Hello
You could possibly tweak the solution suggested by Balaji a little if you desire..
On the NAT rtr - Have the primary default route towards the primary ISP-colt as a conditional default route tracked with ipsla with a low administrative distance and the secondary default route set with a higher admin distance than the primary, this will then by default route all traffic towards that ISP however it will allow you then just to policy base route any specific traffic towards ISP2 from only a single lan sub-interface plus you will have no requirement of any EEM scripting.
no event manager applet COLT_DOWN
no ip sla 20
ip route 0.0.0.0 0.0.0.0 <interface> 172.16.10.1 1 track 1 name ispcolt
ip route 0.0.0.0 0.0.0.0 <interface> 172.16.20.1 10 name ispbt
interface Ethernet0/0.1
no ip policy route-map COLT_PBR
Note: Policy based routing can become asymmetric meaning even if you policy route egress towards an different external path your return traffic may not route back the same way it exited.
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Kind Regards
Paul
