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Here is our diagram for this lab

OSPF Authentication

For this lab we will configure authentication for Area 0

 

First up some quick housecleaning

J1:

[edit]

jfry@J1# delete protocols ospf area 0 interface fe-0/0/7 authentication   

[edit]

jfry@J1# commit and-quit

commit complete

Exiting configuration mode

 

jfry@J1>

 

and R4

R4(config)#int e0

R4(config-if)#no ip ospf authentication   

R4(config-if)#no ip ospf message-digest-key 1

R4(config-if)#^Z

 

 

 

R4 up first!

Configure it for the area

R4(config)#router ospf 1

R4(config-router)#area 0 authentication message-digest

 

And then add our key under the interface:

R4(config-router)#int e0

R4(config-if)#ip ospf message-digest-key 1 md5 JunosIOS

R4(config-if)#

 

And there goes the neighborhood!

*Mar  1 10:28:16.905: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Ethernet0 from FULL to DOWN, Neighbor Down: Dead timer expired

R4(config-if)#

 

Time for J1!

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jfry@J1# set protocols ospf area 0.0.0.0 interface fe-0/0/7.0 authentication md5 1 key JunosIOS

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jfry@J1# set protocols ospf area 0.0.0.0 interface ge-0/0/0.0 authentication md5 1 key JunosIOS

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jfry@J1# set protocols ospf area 0.0.0.0 interface fe-0/0/2.0 authentication md5 1 key JunosIOS

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jfry@j1# commit and-quit

 

Hey, that command looks familiar!  That is because it is the same command we ran before J

 

Now for J2:

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jfry@J2# set protocols ospf area 0.0.0.0 interface ge-0/0/0.0 authentication md5 1 key JunosIOS

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jfry@J2# set protocols ospf area 0.0.0.0 interface ge-0/0/1.0 authentication md5 1 key JunosIOS

[edit]

jfry@J2# commit and-quit

 

and J3:

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jfry@J3# set protocols ospf area 0.0.0.0 interface fe-0/0/1.0 authentication md5 1 key JunosIOS

[edit]

jfry@J3# set protocols ospf area 0.0.0.0 interface fe-0/0/2.0 authentication md5 1 key JunosIOS

[edit]

jfry@J3# commit and-quit

 

And like that, we have OSPF authentication.  Not so much area on this one as Junos