Здравствуйте!Ситуация такая: Имеется роутер Cisco CISCO7606-S (M8500) processor (revision 1.1)
Нужно поднять pppoe сервер.
команда pppoe enable на интерфейсе выдаёт 
router(config)#interface tenGigabitEthernet 2/4
router(config-if)#ppp?
% Unrecognized command
после копания  в доках на cisco.com сделал следующее
конфиги:
!
boot system sup-bootdisk:c7600rsp72043-advipservices-mz.122-33.SRE1.bin
!
aaa authentication login default local
aaa authentication ppp default group radius
aaa authorization exec default local
aaa authorization network default group radius
aaa accounting delay-start
aaa accounting update periodic 1
!
bba-group pppoe global
 virtual-template 1
 vendor-tag circuit-id service
 vendor-tag strip
 sessions max limit 25000
 sessions per-vc limit 8
 sessions per-mac limit 2
 sessions per-vlan limit 4000
 sessions auto cleanup
!
bba-group pppoe testpppoe
 virtual-template 1
 vendor-tag circuit-id service
 vendor-tag strip
 sessions per-vc limit 2
 sessions per-mac limit 3
 sessions auto cleanup
interface TenGigabitEthernet2/4
 no ip address
 no ip redirects
 no ip proxy-arp
 vlan-id dot1q 776
 pppoe enable group testpppoe
  exit-vlan-config
 !
 vlan-id dot1q 777
  pppoe enable group testpppoe
  exit-vlan-config
 !
 vlan-id dot1q 778
  pppoe enable group testpppoe
  exit-vlan-config
interface Virtual-Template1
 description << Template for DSL's PPPoE virtual interfaces >>
 mtu 1492
 ip unnumbered Loopback0
 no ip redirects
 no ip proxy-arp
 ip tcp adjust-mss 1452
 no logging event link-status
 timeout absolute 1440 0
 no peer default ip address
 keepalive 10 10
 ppp quality reject
 ppp authentication pap
 ppp ipcp dns xx.xx.xx.xx xx.xx.xx.xx
 ppp ipcp address required
 ppp ipcp address unique
PPPoE не работает
команда
 #sh interfaces tenGigabitEthernet 2/4 summary  выдаёт  
 *: interface is up
 IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
 OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
 RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
 TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
 TRTL: throttle count
  Interface                  IHQ      IQD      OHQ      OQD     RXBS     RXPS     TXBS     TXPS     TRTL
--------------------------------------------------------------------------------------------------------
*TenGigabitEthernet2/4         0        0        0        0    22000       22        0        0        0
 TenGigabitEthernet2/4.776        -        -        -        -        -        -        -        -        -
NOTE:No separate counters are maintained for subinterfaces
     Hence Details of subinterface are not shown
debug ppppoe молчит