Hi Al

attached are two diagrams showing my problem.
Both diagrams show 4 X routers.
One diagram shows 6 X physical interconnections, which is allowing any of the 4 routers, to have a physical path to a neighbour.
The other diagram associates the 6 X physical interconnections with cabling infrastructure, Cable A Cable B and Cable C.
When I peruse the diagram without the Cabling information, I get a warm and fuzzy feeling that the routed network is robustly designed to withstand a solitary break to any interconnection. ( Cisco routing tables will deploy traffic around a break).
However, when I look at the diagram with the Cabling information, I see a different story.
If "farmer Brown" digs up Cable B all 6 physical interconnections pop!, and as a consequence all 4 routers will be isolated from each other.
I know Cisco works produce a product that can diagram the networks routed neighbours, but I dont think it caters for cabling infrastructure along the interconnections.

Ostensibly, when I say a predictive tool, I am not refering to the ability to capture and process historical data on errored links. I was imagining a model of cabling infrastructure which would encompass the ability to identify the devices that are connected to the fibres within each cable.
(
I have seen cabling models but they dont go so far as to include routing devices)
Without such a predictive tool, my next best option would be a Gypsy's crystal ball.

cheers
cliff