Install Guide

CONFIG-INTERFACE mode
ip ospf message-digest-key keyid md5 key
○ keyid: the range is from 1 to 255.
○ Key: a character string.
NOTE: Be sure to write down or otherwise record the key. You cannot learn the key after it is configured. You must be
careful when changing this key.
NOTE: You can configure a maximum of six digest keys on an interface. Of the available six digest keys, the switches
select the MD5 key that is common. The remaining MD5 keys are unused.
● Change the priority of the interface, which is used to determine the Designated Router for the OSPF broadcast network.
CONFIG-INTERFACE mode
ip ospf priority number
○ number: the range is from 0 to 255 (the default is 1).
● Change the retransmission interval between LSAs.
CONFIG-INTERFACE mode
ip ospf retransmit-interval seconds
○ seconds: the range is from 1 to 65535 (the default is 5 seconds).
The retransmit interval must be the same on all routers in the OSPF network.
● Change the wait period between link state update packets sent out the interface.
CONFIG-INTERFACE mode
ip ospf transmit-delay seconds
○ seconds: the range is from 1 to 65535 (the default is 1 second).
The transmit delay must be the same on all routers in the OSPF network.
To view interface configurations, use the show config command in CONFIGURATION INTERFACE mode.
To view interface status in the OSPF process, use the show ip ospf interface command in EXEC mode.
The bold lines in the example show the change on the interface. The change is reflected in the OSPF configuration.
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.
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Open Shortest Path First (OSPFv2 and OSPFv3)