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Site link costing

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trevorh13

Instructor
Sep 18, 2000
132
GB
Can anyone please explain to me how site costing work? Lets say you have two sites; two site links are configured. Link A represents a 512K kilostream with a costing of 50 while Link B represents an ISDN backup line with the costing set at 100.

Presumably the system would choose to replicate via the kilostream line because the cost is cheaper? The question is then how does it know that Link A is for the Leased Line and Link B is for the ISDN line?

I have looked through endless books and online resources including Microsoft White Papers. A number of MCSE colleagues are unable to answer the question as well and have advised simply to know the theory for the example and not worry about practical implimentation. I would like to understand how this feature works because at the moment I cannot possibly conceive how it could.

Any help would be very much appreciated.
 
It doesn't know and doesn't care. All any system cares about is the link cost or "metric". IF you switch the link costs around and make the ISDN cheaper then the system will route through that - not to be recommended.
 
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