EIGRP not using fastest route

[ppolando]

I have a network with 5 sites. Each site has a metro ethernet connection to two providers. Here is my set up:

2821

Gig0/1

Connected to Provider A at 100Mbps full duplex and they provisioned circuit at 100Mbps

FA0/3/0 (1-port 10/100 HWIC)

Connected to Provider B at 100Mbps full duplex and they provisioned circuit at 20Mbps

interface GigabitEthernet0/1
description Consolidated Communications 100Mbps Metro E.
ip address 10.20.20.13 255.255.255.0
load-interval 30
duplex full
speed 100
appletalk cable-range 1010-1010 1010.243
appletalk zone WAN

!

interface FastEthernet0/3/0
description Comcast 20Mbps Metro E.
ip address 10.10.10.8 255.255.255.0
load-interval 30
duplex full
speed 100

!

router eigrp 1
redistribute connected
network 10.10.10.0 0.0.0.255
network 10.20.20.0 0.0.0.255
auto-summary

My router will only use the connection with Provider B. Provider B is supposed to be used only as a backup if Provider A goes down.  EIGRP works if  I pull the cable from Provider B, it will fail-over to A. I'm not an expert by any means with EIGRP, any ideas would be greatly appreciated!

[chrihussey]

Providing the 2821 router config might make it easier to resolve.

That aside, the G0/1 and F0/3/0 interfaces are operating at 100mbs, so the bandwidth is the same. If you configure "bandwidth 20000" (which is 20Mb) under the F0/3/0 interface you may get your desired results.

Other that that, adjusting the delay metric for each interface should fix the issue.