Diagram

7600-----FE VLAN(dot1q)-----7200VXR----atm----(ATM cloud)------frame relay------2811
  |<------------------point to point ip subnet(/30)----------------------------->|




Ex. Configure

<-------------- 7600 ---------------->
interface FastEthernet0/0.1742
 encapsulation dot1Q 1742
 ip address 172.23.114.25 255.255.255.252
<------------------------------------>

<-------------- 7200 ---------------->
 interface FastEthernet0/1.1742
 encapsulation dot1Q 1742
 no ip directed-broadcast
 !
 interface ATM2/0
 bandwidth 155000
 no ip address
 no ip directed-broadcast
 ip route-cache flow input
 no ip route-cache cef
 atm sonet stm-1
 atm uni-version 3.0
 no atm enable-ilmi-trap
 no atm ilmi-keepalive
!
interface ATM2/0.1 point-to-point
 no ip directed-broadcast
 no atm enable-ilmi-trap
 pvc 1/101 l2transport
  cbr 64
  encapsulation aal5snap
!
connect atm-ethv1742 ATM2/0 1/101 FastEthernet0/1.1742 interworking ethernet
 
+- Verify -+
Router#show ip interface brief 
Interface              IP-Address      OK? Method Status                Protocol
FastEthernet0/1        unassigned      YES manual up                    up      
FastEthernet0/1.1742   unassigned      YES unset  up                    up 
ATM2/0                 unassigned      YES manual up                    up      
ATM2/0.1               unassigned      YES unset  up                    up 

System image file is "disk0:c7200-p-mz.120-33.S.bin"

Router#show atm pvc
               VCD /                                    Peak  Avg/Min Burst
Interface      Name         VPI   VCI Type    Encaps    Kbps   Kbps   Cells Sts
2/0.1          1              1   101 PVC     SNAP         64               UP  

Router#show connection 

ID   Name            Segment 1              Segment 2                  State     Description
============================================================================================
76   atm-ethv1742    AT2/0.1 AAL5 1/101     Fa0/1.1742                 UP
<------------------------------------>

<-------------- 2811 ---------------->
interface Serial0/0.1 point-to-point
 ip address 172.23.114.26 255.255.255.252
 no arp frame-relay
 frame-relay interface-dlci 100 
<------------------------------------>

Ping Test Connection in each hop is between :
1) 7600(.25)-----FE VLAN(dot1q)-----(.26)7200VXR	is pass
2) 7200VXR(.25)----atm----(ATM cloud)------frame relay------(.26)2811	is pass
3) 7600(.25)-----FE VLAN(dot1q)-----7200VXR----atm----(ATM cloud)------frame relay------(.26)2811
Test Result : I'm trying to ping from 7600 to 2811,it can't work.