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Search Result
Solution # K19220969
Title How to configure OSPF authentication
Core Issue Routing protocols are used to exchange reachability information between routers. Routing information learned from peers is used to determine the next hop towards the destination. To route traffic correctly, it is necessary to prevent malicious or incorrect routing information from getting introduced into the routing table. This can be done by authenticating the routing updates exchanged between routers. Open Shortest Path First (OSPF) supports plain text authentication and Message Digest 5 (MD5) authentication.
Resolution To configure OSPF plain text authentication, specify the plain text password to be used for authentication on an interface, and enable authentication for the OSPF area. To assign a password to be used by neighboring routers using the OSPF plain text password authentication, issue the ip ospf authentication-key command in interface configuration mode.

To enable authentication for an OSPF area, issue the area authentication command in router configuration mode.

To configure OSPF MD5 authentication, specify a password to be used for authentication on an interface , and enable MD5 authentication for the area. To enable OSPF MD5 authentication and to specify the password to be used by neighboring routers to authenticate to each other, issue the ip ospf message-digest-key command in interface configuration mode. To enable MD5 authentication for an OSPF area, issue the area authentication command with the message-digest keyword in router configuration mode.

For information on OSPF authentication and configuration examples, refer to Sample Configuration for Authentication in OSPF.

Problem Type Configure
IP Routing Protocols OSPF
Routing Services Authentication
Direct URL http://www.ciscotaccc.com/iprout/showcase?case=K19220969