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Detect runaway DHCP clients

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I'm wondering how I would set up an alert to catch the occasional rogue client that absolutely hammers a DHCP server with repeat requests. Almost exclusively Cisco phones, once in a while, I'll get a device that issues a few thousand DHCP requests a minute in perpetuity and fills syslog files faster than logrotation can handle as scheduled, causing filesystem full alerts. I would love to get an email if such a client shows up on the network so I could tell the VOIP folks to kill the phone's switchport and possibly based on mac address, send the alert directly to their team.

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