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Output Drops on ATM Interface. 887 Router

HI I have cisco 887M-K9 router and I can see output drops are increasing on ATM interface.

can somebody please suggest me whats the problem and how to solve it.

      

POP-ROUTER05#sh interfaces atM 0
ATM0 is up, line protocol is up
  Hardware is MPC ATMSAR (with Alcatel ADSL Module), address is 44d3.ca9c.1c0a (bia 44d3.ca9c.1c0a)
  Description: Line No 02079879632
  MTU 4470 bytes, sub MTU 4470, BW 608 Kbit/sec, DLY 600 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ATM, loopback not set
  Keepalive not supported
  Encapsulation(s): AAL5
  20 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: 3464
  Queueing strategy: Per VC Queueing
  30 second input rate 2000 bits/sec, 3 packets/sec
  30 second output rate 3000 bits/sec, 2 packets/sec
     445215 packets input, 438223041 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 10 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     312654 packets output, 41276722 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
POP-ROUTER05#show dsl interface
ATM0
Alcatel 20190 chipset information
                ATU-R (DS)                      ATU-C (US)
Modem Status:    Showtime (DMTDSL_SHOWTIME)
DSL Mode:        ITU G.992.1 (G.DMT) Annex A
ITU STD NUM:     0x01                            0x1
Vendor ID:       'STMI'                          'GSPN'
Vendor Specific: 0x0000                          0x0008
Vendor Country:  0x0F                            0xFF
Chip ID:         C196 (3) capability-enabled
DFE BOM:         DFE3.0 Annex M (3)
Capacity Used:   100%                            100%
Noise Margin:    10.0 dB                         13.0 dB
Output Power:    19.5 dBm                        12.0 dBm
Attenuation:     51.0 dB                         29.0 dB
FEC ES Errors:    0                               0
ES Errors:       172                             16
SES Errors:       0                               0
LOSES Errors:     0                               0
UES Errors:       0                               0
Defect Status:   None                            None
Last Fail Code:  None
Watchdog Counter: 0xB3
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction:     0x00
Interrupts:      8258 (0 spurious)
PHY Access Err:  0
Activations:     2
LED Status:      ON
LED On Time:     100
LED Off Time:    100
Init FW:         init_AMR-4.0.015_no_bist.bin
Operation FW:    AMR-4.0.015.bin
FW Source:       embedded
FW Version:      4.0.15

                 Interleave             Fast    Interleave              Fast
Speed (kbps):          4672                0           608                 0
Cells:              7221809                0      90726985                 0
Reed-Solomon EC:      61262                0            14                 1
CRC Errors:             255                0             4                 2
Header Errors:          207                0             2                 2
Total BER:                40E-40                 0E-0
Leakage Average BER:      40E-40                 0E-0
                        ATU-R (DS)      ATU-C (US)
Bitswap:               enabled            enabled
Bitswap success:          0                   0
Bitswap failure:          0                   0

LOM Monitoring : Disabled


DMT Bits Per Bin
000: 0 0 0 0 0 0 0 0 2 5 6 8 8 9 9 9
010: A A A A A A A 8 9 8 8 8 7 7 6 5
020: 0 3 5 6 6 7 7 7 7 8 8 8 8 8 7 8
030: 8 8 8 7 8 7 6 5 5 7 8 8 9 9 A A
040: 0 A B A A A A B B B B A B A A A
050: A A A A B 2 A A C C A B A A B A
060: A A A A A A A A A A C A A B A A
070: A A A A A C 9 9 9 9 A A A A A 9
080: 9 6 5 9 9 A A A 9 A A 9 8 9 9 9
090: 7 A 7 A 9 A 9 A 9 8 8 8 5 5 7 7
0A0: 6 4 7 7 8 7 5 0 6 6 7 5 7 4 7 8
0B0: 0 2 4 5 6 7 7 6 7 7 7 7 6 6 6 6
0C0: 4 5 5 5 5 5 5 5 5 5 4 4 4 3 2 2
0D0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0E0: 0 0 0 0 0 0 0 0 2 2 2 2 2 2 2 0
0F0: 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

Everyone's tags (5)
9 REPLIES
Hall of Fame Super Gold

Output Drops on ATM Interface. 887 Router

Errrr ... Your downstream (DS) attenuation is pretty high.

New Member

Output Drops on ATM Interface. 887 Router

HI Leolohoo,

Could you please suggest me what to do now?

Thanks for your previous response.

Please help.

Hall of Fame Super Gold

Output Drops on ATM Interface. 887 Router

Could you please suggest me what to do now?

Talk to your provider and submit the "sh dsl interface" output to them.

New Member

Re: Output Drops on ATM Interface. 887 Router

Hi Leolaohoo,

So its nothing I could do from my side?

Hall of Fame Super Gold

Output Drops on ATM Interface. 887 Router

I'm afraid not.

New Member

Re: Output Drops on ATM Interface. 887 Router

Thank You Leolaohoo.

I will contact my ISP and I will come back to you.

once thank you so much for your response.

Hall of Fame Super Gold

Re: Output Drops on ATM Interface. 887 Router

That is absolutely normal, upload is not so fast, so packets are dropped.

You can increase output queue a little, but do not expect to ever see zero packets drop.

New Member

Re: Output Drops on ATM Interface. 887 Router

HI paolo,

could you please tell me how to increase the output queue and how much?

Hall of Fame Super Gold

Re: Output Drops on ATM Interface. 887 Router

Leave alone queue tuning for now

Let it working few days then check again.

You have to look at the drop ratio over total packets. E.g 1 per thousand is almost OK, 1 per cent is not.

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