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And welcome back.

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As we continue our journey, we're going to configure this Tier 0 gateway.

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And behind the scenes, it's really the services router function on this Tier 0

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gateway

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that we wanted to go ahead and be a BGP peer with this device out here at .121.

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And the Tier 0 gateway is going to be in a Thomas System 777.

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And the soon-to-be configured external BGP router is going to be in the Thomas

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System 6783

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based on our plan.

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So to configure the details for our BGP configuration on our Tier 0 gateway, we
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So to configure the details for our BGP configuration on our Tier 0 gateway, we

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're going to go

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to the NSX manager right here.

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And we'll click on networking.

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And then because this is going to be associated with our Tier 0 gateway, we're

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going to go

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ahead and click under Connectivity.

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We're going to click on Tier 0 gateways.

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And we have one of them.

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And that is right here.

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So if we expand it currently, if we scroll down, BGP is enabled by default, but

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it has

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all the default configuration.

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So if we want to modify the BGP configuration, we'll go ahead and click on the

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three dots

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for our Tier 0 gateway.

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And we'll click on Edit from the dropdown menu.
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And we'll click on Edit from the dropdown menu.

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So now we can scroll down to the BGP section, expand it, and put the values

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that we want

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here.

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So it is enabled.

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We'll go ahead and leave it enabled.

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And our local AS, our local autonomous system, is going to be 777.

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And for most of the other details here, I'm going to go ahead and leave them at

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their

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default, except we do need to specify who the neighbor or neighbors are going

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to be for

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this Tier 0 gateway.

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So still here in the BGP section, over here where it says BGP neighbors, we'll

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go ahead

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and click on Set.

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So we'll click on Set here.

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Currently there's no BGP neighbors configured.
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Currently there's no BGP neighbors configured.

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So we'll fix that by clicking right here on Add BGP neighbor.

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So the IP address of our BGP neighbor is going to be 192.168.1.121.

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We verified that we could ping that from our services router.

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So we know we have basic connectivity there.

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And then the remote autonomous system number for that soon to be BGP neighbor

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is going to

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be 6783, just like that.

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And then for the source address, we could specify an IP address we want to

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source the

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BGP neighbor ship from on the Tier 0 gateway.
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BGP neighbor ship from on the Tier 0 gateway.

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But if we just leave it blank here, it'll simply use the routing table and use

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whatever

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interface it would use from a routing perspective to connect and build a

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neighbor ship with

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that pair.

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So with BGP, it's not using its own proprietary protocol layer 4.

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It uses TCP and some well-known ports associated with TCP.

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They're associated with border gateway protocol.

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So because they're on the same exact subnet, I don't need to change the maximum

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hop limit.

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So we'll scroll down and I'm going to leave all the other defaults as they are.

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So the other thing I did here for the neighbor was specify the IP address of

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the neighbor
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the neighbor

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and also specify the autonomous system number of the neighbor.

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So I'll scroll down, click right here on Save.

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So another that's configured over here on the right under Status.

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I'm going to click on the refresh and Survey says Success.

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Fantastic.

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Click on Close.

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Then I'll click right here on Save.

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And I'll scroll down and click right here on Close Editing.

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And boom.

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Now we have our BGP neighbor from the perspective of the Tier 0 gateway.

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We now have that neighbor configured.

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And I see over here on the right, I see an alarm.

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So if we click on that and look at the details, visit showing us that we have B
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So if we click on that and look at the details, visit showing us that we have B

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GP down.

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Now why would it be showing down twice?

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Well, it's showing once as BGP being down from Edge 2 and the other one, if we

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look at

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it, I'll betch it's Edge 1.

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And there it is.

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So effectively, both of our Edge nodes are saying, you know what?

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We're trying to form this BGP neighborhood out there to that device at 121, who

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's in

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autonomous system 673, but we're having absolutely no success with it at all.

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And there's a good reason for that, which is we haven't yet configured the

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external device.
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external device.

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So that, my friend, will be our next logical step is to go to this device,

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which in my

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lab topology, that's a Cisco device.

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It's going to be running BGP and let's set it up.

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So when we set it up, we're going to tell it that it should peer with .61,

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which is Edge

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1 and .62, which is Edge 2.

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And as part of our configuration, we'll specify that this BGP speaker is in

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autonomous system

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673 and that the remote autonomous system for .61 and .62 are both in

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autonomous system

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777.

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So I'll see you in the next video as we can figure that external device as an
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So I'll see you in the next video as we can figure that external device as an

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external

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router running BGP.