Frame Relay cloud diagram

altjx

Forgive me for my frustration... But is the topology on the right the same as what Cisco's topology show on the left? Minus the labels?

I get all confused when I see the Cisco topology sometimes. There's S0/0/0 on the side of R1, but at the same time there's a freakin link connecting to R2 and R3, and a link connecting to the middle cloud. That's confusing as hell for me.

I basically drew my own in Packet Tracer and wanted to know if this is the correct understanding. Do those dotted lines represent virtual circuits?

cisco_trooper

A cloud in a drawing generally indicates you don't know what the devices inside the cloud look like. In this drawing there is likely a single frame relay switch inside the cloud that is being used to provide the virtual circuits between the individual routers. The dotted lines do represent virtual circuits.

altjx

cisco_trooper wrote: »

A cloud in a drawing generally indicates you don't know what the devices inside the cloud look like. In this drawing there is likely a single frame relay switch inside the cloud that is being used to provide the virtual circuits between the individual routers. The dotted lines do represent virtual circuits.

Hmm ok. Thanks

advanex1

It looks like you actually have it wrong.

There should be one central cloud that all 3 routers connect to and R1 is the hub with DLCI 102 and 103. What the dotted lines are expressing is the virtual circuits between routers, but they are all only going through one cloud and are in the same subnet from what I can see.

So what you'd actually have is...

R2 S0/0 is DLCI 101 (because they are only locally significant)
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<cloud>

---

R1 would have DLCI 102 going to R2 and DLCI 103 going to R3 through the FR network.
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R3 S0/0 DLCI is 101 for the same reason

I hope that doesn't confuse you.

altjx

advanex1 wrote: »

It looks like you actually have it wrong.

There should be one central cloud that all 3 routers connect to and R1 is the hub with DLCI 102 and 103. What the dotted lines are expressing is the virtual circuits between routers, but they are all only going through one cloud and are in the same subnet from what I can see.

So what you'd actually have is...

R2 S0/0 is DLCI 101 (because they are only locally significant)
|
|
R1

---

<cloud> R1 would have DLCI 102 going to R2 and DLCI 103 going to R3 through the FR network.
|
|
R3 S0/0 DLCI is 101 for the same reason

I hope that doesn't confuse you.

That makes perfect sense actually. I think I finally got it. I took a break. Too much in a day. Thanks man

advanex1

Well, I fixed the "diagram" to show everything going through the cloud. The way I had it formatted originally wasn't showing up correctly...

You should now see all routers going to the cloud and R1 is the HUB.

Glad this helped you.