The Cisco IOS software will use the specified authentication key only when authentication is enabled for the backbone with the area area-id authentication router configuration command. The two authentication schemes, simple text and MD5 authentication, are mutually exclusive. You can specify one or the other or neither. Any keywords and arguments you specify after authentication-key key or message-digest-key keyid md5 key are ignored. Therefore, specify any optional arguments before such a keyword- argument combination.
Example 1: The following example establishes a virtual link with default values for all optional parameters: router ospf 201 network 36.0.0.0 0.255.255.255 area 36.0.0.0 area 36.0.0.0 virtual-link 36.3.4.5 Example 2: The following example establishes a virtual link with MD5 authentication: router ospf 201 network 36.0.0.0 0.255.255.255 area 36.0.0.0 area 36.0.0.0 virtual-link 36.3.4.5 message-digest-key 3 md5 sa5721bk47 Related Commands: area authentication, service password-encryption, show ip ospf default-information originateTo generate a default route into an OSPF routing domain, use the default-information originate router configuration command. To disable this feature, use the no form of this command. The syntax for this command (and the no form) is as follows: default-information originate [always] [metric metric-value] [metric-type type-value] {level-1 | level-1-2 | level-2} [route-map map-name] no default-information originate [always] [metric metric-value] [metric-type type-value] {level-1 | level-1-2 | level-2} [route-map map-name] Syntax Description:
Default: Disabled. Command Mode: Router configuration. Usage Guidelines: Whenever you use the redistribute or the default-information router configuration commands to redistribute routes into an OSPF routing domain, the Cisco IOS software automatically becomes an ASBR. However, an ASBR does not, by default, generate a default route into the OSPF routing domain. The software still needs to have a default route for itself before it generates one, except when you have specified the always keyword. When you use this command for the OSPF process, the default network must reside in the routing table and you must satisfy the route-map map-name keyword. Use the default-information originate always route-map map-name form of the command when you do not want the dependency on the default network in the routing table. Example: The following example specifies a metric of 100 for the default route redistributed into the OSPF routing domain and an external metric type of type 1: router ospf 109 redistribute igrp 108 metric 100 subnets default-information originate metric 100 metric-type 1 Related Commands: redistribute default-metricTo set default metric values for the BGP, EGP, OSPF, and RIP routing protocols, use this form of the default-metric router configuration command. To return to the default state, use the no form of this command. The syntax for this command (and the no form) is as follows: default-metric number no default-metric number Syntax Description:
distanceTo define an administrative distance, use the distance router configuration command. To remove a distance definition, use the no form of this command. The syntax for this command (and the no form) is as follows: distance weight [address mask [access-list-number | name]] [ip] no distance weight [address mask [access-list-number]] [ip]
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