the answer is very simple. The dlci 19 in your case has only local significance. As you know if there are two routers in a frame-relay cloud and a pvc exist between them, then each end of the pvc (each router ) should be having a unique dlci.
In your case the central site is like a hub and the remote sites are like spokes. There for pvcs exists only from spoke to hub. In your case, there is no pvc existing from one spoke to another. So all the remote sites can use the same dlci number. For every remote site (say N, where N is any number), there will be N pvcs, each pvc from hub to the spoke, and the hub will have a unique dlci number for each pvc. While the spokes can use the same dlci number, as the pvc exists only from spoke to hub
Consider this example....
1 hub site and 3 remote sites.
we need 3 pvcs for a hub and spoke topology.
at the hub, we configure 3 dlcis say 100, 200, 300. At each of the remote sites we configure the dlci number 400 (all the 3 sites use the same dlci).
Now, the 3 pvcs are defined as follows. 100 - 400, 200-400 and 300-400.
Eventhough all 3 sites uses the same dlci number, they all belong to different pvcs. Also you should note that, routing protocols help in communication between one spoke to another spoke. Communication between spokes, happen only through the hub site.
Its just an analogy used to explain the particular frame-relay topology.
Assume a central site and 10 remote sites. Each remote site has one pvc to the central site.
So if you draw a diagram of the topology, with the central site at the centre and the remote sites around it, there would be one line drawn from each remote site to the central site, indicating each pvc. This would look like the wheel of a bicycle with hub cap at the center and spokes going outwards from the hub.
In the example, the central site is denoted as "HUB" and the remote site is denoted as "SPOKE".
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
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I couldn't connect to the hos...