Facts to remember about WAN technologies

PPPoE

Verification commands: show ppp all, show pppoe session

Configure a PPPoE connection between CPE (Client) and ISP.(server)

• Configure a Broadband Aggregation (BBA) group which will handle incoming PPPoE connection attempts and the pool of addresses (don't include virtual template ip)

          ISP(config)# bba-group pppoe MyGroup

          ISP(config-bba-group)# virtual-template 1
          ISP(config)# ip local pool MyPool 10.1.13.4 10.1.13.254

• Create the virtual interface to represent the point-to-point connection and link the pool of addresses

           ISP(config)# interface virtual-template 1
           ISP(config-if)# ip address 100.1.13.3 255.255.255.0
           ISP(config-if)# peer default ip address pool MyPool

• Enable our PPPoE group on the interface facing the customer network

           ISP(config)# interface f0/0
           ISP(config-if)# no ip address
           ISP(config-if)# pppoe enable group MyGroup
           ISP(config-if)# no shutdown

• On the client side create a dialer interface and tie it to the physical interface which provides the transport. The PPP header adds 8 bytes of overhead to each frame. Assuming the default Ethernet MTU of 1500 bytes, we'll want to lower our MTU on the dialer interface to 1492 to avoid unnecessary fragmentation.

           CPE(config)# interface dialer1
           CPE(config-if)# dialer pool 1
           CPE(config-if)# encapsulation ppp
           CPE(config-if)# ip address negotiated
           CPE(config-if)# mtu 1492

           CPE(config)# interface f0/0
           CPE(config-if)# no ip address
           CPE(config-if)# pppoe-client dial-pool-number 1
           CPE(config-if)# no shutdown


PPPoE Authentication

• Configure PPP CHAP authentication over the PPPoE session between R1 and R3.
• The routers should use their hostname and a password of RSv5 to authenticate each other.

R1:
username R3 password RSv5
!
interface Dialer13
 ppp authentication chap


R3:
username R1 password RSv5
!
interface Virtual-Template13
 ppp authentication chap