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Posts: 15
Registered: ‎09-23-2008
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DHCP adress on one port only?!



Wondering if anyone can help me, if at all possible?!


Wondering if it is possible to have a DHCP server hand out only one ip adress to a spesific port on an EX switch?


I want eg. port 48 to give out the adress no matter which machine/equipment is connected to it.

All other ports will give out in the range as normal.


To make this even more complicated I want to run the DHCP server on one of my Microsoft servers.


So in essence, lock one port to give out one spesific adress thru DHCP.





Recognized Expert
Posts: 287
Registered: ‎04-04-2011
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Re: DHCP adress on one port only?!

The DHCP server on the Microsoft box would not be an issue, but I do not know of any way to break up a DHCP scope by the port the traffic was received on.



Distinguished Expert
Posts: 829
Registered: ‎04-17-2008
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Re: DHCP adress on one port only?!

Hi Tommy,


You may be able to do this - make sure the RVI for that VLAN is on the same switch and the DHCP server is in a different subnet.  Then look into forwarding-options helpers bootp dhcp-option82.  This appends the incoming interface to a DHCP request, so the server can identify port.  It's been a while since I've used MS DHCP, but you may be able to allocate an address based on the contents of the Option 82 field.


Hope this helps - post back here if you get it working

Ben Dale
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Follow me @labelswitcher
Posts: 196
Registered: ‎09-21-2010
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Re: DHCP adress on one port only?!

That seems like a really convoluted way of creating a guest / maint port....


I like the idea of a diff vlan myself