Switching

How do you configure DHCP-Relay on the new EX3400 switches (version: 15.1X53-D55.5)?  It used to be as simple as this:

set forwarding-options helpers bootp server 10.100.134.10
set forwarding-options helpers bootp interface vlan.10
set forwarding-options helpers bootp interface vlan.20

Please help.  I am trying to configure a new switch.  A configuration example based on the above would be great.

Thank you!!

EX3400 is using ELS-style config. Example below:

jh@fw# show forwarding-options
dhcp-relay {
    server-group {
        dhcp-server {
            1.2.3.4;
        }
    }
    active-server-group dhcp-server;
    group dhcp-server {
        interface irb.10;
        interface irb.20;
    }
}

jh@fw# show forwarding-options | display set
set forwarding-options dhcp-relay server-group dhcp-server 1.2.3.4
set forwarding-options dhcp-relay active-server-group dhcp-server
set forwarding-options dhcp-relay group dhcp-server interface irb.10
set forwarding-options dhcp-relay group dhcp-server interface irb.20

Thanks Jonas for the reply.  Is this the minimal required configuration for a simple DHCP Helper?  JTAC suggested this:

set forwarding-options dhcp-relay forward-snooped-clients all-interfaces

set forwarding-options dhcp-relay overrides allow-snooped-clients

set forwarding-options dhcp-relay overrides delete-binding-on-renegotiation

set forwarding-options dhcp-relay overrides layer2-unicast-replies

set forwarding-options dhcp-relay overrides trust-option-82

set forwarding-options dhcp-relay server-group DHCP-SERVER 10.12.254.16

set forwarding-options dhcp-relay group DATA active-server-group DHCP-SERVER

set forwarding-options dhcp-relay group DATA interface irb.1611

set forwarding-options dhcp-relay group DATA interface irb.1638

set forwarding-options dhcp-relay group DATA interface irb.2376

I think what JTAC suggested is over-kill for what I am trying to accomplish.

Thanks!!

Yes, this is the minimum configuration as per this tech doc: https://www.juniper.net/documentation/en_US/junos/topics/example/dhcp-subscriber-access-dhcp-relay-minimum-configuration.html

Agreed that the JTAC recommended is correct but a bit overkill in many scenarios.

Hello Natesinz,

This is a basic DHCP relay configuration on EX3400

root@jtac-QFX5100-48S-6Q-r030> show configuration forwarding-options dhcp-relay

server-group {

serv1 {

192.168.100.1;

}

}
active-server-group serv1;

group client1 {

interface irb.100;

}

root@olympic> show configuration system services

dhcp-local-server  {

group serv1 {

interface interface interface

xe-0/0/2.0;

irb.200;

lo0.0;

}

}

Thanks and regards,

Murugappan 

Juniper JTAC EX-QFX Series