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Configuring the Extended DHCP Relay Agent

You can configure extended DHCP relay options on the router and enable the router to function as a DHCP relay agent. A DHCP relay agent forwards DHCP request and reply packets between a DHCP client and a DHCP server. You can use DHCP relay in carrier edge applications such as video/IPTV to obtain configuration parameters, including an IP address, for your subscribers.

To configure the extended DHCP relay agent on the router, include the dhcp-relay statement:




dhcp-relay {



traceoptions {
flag all;
flag auth;
flag database;
flag state;
flag interface;
flag rtsock;
flag packet;
flag packet-option;
flag io;
flag ha;
flag ui;
flag general;
flag fwd;
flag rpd;
flag session-db;


file file-name {
<files number>;
<size maximum-file-size>;
<match regex>;
<(world-readable | no-world-readable)>;
}


}





overrides {

always-write-giaddr;

always-write-option-82;

layer2-unicast-replies;

trust-option-82;

disable-relay;
}





relay-option-60 {



vendor-option {


(equals | starts-with) (ascii match-string | hexadecimal match-hex) {
(relay-server-group server-group-name | local-server-group local-server-group-name | drop);
}


(default-relay-server-group server-group-name | default-local-server-group local-server-group-name | drop);
}


}





relay-option-82 {



circuit-id {

prefix host-name logical-system-name
routing-instance-name;
}


}





server-group {



server-group-name {

server-ip-address;
}


}





active-server-group server-group-name;





authentication {

password password-string;



username-include {

circuit-type;

delimiter delimiter-character;

domain-name domain-name-string;

logical-system-name;

mac-address;

option-60;

option-82  [circuit-id]
[remote-id];

routing-instance-name;

user-prefix user-prefix-string;
}


}





group group-name {



active-server-group server-group-name;





authentication {

password password-string;



username-include {

circuit-type;

delimiter delimiter-character;

domain-name domain-name-string;

logical-system-name;

mac-address;

option-60;

option-82  [circuit-id]
[remote-id];

routing-instance-name;

user-prefix user-prefix-string;
}


}





overrides {

always-write-giaddr;

always-write-option-82;

layer2-unicast-replies;

trust-option-82;

disable-relay;
}





relay-option-60 {



vendor-option {


(equals | starts-with) (ascii match-string | hexadecimal match-hex) {
(relay-server-group server-group-name | local-server-group local-server-group-name | drop);
}


(default-relay-server-group server-group-name | default-local-server-group local-server-group-name | drop);
}


}





relay-option-82 {



circuit-id {

prefix host-name logical-system-name
routing-instance-name;
}


}




[interface [upto upto-interface-name] [exclude];


}


}

You can include these statements at the following hierarchy levels:

[edit forwarding-options]
[edit logical-systems logical-system-name forwarding-options]
[edit logical-systems logical-system-name routing-instances routing-instance-name forwarding-options]
[edit routing-instances routing-instance-name forwarding-options]
[edit routing-instances routing-instance-name bridge-domains bridge-domain-name]

For more information about how to use the DHCP relay agent in a video/IPTV application, see the JUNOS Multiplay Solutions Guide.

Note: The extended DHCP relay agent options configured with the dhcp-relay statement are incompatible with the DHCP/BOOTP relay agent options configured with the bootp statement. As a result, you cannot enable both the extended DHCP relay agent and the DHCP/BOOTP relay agent on the router at the same time.

For information about the DHCP/BOOTP relay agent, see Configuring the Router or Interface to Act as a DHCP/BOOTP Relay Agent.

The following sections describe the operation and configuration of the extended DHCP relay agent and provide simple and complex configuration examples:

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