08-02-2010 09:03 AM - edited 03-04-2019 09:16 AM
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?
08-02-2010 12:53 PM
Hello Ikadlic,
post
show dsl interface atm0
so that we can see noise margin in both directions
Hope to help
Giuseppe
08-02-2010 01:01 PM
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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