Delay em notificação e check

Boa noite,
Pessoal gostaria de receber alguma dica para deixar o nagios checando instântaneo pois quando um host
cai, demora cerca de 10minutos para atualizar que o host está down e isso vem me causando problemas
pois tenho que praticamente monitorar a ferramenta de monitoramento.
Segue abaixo meu arquivo de configuração
nagios.cfg
=====================================================
cfg_file=/etc/nagios/hosts.cfg
cfg_file=/etc/nagios/services.cfg
cfg_file=/etc/nagios/misccommands.cfg
cfg_file=/etc/nagios/checkcommands.cfg
cfg_file=/etc/nagios/contactgroups.cfg
cfg_file=/etc/nagios/contacts.cfg
cfg_file=/etc/nagios/hostgroups.cfg
cfg_file=/etc/nagios/servicegroups.cfg
cfg_file=/etc/nagios/timeperiods.cfg
cfg_file=/etc/nagios/escalations.cfg
cfg_file=/etc/nagios/dependencies.cfg
cfg_file=/etc/nagios/hostextinfo.cfg
cfg_file=/etc/nagios/serviceextinfo.cfg
cfg_file=/etc/nagios/meta_commands.cfg
cfg_file=/etc/nagios/meta_contact.cfg
cfg_file=/etc/nagios/meta_contactgroup.cfg
cfg_file=/etc/nagios/meta_dependencies.cfg
cfg_file=/etc/nagios/meta_escalations.cfg
cfg_file=/etc/nagios/meta_host.cfg
cfg_file=/etc/nagios/meta_hostgroup.cfg
cfg_file=/etc/nagios/meta_services.cfg
cfg_file=/etc/nagios/meta_timeperiod.cfg
resource_file=/etc/nagios/resource.cfg
log_file=/var/log/nagios/nagios.log
temp_file=/var/log/nagios/nagios.tmp
status_file=/var/log/nagios/status.dat
aggregate_status_updates=1
status_update_interval=15
nagios_user=nagios
nagios_group=nagios
enable_notifications=1
execute_service_checks=1
accept_passive_service_checks=1
enable_event_handlers=1
log_rotation_method=d
log_archive_path=/var/log/nagios/archives/
check_external_commands=1
command_check_interval=1s
command_file=/var/log/nagios/rw/nagios.cmd
downtime_file=/var/log/nagios/downtime.log
comment_file=/var/log/nagios/comment.log
lock_file=/var/log/nagios/nagios.pid
retain_state_information=1
state_retention_file=/var/log/nagios/status.sav
retention_update_interval=180
use_retained_program_state=1
use_syslog=0
log_notifications=1
log_service_retries=1
log_host_retries=1
log_event_handlers=1
log_initial_states=1
log_external_commands=1
sleep_time=0.1
service_inter_check_delay_method=n
host_inter_check_delay_method=1
service_interleave_factor=s
max_concurrent_checks=0
max_service_check_spread=1
max_host_check_spread=2
service_reaper_frequency=2
interval_length=60
auto_reschedule_checks=1
auto_rescheduling_interval=10
auto_rescheduling_window=15
use_agressive_host_checking=1
enable_flap_detection=0
low_service_flap_threshold=25.0
high_service_flap_threshold=50.0
low_host_flap_threshold=25.0
high_host_flap_threshold=50.0
soft_state_dependencies=0
service_check_timeout=20
host_check_timeout=15
event_handler_timeout=30
notification_timeout=60
ocsp_timeout=1
perfdata_timeout=5
obsess_over_services=1
obsess_over_hosts=1
process_performance_data=1
service_perfdata_command=process-service-perfdata
service_perfdata_file=/var/log/nagios/service-perfdata
check_for_orphaned_services=1
check_service_freshness=1
service_freshness_check_interval=60
check_host_freshness=0
host_freshness_check_interval=60
date_format=us
illegal_object_name_chars=~!$%^&*"|'<>?,()=
illegal_macro_output_chars=`~$^&"|'<>
admin_email=admin
admin_pager=admin@localhost
broker_module=/usr/lib/nagios/ndomod.o config_file=/etc/nagios/ndomod.cfg
event_broker_options=-1
=========================================================

Um host para monitoramento;
define host{
 host_name   Firewall_01
 alias    Firewall 
 address    192.168.70.1
 hostgroups   DATACENTER, Firewalls
 check_command   check_host_alive
 max_check_attempts   1
 check_interval   3
 active_checks_enabled  1
 passive_checks_enabled  0
 check_period   24x7
 contact_groups   Server_Alertas_N1
 notification_interval  0
 notification_period  24x7
 notification_options  d,u,r
 notifications_enabled  1
 stalking_options   o,d,u
}


Grato por qualquer colaboração.
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