Support: L2,IP
    Default: Internal                 Value: Set of external, internal

    Routes received through routing protocols other than RIP with metric
    classes in this set are candidates for announcement in RIP messages
    subject to the route propagation policy in force. Routes with metric
    classes not in this set will not be announced.  Each value in this
    set may be overridden separately by a more specific propagation
    policy specified by a routing send route or routing send route route
    source entity. This characteristic is supported only if the routing
    protocols supported characteristic includes the RIP routing protocol.