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ATM interface bouncing - dsl

lkadlik
Level 1
Level 1

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?

2 Replies 2

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Ikadlic,

post

show dsl interface atm0

so that we can see noise margin in both directions

Hope to help

Giuseppe

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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