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VDSL Dialer 0 constant high output rate

I have an issue with monitoring inbound and outbound traffic on the dialer 0 interface of a particular 887 router. The circuit is a VDSL with a max upload it 10Mbps. It's showing a constant high output rate in the region of 20Mbps. I've not seen this behavior before, usually the D0 stats match the virtual interface and Eth0.

 

Dialer0 is up, line protocol is up (spoofing)
Hardware is Unknown
Description: OUTSIDE INTERFACE
Internet address is x.x.x.x/32
MTU 1500 bytes, BW 95754 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 255/255, rxload 1/255
Encapsulation PPP, LCP Closed, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 1 seconds on reset
Interface is bound to Vi2
Last input never, output never, output hang never
Last clearing of "show interface" counters 00:09:20
Input queue: 0/224/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 71815 kilobits/sec
5 minute input rate 133000 bits/sec, 31 packets/sec
5 minute output rate 29673910000 bits/sec, 4 packets/sec
17457 packets input, 966376480791 bytes
17423 packets output, 2164666162406 bytes
Bound to:
Virtual-Access2 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 56 Kbit/sec, DLY 20000 usec,
reliability 255/255, txload 177/255, rxload 255/255
Encapsulation PPP, LCP Open
Open: IPCP
PPPoE vaccess, cloned from Dialer0
Vaccess status 0x44, loopback not set
Keepalive set (10 sec)
Interface is bound to Di0 (Encapsulation PPP)
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters 00:09:20
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 132000 bits/sec, 31 packets/sec
5 minute output rate 39000 bits/sec, 33 packets/sec
17104 packets input, 8649607 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
17423 packets output, 2645222 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions

 Cisco IOS Software, C800 Software (C800-UNIVERSALK9-M), Version 15.1(4)M4, RELEASE SOFTWARE (fc1)

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