Configuring a DHCP Client on ACX Series

Minimum DHCP Client Configuration

The following sample output shows the minimum configuration you must use to configure an ACX Series router as a DHCP client. In this output, the interface is ge-0/0/0 and the logical unit is 0.

Configuring Optional DHCP Client Attributes

For an ACX Series router to operate as a DHCP client, you configure a logical interface on the router to obtain an IP address from the DHCP local server in the network. You can then set the client-identifier, lease time, retransmission attempts, retransmission interval, preferred DHCP local server address, vendor class ID, and update server.

1. Configure the DHCP client identifier as the routing instance name.

   • DHCP client identifier as a user ID.

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     [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

     user@host# set client-identifier user-id {ascii ascii | hexadecimal hexadecimal}

   • DHCP client identifier as the description of an interface.

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     [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

     user@host# set client-identifier use-interface-description {logical | device}

   • DHCP client identifier as a prefix:

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     [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

     user@host# set client-identifier prefix [host-name logical-system-name routing-instance-name]
2. Configure the DHCP client identifier prefix as the routing instance name.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set client-identifier prefix [host-name logical-system-name routing-instance-name]
3. Set the DHCP lease time.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set lease-time 86400
4. Set the number of attempts allowed to retransmit a DHCP packet.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set retransmission-attempts 6
5. Set the interval (in seconds) allowed between retransmission attempts. The range is 4 through 64. The default is 4 seconds.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set retransmission-interval 5
6. Set the IPv4 address of the preferred DHCP local server.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set server 10.1.1.1
7. Set the vendor class ID for the DHCP client.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set vendor-id ether
8. Propagate DHCP options received from an external DHCP server to a local DHCP server. By default, this option is not turned on.
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   [edit interfaces ge-0/0/1 unit 0 family inet dhcp-client]

   user@host# set update-server

Verifying and Managing DHCP Client Configuration

You can view or clear information about client address bindings and statistics for the DHCP client.

• To display the address bindings in the client table on the DHCP client:

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  user@host> show dhcp client binding

• To display DHCP client statistics:

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  user@host> show dhcp client statistics

• To clear the binding state of a DHCP client from the client table on the DHCP client:

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  user@host> clear dhcp client binding

• To clear all DHCP client statistics:

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  user@host> clear dhcp client statistics

• To renew a DHCP client lease time:

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  user@host> request dhcp client renew interface-name