Cisco Cisco Packet Data Gateway (PDG) Guida Alla Risoluzione Dei Problemi
Service Configuration Procedures
▀ Configuring IP Address Pools on the System
▄ Cisco ASR 5000 Series Packet Data Serving Node Administration Guide
OL-22939-01
Configuring IP Address Pools on the System
One of the steps in establishing a PPP session between the mobile and the PDSN service running on the system is that
upon successful authentication, the subscriber's mobile node is assigned an IP address. The IP address could be
dynamically assigned from a pool that is configured on the system or on the AAA server. It may also be an address that
is statically configured in the user profile or even one that is requested by the subscriber.
upon successful authentication, the subscriber's mobile node is assigned an IP address. The IP address could be
dynamically assigned from a pool that is configured on the system or on the AAA server. It may also be an address that
is statically configured in the user profile or even one that is requested by the subscriber.
IP addresses can be dynamically assigned from a single pool/a group of IP pools/a group of IP pool groups. The
addresses/IP pools/ IP pool groups are placed into a queue in each pool or pool group. An address is assigned from the
head of the queue and, when released, returned to the end. This method is known as least recently used (LRU).
addresses/IP pools/ IP pool groups are placed into a queue in each pool or pool group. An address is assigned from the
head of the queue and, when released, returned to the end. This method is known as least recently used (LRU).
When a group of pools have the same priority, an algorithm is used to determine a probability for each pool based on the
number of available addresses, then a pool is chosen based on the probability. This method, over time, allocates
addresses evenly from the group of pools.
number of available addresses, then a pool is chosen based on the probability. This method, over time, allocates
addresses evenly from the group of pools.
Important:
Note that setting different priorities on each individual pool can cause addresses in some pools to be
used more frequently.
To configure the IP pool:
Create the IP pool for IPv4 addresses in system context by applying the example configuration.
Optional. Configure the IP pool for IPv6 addresses in system context by applying the example.
Optional. Configure the overlap-pool addresses to routing by applying the example configuration.
Verify your IP pool configuration.
Save your configuration as described in the Saving Your Configuration chapter.
Creating IPv4 Pool
Use the following example to create the IPv4 address pool:
Following are a few things to be aware of:
To ensure proper operation, IP pools should be configured within a destination context.
Each address in the pool requires approximately 24 bytes of memory. Therefore, in order to conserve available
memory, the number of pools may need to be limited depending on the number of addresses to be configured
and the number of PACs/PSCs installed.
and the number of PACs/PSCs installed.
Setting different priorities on individual pools can cause addresses in some pools to be used more frequently.