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In a dual-hub dual-DMVPN scenario with routers running Cisco IOS Software Release 12.3, a spoke-to-spoke tunnel fails to come up over a secondary tunnel interface
The problem occurs due to the presence of Cisco bug ID CSCed68627.
This issue is seen if a dual-hub dual-Dynamic Multipoint VPN (DMVPN) configuration is used when there is already a dynamic spoke-to-spoke tunnel over a primary tunnel interface, and the primary hub router is unavailable.
It appears that when the primary hub fails, as the IP next-hop converges to the secondary DMVPN, the dynamic spoke-to-spoke tunnel fails to come up.
As a workaround, perform either of these steps:
Use the dual-hub single DMVPN network configuration.
Download and upgrade to Cisco IOS Software Release 12.4(5).