CST: %CONTROLLER-5-UPDOWN:Controller E1 0/0/0,change state to down(AIS detected)

[Rps-Cheers]

HI My friends; What is the meaning of these logs? Is there any potential problem? Is there any solution? CST：%CONTROLLER-5-UPDOWN：Controller E1 0/0/0,change state to up CST: %LINK-3-UPDOWN: Interface Serial0/0/0:0,change state to up CST: %LINEPROTO-5-UPDOWN:Line protocol on Interface Serial0/0/0:0.change state to up CST: %CONTROLLER-5-UPDOWN:Controller E1 0/0/0,change state to down(AIS detected)

[Flavio Miranda]

Hi,

 The CONTROLLER on the present log is not Wireless Lan Controller. This message came from, mostly probably, a Router running some voice gateway. The cause of it can be lost of sync with the service provider. 

 By the way AIS stand for Alarm Indication Signal.

-If I helped you somehow, please, rate it as useful.-

[Rps-Cheers]

Yes, this is not a wireless controller. It is an alarm on an ISR device. I suspect it is a problem with the ISP. This problem may be caused by what the operator does.

[Rps-Cheers · Accepted solution]

I think this is a problem for ISP. Similar to alerts such as AIS and LOS, it seems to be a WAN problem. The factors related to the problem are equipment WAN interfaces, circuits,ISP' lines, etc.