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Urgent help: L2L VPN tunnel down automatically and never came up unless peer end IP address change

Hello,

We have L2L VPN tunnel configured on 3925 Version 15.2(4)M6a, RELEASE SOFTWARE (fc1) with one common VRF which will be used among all the customers.

For one of the customer we have more than 15 L2L VPN tunnel configured and suddenly one of the L2L VPN tunnel goes down.

We have tried by resetting tunnel but no luck. Also checked phase1/2 configuration at both end and no changes observed.

No log messages observed. At the end we have just changed peer end IP address on the same router and tunnel is UP and ACTIVE.

We have observed this issue with two different L2L VPN tunnel and just changing peer end IP address, issue gets resolved.

At our end ISP is same with two different public IP address.

Example:

Customer A has VPN tunnel configured at our end with IP 1.1.1.1 and suddenly tunnel goes down.

After changing peer end IP add at our end from 1.1.1.1 to 2.2.2.2 tunnel is UP and ACTIVE. Also after some days if we again move this tunnel to 1.1.1.1 tunnel is UP and ACTIVE.

Please help me to understand what will be the exact cause of this type of issue.

 

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