Frame-Relay Hub and Spoke DLCI

I've read through Frame-Relay lectures and working on labs now in GNS3. In Cisco Press they say if the Hub has a DLCI by each PVC then its Local and if it has one DLCI by the hub then its Global. The problem I'm facing is setting it up with Global addressing in GNS3. The frame-relay switch won't allow me to put the same DLCI on one port twice. Hope I'm saying this correctly.I know how to configure the routers. Its just the configuration of the relay switch thats giving me a problem. Anyone can help me with this?

R1(DLCI 51)

R2(DLCI 52)

R1(DLCI 51)

R3(DLCI 53)

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Comments

martell1000

so you are trying to assign DLCI51 to go to DLCI52 and to DLCI53?

that wont work because you have to set unique DLCI numbers on the hub per connection...

what is possible would be that:

R1(DLCI 51)

R2(DLCI 51)

R1(DLCI 52)

R3(DLCI 51)

alxx

a good lab or few on frame relay is Free CCNA Workbook » Section 5

and they aren't many people using their free lab(3 reservations in the next 14 days)

mallyg27

martell1000 wrote: »

so you are trying to assign DLCI51 to go to DLCI52 and to DLCI53?

that wont work because you have to set unique DLCI numbers on the hub per connection...

what is possible would be that:

R1(DLCI 51)
R2(DLCI 51)

R1(DLCI 52)
R3(DLCI 51)

I agree with you, but how come in the cisco press book they dont use that in the following diagram.They only have one DLCI on the link from the hub.

IMAG0219.jpg

mgeorge

Alxx, I've disabled the lab access for the next week as I'm upgrading the lab from 2600XM's to 3725's.

martell1000

mallyg27 wrote: »

I agree with you, but how come in the cisco press book they dont use that in the following diagram.They only have one DLCI on the link from the hub.

now i get what you mean!

here is a nice explanation about local and global DLCIs:

FR Answer III: Global DLCIs | Wendell's CCNA Skills Blog

in fact there are no global DLCIs, you just make the traffic on each spoke leave on the same DLCI and assign that dlci as a global dlci on the hub...

so traffic leaving R1 still leaves thru different (local) DLCIs when you have more than one connection in your frame relay network.

martell1000

in fact it would look like that:

R1(DLCI 52)

R2(DLCI 51)

R1(DLCI 53)

R3(DLCI 51)

Global DLCI of R1 is 51
Global DLCI of R2 is 52
Global DLCI of R3 is 53

alxx

mgeorge wrote: »

Alxx, I've disabled the lab access for the next week as I'm upgrading the lab from 2600XM's to 3725's.

Nice. Planning on using it a bit more from work (when get spare time).
Just got my 3745 up and running at home - rather noisy.

blackninja

mgeorge wrote: »

Alxx, I've disabled the lab access for the next week as I'm upgrading the lab from 2600XM's to 3725's.

Hey Matthew. I'm glad you're still doing the free lab thing. Did that programmer I set you up with sort the booking part of your site? I hope so.

I had to quit helping out with Cisco NetAcad as the politics was just getting ridiculous & got sick of the same crap.

Anyway, best of luck with your site

Rgds
Paul

mallyg27

martell1000 wrote: »

in fact it would look like that:

R1(DLCI 52)
R2(DLCI 51)

R1(DLCI 53)
R3(DLCI 51)

Global DLCI of R1 is 51
Global DLCI of R2 is 52
Global DLCI of R3 is 53

Thanks. I understand it completely now.

mgeorge

blackninja wrote: »

Hey Matthew. I'm glad you're still doing the free lab thing. Did that programmer I set you up with sort the booking part of your site? I hope so.

I had to quit helping out with Cisco NetAcad as the politics was just getting ridiculous & got sick of the same crap.

Anyway, best of luck with your site

Rgds
Paul

Yeah that programmer did a fantastic job of coding the schedule portal. Still in the process of making a few fixes but all is working out great.

Politics and rediculous always goes hand in hand...