DHCP scope cleanup plan

Where i work has a large number of DHCP scopes. must be approx 40-50 its been left that way for a good few years apparently

I have just joined in past 6 months and just getting round to look at it now

Any DHCP scope clean up plans? Whats the worst thing that can happen if some are removed that have VLAN connections (one thing we're worried about) so i plan on taking an inventory first

I know i can use powershell to look for free addresses per scope can i use this to see addresses that are taken, then i could compare using HP IMC to see whats actually being used

Any ideas appreciated domain functionality is 2008
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Indie101Asked:
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masnrockCommented:
Systems that are already connected would be fine until they try to renew their leases, depending on the type of change you make. As long as there are available DHCP addresses you should most likely be fine.

Have you worked on mapping things out yet to see how the VLANs are laid out? That may make the DHCP scopes far easier to understand.
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Indie101Author Commented:
Thanks masnrock.......

Whats the best way to start mapping this to see how VLANs are laid out?
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masnrockCommented:
See if there is a pattern to which ports are members of a given VLAN. Some places organize by department, some by section of an office, others by type of device. It obviously would be most ideal if there is documentation, but from your post it sounds like there isn't.
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Indie101Author Commented:
Thanks there isn't documentation, some of it maps up for instance there are designated scopes for different buildings, wifi etc a lot of it from what i can see isn't documented

I really want to document everything beforehand, they dont use static IP here just reserved DHCP addresses so its something I'm not that used to
I really want a plan to do this scratch with steps if possible, what would you do here,
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masnrockCommented:
Do you at least have information on the major network devices? Like switches and routers? If so, then you can use that knowledge along with network mapping software (like Spiceworks or PRTG Network Monitor). At least you will be able to verify a lot of details. Configurations of switches and routers should also help a lot. Naturally this is not a short endeavor.
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Indie101Author Commented:
Thanks yes I have switch details i might look into a trial period of network mapping software for a few months

We have approx 50 switches
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