how to enable MRTG in nagios

i have configured nagios,  i want to view mrtg graph for bandwidth utilization, but  bandwidth graph is not showing. here is the config which i have done and

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# SWITCH.CFG - SAMPLE CONFIG FILE FOR MONITORING A SWITCH
#
# Last Modified: 10-03-2007
#
# NOTES: This config file assumes that you are using the sample configuration
#        files that get installed with the Nagios quickstart guide.
#
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#
# HOST DEFINITIONS
#
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# Define the switch that we'll be monitoring

define host{
        use             generic-switch          ; Inherit default values from a template
        host_name       54-NSEZ-VERIZON-MPLS            ; The name we're giving to this switch
        alias           54-NSEZ-verizon-mpls    ; A longer name associated with the switch
        address         1.1.1.1          ; IP address of the switch
        hostgroups      switches                ; Host groups this switch is associated with
        }




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#
# HOST GROUP DEFINITIONS
#
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# Create a new hostgroup for switches
#define hostgroup{
#       hostgroup_name  switches                ; The name of the hostgroup
#       alias           Network Switches        ; Long name of the group
#       }




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#
# SERVICE DEFINITIONS
#
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# Create a service to PING to switch

define service{
        use                     generic-service ; Inherit values from a template
        host_name               54-NSEZ-VERIZON-MPLS    ; The name of the host the service is associated with
        service_description     PING            ; The service description
        check_command           check_ping!200.0,20%!600.0,60%  ; The command used to monitor the service
        normal_check_interval   5               ; Check the service every 5 minutes under normal conditions
        retry_check_interval    1               ; Re-check the service every minute until its final/hard state is determined
        }


# Monitor uptime via SNMP

define service{
        use                     generic-service ; Inherit values from a template
        host_name               54-NSEZ-VERIZON-MPLS
        service_description     Uptime
        check_command           check_snmp!-C public -o sysUpTime.0
        }



# Monitor Port 1 status via SNMP
define service{
        use                     generic-service ; Inherit values from a template
        host_name               54-NSEZ-VERIZON-MPLS
        service_description     Port 1 Link Status
        check_command           check_snmp!-C public -o ifOperStatus.1 -r 1 -m RFC1213-MIB
        }



# Monitor bandwidth via MRTG logs

define service{
        use                     generic-service ; Inherit values from a template
        host_name               54-NSEZ-VERIZON-MPLS
        service_description     Port 1 Bandwidth Usage
        check_command           check_local_mrtgtraf!/var/lib/mrtg/1.1.1.1_1.log!AVG!1000000,1000000!5000000,5000000!10
        }

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mrtg.JPG