Reference Guide

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Dell#
Enabling OSPFv2 Authentication
To enable or change various OSPF authentication parameters, use the following commands.
• Set a clear text authentication scheme on the interface.
CONFIG-INTERFACE mode
ip ospf authentication-key key
Configure a key that is a text string no longer than eight characters.
All neighboring routers must share password to exchange OSPF information.
• Set the authentication change wait time in seconds between 0 and 300 for the interface.
CONFIG-INTERFACE mode
ip ospf auth-change-wait-time seconds
This setting is the amount of time OSPF has available to change its interface authentication type.
When you configure the auth-change-wait-time, OSPF sends out only the old authentication
scheme until the wait timer expires. After the wait timer expires, OSPF sends only the new
authentication scheme. However, the new authentication scheme does not take effect immediately
after the authentication change wait timer expires; OSPF accepts both the old as well as new
authentication schemes for a time period that is equal to two times the configured authentication
change wait timer. After this time period, OSPF accepts only the new authentication scheme.
This transmission stops when the period ends.
The default is 0 seconds.
Configuring Virtual Links
Areas within OSPF must be connected to the backbone area (Area ID 0.0.0.0).
If an OSPF area does not have a direct connection to the backbone, at least one virtual link is required.
Configure virtual links on an ABR connected to the backbone.
• hello-interval — help packet
• retransmit-interval — LSA retransmit interval
• transmit-delay — LSA transmission delay
• dead-interval — dead router detection time
• authentication-key — authentication key
• message-digest-key — MD5 authentication key
To configure virtual links, use the following command.
• Configure the optional parameters of a virtual link.
CONFIG-ROUTEROSPF- id mode
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Open Shortest Path First (OSPFv2)