Hello,
does your switch have basic layer 3 functionality, and does it support static routes ? If so, you could use multiple static routes for unequal load balancing. The idea is to first create dummy routes for non existing IP addresses, and the use these dummy IP address in the static routes. In the example below, you have two ISPs:
ISP 1 192.168.1.1
ISP 2 192.168.2.1
You would create three static routes for non existing networks, using the ISP next hop addresses. In the example below, ISP 2 gets two static routes, and hence twice as much traffic as ISP 1:
ip route 10.0.1.1 255.255.255.255 192.168.1.1
ip route 10.0.2.1 255.255.255.255 192.168.2.1
ip route 10.0.2.2 255.255.255.255 192.168.2.1
Then, create the matching default routes using the dummy IP addresses as next hop:
ip route 0.0.0.0 0.0.0.0 10.0.1.1
ip route 0.0.0.0 0.0.0.0 10.0.2.1
ip route 0.0.0.0 0.0.0.0 10.0.2.2
