Every 1941 flapping at the same time.

[Chop87]

Hello,

We have roughly 50 1941 Cell routers in our environment. For the past 3 months ,once a month, they have all went down at the same time, and came back up at the same time. The outage was roughly 1 minute long. 

In each router, they all say the same thing in the logs - 

04:38:19.116 EDT: %CELLWAN-2-BEARER_DELETED: Instance id=0, Default bearer (bearer_id=6) in Cellular0/0/0 is now deleted.
04:38:21.116 EDT: %LINK-3-UPDOWN: Interface Cellular0/0/0, changed state to down
04:38:21.116 EDT: %IPMOBILE-5-TUNNELDELETE: Mobile IP tunnel Tunnel0 deleting
04:38:21.788 EDT: %CELLWAN-2-BEARER_UP: Instance id=0, Default bearer (bearer_id=6) in Cellular0/0/0 is now UP
04:38:24.112 EDT: %LINK-3-UPDOWN: Interface Cellular0/0/0, changed state to up
04:38:25.184 EDT: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up

[balaji.bandi]

they have all went down at the same time,  <<- this means device rebooted or lost connection and come back automatically ?

if the router not rebooted and you lost the connection and it come back, then look the below link may help you :

https://www.cisco.com/c/en/us/support/docs/ip/internet-protocol-ip/212036-Troubleshoot-Cellular-Flaps-due-to-Beare.html

[luis_cordova]

Hi @Chop87 ,

Maybe this link can help you:

https://www.cisco.com/c/en/us/support/docs/ip/internet-protocol-ip/212036-Troubleshoot-Cellular-Flaps-due-to-Beare.html

Regards

[paul driver]

Hello

Having 50 cell routers going down at the same time is quite unusual unless all l these routers happen to terminate into a hub device - if so I would start my investigation on the hub?