ATM Interface Up and Down

[Phoungsakdavin]

Hello,

I configured my router 2621XM with WIC-1ADSL Card as a PPPOE client. It worked fine for about 1 week. But now it does not work. The problem is that the ATM interface is up and down again and again as shown below. Following is the config:

ras-01-sr#sh run

interface Loopback0

ip address xxxxxxxxxx

ip access-group 103 out

ip nat inside

ip tcp adjust-mss 1452

hold-queue 100 out

!

interface ATM0/0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

pvc 0/35

pppoe-client dial-pool-number 1

!

interface FastEthernet0/1

ip address xxxxxxxxxx

ip access-group 103 out

ip nat inside

ip tcp adjust-mss 1452

duplex auto

speed auto

hold-queue 100 out

!

interface Async33

ip address xxxxxxxxx

ip access-group 103 out

ip nat inside

encapsulation ppp

ip tcp adjust-mss 1452

dialer in-band

dialer string xxxxxxxx

dialer-group 1

async mode dedicated

peer default ip address pool dialup

ppp authentication pap

hold-queue 100 out

!

interface Dialer1

ip address negotiated

ip access-group 111 in

ip mtu 1492

ip nat outside

encapsulation ppp

ip tcp adjust-mss 1452

dialer pool 1

dialer remote-name redback

dialer-group 1

ppp authentication pap chap callin

ppp chap hostname xxxxxxxxxx

ppp chap password 7 xxxxxxxxxxxxxxx

ppp pap sent-username xxxxxxxxx password 7 xxxxxxxxxxxxx

ppp ipcp dns request

ppp ipcp wins request

!

ip local pool dialup xxxxxxxxxxxxx

ip classless

ip route 0.0.0.0 0.0.0.0 Dialer1

!

access-list 102 permit ip 192.168.1.0 0.0.0.255 any

access-list 103 permit ip 192.168.0.0 0.0.0.255 any

access-list 103 permit ip any any

dialer-list 1 protocol ip permit

!

ras-01-sr#sh ip int brie

Interface IP-Address OK? Method Status Protocol

ATM0/0 unassigned YES NVRAM down down

FastEthernet0/1 xxxxxxxxxxxxx YES NVRAM up down

Async33 xxxxxx YES NVRAM up up

Dialer1 unassigned YES NVRAM up up

Loopback0 xxxxxx YES NVRAM up up

*Mar 1 16:11:56.028: %LINK-3-UPDOWN: Interface ATM0/0, changed state to up

*Mar 1 16:11:57.029: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to up

*Mar 1 16:12:04.662: %LINK-3-UPDOWN: Interface ATM0/0, changed state to down

*Mar 1 16:12:05.663: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to down

ras-01-sr#

*Mar 1 15:48:42.443: %LINK-3-UPDOWN: Interface ATM0/0, changed state to up

*Mar 1 15:48:43.445: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to up

*Mar 1 15:48:54.086: %LINK-3-UPDOWN: Interface ATM0/0, changed state to down

*Mar 1 15:48:55.088: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to down

*Mar 1 15:49:11.491: %LINK-3-UPDOWN: Interface ATM0/0, changed state to up

*Mar 1 15:49:12.492: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to up

*Mar 1 15:49:24.087: %LINK-3-UPDOWN: Interface ATM0/0, changed state to down

*Mar 1 15:49:25.089: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to down

*Mar 1 15:49:51.556: %LINK-3-UPDOWN: Interface ATM0/0, changed state to up

*Mar 1 15:49:52.558: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to up

*Mar 1 15:50:04.085: %LINK-3-UPDOWN: Interface ATM0/0, changed state to down

*Mar 1 15:50:05.087: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0/0, changed state to down

end

Note: The line and configuratoin still keeping the same as it works before. DSLAM is HUAWEI MA5100.

I am not sure why it causes the problem weirdly.

Any feedback or reply would be appreciated.

Regards,

VIN

[arvindchari]

Could you post the contents of the

show controllers atm mod/slot command here? The counters contained therein would provide a better clue with respect to why the link might be flapping

Also, in case you havent already, check for the physical layer alarms using the LED's

[Phoungsakdavin]

Hello,

Thanks for your reply.

ras-01-sr#sh int

ATM0/0 is down, line protocol is down

Hardware is DSLSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 32 Kbit, DLY 16000 usec,

reliability 5/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 0 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input never, output 00:29:31, output hang never

ast clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7 Queueing strategy: Per VC Queueing

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

1 packets output, 70 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0output buffer failures, 0 output buffers swapped out

This is the ATM Interface when it was up.

ATM0/0 is up, line protocol is up

Hardware is DSLSAR (with Alcatel ADSL Module)

MTU 4470 bytes, sub MTU 4470, BW 32 Kbit, DLY 16000 usec,

reliability 10/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5 AAL2, PVC mode

23 maximum active VCs, 256 VCs per VP, 0 current VCCs

VC Auto Creation Disabled.

VC idle disconnect time: 300 seconds

Last input never, output 00:00:41, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 7

Queueing strategy: Per VC Queueing

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

2 packets output, 140 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

Note: I have noticed that when i plug the line into the card,the CD LED start blinking and then stop. When the LED stop blinking the interface is up. For 3 second, the CD LED start blinking again and then the atm interface is down.

Any possible solution to fix this problem?

Regards,

VIN

[arvindchari]

Could you also post the output of debug atm errrors command ?

Router#terminal monitor

Router#debug atm event

Im just wondering if CD stands for Carrier Detect and a blinking CD means no carrier.

That being the case, physically unplug the ADSL Cable (RJ-11) from the Cisco ADSL WIC ADSL interface. Wait for a few seconds. Plug the cable back in to cause the ADSL line to retrain.

[Phoungsakdavin]

Hi Arvind,

Sorry for late reply.

Please find the attached file to get the atm debug.

Please give me any advice on this.

Regards,

VIN