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Cisco877 dropout issues

Hi There,

I have a Cisco 877 router on a remote site, connected to an ADSL service servicing 5 users. It has been working fine except till lately; it started to drop out, currently it drops out an average of 3-4 times a day. Our provider has done different tests in the line and have found no issues with it. What i found strange is the "Total output drops" value from the "show int atm0" command, which is shown below, after one hour it was last rebooted. It seems that the external buffers are not coping with the traffic going thru...

ATM0 is up, line protocol is up

Hardware is MPC ATMSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 832 Kbit, DLY 440 usec,

reliability 255/255, txload 52/255, rxload 97/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

10 maximum active VCs, 1024 VCs per VP, 1 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input never, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2547

Queueing strategy: Per VC Queueing

5 minute input rate 317000 bits/sec, 44 packets/sec

5 minute output rate 170000 bits/sec, 39 packets/sec

523222 packets input, 327234720 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

580974 packets output, 277304847 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

Can someone please assist with what will be the right way to minimise the traffic going thru this interface? This router is connected to the main site LAN by an site-to-site tunnel (ipsec) so i still need to allow netbios and microsoft-ds traffic across this link.