Hi John,
If the hub had 1024 kbps then it would provision 102.4 kbps for each PVC. EIGRP can use up to 50% of that so that’s 51.2 kbps.
The spokes only have 64 kbps, 50% of that is 32 kbps. I would use the IP bandwidth-percent eigrp command so that the hub also uses no more than 32 kbps for EIGRP.
32 / 102.4 * 100 = about 31% so that’s what I could configure on the hub.
If the bandwidth of the hub is 640 kbps then it will provision 64 kbps for each spoke. There’s no need to use the ip bandwidth-percent eigrp command now.
Don’t forget to use the “regular” bandwidth command though, normally a serial interface is seen as a T1 interface which is 1.544 Mbit.
Rene