10-06-2008 04:40 AM - edited 03-06-2019 01:46 AM
Hi all, can anyone tell me how ospf works out the best cost to a destination? what metrics does it use? If I have say 2 circuits to the same destination, 1 has 10 routers, all with 2 meg lines, the other router uses 3 routers to get there but with the same 2 meg bandwidth between them, would it load balance these circuits ?
10-06-2008 05:38 AM
Hello Carl,
the answer is no.
OSPF cost is calculates on each link on the path to destination as:
10^8 /Interface bandwidth in bps
10^8/2000000 = 50
the cumulate cost is the sum of all link costs to the destination:
path 1 : 10*50 + cost of lan interface
path2 : 3*50 + cost of lan interface
only path2 will be used because it is the shortest path to destination
Hope to help
Giuseppe
10-06-2008 06:18 AM
ok, would it be possible to load balance these ?
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