Welcome in to the final video in our Authentication Lab. We've set up Authentication on the Xing Router going over to Amestris and now the Xing Router has disappeared from the EIGRP neighbor table on the Amestris Router. So let's over and set up Authentication going to Drachma as well. So we'll do Show Run Interface Serial 0 slash 1 because I'm a big fan of consistency, we're going to copy these two lines out and that's what we're going to apply to all of the other interfaces no matter serial 00, serial 1, whatever it might be. So we'll go in here put it into Notepad just so we have it, copy it all off to the Clipboard, Show CDP Neighbor. So serial 00 is the other interface. Going up to Drachma, so we'll do Config T Interface Serial 0 slash 0. We'll right-click here, notice that, that neighbor has now gone down. If you look over here on the Drachma Router, we'll see interface goodbye received, because that's what happens when you change the configuration in EIGRP. And no matter how long you wait, the neighbor will never come back up because it's now sending this Authentication mode information the Drachma or the Amestris Router is not receiving it. If we go over here to Drachma for example, do Show IP EIGRP neighbors; notice we've only got the one neighbor on Serial 00. Show CDP neighbors, Serial 00 is the Amestris Router. So Xing is completely cut off at this point. We can't get to it through Amestris or Drachma. So let's go over here into Drachma, we'll see our interfaces are serial 00 and 01. So we'll do Config T, Interface Serial 0 slash 0. We will paste in these two commands, do Interface Serial 0 slash 1 same thing here and now you'll notice that this has come up, same thing over here on Xing, we've got a new adjacency come up, because now we're sending the correct Authentication information back and forth. However, now Amestris is no longer talking to Drachma because we're now getting Authentication information from both Xing and Drachma and so if we look at our neighbors table, there's no neighbors for EIGRP process 42 because we're getting bad Hello packets. Well, not really bad hello packets, but authenticated hello packets and we don't have the Authentication set up on our end. If we do Debug EIGRP packets, we'll see EIGRP and we'll do U all just to stop the scrolling, but we'll see EIGRP Serial 00 packet from 10.1.1.1 opt code 5 Authentication off or key chain missing. That's just a really wordy way of saying they have Authentication turned on, I don't recognize that Authentication. So let's configure the Authentication on Amestris and bring our network back up. So we'll do Show CDP Neighbors just to make sure we've got the serial interfaces. I just can't type tonight. Serial 00 and 01, gee consistency is an amazing concept isn't it? So we'll do Config T, Interface Serial 0 slash 0, we'll put that in there. Interface Serial 0 slash 1 put that in there and notice as soon as we do that, we're getting hello packets already, so the adjacency's come up on both ends, Show IP EIGRP Neighbors. Now we have adjacencies up on this end, same thing over here on Drachma. We have two neighbors on Drachma and over on Xing, if we exit Config Mode. Do Show IP EIGRP Neighbors and we now have two neighbors on Xing. So now we have Authentication configured on all three of our routers, we're authenticating using this one keyring and we will continue authenticating it until 9am on Christmas Eve. At which point this will all stop because we don't have any keys set to do the Authentication going forward. Now we either need to change the keyring or turn off Authentication before that time or else the whole network will come crashing down on Christmas Eve morning and, and then everyone will just go home, because well it's Christmas Eve. So that's how you set up Authentication on an EIGRP network. As you can see it's pretty straightforward. Pretty easy to set up. And that concludes our discussion of EIGRP Authentication configuration.
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