Given output from show crypto isakmp sa during DMVPN setup, which debug command will help identify the issue?

debug crypto isakmp is the correct command because ISAKMP (Internet Security Association and Key Management Protocol) is responsible for establishing and managing Security Associations (SAs) for IPsec, which is fundamental to DMVPN. When show crypto isakmp sa indicates issues, this debug command provides detailed information about the ISAKMP negotiation process, helping to pinpoint failures in phase 1 of IPsec tunnel establishment (e.g., mismatched pre-shared keys, incorrect encryption/hashing algorithms, or authentication problems). debug ip icmp is for troubleshooting ICMP-related issues, not crypto. debug crypto ipsec sa would be used after ISAKMP has successfully established phase 1 and you need to troubleshoot phase 2 (IPsec SA establishment), but the question implies ISAKMP is the current problem area. debug ssh is for Secure Shell issues, which are unrelated to DMVPN tunnel establishment.