OSPF HMAC-SHA Extended Authentication

This topic is to discuss the following lesson:

R1(config)#router ospf 1
R1(config-router)#network area 0
  • netmask instead of wild card?

Hi Arun,

That’s an error yes, thanks for reporting it. I just fixed it.


Hello Rene,

It looks like there is also fat finger issue. See below :slight_smile:

R2(config)#router ospf 1
R2(config-router)#network area 0

That is a typo yes, I’ll fix it. Thanks!


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Hello Azat

Yes, that should be and not .1. However, the OSPF process will interpret this as the network address of because of the wildcard mask. If you look at the config after this command, you will indeed see the following:

network area 0

But for completeness, I will let Rene know to clarify the command.

I hope this has been helpful!


Hello Rene,
I really enjoy this contents. And those are really easy to grasp. Also I appreciate your hard work that you put on this.
I have a little question. Can you explain a bit what is actually key chain is . I’m bit confused with the purpose of it. If you don’t mind

Thank you

Hello Sasindu

Great to hear that you find the content helpful! That’s always great to hear. We do our best!

A key chain is simply a data structure that is used within a Cisco router to help manage multiple passwords, which in keychain lingo are called keys. They are also sometimes called shared secrets. These keys are then used to enable secure communication with other devices that also support key-based authentication.

The data structure allows you to create a keychain, and on that keychain, you can create keys with IDs between 0 and 65535. Each key can then be configured with a key-string which is the password itself. Under the configuration of the key, you can add many more parameters such as cryptographic algorithms and lifetime durations.

Features that use key-based authentication include OSPF, EIGRP, BGP, and RIP.

You can find out more info at the following Cisco documentation.

I hope this has been helpful!


HI! Lazaros
Thanks for your reply. it’s helps a lot.

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