By default, VLAN interfaces have a delay of 100 usec's.
Now, we need to find the metric for each interface. I am assuming you're not going to change k values. Metric = 256(10^7/bandwidth) + 256(delay). So, you should get the following metrics...
Vlan 5 = 256(10^7/4000) + 256(100) = 665600
Vlan 6 = 256(10^7/3000) + 256(100) = 878848
Vlan 7 = 256(10^7/8000) + 256(100) = 345600
As parallel links, all routes here would be considered Feasible Successors. The Feasible distance would be 345600 (plus whatever on other side of links). Needless to say, it is pretty likely that a variance of 2 would allow all three links to be added to the routing table. So, the total configs necessary should be...
conf t
! FIRST, YOU MUST CODE BW ON ALL INTERFACES CORRECTLY
int vl5
bandwidth 4000
int vl6
bandwidth 3000
int vl7
bandwidth 8000
exit
!
router eigrp
network
traffic-share balanced
variance 2
maximum-paths 3
end
wr
Now, in the routing table, you should see all three routes to Site B (I am assuming you made a typo in the original post that says 8Mb goes to C).
Here is a good Cisco Page on this: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009437d.shtml
HTH,
Ryan
