PPP over Ethernet Client

The PPP over Ethernet Client feature provides PPP over Ethernet (PPPoE) client support on routers.

PPPoE is a commonly used application in the deployment of digital subscriber lines (DSLs). The PPP over Ethernet Client feature expands PPPoE functionality by providing support for PPPoE on the client and the server.

Finding Feature Information

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Prerequisites for PPP over Ethernet Client

PPP connections must be established between two endpoints over a serial link.

Restrictions for PPP over Ethernet Client

The PPPoE client does not support the following:

  • More than ten clients per customer premises equipment (CPE)

  • Quality of service (QoS) transmission with queueing on the dialer interface

  • Dial-on-demand

  • Easy VPN

  • Native IPv6

  • PPPoE client over ATM permanent virtual circuit (PVC)

  • Coexistence of the PPPoE client and server on the same device

  • Multilink PPP (MLP) on dialer interfaces

  • Nonstop forwarding (NSF) with stateful switchover (SSO)

Information About PPP over Ethernet Client

PPP over Ethernet Client Network Topology

The PPPoE Client feature provides PPPoE client support on routers at customer premises. Before the introduction of this feature, Cisco IOS XE software supported PPPoE only on the access server side. The figure below shows Dynamic Multipoint VPN (DMVPN) access to multiple hosts from the same PPPoE client using a common dialer interface and shared IPsec.

Figure 1. DMVPN Access to Multiple Hosts from the Same PPPoE Client

PPP over Ethernet Client Session Initiation

A PPPoE session is initiated by the PPPoE client. If the session has a timeout or is disconnected, the PPPoE client will immediately attempt to reestablish the session.

The following steps describe the exchange of packets that occurs when a PPPoE client initiates a PPPoE session:

  1. The client broadcasts a PPPoE active discovery initiation (PADI) packet.

  2. When the access concentrator receives a PADI packet that it can serve, it replies by sending a PPPoE active discovery offer (PADO) packet to the client.

  3. Because the PADI packet was broadcast, the host may receive more than one PADO packet. The host looks through the PADO packets it receives and chooses one. The choice can be based on the access concentrator name or on the services offered. The host then sends a single PPPoE active discovery request (PADR) packet to the access concentrator that it has chosen.

  4. The access concentrator responds to the PADR packet by sending a PPPoE active discovery session-confirmation (PADS) packet. At this point, a virtual access interface is created that will then negotiate PPP and the PPPoE session will run on this virtual access.

If a client does not receive a PADO packet for a PADI packet already received, the client sends out a PADI packet at predetermined intervals. That interval length is doubled for every successive PADI packet that does not evoke a response, until the interval reaches the configured maximum.

If PPP negotiation fails or the PPP line protocol is brought down for any reason, the PPPoE session and the virtual access will be brought down and the client will wait for a predetermined number of seconds before trying to establish another PPPoE session.

How to Configure PPP over Ethernet Client

Configuring a PPPoE Client

SUMMARY STEPS

    1.    enable

    2.    configure terminal

    3.    interface type number

    4.    no ip address

    5.    pppoe enable group global

    6.    pppoe-client dial-pool-number number

    7.    no shutdown

    8.    exit

    9.    interface dialer number

    10.    dialer pool number

    11.    encapsulation type

    12.    ipv6 enable

    13.    Do one of the following:

    • ip address negotiated
    • ipv6 address autoconfig
    • ipv6 dhcp client pd prefix-name

    14.    mtu size

    15.    ppp authentication pap callin

    16.    ppp pap sent-username username password password

    17.    end


DETAILED STEPS
     Command or ActionPurpose
    Step 1 enable


    Example:
    Device> enable
     

    Enables privileged EXEC mode.

    • Enter your password if prompted.

     
    Step 2configure terminal


    Example:
    Device# configure terminal
     

    Enters global configuration mode.

     
    Step 3interface type number


    Example:
    Device(config)# interface GigabitEthernet 0/0/0
     

    Configures an interface and enters interface configuration mode.

     
    Step 4no ip address


    Example:
    Device(config-if)# no ip address
     

    Removes the IP address.

     
    Step 5pppoe enable group global


    Example:
    Device(config-if)# pppoe enable group global
     

    Enables a PPPoE session on the Gigabit Ethernet interface.

     
    Step 6pppoe-client dial-pool-number number


    Example:
    Device(config-if)# pppoe-client dial-pool-number 1
     

    Configures a PPPoE client and specifies dial-on-demand routing (DDR) functionality.

     
    Step 7no shutdown


    Example:
    Device(config-if)# no shutdown
     

    Removes the IP address.

     
    Step 8exit


    Example:
    Device(config-if)# exit
     

    Exits interface configuration mode and returns to global configuration mode.

     
    Step 9interface dialer number


    Example:
    Device(config)# interface dialer 1
     

    Defines a dialer rotary group and enters interface configuration mode.

     
    Step 10dialer pool number


    Example:
    Device(config-if)# dialer pool 1
     

    Specifies the dialing pool that the dialer interface uses to connect to a specific destination subnetwork.

     
    Step 11encapsulation type


    Example:
    Device(config-if)# encapsulation ppp
     

    Specifies the encapsulation type.

    • Sets PPP as the encapsulation type.

     
    Step 12ipv6 enable


    Example:
    Device(config-if)# ipv6 enable
     

    Enables IPv6 on the dialer interface.

     
    Step 13Do one of the following:
    • ip address negotiated
    • ipv6 address autoconfig
    • ipv6 dhcp client pd prefix-name


    Example:For IPv4
    Device(config-if)# ip address negotiated


    Example:For IPv6
    Device(config-if)# ipv6 address autoconfig


    Example:For DHCP IPv6
    Device(config-if)# ipv6 dhcp client pd pd1
     

    Specifies how the IP address is obtained for the dialer interface. This can be through one of the following as specified:

    • PPP/IP Control Protocol (IPCP) address negotiation

    • Dynamic Host Configuration Protocol (DHCP)

     
    Step 14mtu size


    Example:
    Device(config-if)# mtu 1492
     

    Sets the maximum transmission unit (MTU) size.

     
    Step 15ppp authentication pap callin


    Example:
    Device(config-if)# ppp authentication pap callin
     

    Enables at least one PPP authentication protocol and specifies the order in which protocols are selected on the interface.

     
    Step 16ppp pap sent-username username password password


    Example:
    Device(config-if)# ppp pap sent-username username1 password password1
     

    Reenables remote Password Authentication Protocol (PAP) support for an interface and reuses the username and password parameters in the PAP authentication packet to the peer.

     
    Step 17end


    Example:
    Device(config-if)# end
     

    Exits interface configuration mode and returns to privileged EXEC mode.

     

    Configuring PPPoE on the Server

    SUMMARY STEPS

      1.    enable

      2.    configure terminal

      3.    username username password password

      4.    bba-group pppoe bba-group-name

      5.    virtual-template template-number

      6.    exit

      7.    interface loopback interface-number

      8.    Do one of the following:

      • ip address ip-address mask
      • ipv6 address ipv6-address /prefix

      9.    exit

      10.    interface type number

      11.    Do one of the following:

      • no ip address
      • no ipv6 address

      12.    pppoe enable group bba-group-name

      13.    exit

      14.    interface virtual-template number

      15.    Do one of the following:

      • ip unnumbered loopback number
      • ipv6 unnumbered loopback number

      16.    description description

      17.    mtu size

      18.    Do one of the following:

      • peer default ip address pool local-pool-name
      • peer default ipv6 address pool local-pool-name
      • ipv6 dhcp server dhcp-pool-name

      19.    ppp authentication protocol

      20.    exit

      21.    ipv6 dhcp pool dhcp-pool-name

      22.    prefix-delegation pool local-pool-name

      23.    Do one of the following:

      • ip local pool pool-name [low-ip-address [high-ip-address]]
      • ipv6 local pool pool-name ipv6-subnet-id /prefix prefix-length

      24.    end


    DETAILED STEPS
       Command or ActionPurpose
      Step 1 enable


      Example:
      Device> enable
       

      Enables privileged EXEC mode.

      • Enter your password if prompted.

       
      Step 2configure terminal


      Example:
      Device# configure terminal
       

      Enters global configuration mode.

       
      Step 3username username password password


      Example:
      Device(config)# username username1 password password1
       

      Creates a PPPoE profile and enters BBA group configuration mode.

       
      Step 4bba-group pppoe bba-group-name


      Example:
      Device(config)# bba-group pppoe bba1
       

      Creates a PPPoE profile and enters BBA group configuration mode.

       
      Step 5virtual-template template-number


      Example:
      Device(config-bba-group)# virtual-template 1
       

      Creates a virtual template for a PPPoE profile with an identifying number to be used for cloning virtual access interfaces.

      • The range is 1 to 4095.

       
      Step 6exit


      Example:
      Device(config-bba-group)# exit
       

      Exits BBA group configuration mode and returns to global configuration mode.

       
      Step 7interface loopback interface-number


      Example:
      Device(config)# interface loopback 1
       

      Creates a loopback interface that emulates an interface that is always up and enters interface configuration mode.

      • The range is from 0 to 2147483647.

       
      Step 8Do one of the following:
      • ip address ip-address mask
      • ipv6 address ipv6-address /prefix


      Example:Using an IPv4 address:
      Device(config-if)# ip address 192.2.0.2 255.255.255.0


      Example:Using an IPv6 address:
      Device(config-if)# ipv6 address 2001:DB8:2::1/40
       

      Assigns an IP address to the loopback interface.

       
      Step 9exit


      Example:
      Device(config-if)# exit
       

      Exits interface configuration mode and enters global configuration mode.

       
      Step 10interface type number


      Example:
      Device(config)# interface GigabitEthernet 0/0/0
       

      Configures an interface and enters interface configuration mode.

       
      Step 11Do one of the following:
      • no ip address
      • no ipv6 address


      Example:For an IPv4 address:
      Device(config-if)# no ip address


      Example:For an IPv6 address:
      Device(config-if)# no ipv6 address
       

      Removes the IP address.

       
      Step 12pppoe enable group bba-group-name


      Example:
      Device(config-if)# pppoe enable group bba1
       

      Enables PPPoE sessions on the Gigabit Ethernet interface.

       
      Step 13exit


      Example:
      Device(config-if)# exit
       

      Exits interface configuration mode and returns to global configuration mode.

       
      Step 14interface virtual-template number


      Example:
      Device(config)# interface virtual-template 1
       

      Creates a virtual template interface that can be configured and applied dynamically to create virtual access interfaces and enters interface configuration mode.

       
      Step 15Do one of the following:
      • ip unnumbered loopback number
      • ipv6 unnumbered loopback number


      Example:For IPv4:
      Device(config-if)# ip unnumbered loopback 1


      Example:For IPv6:
      Device(config-if)# ipv6 unnumbered loopback 1
       

      Enables IP processing on an interface without explicitly assigning an IP address to the interface.

      • The type argument is the interface on which the router has assigned an IP address.

      • The number argument is the number of the interface on which you want to enable IP processing.

       
      Step 16description description


      Example:
      Device(config-if)# description pppoe bba1
       

      Adds a description to an interface configuration

       
      Step 17mtu size


      Example:
      Device(config-if)# mtu 1492
       

      Sets the MTU size.

      • The range is from 64 to 9216.

       
      Step 18Do one of the following:
      • peer default ip address pool local-pool-name
      • peer default ipv6 address pool local-pool-name
      • ipv6 dhcp server dhcp-pool-name


      Example:For IPv4 addresses
      Device(config-if)# peer default ip address pool pool1


      Example:For IPv6 addresses
      Device(config-if)# peer default ipv6 address pool pool1


      Example:For DHCP assigned addresses:
      Device(config-if)# ipv6 dhcp server dhcpv6pool
       

      Specifies an address pool to provide IP addresses for remote peers connecting to this interface.

       
      Step 19ppp authentication protocol


      Example:
      Device(config-if)# ppp authentication pap
       

      Enables at least one PPP authentication protocol and specifies the order in which the protocols are selected on the interface.

       
      Step 20exit


      Example:
      Device(config-if)# exit
       

      Exits interface configuration mode and returns to global configuration mode.

       
      Step 21ipv6 dhcp pool dhcp-pool-name


      Example:
      Device(config)# ipv6 dhcp pool dhcpv6pool
       

      Creates a DHCP information pool and configures a local prefix pool from which prefixes can be delegated to clients.

       
      Step 22prefix-delegation pool local-pool-name


      Example:
      Device(config-dhcpv6)# prefix-delegation pool pool1
       

      Specifies a local prefix pool.

       
      Step 23Do one of the following:
      • ip local pool pool-name [low-ip-address [high-ip-address]]
      • ipv6 local pool pool-name ipv6-subnet-id /prefix prefix-length


      Example:For IPv4 addresses
      Device(config)# ip local pool pool1 192.2.0.1 192.2.0.10


      Example:For IPv6 addresses
      Device(config)# ipv6 local pool pool1 2001:DB8:1200::/40 48
       

      Configures a local pool of IP addresses to be used when a remote peer connects to a point-to-point interface.

       
      Step 24end


      Example:
      Device(config)# end
       

      Exits global configuration mode and returns to privileged EXEC mode.

       

      Configuration Examples for the PPP over Ethernet Client

      Example: Configuring a PPPoE Client

      Device> enable 
Device# configure terminal
Device(config)# interface GigabitEthernet 0/0/0
Device(config-if)# no ip address
Device(config-if)# pppoe enable
Device(config-if)# pppoe-client dial-pool-number 1 
Device(config-if)# no shutdown 
Device(config-if)# exit
Device(config)# interface dialer 1
Device(config-if)# mtu 1492 
Device(config-if)# ip address negotiated
Device(config-if)# encapsulation ppp
Device(config-if)# dialer pool 1
Device(config-if)# ppp pap sent-username username1 password password1
Device(config-if)# end

      Example: Configuring PPPoE on IPv4

      Example: Server Configuration

      Device> enable
Device# configure terminal
Device# username username1 password password1
Device(config)# bba-group pppoe bba1
Device(config-bba-group)# virtual-template 1
Device(config-bba-group)# exit
Device(config)# interface loopback 1
Device(config-if)# ip address 192.2.0.2 255.255.255.0
Device(config-if)# exit
Device(config)# interface GigabitEthernet 0/0/0
Device(config-if)# no ip address
Device(config-if)# negotiation auto
Device(config-if)# pppoe enable group bba1
Device(config-if)# no shutdown
Device(config-if)# exit
Device(config)# interface virtual-template 1
Device(config-if)# description pppoe bba1
Device(config-if)# mtu 1492
Device(config-if)# ip unnumbered loopback 1
Device(config-if)# peer default ip address pool pool1
Device(config-if)# ppp authentication pap
Device(config-if)# exit
Device(config)# ip local pool pool1 192.2.0.1 192.2.0.10
Device(config)# end

      Example: Client Configuration

      Device> enable 
Device# configure terminal
Device(config)# interface GigabitEthernet 0/0/0
Device(config-if)# no ip address
Device(config-if)# pppoe enable
Device(config-if)# pppoe-client dial-pool-number 1 
Device(config-if)# no shutdown 
Device(config-if)# exit
Device(config)# interface dialer 1
Device(config-if)# mtu 1492 
Device(config-if)# ip address negotiated
Device(config-if)# encapsulation ppp
Device(config-if)# dialer pool 1
Device(config-if)# ppp pap sent-username username1 password password1
Device(config-if)# end

      Example: Configuring PPPoE on IPv6 using DHCP

      Example: Server Configuration using DHCP

      Configure a username and a password for PPP client:

      Host(config)# username username1 password password1

      Create a PPP group GROUPA and associate it with a Virtual Template 1:

      Host(config)# bba-group pppoe GROUPA
Host(config-bba-group)# virtual-template 1
Host(config-bba-group)# exit

      Configure a loopback interface to be used on the Virtual Template 1:

      Host(config)# interface loopback 1
Host(config-if)# ipv6 address 2001:DB8:2::1/40

%LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up
Host(config-if)# exit

      Create a Virtual Template 1 and use the loopback interface as the IP address: 

      Host(config)# interface virtual-template 1
Host(config-if)# ipv6 unnumbered loopback 1
Host(config-if)# description pppoe GROUPA
Host(config-if)# mtu 1492

!Specify that PPP PAP authentication is used for authenticating connecting PPP 
!clients
Host(config-if)# ppp authentication pap

!Enables DHCP for IPv6 service for the interface and specifies a pool for prefix 
!delegation. 
Host(config-if)# ipv6 dhcp server dhcpv6pool

Host(config-dhcp)# exit

      Associate a physical interface with the PPP group GROUPA:

      Host(config)# interface FastEthernet 0/0
Host(config-if)# no ip address
Host(config-if)# pppoe enable group GROUPA
Host(config-if)# no shutdown
Host(config-if)# exit

      Create the local IPV6 address pool pool1 referred to in the Virtual Template 1

      Host(config)# ipv6 local pool pool1 2001:DB8:1200::/40 48

      Create a DHCP information pool and configure a local prefix pool from which prefixes can be delegated to clients.

      Host(config)# ipv6 dhcp pool dhcpv6pool

!Specify local prefix pool
Host(config-dhcpv6)# prefix-delegation pool pool1
Host(config-dhcpv6)# end

      Example: Client Configuration using DHCP

      Device> enable 
Device# configure terminal
Device(config)# hostname Client

      Configure a physical interface and allocate it to a dialer pool. A logical dialer interface associated with the dialer pool can select a physical interface from this dialer pool when needed.

      Client(config)# interface FastEthernet 0/0
Client(config-if)# no ip address
Client(config-if)# pppoe enable group global

!Allocate the physical interface to the dialer pool
Client(config-if)# pppoe-client dial-pool-number 1 
Client(config-if)# no shutdown 

%LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
Client(config-if)# exit

      Create the logical dialer interface and configure the pool used to pick physical interfaces

      Client(config)# interface dialer 1

!Configure the pool used to pick physical interfaces.
Client(config-if)# dialer pool 1

!Sets the encapsulation method used by the interface to PPP.
Client(config-if)# encapsulation ppp 
Client(config-if)# ipv6 enable 

*Jun  2 23:51:36.455: %DIALER-6-BIND: Interface Vi2 bound to profile Di1
*Jun  2 23:51:36.459: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Jun  2 23:51:36.507: %DIALER-6-UNBIND: Interface Vi2 unbound from profile Di1
*Jun  2 23:51:36.519: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down

!Enable Prefix delegation on the interface
Client(config-if)# ipv6 dhcp client pd dhcp_prefix_label

!Reduce MTU of the dialer interface to avoid unnecessary fragmentation caused by added 
PPP headers.
Client(config-if)# mtu 1492
Client(config-if)# ppp authentication pap callin

!Configures the username and password that the client can use to authenticate with the
 server.
Client(config-if)# ppp pap sent-username username1 password password1

*Jun  2 23:52:20.999: %DIALER-6-BIND: Interface Vi2 bound to profile Di1
*Jun  2 23:52:21.003: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Jun  2 23:52:21.103: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
Client(config-if)# end

      Example: Verifying the PPPoE connection

      Observe the interfaces of the client:

      Client#show ipv6 interface brief

FastEthernet0/0            [up/up]
    unassigned
Dialer1                    [up/up]
    FE80::205:FF:FE50:6C08
Virtual-Access1            [up/up]
    unassigned

      Observe the PPPoE session on the client:

      Client# show pppoe session

     1 client session

Uniq ID  PPPoE  RemMAC          Port                    VT  VA         State
           SID  LocMAC                                      VA-st      Type
    N/A    324  0005.0050.9c08  Fa0/0                  Di1  Vi2        UP
                0005.0050.6c08                              UP

      Observe the packets exchanged during the PPPoE session:

      Client# show pppoe session packets

Total PPPoE sessions 1

SID     Pkts-In         Pkts-Out        Bytes-In        Bytes-Out
2846    0               6216            0               128136

      Observe the DHCP session:

      Server# show ipv6 dhcp binding

Client: FE80::205:FF:FE50:6C08
  DUID: 00030001000500506C08
  Username : unassigned
  Interface : Virtual-Access1.1
  IA PD: IA ID 0x000D0001, T1 302400, T2 483840
    Prefix: 2001:DB8::/48
            preferred lifetime 604800, valid lifetime 2592000
            expires at Jul 01 2013 09:17 PM (2591979 seconds)

Server# show ipv6 dhcp pool

DHCPv6 pool: dhcpv6pool
  Prefix pool: pool1
               preferred lifetime 604800, valid lifetime 2592000
  Active clients: 1

      Example: Configuring PPPoE on IPv6

      Configuring PPPoE on the Server

      Device> enable
Device# configure terminal
Device(config)# hostname Host

      Configure a username and a password for PPP client:

      Host# username username1 password password1

      Create a PPP group GROUPA and associate it with a Virtual Template 1:

      Host(config)# bba-group pppoe GROUPA

*Jun  1 21:30:55.587: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
*Jun  1 21:30:55.591: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up
Host(config-bba-group)# virtual-template 1
Host(config-bba-group)# exit

      Configure a loopback interface to be used on the Virtual Template 1:

      Host(config)# interface loopback 1
Host(config-if)# ipv6 address 2001:DB8:2::1/40

%LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to up
Host(config-if)# exit

      Create a Virtual Template 1 and use the loopback interface as the IP address: 

      Host(config)# interface virtual-template 1
Host(config-if)# ipv6 unnumbered loopback 1
Host(config-if)# description pppoe GROUPA
Host(config-if)# mtu 1492

!Configure the Virtual Template to hand out IP addresses from pool1
Host(config-if)# peer default ipv6 pool pool1

!Specify that PPP PAP authentication is used for authenticating connecting PPP clients
Host(config-if)# ppp authentication pap
Host(config-if)# exit

      Associate a physical interface with the PPP group GROUPA:

      Host(config)# interface FastEthernet 0/0
Host(config-if)# no ip address
Host(config-if)# pppoe enable group GROUPA
Host(config-if)# no shutdown
Host(config-if)# exit

*Jun  1 21:33:07.199: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Jun  1 21:33:08.199: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

      Create the IPV6 address pool pool1 referred to in the Virtual Template 1:

      Host(config)# ipv6 local pool pool1 2001:DB8:1200::/40 48
Host(config)# end

      Configuring PPPoE on the Client

      Device> enable 
Device# configure terminal
Device(config)# hostname Host

      Configure a physical interface and allocate it to a dialer pool. A logical dialer interface associated with the dialer pool can select a physical interface from this dialer pool when needed.

      Client(config)# interface FastEthernet 0/0
Client(config-if)# no ip address
Client(config-if)# pppoe enable group global

!Allocate the physical interface to the dialer pool
Client(config-if)# pppoe-client dial-pool-number 1 
Client(config-if)# no shutdown 

%LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
Client(config-if)# exit

      Create the logical dialer interface and configure the pool used to pick physical interfaces

      Client(config)# interface dialer 1

!Configure the pool used to pick physical interfaces.
Client(config-if)# dialer pool 1

!Sets the encapsulation method used by the interface to PPP.
Client(config-if)# encapsulation ppp 
Client(config-if)# ipv6 enable 

*Jun  3 00:10:48.031: %DIALER-6-BIND: Interface Vi2 bound to profile Di1
*Jun  3 00:10:48.035: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Jun  3 00:10:48.083: %DIALER-6-UNBIND: Interface Vi2 unbound from profile Di1
*Jun  3 00:10:48.091: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down

!Configure the PPP clients to get IP addresses for dialer interfaces by using
!PPP negotiations with the server.
Client(config-if)# ipv6 address autoconfig

!Reduce MTU of the dialer interface to avoid unnecessary fragmentation caused by added PPP 
!headers
Client(config-if)# mtu 1492
Client(config-if)# ppp authentication pap callin

!Configures the username and password that the client can use to authenticate with the 
!server.
Client(config-if)# ppp pap sent-username username1 password password1

*Jun  3 00:11:54.843: %DIALER-6-BIND: Interface Vi2 bound to profile Di1
*Jun  3 00:11:54.847: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Jun  3 00:11:54.939: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up

Client(config-if)# end

      Verifying the PPPoE connection

      Observe the interfaces of the client:

      Client# show ipv6 interface brief

FastEthernet0/0            [up/up]
    unassigned
Dialer1                    [up/up]
    FE80::205:FF:FE50:6C08
Virtual-Access1            [up/up]
    unassigned

      Observe the PPPoE session on the client:

      Client# show pppoe session

     1 client session

Uniq ID  PPPoE  RemMAC          Port                    VT  VA         State
           SID  LocMAC                                      VA-st      Type
    N/A    324  0005.0050.9c08  Fa0/0                  Di1  Vi2        UP
                0005.0050.6c08                              UP

      Observe the packets exchanged during the PPPoE session:

      Client# show pppoe session packets

Total PPPoE sessions 1

SID     Pkts-In         Pkts-Out        Bytes-In        Bytes-Out
2846    0               6216            0               128136

      Additional References

      Related Documents

      Related Topic

      Document Title

      Cisco IOS commands

      Cisco IOS Master Commands List, All Releases

      Broadband Access Aggregation and DSL commands

      Cisco IOS Broadband Access Aggregation and DSL Command Reference

      Technical Assistance

      Description

      Link

      The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

      http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

      Feature Information for PPP over Ethernet Client

      The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

      Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.
      Table 1 Feature Information for PPP over Ethernet Client

      Feature Name

      Releases

      Feature Information

      PPP over Ethernet Client for IPv6

      Cisco IOS XE Release 3.9S

      The PPP over Ethernet Client feature provides IPv6 support.

      PPP over Ethernet Client

      Cisco IOS XE Release 3.5S

      This feature was introduced.

      The PPP over Ethernet Client feature provides PPPoE client support on routers.