GNS3 lab router on-a-stick

GNS3 lab router on-a-stick:

Curiously, R1 shows all CDP neighbors; the spoke routers do not show any CDP neighbor.  Debugging CDP on R1shows CDP being sent and recieved out sub-interfaces.  Debugging CDP on spoke router R2 shows CDP sends but no CDP receives.

----- Hub router R1 ---------
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet0/0.2
 encapsulation dot1Q 2
 ip address 10.0.2.1 255.255.255.0
!
interface FastEthernet0/0.3
 encapsulation dot1Q 3
 ip address 10.0.3.1 255.255.255.0
!
interface FastEthernet0/0.4
 encapsulation dot1Q 4
 ip address 10.0.4.1 255.255.255.0
!
interface FastEthernet0/0.5
 encapsulation dot1Q 5
 ip address 10.0.5.1 255.255.255.0
!


----- Spoke router R2 ------------
!
interface FastEthernet0/0
 ip address 10.0.2.2 255.255.255.0
 duplex auto
 speed auto
!
ip classless
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0

Cheers,
                   Nocleader