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Grouping Interfaces with Common DHCP Relay Configuration

Configuring a DHCP relay group enables you to apply a common DHCP relay agent configuration to a named group of interfaces. To configure a group, include the group statement at the [edit forwarding-options dhcp-relay] hierarchy level:



[edit forwarding-options dhcp-relay]

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];
}

Configuring Group-Specific DHCP Relay Options

You can include the following statements at both the [edit forwarding-options dhcp-relay group group-name] hierarchy level to set group-specific DHCP relay agent configuration options, and at the [edit forwarding-options dhcp-relay] hierarchy level to set global DHCP relay agent configuration options:

active-server-group—Configure an active server group to apply a common DHCP relay agent configuration to a named group of DHCP server addresses. For information, see Configuring Active Server Groups.
authentication—Configure the parameters the router sends to the external AAA server.
overrides—Override the default configuration settings for the extended DHCP relay agent. For information, see Overriding the Default DHCP Relay Configuration.
relay-option-60—Use the DHCP vendor class identifier option (option 60) in DHCP client packets to select a DHCP server to which to forward packets. For more information, see Using Option 60 Information to Forward Client Traffic to Specific DHCP Servers.
relay-option-82—Enable or disable the insertion of option 82 information in packets destined for a DHCP server. For information, see Enabling and Disabling Insertion of Option 82 Information.

The statements configured at the [edit forwarding-options dhcp-relay group group-name] hierarchy level apply only to the named group of interfaces, and override any global DHCP relay agent settings configured with the same statements at the [edit dhcp-relay dhcp-relay] hierarchy level.

Enabling the DHCP Relay Agent on Specified Interfaces

To specify the names of one or more interfaces within a specified group on which the DHCP relay agent is enabled, include the interface statement at the [edit forwarding-options dhcp-relay group group-name] hierarchy level:



[edit forwarding-options dhcp-relay group group-name]
interface interface-name;

You can include multiple interface interface-name statements to specify multiple interfaces within a group, but you cannot specify the same interface in more than one group.

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