Cisco 3750, 3550, or 3524 DHCP?

[TekControl]

i know its possible to configure one of these series as a DHCP server. my question/s are such:
1. is it possible to make sure that, when a device attaches to a specific port, they obtain a specific IP reguardless of a MAC (ie static reservation)?
2. would ,by making the switch a DHCP server, would this effect any other Windows DHCP servers on the same network? if so, this could be cleared up by excluding a specific range on the Win server for the cisco switch right?

reason im asking this is because we have a switch that is used for VIP's etc. when they bring their laptop they want the ability to VPN back to their network by tunneling through ours. sometimes their VPN uses certain TCP/UDP ports that are normally blocked by our firewall. we can fix this when they have a specific IP address that has designated rights established by the firewall. however we would like to not add confusion to the user by throwing a static on their NIC, only to have them remember to remove it when they leave. if the switch can throw them a specific IP dynamicaly that the firewall can adapt to, then that would make the VIP's visit much less stressful.

any help in this matter will be greately appreciated!

 

[jdeisenm]

make a vlan that has only one port, this special port, then make a DHCP range that only has one ip address
this exmple would only hand out 10.10.1.2 via DHCP

vlan 10
name guest_vlan_10

int vlan 10
description guest_vlan_10
ip address 10.10.1.1 255.255.255.252

ip dhcp pool guest_vlan_10
network 10.10.1.0 255.255.255.252
dns-server 1.1.1.1 2.2.2.2
netbios-name-server 3.3.3.3 4.4.4.4

interface fa0/1
description fa0/1 guest_vlan_10 switchport
switchport access vlan 10
spanning-tree portfast