cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Announcements

Cisco announces new innovations in SD-WAN, ISRs, SD-WAN Services, and Catalyst 9000 Series switches


77
Views
5
Helpful
2
Replies
Highlighted
Beginner

T1 CONTROLLER LOF detected

I saw LOF  detected and test with loopback the cards seems good, so is this issue with Telco or what else do I need to check? 

 

Dec 6 15:50:04.527: %CONTROLLER-5-UPDOWN: Controller T1 0/0/1, changed state to down (LOF detected)
Dec 6 15:50:06.527: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:1, changed state to down
Dec 6 15:50:06.527: %LINK-3-UPDOWN: Interface Serial0/0/1:1, changed state to down
Dec 6 15:50:22.527: %CONTROLLER-5-UPDOWN: Controller T1 0/0/1, changed state to up
Dec 6 15:50:24.527: %LINK-3-UPDOWN: Interface Serial0/0/1:1, changed state to up
Dec 6 15:50:36.651: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:1, changed state to up
Dec 6 15:50:37.643: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:1, changed state to down
Dec 6 15:50:39.691: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:1, changed state to up
Dec 6 15:52:08.527: %CONTROLLER-5-UPDOWN: Controller T1 0/0/1, changed state to down (LOF detected)
Dec 6 15:52:10.527: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:1, changed state to down

2 REPLIES
VIP Mentor

Re: T1 CONTROLLER LOF detected

Hello,

 

I would say in 99 percent of the cases, Loss of Frame is TELCO related. You could try to shut/no shut the controller, or unplug and plug back in the physical cable, but get with the Telco asap...

 

Also, make sure the settings below match with the TELCO side:

 

clock source {internal | line}
linecode {ami | b8zs | hdb3}
cablelength {long | short}

Beginner

Re: T1 CONTROLLER LOF detected

thanks for your help, we change the T1 card from both side resolved the issue

CreatePlease to create content
Ask the Expert- DMVPN on Cisco routers