Cisco 10000-2P2-2DC - Defining DHCP Odaps as the Global Default Pooling Mechanism; Configuring the DHCP Pool as an ODAP

10-7
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 10 Configuring Address Pools
On-Demand Address Pool Manager
Defining DHCP ODAPs as the Global Default Pooling Mechanism
To specify on-demand address pooling as the global default mechanism, enter the following command
in global configuration mode:
Note The DHCP server needs to be able to distinguish between a normal DHCP address request and an address
request for a PPP client. For more information, see the
“Address Allocation for PPP Sessions” section
on page 10-5.
Example 10-1 enables on-demand address pooling as the mechanism to service address requests from
PPP clients. The locally configured VRF-associated DHCP pool named Green_pool provides the
IP
addresses.
Example 10-1 Defining DHCP ODAPs as the Global Default Pooling Mechanism
!
ip address-pool dhcp-pool
!
ip dhcp pool Green_pool
!
Configuring the DHCP Pool as an ODAP
To configure a DHCP pool as an on-demand address pool, enter the following commands beginning in
global configuration mode:
Example 10-2 configures two on-demand DHCP address pools: green_pool and red_pool. The
green_pool address pool is associated with the Green VRF and the red_pool address pool is associated
with the Red VRF. Both pools obtain their subnet addresses from an external DHCP server.
Command Purpose
Router(config)# ip address-pool dhcp-pool
Enables on-demand address pooling as the global default IP
address mechanism for PPP remote access sessions into MPLS
VPNs. Locally configured VRF-associated DHCP pools allocate
IP addresses.
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)# vrf name
Associates the address pool with a VRF.
Step 3
Router(config-dhcp)# origin {dhcp | aaa |
ipcp} [subnet size initial size [autogrow
size]]
Configures an address pool as an on-demand address pool.
Step 4
Router(config-dhcp)# utilizationmark low
percentage-number
Sets the low utilization mark of the pool size. The default value is
zero percent.
Step 5
Router(config-dhcp)# utilization mark
high percentage-number
Sets the high utilization mark of the pool size. The default value
is 100 percent.