06-06-2008 11:03 PM - edited 03-03-2019 10:16 PM
Hi
i am trying to set up a frame relay hub and spoke topology in my home lab
i have two 2600 routers with wic-1t cards and a one 2520 frame relay router
My question how do i connect them physically back to back with a db60
dce/dte cable to make a hub and spoke network
should it be one physical connection with db60 cable from 2520 router which acts as a hub to the one 2620 router or two physical connection from 2520 to the the two 2620 routers
please advice
Thanks
Solved! Go to Solution.
06-07-2008 11:40 PM
Hi,
When I think of a hub-and-spoke topology in the lab, I usually think of four routers rather than three. One of the "routers" - the 2520 - would act as a frame-relay switch, not as a router. Let us call that box "FRS".
Let us call the other three routers R1, R2, and R3. You could connect R1 to FRS-S0, R2 to FRS-S1, and R3 to FRS-S2. You do this with three DB60 back-to-back cables, with the DCE ends on FRS, and the DTE ends on your routers.
Now decide which router is the hub, say R1. Make two frame-relay PVCs: one R1<-->R2, and one R1<-->R3. There you have a hub-and-spoke topology with R1 as the hub.
You could, I suppose, eliminate the frame-relay switch by configuring the links back-to-back, but that is not the usual way to set it up in the lab - nor in real life. I suspect you would then be spending more time trying to get the back-to-back connections working than studying hub-and-spoke. And in any case, if you are using this to study for an exam I fear it might too different from the standard topology, and might cause confusion.
If I were you I would try and get a third 2620.
Kevin Dorrell
Luxembourg
06-07-2008 04:04 AM
Please see:
http://www.internetworkexpert.com/resources/backtoback-framerelay.htm
HTH,
__
Edison.
Please rate helpful posts
06-07-2008 08:33 AM
I recently set up a home lab using the following config
Hub Router --> Csco 3620
Spoke(1)--> Csco 3620
Spoke(2)--> Csco 3620
Frame Relay Switch -->Csco 2514
I basically set up the following env.
Hub-(2)Spoke setup
where rtr1--> Hub rqan ptomp
and teo spokes ran physical interfaces back to Hub
In this scenario remember the following confiuratiion
1)In Physiclal or PtoMPFrame-Relay connections when inverse-arp is not an option you need to use the Frame-Relay map command Ex
Frame-Relay map ip
In PtoP environments you use the Frame-relay dlci command (See Below)
Frame-relay interface dlci
I connected the DCE end to the Frame-Relay switch, and the DTE to each Frame router.
To verify the connection issue the following cmd (See Below)
sh controllers serial
The third line down or so will show you your connection and clock rate
Remember on DCE connection Frame-Relay i used the following configalong with other Frame-Relay configuration (See Below)
config t
Frsme-relay intf-type DCE
clock rate 64000.HTH
06-07-2008 04:57 PM
Hi
thanks for your help
what i have in my lab is a one 2520 router and 2 2620 router
what i am asking is how many back to back dte/dce connection from the serial int of the the 2520 router do i need to connect to the two 2620 routers to make a frame relay enviroment
Is it s0 of 2520 connects to the s0/0 of 2620 thru serial cable and also s1 of 2520 connects physically to the s0/0 of the second 2620 router
Or we need just need one physical connection fron 2520 to the any 2620 router
please help
06-07-2008 05:15 PM
Is it s0 of 2520 connects to the s0/0 of 2620 thru serial cable and also s1 of 2520 connects physically to the s0/0 of the second 2620 router
That should cover it.
__
Edison.
06-07-2008 11:40 PM
Hi,
When I think of a hub-and-spoke topology in the lab, I usually think of four routers rather than three. One of the "routers" - the 2520 - would act as a frame-relay switch, not as a router. Let us call that box "FRS".
Let us call the other three routers R1, R2, and R3. You could connect R1 to FRS-S0, R2 to FRS-S1, and R3 to FRS-S2. You do this with three DB60 back-to-back cables, with the DCE ends on FRS, and the DTE ends on your routers.
Now decide which router is the hub, say R1. Make two frame-relay PVCs: one R1<-->R2, and one R1<-->R3. There you have a hub-and-spoke topology with R1 as the hub.
You could, I suppose, eliminate the frame-relay switch by configuring the links back-to-back, but that is not the usual way to set it up in the lab - nor in real life. I suspect you would then be spending more time trying to get the back-to-back connections working than studying hub-and-spoke. And in any case, if you are using this to study for an exam I fear it might too different from the standard topology, and might cause confusion.
If I were you I would try and get a third 2620.
Kevin Dorrell
Luxembourg
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