Editing bigip.conf

route-domain and dynamic routing must to be saved in bigip_base.conf.

e.g.

[root@ve11a:Active:Changes Pending] config  tmsh list net route-domain 0
net route-domain 0 {
    description "Default Route Domain"
    id 0
    routing-protocol {
        OSPFv2
    }
    vlans {
        external
        internal
    }
}
[root@ve11a:Active:Changes Pending] config  grep -A10 route-domain bigip_base.conf
net route-domain /Common/0 {
    description "Default Route Domain"
    id 0
    routing-protocol {
        OSPFv2
    }
    vlans {
        /Common/external
        /Common/internal
    }
}

if it is not there, you may experience bug 356307. it is found in 11.1.0, 11.2.0 and 11.2.1. the following is workaround by Hiroki Inoue.

workaround is to use tmsh to save or modify/disable strict routing in route-domain 0 and save, and enable strict routing and save, then dynamic routing will be saved.