Local Address Pool Ranges; Local Address Pool Aliases; Shared Local Address Pools; Figure 1: Local Address Pool Hierarchy - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

Local Address Pool Ranges

Local Address Pool Aliases

Shared Local Address Pools

Copyright © 2010, Juniper Networks, Inc.

Figure 1: Local Address Pool Hierarchy

As shown in Figure 1 on page 53, each local address pool is named and contains ranges
of sequentially ordered IP addresses. These addresses are allocated when the AAA server
makes a request for an IP address.
If a local address pool range is exhausted, the next range of addresses is used. If all pool
ranges are exhausted, you can configure a new range to extend or supplement the existing
range of addresses, or you can create a new pool. The newly created pool range is then
used for future address allocation. If addresses allocated from the first pool range are
released, then subsequent requests for addresses are taken from the first pool range.
Addresses are assigned sequentially from a range within a pool. If a range has no
addresses available, the next range within that pool is used. If a pool has no addresses
available, the next configured pool is used, unless a specific pool is indicated.
An alias is an alternate name for an existing local address pool. It comprises an alias
name and a pool name.
When the AAA server requests an IP address from a specific local address pool, the local
address server first verifies whether an alias exists for the requested pool. If an alias exists,
the IP address is allocated from the pool specified by the alias. If no alias exists, the IP
address is allocated from the pool originally specified in the request.
The use of aliases simplifies management of subscribers. For example, you can use an
alias to migrate subscribers from one local address pool to another. Instead of having to
modify countless subscriber records on the AAA server, you create an alias to make the
configuration change.
Typically, the local address server allocates IP addresses from a pool of addresses that
is stored locally on the router. However, shared local address pools enable a local address
server to hand out addresses that are allocated from DHCP local server address pools
within the same virtual router. The addresses are configured and managed within DHCP.
Therefore, thresholds are not configured on the shared pool, but are instead managed
by the referenced DHCP local server pool.
Chapter 1: Configuring Remote Access
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