RE: working vs non-working config / frame-relay

FIG -1 CE1<===> [Service Provider Network]<===>CE2
FIG-2 CE1<=====>CE2

I am trying to find out, how is sub-interface functionally different than the
physical interface

> ===================================
> CE-1 ===================================
>
> interface Serial2/0 no ip address encapsulation frame-relay serial
   restart-delay 0 clock rate 64000 frame-relay intf-type nni!
interface Serial2/0.101 point-to-point ip address 192.168.10.2 255.255.255.0
frame-relay
    interface-dlci 101 !
>
> ===================================
> CE-2 ===================================interface Serial2/0 no ip address
encapsulation frame-relay serial restart-delay 0
 frame-relay intf-type nniend
> CE1#sh running-config interface s2/0.101Building configuration...
> Current configuration : 120 bytes!interface Serial2/0.101 point-to-point ip
address 192.168.10.1 255.255.255.0 frame-relay interface-dlci 101 end
> =================================================== Above is the Working
Config
  Below is the config not working - -- why ?
> ==================================================
>
> ===================================
> CE-1 ===================================
 interface Serial2/0 ip address 192.168.10.2 255.255.255.0 encapsulation
frame-relay serial restart-delay 0 clock rate 64000 frame-relay map ip
192.168.10.2 101 frame-relay interface-dlci 101 frame-relay intf-type dceend
>
>
> ===================================
> CE-2 ===================================
> interface Serial2/0 ip address 192.168.10.1 255.255.255.0 encapsulation
frame-relay serial restart-delay 0 frame-relay map ip 192.168.10.1 101
> frame-relay map ip 192.168.10.2 101 frame-relay interface-dlci 101
>
>
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Received on Thu Jun 09 2011 - 03:19:04 ART