Shared risk resource group

There are three main shared risk groups: Failure recovery is a crucial in all types of networks.

SRLGs typically deal with links between fiber optic nodes, but that is not always the case.

SRG modeling is also used when a provider generates a service-level agreement with a client with various protection schemes.

In practice, these cables are bundled on one concrete conduit or power/telephone pole (aerial), which creates a shared risk link group.

If, for example, if there is a cut on a fiber span, it takes down all circuits (upper layer logical links) that use that particular SRLG.

When routing over SNRG is not possible, circuit-pack diversity with-in the same node can lessen the risk of failure.

[6][8][9] There has been recent studies that have proved that the SRG diverse routing is in fact NP-complete.

[10] There is currently no known discrete method to solve this real world problem for large-scale network.

[11] (SRLG is solvable using Suurballe's algorithm) There has been many attempts to overcome the fact that there is no solution for the SRG diverse routing problem.

There may be instances when, due to topological restrictions, unavoidable traps could be introduced that prevent the algorithm from finding a solution.

This method is limited, the following conditions must be met to calculate two SRG diverse paths: This approach works only in very narrow circumstances.

[9] Modern network providers have various ways to deal with shared risk group diverse routing.

Active components are those that can be monitored, and they include: amplifiers, transponders, regenerators, and DWDM Mux/DeMuxs.

Passive components cannot be monitored electronically, and include conduits, simple patch-panels, and splice points.