URGENT - problem with Cisco 876 and ADSL over ISDN

Unanswered Question
Sep 21st, 2007

I'm having problems with a Cisco 876 router. I have configured the router and when I connect the line to ADSLoverISDN interface and ATM interface seems to get up for 2 seconds then goes down.I cannot get a connection no matter what. Here is the configuration in case there is something wrong with it:

version 12.4

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname Router

!

boot-start-marker

boot-end-marker

!

!

no aaa new-model

!

resource policy

!

ip subnet-zero

ip cef

!

!

vpdn enable

!

vpdn-group 1

!

!

!

!

!

!

!

!

!

interface BRI0

no ip address

encapsulation hdlc

shutdown

!

interface ATM0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0.1 point-to-point

pvc 1/35

encapsulation aal5snap

pppoe-client dial-pool-number 1

!

!

interface FastEthernet0

!

interface FastEthernet1

!

interface FastEthernet2

!

interface FastEthernet3

!

interface Vlan1

ip address 192.168.1.1 255.255.255.0

ip nat inside

ip virtual-reassembly

ip tcp adjust-mss 1452

!

interface Dialer1

mtu 1492

ip address negotiated

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication chap callin

ppp chap hostname xxxxxx

ppp chap password 0 xxxxxx

!

ip classless

ip route 0.0.0.0 0.0.0.0 Dialer1

!

no ip http server

no ip http secure-server

ip nat inside source list 1 interface Dialer1 overload

!

access-list 1 permit 192.168.1.0 0.0.0.255

dialer-list 1 protocol ip permit

!

control-plane

!

!

line con 0

no modem enable

line aux 0

Can anyone help me with this as it's quite urgent?

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IgorHamzic Fri, 09/21/2007 - 07:46

Here is the debug atm events:

*Mar 1 04:15:25.095: DSL: Received response: 0x41

*Mar 1 04:15:30.375: DSL(ATM0): ADSL_ID_NACK_EXT, error code 0x81 at Far End

*Mar 1 04:15:30.375: DSL: Get FAR End Modem Vendor ID Failed

*Mar 1 04:15:30.375: Matching SAR to Line speed: Attempt number 1

cps 1 slots 21

APL Level 0 slots 21

APL Level 1 slots 21

*Mar 1 04:15:30.375: ATM0: atmsar_get_plim_info

*Mar 1 04:15:30.375: ATM0:atmsar_update_plimtype

*Mar 1 04:15:30.375: ATM0 atmsar_update_us_bandwidth(): upstream bw =634 Kbps

*Mar 1 04:15:30.379: DSL: SM: [DMTDSL_DO_OPEN -> DMTDSL_SHOWTIME]

*Mar 1 04:15:32.879: ATM0 DSL: Defect: LOM

*Mar 1 04:15:32.879: DSL: Defect: LOS LOF LCDf: retraining

*Mar 1 04:15:35.067: ATM0: atmsar_vc_dlcx

*Mar 1 04:15:35.067: (ATM0)1a_enable: delay activation of vcd=1, vc=0x82E91F20

*Mar 1 04:15:35.067: atmsar enable ATM0

*Mar 1 04:15:35.067: ATM0: atmsar_bringup_interface: Interface and atm_db flags are UP

*Mar 1 04:15:35.379: atmsar_atm_lineaction(ATM0): state=0

*Mar 1 04:15:35.379: DSL: SM: [DMTDSL_SHOWTIME -> DMTDSL_RE_OPEN]

*Mar 1 04:15:35.379: DSL: Send ADSL_CLOSE command.

*Mar 1 04:15:35.379: DSL(ATM0): Sent command 0x4

*Mar 1 04:15:36.847: DSL: Received response: 0x25

*Mar 1 04:15:36.847: DSL: Connection closed

*Mar 1 04:15:36.847: DSL: SM: [DMTDSL_RE_OPEN -> DMTDSL_DO_OPEN]

*Mar 1 04:15:36.847: DSL: Send ADSL_OPEN command.

*Mar 1 04:15:36.847: DSL(ATM0): Using subfunction 0x0

*Mar 1 04:15:36.847: LOCAL:Max noise margin for power cutoff 31

*Mar 1 04:15:36.847: DSL(ATM0): Sent extended command 0x3

*Mar 1 04:15:39.347: DSL(ATM0): 1: Modem state = 0x9

*Mar 1 04:15:41.847: DSL(ATM0): 2: Modem state = 0x9

*Mar 1 04:15:44.347: DSL(ATM0): 3: Modem state = 0x10

*Mar 1 04:15:45.067: ATM0: atmsar_vc_dlcx

*Mar 1 04:15:46.847: DSL(ATM0): 4: Modem state = 0x10

*Mar 1 04:15:49.347: DSL(ATM0): 5: Modem state = 0x10

*Mar 1 04:15:51.847: DSL(ATM0): 6: Modem state = 0x10

*Mar 1 04:15:54.347: DSL(ATM0): 7: Modem state = 0x10

*Mar 1 04:15:56.847: DSL(ATM0): 8: Modem state = 0x10

*Mar 1 04:15:56.979: DSL: Received response: 0x24

*Mar 1 04:15:56.979: DSL: Showtime!

*Mar 1 04:15:56.979: DSL(ATM0): Sent command 0x31

*Mar 1 04:15:56.991: DSL: Received response: 0x12

*Mar 1 04:15:56.991: DSL(ATM0): operation mode 0x2000000

*Mar 1 04:15:56.991: DSL(ATM0): Sent command 0x33

*Mar 1 04:15:56.995: DSL: Received response: 0x16

*Mar 1 04:15:56.995: DSL(ATM0): Far End Chip Country Code 0xFF

*Mar 1 04:15:56.995: DSL: Far End Chip Vendor ID GSPN

*Mar 1 04:15:56.995: DSL: Far End Chip Vendor ID Specific 0x0310

*Mar 1 04:15:56.995: DSL: Far End ITU Vendor STD Number 0x0003

*Mar 1 04:15:56.995: DSL(ATM0): Sent command 0x32

*Mar 1 04:15:57.003: DSL: Received response: 0x14

*Mar 1 04:15:57.003: DSL(ATM0): Near End Chip Country Code 0x0F

*Mar 1 04:15:57.003: DSL: Near End Chip Vendor ID STMI

*Mar 1 04:15:57.003: DSL: Near End Chip Vendor ID Specific 0x0000

*Mar 1 04:15:57.003: DSL: Near End ITU Vendor STD Number 0x0003

*Mar 1 04:15:57.003: DSL(ATM0): Sent extended command 0x5

*Mar 1 04:15:57.011: DSL(ATM0): Near End Modem Country Code 0xB5

*Mar 1 04:15:57.015: DSL: Near End Modem Vendor ID CSCO

*Mar 1 04:15:57.015: DSL: Near End Modem Vendor ID Specific 0x0000

*Mar 1 04:15:57.015: DSL: Near End Modem Version 12.4(4)T7`

*Mar 1 04:15:57.015: DSL: Near End Modem Serial Number FCZ112752TT

*Mar 1 04:15:57.015: DSL(ATM0): get Near End extended ITU ID succeeded

*Mar 1 04:15:57.015: DSL(ATM0): Sent extended command 0x5

*Mar 1 04:15:58.987: DSL: Received response: 0x41

*Mar 1 04:16:05.903: DSL(ATM0): ADSL_ID_NACK_EXT, error code 0x81 at Far End

*Mar 1 04:16:05.903: DSL: Get FAR End Modem Vendor ID Failed

*Mar 1 04:16:05.903: Matching SAR to Line speed: Attempt number 1

cps 1 slots 22

APL Level 0 slots 22

APL Level 1 slots 22

I just can't get the PCs to connect to the internet.

nikhil_kapoor Sun, 09/23/2007 - 07:14

Hi ,

I can see some commands missing in your config . Pls try to congiure them and try . Pls change the MTU to 1440as by deafult for TAM its 1440 . Where as i cant see vbr-nrt configured under pVC .

you configure your desired B.W

e.g :Vbr-nrt 128 128 1

interface ATM0

no ip address

no atm ilmi-keepalive

dsl operating-mode auto

!

interface ATM0.1 point-to-point

pvc 1/35

vbr-nrt 128 128 1 <<<<<<<<<<<<<<

encapsulation aal5snap

pppoe-client dial-pool-number 1

interface Dialer1

mtu 1440 <<<<<<<<<<<<<<<

ip address negotiated

ip nat outside

ip virtual-reassembly

encapsulation ppp

dialer pool 1

dialer-group 1

ppp authentication chap callin

ppp chap hostname xxxxxx

ppp chap password 0 xxxxxx

If still there is some issue with ATM then check the Tx path etc last hope replace the ATM card of the router .

HTH ... Cheers NK

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