I am having a strange issue with IPSEC configuration. I have configured 2 cisco routers with IPSEC for the remote sites and the core is having a VPN concentrator.
The problem is, both never come online at the same time. If comes online the other router's session will be in DOWN-NEGOTATION state. Which ever comes first will form an IPSEC and can access the central resources at the core without any issues.
So, one is arresting other to form an IPSEC tunnel.
Please let me know if any one knows what might be the issue.