Explanation/Reference:
Explanation:
Enabling PPPoE in a VPDN Group
Perform this task to enable PPPoE in a virtual private dial-up network (VPDN) group.
Restrictions
This task applies only to releases prior to Cisco IOS Release 12.2(13)T.
SUMMARY STEPS
1. enable
2. configure terminal
3. vpdn enable
4. vpdn-group name
5. request-dialin
6. protocol pppoe
DETAILED STEPS

Reference: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t2/feature/guide/ ftpppoec_support_TSD_Island_of_Content_Chapter.html