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Configuring DHCP Services (J-Web Procedure)

Configuring DHCP Services (J-Web Procedure) on EX Series Switches

Note:

This topic applies only to the J-Web Application package.

Use the J-Web DHCP Configuration pages to configure DHCP pools for subnets and static bindings for DHCP clients on an ACX Series Universal Access Gateway router or an EX Series Ethernet Switch. If DHCP pools or static bindings are already configured, use the Configure Global DHCP Parameters Configuration page to add settings for these pools and static bindings. Settings that have been previously configured for DHCP pools or static bindings are not overridden when you use the Configure Global DHCP Parameters Configuration page.

To configure the DHCP server:

  1. Select Configure > Services > DHCP
  2. Access a DHCP Configuration page:
    • To configure a DHCP pool for a subnet, click Add in the DHCP Pools box.

    • To configure a static binding for a DHCP client, click Add in the DHCP Static Binding box.

    • To globally configure settings for existing DHCP pools and static bindings, click Configure Global DHCP Parameters.

  3. Enter information into the DHCP Service Configuration pages as described in Table 1
  4. To apply the configuration, click Apply.
    Note:

    After you make changes to the configuration on this page, you must commit the changes for them to take effect. To commit all changes to the active configuration, select Commit Options > Commit. See Using the Commit Options to Commit Configuration Changes for details about all commit options.

Table 1: DHCP Service Configuration Pages Summary

Field

Function

Your Action

DHCP Pool Information

DHCP Subnet (required)

Specifies the subnet on which DHCP is configured.

Type an IP address prefix.

Address Range (Low) (required)

Specifies the lowest address in the IP address pool range.

Type an IP address that is part of the subnet specified in DHCP Subnet field .

Address Range (High) (required)

Specifies the highest address in the IP address pool range.

Type an IP address that is part of the subnet specified in DHCP Subnet. This address must be greater than the address specified in the Address Range (Low) field.

Exclude Addresses

Specifies addresses to exclude from the IP address pool.

  • To add an excluded address, type the address next to the Add button, and click Add.

  • To delete an excluded address, select the address in the Exclude Addresses box, and click Delete.

Lease Time

Maximum Lease Time (Seconds)

Specifies the maximum length of time a client can hold a lease. (Dynamic BOOTP lease lengths can exceed this maximum time.)

Type a number from 60 through 4,294,967,295 (seconds). You can also type infinite to specify a lease that never expires.

Default Lease Time (Seconds)

Specifies the length of time a client can hold a lease for clients that do not request a specific lease length.

Type a number from 60 through 2,147,483,647 (seconds). You can also type infinite to specify a lease that never expires.

Server Information

Server Identifier

Specifies the IP address of the DHCP server reported to a client.

Type the IP address of the server. If you do not specify a server identifier, the primary address of the interface on which the DHCP exchange occurs is used.

Domain Name

Specifies the domain name that clients must use to resolve hostnames.

Type the name of the domain.

Domain Search

Specifies the order—from top to bottom—in which clients must append domain names when resolving hostnames using DNS.

  • To add a domain name, type the name next to the Add button, and click Add.

  • To delete a domain name, select the name in the Domain Search box, and click Delete.

DNS Name Servers

Defines a list of DNS servers that the client can use, in the specified order—from top to bottom.

  • To add a DNS server, type an IP address next to the Add button, and click Add.

  • To remove a DNS server, select the IP address in the DNS Name Servers box, and click Delete.

Gateway Routers

Defines a list of relay agents on the subnet, in the specified order—from top to bottom.

  • To add a relay agent, type an IP address next to the Add button, and click Add.

  • To remove a relay agent, select the IP address in the Gateway Routers box, and click Delete.

WINS Servers

Defines a list of NetBIOS name servers, in the specified order—from top to bottom.

  • To add a NetBIOS name server, type an IP address next to the Add button, and click Add.

  • To remove a NetBIOS name server, select the IP address in the WINS Servers box, and click Delete.

Boot Options

Boot File

Specifies the path and filename of the initial boot file to be used by the client.

Type a path and filename.

Boot Server

Specifies the Trivial File Transfer Protocol (TFTP) server that the client uses to obtain the client configuration file.

Type the IP address or hostname of the TFTP server.

DHCP Static Binding Information

DHCP MAC Address (required)

Specifies the MAC address of the client to be permanently assigned a static IP address.

Type the hexadecimal MAC address of the client.

Fixed IP Addresses (required)

Defines a list of IP addresses permanently assigned to the client. A static binding must have at least one fixed address assigned to it, but multiple addresses are also allowed.

  • To add an IP address, type it next to the Add button, and click Add.

  • To remove an IP address, select it in the Fixed IP Addresses box, and click Delete.

Host Name

Specifies the name of the client used in DHCP messages exchanged between the server and the client. The name must be unique to the client within the subnet on which the client resides.

Type a client hostname.

Client Identifier

Specifies the name of the client used by the DHCP server to index its database of address bindings. The name must be unique to the client within the subnet on which the client resides.

Type a client identifier in string form.

Hexadecimal Client Identifier

Specifies the name of the client, in hexadecimal form, used by the DHCP server to index its database of address bindings. The name must be unique to the client within the subnet on which the client resides.

Type a client identifier in hexadecimal form.

Configuring DHCP Services on EX4300 Switches (J-Web Procedure)

On EX4300 switches, use the DHCP Configuration page to create DHCP pools and set the DHCP parameters for them and to configure DHCP settings for existing DHCP pools and static bindings.

To configure the DHCP services on EX4300 switches:

  1. Select Configure > Services > DHCP
  2. Access a DHCP Configuration page:
    • To configure a DHCP pool for a subnet, click Add in the DHCP Pools box.

    • To configure DHCP groups, click Add in the DHCP Groups box.

    • To globally configure settings for existing DHCP pools and static bindings, click Configure Global DHCP Parameters.

  3. Enter information into the DHCP Service Configuration pages as described in Table 2
  4. To apply the configuration, click OK.
    Note:

    After you make changes to the configuration on this page, you must commit the changes for them to take effect. To commit all changes to the active configuration, select Commit Options > Commit. See Using the Commit Options to Commit Configuration Changes for details about all commit options.

Table 2: DHCP Service Configuration Pages Summary for EX4300 Switches

Field

Function

Your Action

DHCP Groups

Group Name

Specifies the name of the group.

Enter the name of the group.

Interfaces

Family inet interface is listed , only if it is already configured with family inet.

Select the interface for the specific group.

DHCP Pool Information

Pool Name

Specifies the name of an address-assignment pool.

Type the pool name.

Link Pool

Specifies the pool name to which it is linked.

Select the option from the list.

Network Address

IP Address

Specifies the IP address pool range.

Type an IP address that is part of the subnet specified in the DHCP Subnet field.

Subnet mask

Specifies the subnet specified in DHCP Subnet.

Type a subnet mask that is specified in the DHCP Subnet field.

DHCP Pool Attributes

Pool Name

Displays the name of an address-assignment pool.

The pool name is displayed.

Server Identifier

Specifies the IP address of the DHCP server reported to a client.

Type the IP address of the server. If you do not specify a server identifier, the primary address of the interface on which the DHCP exchange occurs is used.

TFTP Server

Specifies the Trivial File Transfer Protocol (TFTP) server that the client uses to obtain the client configuration file.

Enter the IP address of the TFTP server.

Maximum Lease Time (Seconds)

Specifies the maximum length of time a client can hold a lease. (Dynamic BOOTP lease lengths can exceed this maximum time.)

Type a number.

Boot File

Specifies the path and filename of the initial boot file to be used by the client.

Type a path and filename.

Boot Server

Specifies the TFTP server that provides the initial boot file to the client.

Type the IP address or hostname of the TFTP server.

Grace Period

Specifies the grace period for which a client can hold a lease.

Type the grace period in seconds.

DNS Name Servers

Defines a list of DNS servers the client can use.

  • To add a DNS server, click Add. Type an IP address in the Add IP Address pop-up window.

  • Click OK

  • To remove a DNS server, select the IP address in the DNS Name Servers box, and click Remove.

WINS Servers

Defines a list of NetBIOS name servers.

  • To add a NetBIOS name server, click Add. Type an IP address in the Add IP Address pop-up window.

  • Click OK.

  • To remove a NetBIOS name server, select the IP address in the WINS Servers box, and click Remove.

Domain Name

Specifies the domain name that clients must use to resolve hostnames.

Type the name of the domain.

NetBIOS Node Type

Specifies the NetBOIS node that provides the initial node file to the client.

Select the type from the list.

Gateway Routers

Defines a list of relay agents on the subnet, in the specified order—from top to bottom.

  • To add a relay agent, click Add. Type an IP address in the Add IP Address pop-up window.

  • Click OK.

  • To remove a relay agent, select the IP address in the Gateway Routers box, and click Remove.

Option

Specifies the DHCP options.

  • To add a DHCP option, click Add. The Add DHCP Option pop-up window is displayed. Enter the following:

  • Enter the DHCP Code in the Code box.

  • Select the DHCP type from the Type list.

  • Select the DHCP subtype from the Sub Type list.

  • Enter the DHCP value in the Value box.

  • Click OK.

  • To remove a DHCP option, select the option in the Option box, and click Remove.

Option-82

Circuit Identifier

Identifies the circuit (interface or VLAN or both) on the switch on which the request was received.

Type the circuit identifier.

Ranges

Specifies the circuit identifier range.

Type the range for the circuit identifier.

Remote Identifier

By default, the remote ID is the MAC address of the switch

Type the remote identifier.

Ranges

Specifies the remote identifier range.

Type the range for the remote identifier.

Address Range

Range Name

Specifies the name of the range.

Click Add . The Add Address Range pop-up window is displayed:

  • Type the range name in the Range Name box.

Address Range

Address Range (Low)

Specifies the lowest address in the IP address pool range.

Type an IP address that is part of the subnet specified in DHCP Subnet

Address Range (High)

Specifies the highest address in the IP address pool range.

Type an IP address that is part of the subnet specified in DHCP Subnet. This address must be greater than the address specified in Address Range (Low).

Static Bindings

Host Name

Specifies the name of the client used in DHCP messages exchanged between the server and the client. The name must be unique to the client within the subnet on which the client resides.

Type a client hostname.

MAC Address

Specifies the MAC address of the client to be permanently assigned a static IP address.

Type the hexadecimal MAC address of the client.

Fixed IP Address

Specifies the IP address of the client.

Type the IP address.

Global Settings

General

Duplicate clients on interface

Specifies the DHCP local server to include the client subinterface when distinguishing between duplicate DHCP clients (clients with the same MAC address or client ID) in the same subnet.

To enable this option, select the check box.

Pool Match Order

Specifies the order in which the DHCP local server uses information in the DHCP client PDU to determine how to obtain an address for the client.

Select the pool match order.

Authentication

Password

Specifies the password that is sent to the external AAA authentication server for subscriber authentication.

Type the password.

Username-include

Circuit Type

Specifies the circuit type that is linked with the username.

To enable this option, select the check box.

Interface Name

Name of the interface.

To enable this option, select the check box.

Mac Address

Specifies the MAC address of the client PDU that is linked with the username during the subscriber authentication process.

To enable this option, select the check box.

Logical System Name

Specifies that the logical system name that is linked with the username during the subscriber authentication process.

To enable this option, select the check box.

Option-60

Specifies the payload of Option 60 (Vendor Class Identifier) from the client PDU be linked with the username during the subscriber authentication process.

To enable this option, select the check box.

Routing Instance Name

Specifies the routing instance name that is linked with the username during the subscriber authentication process.

To enable this option, select the check box.

Option-82

Circuit Identifier

Specifies the name of the client used by the DHCP server to index its database of address bindings. The name must be unique to the client within the subnet on which the client resides.

To enable this option, select the check box.

Remote Identifier

Specifies the remote ID option in the client.

To enable this option, select the check box.

Domain Name

Specifies the domain name that clients must use to resolve hostnames.

Type the domain name.

User Prefix

Specifies the prefix to the username as defined by the user.

Type the prefix.

Delimiter

Specifies a character that separates components that make up the username.

Type the delimiter.