DSL Line dropping, need cable pull for ATM interface to come alive

Hi all,

We've recently changed our WAN to use ADSL and SDSL circuits rather than a combination of leased lines and ISDN dialup systems.

All seems well apart form one circuit where the installed Cisco 828 keeps falling over. There are intermittent problems on the circuit and the router simply stops responding until the SDSL cable is physically pulled. About 30 seconds after the cable is reconnected the router connects and all is well again.

It would appear that even though the circuit is ready it requires a cable pull or router restart to get the device going again.

If left the router will recover but only after a 5 minute period. When debugging the router without any connections present the following messages are sent every 5 mins:

*Mar 1 01:20:16.171: (Func: startup_timer_event, Line: 683) startup timer expired. 300000 *Mar 1 01:20:16.171: %GSHDSL-6-ACTIVATION: Interface ATM0, the line is still not activated. *Mar 1 01:20:16.191: (Func: gshdsl_softreset, Line: 153) soft reset over

Clearly there is a periodic timer for reactivating the ATM interface. Does anyone know how to change the period on this timer or have ideas as to how to recover from temporary circuit outages?

Never had any such problems when using ISDN or leased line technologies!

Many thanks,


Config as below:

Router#show start Using 2106 out of 131072 bytes ! version 12.3 no service pad service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname Router ! boot-start-marker boot-end-marker ! logging buffered 100000 debugging no logging console no logging monitor enable secret * ! username Router password * no aaa new-model ip subnet-zero ip dhcp excluded-address ! ip dhcp pool CLIENT import all network default-router lease 0 2 ! ip dhcp pool CLINET ! ! ! ! interface Ethernet0 * Ethernet Interface ip address ip tcp adjust-mss 1452 hold-queue 100 out ! interface ATM0 no ip address atm vc-per-vp 64 atm ilmi-keepalive 30 dsl equipment-type CPE dsl operating-mode GSHDSL symmetric annex B dsl linerate AUTO hold-queue 224 in pvc 0/38 encapsulation aal5mux ppp dialer dialer pool-member 1 ! ! interface Dialer1 ip address negotiated ip mtu 1492 encapsulation ppp ip tcp adjust-mss 1452 dialer pool 1 dialer remote-name redback dialer-group 1 ppp authentication chap pap callin ppp chap hostname * ppp chap password * ppp pap sent-username * password * ppp ipcp dns request ppp ipcp wins request hold-queue 224 in ! ip classless ip route Dialer1 ip http server ! logging dialer-list 1 protocol ip permit snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart snmp-server enable traps tty ! line con 0 exec-timeout 120 0 transport preferred all transport output all stopbits 1 line vty 0 4 exec-timeout 120 0 login local length 0 transport preferred all transport input all transport output all ! scheduler max-task-time 5000 ! end


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You should open a case with the Cisco TAC

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5 minutes, or 300 seconds, sounds like the VC idle-disconnect timer, which defaults to 300 seconds. I am not 100% sure where this timer can be set, try it under the pvc...I keep looking and will post if I find something...



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Thanks for the replies chaps. No support contract on this device with Cisco so they won't let me open a TAC!

I will have a look into the VC idle-disconnect timer. However, I'm thinking that the timer involved is some sort of activation timer (what ever that might be!) Seems to be looking to activate the interface every 300 seconds rather than disconnect it! Will change the VC and post results if the message frequency changes.

Thanks again, Dave

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I have only used ADSL.

I don't understand why however I always use:

no atm ilmi-keepalive

Maybe a lack of response to the keepalive is dropping the line?

One of the following should get it back

clear int d 1 clear int atm 0

conf t int xxx !

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