Configuring Address-Assignment Pools

The address-assignment pool feature supports subscriber management functionality by enabling you to create address pools that can be shared by different client applications.

Note: You cannot use address-assignment pools with the J-series DHCP server. Also, address-assignment pools are completely separate from L2TP address pools, which you create with the address-pool statement at the [edit access] hierarchy level, and NAT pools, which you create with the pool statement at the [edit services nat] hierarchy level.

To configure an address-assignment pool, include the address-assignment statement at the [edit access] hierarchy level. Include the dhcp-attributes statement to enable DHCP support and include configuration options in the address lease for the address-assignment pool.

• Configuring an Address-Assignment Pool Name and Network Address
• Configuring a Named Address Range for Dynamic Address Assignment
• Configuring Static Address Assignment
• Configuring DHCP Client-Specific Attributes

Configuring an Address-Assignment Pool Name and Network Address

To configure an address-assignment pool, include the following mandatory statements at the [edit access] hierarchy level:

The address-assignment pool definition must include the pool name and the network statement. The network statement specifies the network address and prefix length for the addresses in the pool.

The following is an example of an address-assignment pool definition:

Configuring a Named Address Range for Dynamic Address Assignment

You can optionally configure multiple named subsets of addresses within an address-assignment pool. During dynamic address assignment, a client can be assigned an address from a specific named range. To create a named range, use the range statement at the [edit access address-assignment pool pool-name family inet] hierarchy level to identify the range and configure the lower and upper address boundaries of the range:

Configuring Static Address Assignment

You can optionally create a static binding by reserving a specific address for a particular client. When you reserve an address, that address is removed from the address-assignment pool so that it is not assigned to another client. To configure a static address assignment, use the host statement at the [edit access address-assignment pool pool-name family init] hierarchy level to identify the client and create a binding between the client MAC address and the assigned IP address:

The following is an example of a static binding configuration. This configuration specifies that the client with MAC address 90:00:00:01:00:01 is always assigned IP address 192.168.44.12.

Configuring DHCP Client-Specific Attributes

Use the address-assignment pool feature to include application-specific attributes when clients obtain an address. The client application, such as DHCP, uses the attributes to determine how addresses are assigned, and to also provide optional application-specific characteristics to the client. For example, the DHCP application might specify that a client that matches certain prerequisite information is dynamically assigned an address from a particular named range. Based on which named range is used, DHCP specifies additional DHCP attributes such as the boot-file that the client uses, the lease grace period, and the maximum lease time.

Use the dhcp-attributes statement at the [edit access address-assignment pool pool-name family inet] hierarchy level to configure client-specific attributes for DHCP clients. DHCP Attributes Table describes the DHCP attributes.

Related Topics

• DHCP Attributes Table
• License Requirements for Address-Assignment Pools
• Example: Configuring an Address-Assignment Pool