Add a static route to a Cisco router

A static route adds an entry to the routing table for a specific destination IP address or subnet.

To route traffic to the 10.10.20.0/24 subnet through the IP address 192.168.100.1:

conf t
ip route 10.10.20.0 255.255.255.0 192.168.100.1

The netmask 255.255.255.0 means the same as the subnet/24 notation.

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Courtesy  http://www.tech-recipes.com/rx/76/add-a-static-route-to-a-cisco-router/