Cisco 10000 - Manual (Page 281)

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