OSPF Authentication
OSPF authentication causes routers to authenticate every OSPF message. To do so, the routers use the same preshared key value. This key might be in plain text, or it might be a hash digest from either the MD5 hashing algorithms (although SHA might also be supported depending on the type and version of Cisco IOS you are running). Table 17-2 lists the authentication types supported by OSPF.
Table 17-2 OSPF Authentication Types
On a router, OSPF authentication can be enabled on individual interfaces or an entire area. This ...
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