to configure overlapping IP address pool groups to create different address spaces and concurrently use the same IP addresses in different address spaces.
How IP Address Groups Work
Existing configurations are not affected by the new pool feature. The "group" concept is an extension of the existing ip local pool command. Processing of pools that are not specified as a member of a group is unchanged from the existing implementation.
How to Configure IP Overlapping Address Pools
This section contains the following procedure:
•
Configuring and Verifying a Local Pool Group
Perform this task to configure a local pool group and verify that it exists.
SUMMARY STEPS
1.
2.
3.
4.
DETAILED STEPS
Configuration Examples for Configuring IP Overlapping Address Pools
This section provides the following configuration examples:
•
•
Define Local Address Pooling as the Global Default Mechanism Example
The following example shows how to configure local pooling as the global default mechanism:
ip address-pool localip local pool default 192.168.15.15 192.168.15.16Configure Multiple Ranges of IP Addresses into One Pool Example
The following example shows how to configure two ranges of IP addresses for one IP address pool:
ip local pool default 192.169.10.10 192.169.10.20ip local pool default 192.168.50.25 192.168.50.50Additional References
The following sections provide references related to configuring IP Overlapping Address Pools.
Related Documents
Standards
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
—
MIBs
RFCs
Technical Assistance
Feature Information for Configuring IP Overlapping Address Pools
Table 1 lists the features in this module and provides links to specific configuration information.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note
Glossary
IPCP—IP Control Protocol. Protocol that establishes and configures IP over PPP.
MPLS—Multiprotocol Label Switching. Switching method that forwards IP traffic using a label. This label instructs the routers and the switches in the network where to forward the packets based on preestablished IP routing information.
NAT—Network Address Translation. Mechanism for reducing the need for globally unique IP addresses. NAT allows an organization with addresses that are not globally unique to connect to the Internet by translating those addresses into globally routable address space. Also known as Network Address Translator.
VPDN—virtual private dialup network. Also known as virtual private dial network. A VPDN is a network that extends remote access to a private network using a shared infrastructure. VPDNs use Layer 2 tunnel technologies (L2F, L2TP, and PPTP) to extend the Layer 2 and higher parts of the network connection from a remote user across an ISP network to a private network. VPDNs are a cost-effective method of establishing a long distance, point-to-point connection between remote dial users and a private network. See also VPN.
VPN—Virtual Private Network. Enables IP traffic to travel securely over a public TCP/IP network by encrypting all traffic from one network to another. A VPN uses "tunneling" to encrypt all information at the IP level.
VRF—A VPN routing and forwarding instance. A VRF consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what goes into the forwarding table. In general, a VRF includes the routing information that defines a customer VPN site that is attached to a PE router.
CCDE, CCENT, CCSI, Cisco Eos, Cisco HealthPresence, Cisco IronPort, the Cisco logo, Cisco Nurse Connect, Cisco Pulse, Cisco SensorBase, Cisco StackPower, Cisco StadiumVision, Cisco TelePresence, Cisco Unified Computing System, Cisco WebEx, DCE, Flip Channels, Flip for Good, Flip Mino, Flipshare (Design), Flip Ultra, Flip Video, Flip Video (Design), Instant Broadband, and Welcome to the Human Network are trademarks; Changing the Way We Work, Live, Play, and Learn, Cisco Capital, Cisco Capital (Design), Cisco:Financed (Stylized), Cisco Store, Flip Gift Card, and One Million Acts of Green are service marks; and Access Registrar, Aironet, AllTouch, AsyncOS, Bringing the Meeting To You, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Lumin, Cisco Nexus, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, Continuum, EtherFast, EtherSwitch, Event Center, Explorer, Follow Me Browsing, GainMaker, iLYNX, IOS, iPhone, IronPort, the IronPort logo, Laser Link, LightStream, Linksys, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, PCNow, PIX, PowerKEY, PowerPanels, PowerTV, PowerTV (Design), PowerVu, Prisma, ProConnect, ROSA, SenderBase, SMARTnet, Spectrum Expert, StackWise, WebEx, and the WebEx logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0910R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
© 2005-2009 Cisco Systems, Inc. All rights reserved.
