Chapter 50
| IP Routing Commands
Open Shortest Path First (OSPFv2)
– 1022 –
Command Usage
â—† Use authentication to prevent routers from inadvertently joining an
unauthorized area. Configure routers in the same area with the same password
or key. All neighboring routers on the same network with the same password
will exchange routing data.
â—† This command creates a password (key) that is inserted into the OSPF header
when routing protocol packets are originated by this device. Assign a separate
password to each network for different interfaces.
â—† When using simple password authentication, a password is included in the
packet. If it does not match the password configured on the receiving router,
the packet is discarded. This method provides very little security as it is possible
to learn the authentication key by snooping on routing protocol packets.
â—† When using Message-Digest 5 (MD5) authentication, the router uses the MD5
algorithm to verify data integrity by creating a 128-bit message digest from the
authentication key. Without the proper key and key-id, it is nearly impossible to
produce any message that matches the pre-specified target message digest.
â—† Before specifying plain-text password authentication for an interface, configure
a password with the ip ospf authentication-key command. Before specifying
MD5 authentication for an interface, configure the message-digest key-id and
key with the ip ospf message-digest-key command.
â—† The plain-text authentication-key, or the MD5 key-id and key, must be used
consistently throughout the autonomous system.
Example
This example enables message-digest authentication for the specified interface.
Console(config)#interface vlan 1
Console(config-if)#ip ospf authentication message-digest
Console(config-if)#
Related Commands
ip ospf authentication-key (1023)
ip ospf message-digest-key (1026)
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