Alternative Configuration

In previous releases, you could configure a PPPoE major interface directly over ATM 1483 only. The router still supports this stacking and configuration method for PPPoE. Although the older and newer interface stacks are different, they behave the same in terms of frame encapsulation and handling. As a result, an interface created using the older stacking will interoperate with an interface using the new stacking. Note, however, that the previous command syntax (encapsulation pppoe) cannot be used when a bridged Ethernet interface already exists, because it is intended to produce the old stacking for PPPoE over ATM 1483.

1. Create the ATM 1483 subinterface and associated PVC:

   host1(config)#interface atm 9/1.1 point-to-point

   host1(config-subif)#atm pvc 1 0 32 aal5snap 0 0 0

2. Create a PPPoE major interface over the ATM 1483 subinterface. Note that since this command uses the encapsulation keyword, it will fail if a bridged Ethernet interface was already created over the ATM 1483 subinterface using the new syntax.

   host1(config-subif)#encapsulation pppoe

3. Create a PPPoE subinterface over the major interface. Because PPPoE is the only top layer protocol in the stack, there is no need to use pppoe to identify the subinterface type (it is implied).

   host1(config)#interface atm 9/1.1.1

4. Configure the PPP encapsulation over the PPPoE subinterface, and the IP interface over the PPP interface.

   host1(config-subif)#encapsulation ppp

   host1(config-subif)#ip address 160.1.1.1 255.255.255.0

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