Up to seven flexible algorithms in the range 128 to 255 can be configured for OSPFv2. Use the participate command to configure a router to participate in the specific algorithm. If a locally configured FAD exists, use the advertise command to advertise the definition. A router is not required to advertise a configured FAD to participate in a Flex-Algorithm. If a Flex-Algorithm is enabled to participate in or advertise the FAD, it is configured and active for all configured OSPFv2 areas.
config>router>ospf
+--flexible-algorithms
+--[no] flex-algo flex-algo-id
+--advertise fad-name
+--no advertise
+-- [no] loopfree-alternates
+-- [no] participate
+-- [no] shutdown
ospf 0
flexible-algorithms
flex-algo 128
advertise "My128"
participate
exit
no shutdown
exit