OSPF is a very commonly used interior gateway protocol. This case study talks about some key ways to improve security in an OSPF implementation. The basic principles motivating these configurations remain the same.
OSPF neighbor router authentication works by authenticating the source of any OSPF routes received on the router. Any routes coming from a source that cannot be authenticated are discarded. Example 4-12 shows how authentication is setup in OSPF.
interface ethernet1 ip address 10.1.1.1 255.255.255.0 !The command below defines a key-ID, 100, the hashing method to use, md5, and the !actual key to use in ...