Configuring Dynamic PPPoE over Static PPPoE with ATM Interface Columns

Figure 1 shows dynamic PPPoE subinterface columns and illustrates an alternative method for PPPoE to support multiple IP sessions over each ATM 1483 circuit.

Figure 1: Dynamic PPPoE over Static PPPoE with ATM Interface Columns

To configure an ATM 1483 subinterface to support a dynamic PPPoE subinterface:

1. Configure a physical interface.
   host1(config)#interface atm 5/0
2. Configure an ATM 1483 subinterface.
   host1(config-if)#interface atm 5/0.1
3. Configure a PVC by specifying the virtual circuit descriptor, the virtual path identifier, the virtual channel identifier, and the encapsulation type. For more information, see Creating a PVC on an ATM 1483 Subinterface.
   host1(config-subif)#atm pvc 10 10 22 aal5snap

   If you want the router to autodetect the encapsulation type, use the aal5autoconfig option.

   host1(config-subif)#atm pvc 10 10 22 aal5autoconfig
4. Set the encapsulation type to PPPoE to create the PPPoE major interface.
   host1(config-subif)#encapsulation pppoe
5. Assign a profile.
   host1(config-subif)#pppoe profile pppoeProfile1

   The default encapsulation type, any, applies to any autoconfigured encapsulation that does not have a specific profile assignment.

6. Configure the interface to detect and accept dynamic PPPoE subinterfaces.
   host1(config-subif)#pppoe auto-configure

   When you configure dynamic encapsulation type lockout for PPPoE sessions that contain the IWF-Session DSL Forum VSA (26-254) in the PPPoE active discovery request (PADR) packets, even if PPPoE sessions associated with a particular MAC address are locked out, other PPPoE sessions that originated with the same MAC address are not terminated (continue to remain logged in) if they are IWF sessions from different access loops (PPPoE clients) and this information is available to the B-RAS application.

7. (Optional) Verify your configuration. For more information, see Monitoring Status or Summary Information for ATM Subinterfaces.

   host1#show atm subinterface atm 5/0.1

                                  Circuit                           Interface
   Interface ATM-Prot VCD VPI VCI  Type   Encap MTU      Status       Type
   --------- -------- --- --- --- ------- ----- ---- -------------- ---------
   ATM 5/0.1 RFC-1483  10  10  22 PVC     SNAP  9180 lowerLayerDown Static
   
   Auto configure status         : static
   Auto configure interface(s)   : none
   Detected 1483 encapsulation   : none
   Detected dynamic interface    : none
   Interface types in lockout    : none
   
   Assigned profile (IP)         : none assigned
   Assigned profile (BridgedEnet): none assigned
   Assigned profile (PPP)        : none assigned
   Assigned profile (PPPoE)      : none assigned
   Assigned profile (any)        : none assigned
   
   SNMP trap link-status: disabled
   Assigned VC Class: none assigned
   
   InPackets:                0
   InBytes:                  0
   OutPackets:               0
   OutBytes:                 0
   InErrors:                 0
   OutErrors:                0
   InPacketDiscards:         0
   InPacketsUnknownProtocol: 0
   OutDiscards:              0
   InPolicedPackets:         0
   OutPolicedPackets:        0
   1 interface(s) found

   host1#show pppoe interface atm 5/0.1

   PPPoE interface ATM 5/0.1 is operStatusLowerLayerDown
       PPPoE interface ATM 5/0.1 has max sessions = 8000
       PPPoE interface ATM 5/0.1 MTU 1494
       PPPoE interface ATM 5/0.1 has no acName set
       PPPoE interface ATM 5/0.1 autoconfigured subinterfaces
       PPPoE interface ATM 5/0.1 has 0 active connections,
           out of 0 configured subinterfaces
   Assigned profile (any)        : pppoeProfile1
   
   PPPoE Statistics
     Counters:
       PADI received       0
       PADI transmitted    0
       PADO received       0
       PADO transmitted    0
       PADR received       0
       PADR transmitted    0
       PADS received       0
       PADS transmitted    0
       PADT received       0
       PADT transmitted    0
       PADM received       0
       PADM transmitted    0
       PADN received       0
       PADN transmitted    0
     PAD packets received        0
     PAD packets transmitted     0
   
     Invalid PAD Packets:
       Invalid Version           0
       Invalid PAD Code          0
       Invalid PAD Tags          0
       Invalid PAD Tag length    0
       Invalid PAD Type          0
       Invalid PADI Session      0
       Invalid PADR Session      0
       Invalid PAD packet length 0
       Invalid PAD packets       0
      Total Invalid PAD packets  0
      Ingress Policed Packets 0
      Egress Policed Packets 0
   
     Insufficient Resources 0