Hi,
I have 2 isp and I'm doing ecmp with 2 gateways in single route with check gateway. Upload is balanced fine but when one of the link fails that gateway still shows reachable in routes. It should show unreachable. So my traffic keeps on going on the down isp . Tried check gateway with ping and arp but without any resolution. I'm using ccr 1016 with 6.17version.

you should use of this config sample :

http://wiki.mikrotik.com/wiki/ECMP_Failover_Script

and you can test another LB method :

http://wiki.mikrotik.com/wiki/Load_Balancing

is it normal that if one of the gateway is unreachable still it shows reachable. Then what is the use of check gateway parameter ?