FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
This article describes the reason for the error 'Mismatched Authentication Key' seen on Cisco when establishing OSPF adjacency with FortiGate using MD5 authentication.
Scope
FortiGate.
Solution
This happens because the MD5 key is not set on the FortiGate site. To configure the key in version 6.0 and below, use the following commands:
config router ospf config ospf-interface edit [Interface Entry Name] set interface [Interface] set authentication md5 set md5-key [Key ID] [Key String Value] next end
For version 6.2 and above:
config router ospf config ospf-interface edit [Interface Entry Name] set interface [Interface] set authentication md5 config md5-keys edit [Key ID] set key-string [Key String Value] next end next end
After that, verify if the OSPF adjacency is formed by the following commands:
