The OSPFv2 protocol uses SHA1 for authentication.
OSPF allows peer-to-peer authentication or client-to-server authentication. To authorize an authentication, use commands such as the following to configure shared secret keys for OSPFv2:
device(config-if-e1000-1/1)# ip ospf authentication-key P@$$w0rd
device(config-if-e1000-1/2)# ip ospf md5-authentication key-id 1 key P@$$w0rd
device(config-ospf-router)# area 2 virtual-link 2.3.4.5 md5-authentication key-id 2 key P@$$w0rd
device(config)# ipv6 ospf authentication ipsec spi %u esp sha1 encrypt #on-o
For more information on OSPFv2 authentication commands, refer to the Extreme NetIron Routing Configuration Guide.