why add router to Bandwidth Monitor , but a Se0/0/0 is not any data ?

why add router to Bandwidth Monitor , but a Se0/0/0 is not any data ?

i has add router to Bandwidth Monitor , but a Se0/0/0 is not any data ? why ? thank you
i use Cisco c1841 Router and show configuration 

interface FastEthernet0/0
 ip address 172.20.19.49 255.255.255.0
 duplex auto
 speed auto
 no cdp enable
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0/0
 ip unnumbered FastEthernet0/0
 ip access-group 101 in
 fair-queue
 no cdp enable
!
interface Serial0/0/1
 no ip address
 shutdown
 clock rate 2000000
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 Serial0/0/0
ip route 172.18.200.0 255.255.255.0 172.20.19.50
ip route 202.175.19.48 255.255.255.248 172.20.19.50
ip route 202.175.19.56 255.255.255.248 172.20.19.50
ip route 202.175.51.48 255.255.255.248 172.20.19.50
!
!
no ip http server
no ip http secure-server
!
logging trap warnings
logging 172.18.200.42
access-list 1 permit 202.175.19.50
access-list 1 permit 172.18.200.9
access-list 1 permit 172.18.200.0 0.0.0.255
access-list 2 permit 202.175.19.50
access-list 2 permit 202.175.19.48 0.0.0.7
access-list 2 permit 202.175.19.56 0.0.0.7
access-list 101 remark Ban SNMP from outside
access-list 101 deny   udp any any eq snmp
access-list 101 deny   udp any any eq snmptrap
access-list 101 deny   tcp any any eq 162
access-list 101 permit ip any any
snmp-server community ic_mrtg@2006 RO
snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart
snmp-server enable traps isdn call-information
snmp-server enable traps isdn layer2
snmp-server enable traps config
snmp-server enable traps entity
snmp-server enable traps frame-relay
snmp-server enable traps frame-relay subif
snmp-server enable traps hsrp
snmp-server enable traps rtr
snmp-server enable traps syslog
snmp-server host 172.18.200.150 version 2c ic_mrtg@2006
snmp-server host 172.18.200.42 ic_mrtg@2006
no cdp runline vty 0 4
 access-class 1 in
 logging synchronous
 login local
!
scheduler allocate 20000 1000






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