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Community Member

ATM interfaces suddenly stopped communicating

I have a 4700 that attaches to an LS1010 via a fiber connection. The connection suddenly ceased to pass data. I have changed out the fiber patch cords, tested the fiber backbone, both warm and cold booted both devices, etc.etc...... The interface on the router is atm0 and on the ls1010 it is atm 0/0/0. A 'sh int' shows both interfaces to be up, up. 'sh cdp neighbors' will list all the devices both are attached to *except* through that particular atm interface. If I put atm 0/0/0 into 'loopback line' mode I can get very sporadic ping responses from the 4700. 'loopback diagnostic' on either interface shows that they can ping themselves just fine. I've spoken with my ISP and the assured me that the PVC's haven't changed....I'm totally at a loss. What could be causing this?

7 REPLIES
Silver

Re: ATM interfaces suddenly stopped communicating

There is not a lot of information here to go on. Possibly a bad ATM-PA

Might include the following:

"show run int "

"show controller "

"show atm vc "

Do you use oam for end to end pvc management? oam-pvc [manage] [frequency]

Do you see CRC's or OverSizedSDU's in your "show int /or pvc"?

If so is your provider shaping? Are you exceeding your rate?

What errors are logged to the logging buffer when this traffic stops? "show log"

What code are you running "show version"

If you can provide this information possibly someone could help you more.

Hope this helps,

Don

Community Member

Re: ATM interfaces suddenly stopped communicating

Here is the data from the 4700:

interface ATM0

no ip address

no ip directed-broadcast

ip nat outside

logging event subif-link-status

atm uni-version 3.0

atm pvc 1 0 5 qsaal

atm pvc 2 0 16 ilmi

no atm ilmi-keepalive

end

CFHS-outside#sh run int atm0.3

Building configuration...

Current configuration:

!

interface ATM0.3 point-to-point

description Connection to Net Work VA

ip address 65.162.90.26 255.255.255.252

ip access-group 101 in

ip access-group 121 out

no ip directed-broadcast

ip nat outside

atm pvc 35 0 35 aal5snap

end

CFHS-outside#sh controller atm0

^

% Invalid input detected at '^' marker.

CFHS-outside#sh controller atm 0

ATM Unit 0, Slot 0, Type ATMizer BX-50, Hardware Version 2

ATM Xilinx Code, Version 2, ATMizer Firmware, Version 3.0

Public SRAM 65536 bytes, Private SRAM 524288 bytes, I/O Base Addr 0x3C000000

PLIM Type OC-3 Multi-Mode Fiber, Version 4

Network Transmit Clock

NIM IS Operational, Configuration OK

DMA Read 12, DMA Write 12

NIM Hardware Registers

pc_id 0x000F, pc_rev 0x0002, mem_config 0x0023, plim_id/rev 0x0402

control 0x1F3F, err_stat 0x1081, lirq_vec 0x0000

PLIM Hardware Registers

mr 0x30, mcfgr 0x70, misr 0x00, mcmr 0x3F,

mctlr 0x19, cscsr 0x50, crcsr 0x20, rsop_cier 0x06,

rsop_sisr 0x00, rsop_bip80r 0x00, rsop_bip81r 0x00, tsop_ctlr 0x80,

tsop_diagr 0x80, rlop_csr 0x00, rlop_ieisr 0x30, rlop_bip8_240r 0x00,

rlop_bip8_241r 0x00, rlop_bip8_242r 0x00, rlop_febe0r 0x00, rlop_febe1r 0x00,

rlop_febe2r 0x00, tlop_ctlr 0x80, tlop_diagr 0x80, rpop_scr 0x00,

rpop_isr 0x00, rpop_ier 0x00, rpop_pslr 0x13, rpop_pbip80r 0x00,

rpop_pbip81r 0x00, rpop_pfebe0r 0x00, rpop_pfebe1r 0x00, tpop_cdr 0x00,

tpop_pcr 0x00, tpop_ap0r 0x00, tpop_ap1r 0x90, tpop_pslr 0x13,

tpop_psr 0x00, racp_csr 0x04, racp_iesr 0x01, racp_mhpr 0x00,

racp_mhmr 0x00, racp_checr 0x00, racp_uhecr 0x00, racp_rcc0r 0x8B,

racp_rcc1r 0x00, racp_rcc2r 0x00, racp_cfgr 0xFC, tacp_csr 0x04,

tacp_iuchpr 0x00, tacp_iucpopr 0x6A, tacp_fctlr 0x10, tacp_tcc0r 0xFF,

tacp_tcc1r 0xFF, tacp_tcc2r 0xFF, tacp_cfgr 0x08,

Software data structures

HwIdbAddr DevCtlAddr id2pakT

0x613CAD14 0x613CC5FC 0x613CD7C8

Free Buffer Index Queues

QueueName BaseAddr WrPointer Level High Cach/Buff/PktdMiss

Small 0x3C040200 0x3C040200 0/128 0 0000/0000/0000

Medium 0x3C040300 0x3C040300 0/128 0 0000/0000/0000

Big 0x3C040400 0x3C040400 0/128 0 0000/0000/0000

Large 0x3C040500 0x3C040516 96/128 96 0000/0000/0000

SemiHuge 0x3C040600 0x3C040600 0/128 0 0000/0000/0000

Huge 0x3C040700 0x3C040700 0/128 0 0000/0000/0000

Read Index Queues

QueueName BaseAddr RdPointer Size

Receive Ready 0x3C040800 0x3C040856 128

Transmit Done 0x3C040A00 0x3C040A5E 128

Event 0x3C042F00 0x3C042F00 128

Write Index Queues

QueueName BaseAddr WrPointer Level

Transmit Ready 0x3C040900 0x3C04095E 0/128

Event Queue

BaseAddr RdPointer Size LastEvent

0x3C042F00 0x3C042F00 64 0x01

Command/Response Queue

BaseAddr Pointer Level WrIndx RdIndx Pend LastRsp

0x3C040B00 0x3C040C68 0/128 5 5 0 0x00

Packet Descriptor Table

BaseAddr Total Receive Transmit

0x3C042F80 127 96/96 0/31

Packet switching

Fastswitched 0

To-process 1835

Bridged 0

Transmit errors

Restarts 0

Pktid misses 0

Bad pktid 0

Wrong queue 0

No pkt 0

Tx errors 0

Bad VC 7

Receive errors

Bad pktid 0

Wrong queue 0

No pkt 0

CRC 0

Length 0

Giant 0

Reas tout 0

AAL5 format 0

Sh at vc 35:

ATM0.3: VCD: 35, VPI: 0, VCI: 35

PeakRate: 155000, Average Rate: 155000

AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x1

OAM frequency: 0 second(s)

InARP DISABLED

InPkts: 0, OutPkts: 520, InBytes: 0, OutBytes: 41115

InPRoc: 0, OutPRoc: 520

InFast: 0, OutFast: 0, InAS: 0, OutAS: 0

OAM cells received: 0

OAM cells sent: 0

Status: UP

and from the LS1010:

interface ATM0/0/0

no ip address

no ip directed-broadcast

no atm auto-configuration

atm maxvpi-bits 3

atm maxvci-bits 10

end

cf-ls1010#sh controller atm 0/0/0

IF Name: ATM0/0/0 Chip Base Address: A8808000

Port type: OC3 Port rate: 155 Mbps Port medium: MM Fiber

Port status:Good Signal Loopback:None Flags:8308

TX Led: Traffic Pattern RX Led: Traffic Pattern TX clock source: network-de

rived

Framing mode: sts-3c

Cell payload scrambling on

Sts-stream scrambling on

OC3 counters:

Key: txcell - # cells transmitted

rxcell - # cells received

b1 - # section BIP-8 errors

b2 - # line BIP-8 errors

b3 - # path BIP-8 errors

ocd - # out-of-cell delineation errors - not implemented

g1 - # path FEBE errors

z2 - # line FEBE errors

chcs - # correctable HEC errors

uhcs - # uncorrectable HEC errors

txcell:20461, rxcell:31150

b1:49, b2:186, b3:81, ocd:0

g1:46, z2:33, chcs:0, uhcs:14

OC3 errored secs:

b1:1, b2:1, b3:1, ocd:0

g1:1, z2:1, chcs:0, uhcs:1

OC3 error-free secs:

b1:6500, b2:6500, b3:6500, ocd:0

g1:6500, z2:6500, chcs:6501, uhcs:6500

Clock reg:8F

mr 0x30, mcfgr 0x70, misr 0xE0, mcmr 0xEF,

mctlr 0x08, cscsr 0x50, crcsr 0x20, rsop_cier 0x00,

rsop_sisr 0x00, rsop_bip80r 0x00, rsop_bip81r 0x00, tsop_ctlr 0x00,

tsop_diagr 0x00, rlop_csr 0x00, rlop_ieisr 0x0F, rlop_bip8_240r 0x00,

rlop_bip8_241r 0x00, rlop_bip8_242r 0x00, rlop_febe0r 0x00, rlop_febe1r 0x00,

rlop_febe2r 0x00, tlop_ctlr 0x80, tlop_diagr 0x80, rpop_scr 0x00,

rpop_isr 0xFF, rpop_ier 0xFF, rpop_pslr 0x13, rpop_pbip80r 0x00,

rpop_pbip81r 0x00, rpop_pfebe0r 0x00, rpop_pfebe1r 0x00, tpop_cdr 0x00,

tpop_pcr 0x00, tpop_ap0r 0x00, tpop_ap1r 0x90, tpop_pslr 0x13,

tpop_psr 0x00, racp_csr 0x04, racp_iesr 0x17, racp_mhpr 0x00,

racp_mhmr 0x00, racp_checr 0x00, racp_uhecr 0x00, racp_rcc0r 0x01,

racp_rcc1r 0x00, racp_rcc2r 0x00, racp_cfgr 0xFC, tacp_csr 0x04,

tacp_iuchpr 0x00, tacp_iucpopr 0x6A, tacp_fctlr 0x00, tacp_tcc0r 0x00,

tacp_tcc1r 0x00, tacp_tcc2r 0x00, tacp_cfgr 0x08,

phy_tx_cnt:2094, phy_rx_cnt:3228

cf-ls1010#sh atm vc signalling

Interface VPI VCI CallRef X-Interface VPI VCI CallRef Type

ATM0/1/0 0 37 6 ATM2/0/0 0 92 14 PTP

ATM0/1/0 0 39 7 ATM2/0/0 0 94 16 PTP

ATM0/1/0 0 42 9 *ATM1/0/0 0 36 2 PTP

ATM0/1/0 0 43 10 *ATM1/0/0 0 38 3 PTP

*ATM0/1/0 0 38 1 *ATM2/0/0 0 93 15 MTP

*ATM0/1/0 0 40 2 *ATM2/0/0 0 95 17 MTP

*ATM0/1/3. 14 116 2340 ATM1/0/0 0 37 5 MTP

*ATM0/1/3. 14 117 2341 ATM1/0/0 0 39 6 MTP

*ATM0/1/3. 14 118 2342 ATM1/0/0 0 41 7 PTP

ATM1/0/0 0 37 5 *ATM0/1/3. 14 116 2340 MTP

ATM1/0/0 0 39 6 *ATM0/1/3. 14 117 2341 MTP

ATM1/0/0 0 41 7 *ATM0/1/3. 14 118 2342 PTP

*ATM1/0/0 0 36 2 ATM0/1/0 0 42 9 PTP

*ATM1/0/0 0 38 3 ATM0/1/0 0 43 10 PTP

ATM2/0/0 0 92 14 PTP ATM0/1/0 0 37 6 PTP

*ATM2/0/0 0 93 15 MTP*ATM0/1/0 0 38 1 MTP

ATM2/0/0 0 94 16 PTP ATM0/1/0 0 39 7 PTP

*ATM2/0/0 0 95 17 MTP*ATM0/1/0 0 40 2 MTP

And this is the interface that connects to the ISP from the LS1010:

interface ATM0/1/0

no ip address

no ip directed-broadcast

no atm auto-configuration

no atm address-registration

no atm ilmi-enable

atm iisp side user

atm maxvci-bits 9

atm pvc 108 35 interface ATM0/0/0 0 35

clock source loop-timed

scrambling cell-payload

end

Boy, I hope this helps, because I'm still down.

Thanks

Silver

Re: ATM interfaces suddenly stopped communicating

You are not getting any pkts/cell on your vc 35 only OutPkts.

Sh at vc 35:

ATM0.3: VCD: 35, VPI: 0, VCI: 35

PeakRate: 155000, Average Rate: 155000

AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x1

OAM frequency: 0 second(s)

InARP DISABLED

InPkts: 0, OutPkts: 520, InBytes: 0, OutBytes: 41115

InPRoc: 0, OutPRoc: 520

InFast: 0, OutFast: 0, InAS: 0, OutAS: 0

OAM cells received: 0

OAM cells sent: 0

Status: UP

Are you sure your VC is correct/has not changed?

Could you change ports on your ls1010 and remap VC to new port and try?

There could be something HW going on with your router or ls1010 pam but I do not see it.

Hope this helps,

Don

Community Member

Re: ATM interfaces suddenly stopped communicating

I have moved the fiber on the ls1010 from atm0/0/0 to atm0/0/3 and adjusted the configuration to reflect. I still am unable to pass data between data between the atm0/0/3 on the light stream and atm0.3 on the 4700. I cleared all counters and checked them after a few minutes. Both interfaces show both input and output packets, yet all input packets have CRC errors on both ends. On the ls1010 int atm0/0/1 still works perfectly, so although a single port may have burned up, I seems that the whole blade has not. If that were the case I would think that moving to int atm0/0/3 would have solved the problem. If there is indeed a hardware issue, I am unsure what to do to determine which end has gone bad since both seem to be operational.

Silver

Re: ATM interfaces suddenly stopped communicating

CRCs are normally due to one of three things.

Policing (cell drops and AAL5PDU not being put back together correctly

Noise, gain hits, or other transmission problems on the data-link equipment.

A faulty or failing ATM interface.

Since the only thing that has remained consistant in your testing so far is the 4700 ATM interface I would suspect this rather than the 1010. Here is a link that I hope will give you more information and insight into troubleshooting your problem.

http://www.cisco.com/en/US/partner/tech/tk39/tk48/technologies_tech_note09186a00800c93ef.shtml

Hope this helps,

Don

Community Member

Re: ATM interfaces suddenly stopped communicating

Don, please let me thank you for all your help. It turned out to be the ISP. It took one of your replys forwarded to them to get them to take another look at my case, and they have finally fixed their missing PVC. Thanks again.

Matthew

Community Member

Re: ATM interfaces suddenly stopped communicating

You could try some ATM pings from the Lightstream.

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