In some cases, the built in backoff mechanism can prevent tunnels from forming again after failure. This document describes the procedure to reactivate the tunnels.
Tunnels not restarting with backoff mechanism enabled.
Problem:
The WX Operators Guide (OG) describes a built-in backoff mechanism that indicates whether remote devices attempt to reestablish disconnected tunnels. (Please refer to the OG, of the specific version that you are using, for information on how the backoff mechanism works.)
In some cases, the backoff time will be longer than we would want to wait. If you resolve the underlying cause of the tunnel going down and wish that the WX retries to form the tunnel, this article describes what can be done to force tunnel retry to start again.
Solution:In some cases, the backoff time will be longer than we would want to wait. If you resolve the underlying cause of the tunnel going down and wish that the WX retries to form the tunnel, this article describes what can be done to force tunnel retry to start again.
The built-in mechanism of retry backoff prevents WXs in the community from retrying to form tunnels forever at the same rate. In usual designs, it makes sense to try to form tunnels less often after some time. If you are hitting an issue with this mechanism, you can force the tunnels to retry with the following steps:
- Switch off the retry backoff mechanism on the WX that is not retrying.
config reduction set retry-backoff off
commit - If the remote WX was down too long, it could also happen that it has aged out of the registration database. If that happens, you can switch off the ageout timer on devices that need to keep retrying to form tunnels with the following command:
config reduction set ageout off
commit - Force the WX to register again with the registration server by clicking the Submit button on the WebUI: Device Setup > Registration Server > Submit.
After the above steps are performed, the remote sites should start retrying to form tunnels to this WX. Check the log file to see if the WX is retrying or if any other errors are displayed.
Troubleshooting
