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
} [subn
et 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.
