about options classless-static-routers of ISC dhcp

[qiaoyong]

I configured DHCP server on Redhat Enterprise Server 4 using the version of 3.0.1-12.
 
In RFC 3442,The Option of Classless Static Route can define a static router for a subnet.such as:
 
http://www.ietf.org/rfc/rfc3442.txt
 
How can I configure DHCP Server to add some classless static route to client and how to  describe it in dhcpd.conf?
 
such as :
 
destination                   gateway
10.1.0.0                       10.3.0.253
 
thanks.