This Attribute sets the preference level of OSPF-internal routes to be
less preferred than RIP.
This Parameter should only be used when starting migration of network
from RIP to OSPF. When ready to cutover to OSPF, set this attribute
disabled and run under normal preferences. All OSPF routers in the
Autonomous System should be running with migraterip enabled or with
migraterip disabled to prevent routing loops. It is important that the
changeover period from RIP to OSPF be performed quickly on all OSPF
routers so that no routing loops are formed. These routing loops could
be caused by conflicts in the internal RIP and OSPF databases.