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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. Table 39 describes the DHCP attributes.




dhcp-attributes {



option-match {



option-82 {

circuit-id value range named-range;

remote-id value range named-range;
}


}



boot-file filename;

boot-server (address | hostname);

domain-name domain-name;

grace-period seconds;

maximum-lease-time seconds;

name-server [ server-names ];

netbios-node-type node-type;



option {
[ (id-number option-type option-value)
(id-number array option-type option-value) ];
}



router [ router-names ];

tftp-server address;

wins-server [ server-names ];
}

Table 39: DHCP-Attributes Statements

Statement	Description	Corresponding DHCP Option
boot-file	Boot filename advertised to the client, and used by the client to complete configuration.	67
boot-server	Boot server containing the boot file.	66
domain-name	Domain in which clients search for a DHCP server host.	15
grace-period	Grace period offered with the lease.	none
option-match	Maps option 82 value to named address range.	none
maximum-lease-time	Maximum lease time allowed by the DHCP server.	51
name-server	IP address of domain name server.	6
netbios-node-type	NetBIOS node type.	46
option	User-defined options.	–
router	IP address for routers on the subnetwork.	3
tftp-server	Trivial File Transfer Protocol (TFTP) server that the client uses to obtain the client configuration file.	150
wins-server	IP address of the Windows NetBIOS name server.	44

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