how to route based on link load?

Linux Advanced Routing and Traffic Control

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hello,

i want to know if there is any method to route traffic 
based on the load of a link. 
imagine the following scenario:

 +----------+     +------+        +------+     +----------+
 | subnet 1 |#####| rt 1 |--------| rt 2 |#####| subnet 2 |
 +----------+     +------+        +------+     +----------+
                       \            /
                        \ +------+ /
                         \| rt 3 |/
                          +------+

the bandwidth of the links is as follows:
   sn1 - rt1          100mbit   
   sn2 - rt2          100mbit
   rt1 - rt2 - rt3     10mbit
now there are multiple flows from sn1 to sn2.
if the load on the prefered link (rt1-rt2) is 80% or more
i want to utilisize the rt1-rt3-rt2 route as well. 
but only in this case - not normaly. 
so i think ecmp with weights is not the solution to this.

anyone out there who can point me in the right direction?

thanx in advance 

bye bye birger

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