Forcing rogue wireless access points off of the network

Does anyone have any suggestions of free solutions to force rogue wireless access points off of the network?  Possibly at the router level?  We can see they are getting DHCP from our router's and even see their MAC addresses, can we setup a rule to block it?  

We use CISCO 881, 871 but this router is a cyberguard.  
LegendtechAsked:
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Rick_O_ShayConnect With a Mentor Commented:
You should be able to set up a filter to drop packets from that MAC address.
Does your DHCP server have the capability to exclude requests from that MAC?
Another option would be to DHCP assign a specific IP address for that MAC and then do an ACL or filter rule to drop that IP on inbound to the network.
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