05-15-2012 12:41 AM - edited 03-04-2019 04:21 PM
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
05-15-2012 03:35 AM
Errrr ... Your downstream (DS) attenuation is pretty high.
05-15-2012 03:41 AM
HI Leolohoo,
Could you please suggest me what to do now?
Thanks for your previous response.
Please help.
05-15-2012 03:42 AM
Could you please suggest me what to do now?
Talk to your provider and submit the "sh dsl interface" output to them.
05-15-2012 03:46 AM
Hi Leolaohoo,
So its nothing I could do from my side?
05-15-2012 03:50 AM
I'm afraid not.
05-15-2012 03:52 AM
Thank You Leolaohoo.
I will contact my ISP and I will come back to you.
once thank you so much for your response.
05-15-2012 07:15 AM
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.
05-15-2012 07:22 AM
HI paolo,
could you please tell me how to increase the output queue and how much?
05-15-2012 07:49 AM
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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