Explanation/Reference:
Explanation:
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
show crypto isakmp sa-Displays the state for the ISAKMP security association (SA).

show crypto engine connections active -Displays the total encrypts/decrypts per SA.

show crypto ipsec sa-Displays the statistics on the active tunnels.

show ip route-Displays the routing table.

show ip eigrp neighbor-Displays the EIGRP neighbors.

show ip nhrp-Displays the IP Next Hop Resolution Protocol (NHRP) cache, optionally limited to

dynamic or static cache entries for a specific interface.
show crypto socket-Displays the cryptosocket table between NHRP and IPSec.

References:
http://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/29240- dcmvpn.html#veri