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FREDARCE

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DHCP design

I need to build a new  DHCP environment to handle about 350 users.
I want to divide the users into seperate vlans and create multiple scopes in my DHCP server accordingly.  I want to ensure DHCP redundancy in case of the primary server failing.  I am going to be setting up two windows 2008 servers and would like to utilize the spit scope feature. My question is what would be the optimal number of users I should have in each vlan and how should the split scope be setup.  I hear a lot of recommendations for the 80/20 split but I don't understand how that would work.

thanks
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Burns2007

The 80 20 works like this:
If you have 100 address usable in a vlan:
Configure DHCP on 1 server to serve 80 addresses. Configure DHCP on the other to serve 20 address.
So one server has 80% of the addresses, and if it fails, you use the other 20% on the other server.


For specific setup details for this scenario see: http://technet.microsoft.com/en-us/library/ee405264%28WS.10%29.aspx

Just replace their subnet with yours as appropriate.
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araberuni
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In addition to my previous post, 350 clients are not much. I reckon, a single vlan is ok for you.
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It was recommended to me to not have more than 150 to 200 hosts in a vlan so I will most likely split up the 350 user among 3 vlans.  But I still don't quite grasp the concept of the 80/20 split.  If the primary DHCP server is serving 80 percent of the IP's and goes down then only 20 percent of the hosts will be able to obtain or renew IP's for that particular vlan.  How does that provide redundancy?
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Thanks for all your feedback.  I am now deciding between using  50/50 split or DHCP cluster.