PPPoE – PPP over Ethernet

PPP can be encapsulated over Ethernet and it can be used to offer authentication over Ethernet connections. It cannot be used for Multilinking Ethernet connections. When using PPPoE we need a server and a client.
Server Side
Configuring the server makes use of the Virtual Template/Virtual Access interfaces. We configure the Virtual Template interface, but the Virtual Access interface will be up/up in the process. Its configuration will be taken from the Vitual Template interface.
First define the Virtual Template that will hold the PPP configuration:
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R1(config)# int VIRTUAL-TEMPLATE-INT
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R1(config-if)# ip address IP-ADDR NETMASK
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! define IP assignment for clients:
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R1(config-if)# peer default ip address {CLIENT-IP | pool [IP-POOL]| dhcp-pool [DHCP-POOL] |dhcp}
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See PPP 101 for details about client IP assignment.
Then, configure the Broadband Access Group that points to the Virtual-Template interface:
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R1(config)# bba-group pppoe {GROUP-NAME|default}
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R1(config-bba-group)# VIRTUAL-TEMPLATE-INT
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The last step is to enable PPPoE on the physical interface and assign it to the BBA-Group:
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R1(config)# interface FAST-ETHERNET-INT
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R1(config-if)# pppoe enable group {GROUP|default}
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Client Side
On the client side, we have to make use of Dialer Interfaces. Dialer Interfaces will look for a physical interface available in their Dialer Pool before initiating connections
PPPoE Dialer
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R2(config)# interface DIALER1
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! By default Dialer interfaces have encapsulation set to HDLC.
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R2(config-if)# encapsulation ppp
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!Get the IP address from the server
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R2(config-if)# ip address {negotiated|IP-ADDR NETMASK}
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R2(config-if)# dialer-pool POOL-ID
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! What pool shoud I use?
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Physical interfaces are assigned to Dialer Pools:
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R2(config)# interface FASTETHERNET0
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! Link the Ethernet Interface to the Dialer interface via the dial-pool.
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R2(config-if)# pppoe-client dial-pool-number POOL-ID
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! What pool am I a member of?
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R2(config-if)# no shut
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R2(config-if)# end
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Additional information about Dialer Interfaces, can be found here.
After a little while we will see the assigned IP address on the interface and the PPP /32 ip route:
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R2#sh ip route
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Gateway of last resort is not set
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​
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     1.0.0.0/32 is subnetted, 1 subnets
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C       1.1.1.1 is directly connected, Dialer1
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     99.0.0.0/32 is subnetted, 1 subnets
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C       99.0.0.10 is directly connected, Dialer1
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​
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R2#sh ip int brie
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Interface                  IP-Address      OK? Method Status                Protocol
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FastEthernet0/0            unassigned      YES unset  up                    up
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FastEthernet0/1            unassigned      YES unset  administratively down down
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Virtual-Access1            unassigned      YES unset  up                    up
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Dialer1                    99.0.0.10       YES IPCP   up                    up
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R2#ping 1.1.1.1
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​
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Type escape sequence to abort.
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Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
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!!!!!
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Success rate is 100 percent (5/5), round-trip min/avg/max = 12/24/52 ms
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R2#
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If we want to enable authentication, just configure the PPP interfaces on each device, that is the Virtual-Template on the Server and the Dialer interface on the Client.

PPPoFR – PPP over Frame Relay

Frame Relay

Last modified 6mo ago

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Contents

Server Side

Client Side