ATM interface bouncing - dsl

Unanswered Question
Aug 2nd, 2010

I have a cisco 1721 taking a dsl connection.  The ios on the router is c1700-sy7-mz.124-13b.bin. The config on the interface is as follows:


interface ATM0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
ip address 192.168.11.110 255.255.255.252
no snmp trap link-status
pvc 0/35
  encapsulation aal5snap
!

It will bounce constantly and then stop for a couple of hours or even up to 24 hours then start again . The only error messages I get in the logs are:


Aug  1 12:48:12: %LINK-3-UPDOWN: Interface ATM0, changed state to down
Aug  1 12:48:13: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to down
Aug  1 12:48:26: %LINK-3-UPDOWN: Interface ATM0, changed state to up
Aug  1 12:48:27: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to up

additional info


nantucket-dsl#sh atm int atm0
Interface ATM0:
AAL enabled:  AAL5   AAL2, Maximum VCs: 23, Current VCCs: 1

VCIs per VPI: 256,
Max. Datagram Size: 4528
PLIM Type: ADSL - 704Kbps Upstream, DMT, TX clocking: LINE
219913 input, 215220 output, 9543580 IN fast, 7628445 OUT fast
Avail bw = 704
Config. is ACTIVE
nantucket-dsl#sh int atm0
ATM0 is up, line protocol is up
  Hardware is DSLSAR (with Alcatel ADSL Module)
  MTU 4470 bytes, sub MTU 4470, BW 704 Kbit, DLY 720 usec,
     reliability 255/255, txload 72/255, rxload 73/255
  Encapsulation ATM, loopback not set
  Encapsulation(s): AAL5  AAL2, PVC mode
  23 maximum active VCs, 256 VCs per VP, 1 current VCCs
  VC Auto Creation Disabled.
  VC idle disconnect time: 300 seconds
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 2w5d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 409
  Queueing strategy: Per VC Queueing
  5 minute input rate 203000 bits/sec, 36 packets/sec
  5 minute output rate 200000 bits/sec, 37 packets/sec
     9763801 packets input, 3546318016 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 394 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     7924230 packets output, 2455723750 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out

nantucket-dsl#sh atm pvc 0/35
Description: N/A
ATM0.1: VCD: 1, VPI: 0, VCI: 35
UBR, PeakRate: 704 (1661 cps)
AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0, Encapsize: 12
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM END CC Activate retry count: 3, OAM END CC Deactivate retry count: 3
OAM END CC retry frequency: 30 second(s),
OAM SEGMENT CC Activate retry count: 3, OAM SEGMENT CC Deactivate retry count: 3
OAM SEGMENT CC retry frequency: 30 second(s),
OAM Loopback status: OAM Disabled
OAM VC Status: Not Managed
ILMI VC status: Not Managed
InARP frequency: 15 minutes(s)
InPkts: 9599384, OutPkts: 7759542, InBytes: 3538045873, OutBytes: 2448385916
InPRoc: 54272, OutPRoc: 95985, Broadcasts: 0
InFast: 9545112, OutFast: 7629529, InAS: 0, OutAS: 0
InPktDrops: 0, OutPktDrops: 0/0/0 (holdq/outputq/total)
CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0
Out CLP=1 Pkts: 0
OAM cells received: 165732
F5 InEndloop: 165732, F5 InSegloop: 0,
F5 InEndcc: 0, F5 InSegcc: 0, F5 InAIS: 0, F5 InRDI: 0
F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0
OAM cells sent: 165622
F5 OutEndloop: 165622, F5 OutSegloop: 0,
F5 OutEndcc: 0, F5 OutSegcc: 0, F5 OutRDI: 0
F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0
OAM cell drops: 0
Status: UP


nantucket-dsl#sh int atm0.1
ATM0.1 is up, line protocol is up
  Hardware is DSLSAR (with Alcatel ADSL Module)
  Internet address is 192.168.11.110/30
  MTU 4470 bytes, BW 704 Kbit, DLY 720 usec,
     reliability 255/255, txload 45/255, rxload 78/255
  Encapsulation ATM
     9602297 packets input, 7836030953 bytes
     7761506 packets output, 2448636713 bytes
     165739 OAM cells input, 165629 OAM cells output
  AAL5 CRC errors : 0
  AAL5 SAR Timeouts : 0
  AAL5 Oversized SDUs : 0
  Last clearing of "show interface" counters 2w5d

I am seeing CRC errors but no input or output errors.  The router has already been replaced once.  Any thoughts on what might be causing this?

I have this problem too.
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Giuseppe Larosa Mon, 08/02/2010 - 12:53

Hello Ikadlic,

post

show dsl interface atm0

so that we can see noise margin in both directions

Hope to help

Giuseppe

lkadlik Mon, 08/02/2010 - 13:01

hi,


Here it is.  Thank you.

nantucket-dsl#sh dsl int atm0
ATM0
Alcatel 20150 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:       'ALCB'                          'BDCM'
Vendor Specific: 0x0000                          0x544D
Vendor Country:  0x00                            0xB5
Capacity Used:   41%                             97%
Noise Margin:    17.5 dB                          7.0 dB
Output Power:     6.5 dBm                        12.0 dBm
Attenuation:     27.0 dB                         14.0 dB
Defect Status:   None                            None
Last Fail Code:  Protocol error received
Selftest Result: 0x00
Subfunction:     0x15
Interrupts:      4528 (0 spurious)
PHY Access Err:  0
Activations:     81
LED Status:      ON
LED On Time:     100
LED Off Time:    100
Init FW:         embedded
Operation FW:    embedded
SW Version:      3.8131
FW Version:      0x1A04

                 Interleave             Fast    Interleave              Fast
Speed (kbps):          3360                0           704                 0
Cells:             14970716                0      70720063                 0
Reed-Solomon EC:        152                0             0                 0
CRC Errors:              23                0           526                 1
Header Errors:           17                0           397                 0
Bit Errors:               0                0
BER Valid sec:            0                0
BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin
00: 0 0 0 0 0 0 0 4 5 7 9 8 9 9 9 9
10: 9 A A A A A A A A 9 9 8 8 8 0 0
20: 0 0 0 0 0 0 0 2 2 2 3 3 4 4 4 4
30: 4 5 5 5 5 5 6 6 5 5 5 5 5 5 5 5
40: 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
50: 5 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6
60: 2 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
70: 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
80: 6 6 6 6 6 6 6 6 6 6 5 5 5 5 5 5
90: 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
A0: 6 5 6 5 6 6 6 6 6 6 6 6 6 6 6 6
B0: 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
C0: 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
D0: 5 5 5 5 5 5 5 5 5 5 5 4 5 5 4 4
E0: 4 4 4 4 4 4 4 4 4 4 4 4 4 3 3 3
F0: 3 2 3 3 2 2 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

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