Switching

HI,
I have EX2200 switch and my necessary configure dhcp relay option. In documentation I found two commands for it, helper bootp and dhcp-relay. In documentation not indicate exactly distinction between this two comands.

Do dhcp relay  is more extended version helper boopt? Do in typicaly situation (switch as dhcp relay agent without extra requrement) use helper bootp?
Can You please explain different and existence this commands? 

Maybe this PPT answering you question

(attached)

Attachment(s)

BOOTP and DHCP.ppt   283 KB 1 version

Sorry, perhaps I not clear explained my question.

I undestand appointment protocols BOOTP and DHCP. 

In Juniper documentation have mention that protocol BOOTP (helper bootp command) can be use for purpose configure dhcp relay agent.  In fact this two commands (helper bootp and dhcp-relay) do the same.

What for use two various commands, if command helper bootp it is good doing its work?

Bootp is the original forwarding method and the dhcp helper options are a later addition to Junos with more configuration options for control. 

If your needs are simple and you don't use routing intances with dhcp, I would stick with the bootp version.

You cannot mix the two on the same box.  And bootp option does not work inside of a routing instance so you would need to use the dhcp helper version then.

Dhcp helper is also better if you are using a subscriber management system for dhcp as it can be modestly stateful on the MX and work hand in hand with such a management system.

Do I true understand that command helper bootp best use in simple instance and command dhcp-relay best use in more complicated instance?

Do You present link on documentation where it is  explained, please?

Yes, this is how I see the features working.

Simple dhcp helper using bootp

http://www.juniper.net/techpubs/en_US/junos15.1/topics/usage-guidelines/policy-configuring-routers-or-interfaces-as-dhcp-and-bootp-relay-agents.html

Overview of the extended dhcp options.  

http://www.juniper.net/documentation/en_US/junos15.1/topics/concept/dhcp-extended-dhcp-relay-overview.html

You can also download the full subscriber mgmt guide which contains this feature:

http://www.juniper.net/techpubs/en_US/junos15.1/information-products/pathway-pages/subscriber-access/subscriber-mgmt-provisioning.pdf