Inequality using lengths of the edges of a triangle

Question

If $a,b,c $ are the lengths of the edges of a triangle, show that:

$$\frac {6 (a^2+b^2+c^2)}{a+b+c}\geq \frac {(a+b)^2}{b+c}+\frac {(b+c)^2}{a+c}+\frac {(c+a)^2}{a+b} $$

I have no idea how to start.