Fence node in apache traffic server

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http://serverfault.com – I'm currently looking into Apache Traffic Server as a tool for providing better availability of web services. But looking at the manual I can't see any reference to how I can pro-actively fence a node in the cluster. While the other nodes will take over the virtual IP if I shut down an instance, according to the manual the failover takes approx 30 seconds to detect and respond. Is there a way to remove a node from the cluster gracefully? (HowTos)