Basic GLBP with weighted load balancing:
Router A (higher weight):
interface GigabitEthernet0/0 ip address 10.0.0.2 255.255.255.0 glbp 1 ip 10.0.0.1 glbp 1 priority 110 glbp 1 preempt glbp 1 load-balancing weighted glbp 1 weighting 100
Router B:
interface GigabitEthernet0/0 ip address 10.0.0.3 255.255.255.0 glbp 1 ip 10.0.0.1 glbp 1 load-balancing weighted glbp 1 weighting 50
Router A gets twice the traffic as Router B.