EIGRP Configuration for CCNA Students

Hello Everyone,

I have configured 2 Routers with 4 parallel links. Each router has a loopback address. I have advertised loopback addresses of the loopbacks in EIGRP. The FD is equal on all the links. I see 4 paths in the routing table of each router for a given loopback address. According to my understanding there should be load balancing between all the 4 links. But I see load balancing between only 2 links. All 4 are not participating in the load balancing.

I have captured the packets on all the 4 links. I see packets are transferred through only 2 links. I am using ping to send the traffic.

Configuration on R1:

router eigrp 1
 maximum-paths 6
 network 1.1.1.1 0.0.0.0
 network 100.10.10.0 0.0.0.255
 network 100.10.20.0 0.0.0.255
 network 100.20.10.0 0.0.0.255
 network 100.100.100.0 0.0.0.255

Configuration on R2.

router eigrp 1
 maximum-paths 6
 network 2.2.2.2 0.0.0.0
 network 100.10.10.0 0.0.0.255
 network 100.10.20.0 0.0.0.255
 network 100.20.10.0 0.0.0.255
 network 100.100.100.0 0.0.0.255

Thanks,
Sachin