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Re: Frame-Relay dlci Confusion posted 11/21/2008
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Dear Zeeshan,

First of all, If I disable inverse-arp on R1 and R2, how will I be able to
learn DLCIs dynamically?

Case 1: If the topology is full mesh, means there is a direct connection
(PVC) between R1 and R2, In this case "show frame-relay pvc" will provide
the information of two PVCs (active) on each router.

Case 2:  If R1 can only get to R2 via R3 (Hub) ,then on R1 and R2 , you will
get only one PVC info (towards R3) by "sh fram pvc".

Note: In both cases, you may found "Inactive" PVCs (got from FR switch)
whose mappings (DLCI-IP) are not defined.

HTH


On 11/21/08, ZEESHAN SANAULLAH <zeeshan_dreamcatcher@xxxxxxxxxxx> wrote:
>
> Hello GS !!!!
>
> I am a little confused in this basic thing regarding frame-relay dlci.
>
> Lets take 3 routers R1,R2,R3
>
> R3 is the HUB and R1 and R2 are spokes
>
> The Frame-Relay switch is configured in a full mesh configuration.
>
> But the task asks to configure the routers in Hub and Spoke manner.
>
> R1 , R2 and R3 must have ip 10.1.1.1/24 and 10.1.1.2/24 and 10.1.1.3/24
> respectively.
>
> Disable inverse-arp on R1 and R2 so that they only learn dynamic mapping to
> R3
>
> All config is to be done on Main interfaces.
>
> Now the confusion is that ... when all configs are done correctly.
>
> what must be the output of show frame-relay pvc command.
>
> i mean R1 and R2 must have learned two dlci.
>
> The one to R3 must be active........
>
> what about the other ???? the one between R1 and R2.
>
> What i get in Lab is some times it is unused but active and sometimes used
> and
> active as well.
>
> any idea ??
>
> Regards
> Zeeshan
>
>
>
>
>
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-- 
Fahad Khan
http://fahad-internetworker.blogspot.com