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    Address-Assignment Pools Overview

    The address-assignment pool feature supports subscriber management functionality by enabling you to create IPv4 address pools that different client applications can share. For example, multiple client applications, such as Dynamic Host Configuration Protocol (DHCP), can use an address-assignment pool to provide addresses for their particular clients.

    Address-assignment pools support both dynamic and static address assignment. In dynamic address assignment, a client is automatically assigned an address from the address-assignment pool. In static address assignment, which is supported for IPv4 pools only, you reserve an address that is then always used by a particular client. Addresses that are reserved for static assignment are removed from the dynamic address pool and cannot be assigned to other clients.

    You can configure named address ranges within an address-assignment pool. A named range is a subset of the overall address range. A client application can use named ranges to manage address assignment based on client-specific criteria. For example, for IPv4 address-assignment pools, you might create a named range that is based on a specific DHCP option 82 value. Then, when a DHCP client request matches the specified option 82 value, an address from the specified range is assigned to the client.

    You can link address-assignment pools together to provide backup pools for address assignment. When the primary pool is fully allocated, the router or switch automatically switches to the linked, or secondary, pool and begins allocating addresses from that pool.

    Modified: 2017-08-31