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Chapter 10
Configuring Address Pools
Configuring ODAPs to Obtain Subnets Through IPCP Negotiation
When you assign an IP address pool to customer premise equipment (CPE), the pool manager assigns IP
Note
addresses to the CPE devices and to a DHCP pool. To use the ODAP functionality requires the following:
•
•
•
To configure an on-demand address pool with the IP Control Protocol (IPCP) as the subnet allocation
protocol, enter the following commands beginning in global configuration mode:
Command
Step 1
Router(config)# ip dhcp pool name
Step 2
Router(config-dhcp)# import all
Step 3
Router(config-dhcp)# origin ipcp
Step 4
Router(config-dhcp)# exit
Step 5
Router(config)# interface type
Step 6
Router(Config-if)# ip address pool name
Disabling ODAPs
To disable an ODAP from a DHCP pool, enter the following commands beginning in global
configuration mode:
Command
Step 1
Router(config)# ip dhcp pool name
Step 2
Router(config-if)# no origin {dhcp | aaa
| ipcp}
When you disable an ODAP, all leased subnets are released. If active PPP sessions are using addresses
Note
from the released subnets, those sessions are reset. DHCP clients leasing addresses from the released
subnets are not able to renew their leases.
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The Cisco IOS CPE device must be able to request and use the subnet.
The RADIUS server using AAA must be able to provide the subnet and insert the framed route into
the proper VRF table.
The PE router must be able to facilitate providing the subnet through IPCP.
Purpose
Configures a DHCP address pool on a Cisco IOS DHCP server
and enters DHCP pool configuration mode.
Imports option parameters into the Cisco IOS DHCP server
database.
Configures an address pool as an on-demand address pool by
using IPCP as the subnet allocation protocol.
Exits DHCP pool configuration mode.
Selects an interface and enters interface configuration mode.
Indicates to automatically configure the interface's IP address
from the specified pool.
The pool must be populated with a subnet from IPCP.
Note
Purpose
Enters DHCP pool configuration mode for the DHCP address
pool indicated.
Disables the ODAP
Cisco 10000 Series Router Software Configuration Guide
On-Demand Address Pool Manager
10-11
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Troubleshooting
