[j-nsp] EX9200 DHCP Relay

Tim Jackson jackson.tim at gmail.com
Tue Sep 16 11:04:06 EDT 2014

Basically everything is moving to jdhcpd.. It's only really licensed
on MX iirc (shouldn't be on 9200?)

set forwarding-options dhcp-relay overrides allow-snooped-clients
set forwarding-options dhcp-relay overrides always-write-giaddr
set forwarding-options dhcp-relay overrides trust-option-82
set forwarding-options dhcp-relay overrides send-release-on-delete
set forwarding-options dhcp-relay server-group DHCP-1
set forwarding-options dhcp-relay group DYNAMIC active-server-group DHCP-1
set forwarding-options dhcp-relay group DYNAMIC interface ae1.101

For most networks, you probably don't need those overrides, but if you
have something else downstream doing DHCP snooping and option 82
insertion, you have to tell it to trust it..

On Tue, Sep 16, 2014 at 7:02 AM,  <chris at sdnessentials.com> wrote:
> Juniper Geniuses,
> I'm trying to set up some basic DHCP relay on an EX9200. The CLI rejects the "forwarding-options bootp" syntax, saying "unsupported platform".
> Googling for some documentation, I came across "DHCP Relay Minimum Configuration":
> http://www.juniper.net/techpubs/en_US/junos13.3/topics/example/dhcp-subscriber-access-dhcp-relay-minimum-configuration.html
> Now, while I've come to understand that this DHCP Relay configuration was specifically meant to be for MX subscriber management, this particular page happens to be under the EX9200 documentation (I also realize the EX9200 is basically an MX). I've also read that it's kind of buggy (or was in 2012...). I also tried labbing this using some Fireflies and a VMX in Junosphere but couldn't get it working.
> Anybody out there know if this is the correct way to do DHCP relaying on an EX9200? If not, could somebody please provide a config example of how to do this?
> Regards,
> Chris
> Chris Jones, JNCIE-ENT #272 / JNCIP-SP
> SDN Engineer
> www.sdnessentials.com
> Cell: 858-888-0373
> E-Mail: chris at sdnessentials.com
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