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DHCP Question

Last Modified: 2010-03-18
I've got about 9 wings of a building that I'm wanting to Subnet out onto different V-LANS and run DHCP for all of them.  

I can Set up the V-Lans using our Cisco Routers, but I wondering what would be better to do... Allow Cisco to run DHCP for each of those subnets or to have windows handle it...  If windows... What would be the best way of seperating the DHCP broadcasts for each V-Lan??  Cause I'm not wanting the machines in the VLAN 172.15.x.x Subnet to grab an IP from the 172.16.x.x range and so on.  I'm still looking into solutions... but wanted some input.
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Yeah, James, I was thinking of having a DHCP server for each VLAN and you're right that would take care of my needs... But I'm not wanting to put one on each VLAN... That would be expensive I think...  I was wondering if maybe I could do this with a superscope on one Centrally located DHCP Server maybe.

ANd WhiteHawk... I'm starting to think Cisco might be the easiest way to go.  We have a Cisco 6513 at the heart of everything and then branch off via fiber to all the different wings.  Right now we're as flat as flat can be.  Just wanting to cut down on the extra chatter.  I'm thinking that the cisco might be better, but wanted some input before I made a decision....

If anyone sees a better way...  As Ross Perot said... "I'm all ears."
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I was looking at Chpt. 10 just before I wrote this question... I was actually hoping to avoid multiple DHCP Servers... but it's looking like that's not possible.
Cisco -vs- Microsoft!  Will the battle never end! lol.  I'm outnumbered!  :D

You can do some serious vlan management with that 6513 you have there.  Are either you or james in a public school network situation?

Just curious :)

Sounds like you will make out well with either choice Tech.  

I work for a private college.  Three campuses.  Each campus has two VLANs each, one for staff and one for students, for a total of six VLANs.  I don't think the Cisco thing is a BAD idea.  On the contrary, I like Cisco very much, but I just think there would be more flexibility with MS Servers running DHCP.  One possibility (a far reaching one perhaps) is getting a DHCP router, gateway for each segment.  They're pretty cheap (like $100), and everyone can use that as their individual VLAN gateways for each segment and that box would assign addresses.  It would be cheaper than using eight servers because you are not paying for Windows 2000 Server 8 times over.  In any event, I think managing DHCP individually from each VLAN is the best option.  I don't like single points of failure.  They make me nervous.


I work for a Large Television Ministry.  I'm actually wanting to go with Microsoft for the DHCP part.  And Cisco can do the VLANS to seperate the Subnets.  

As for the Single point of failure... I'm not wanting to run multiple DHCP servers on each Subnet, but I am planning on running 2 DHCP servers facilitating requests for the network, that way if one goes down then the other can take up the slack.  I remember learning about that when I was studying for my MCSE exams, but since i haven't used it for so long... I've forgotten some of the details.  ;)

This is my plan... Create the DHCP server with a superscope encomapssing all the subnets I'm planning to facilitate.  Then Configure My routers to facilitate the requests that come through, of course with bootp enabled, that way I don't need a DHCP relay agent.  Then Shouldn't that allow the machines on each subnet to recieve and utilize the correct DHCP range, or is there something I'm missing... I'm thinking there is....

We did this at the college I worked at, but it was all Cisco, and I wasn't involved much on the Cisco end of things at that time.
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Did this help you?  You haven't responded and the question is still open.  A lot of experts took their time to try to assist you.  Might be prudent to try to reply, close, accept the answers provided.
All of the suggestions are valid.  Possibly a split between all responding experts would be appropriate.

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