POINT-TO-POINT PROTOCOL OVER ATM

'PPPOA' or 'PPPoA', 'Point-to-Point Protocol (PPP) over ATM', is a network protocol for encapsulating PPP frames in ATM AAL5. It is used mainly with cable modem, DSL and ADSL services.
It offers standard PPP features such as authentication, encryption, and compression. If it is used as the connection encapsulation method on an ATM based network it can reduce overhead slightly (around 0.58%) in comparison to PPPoE. It also avoids the issues that PPPoE suffers from, related to having a MTU lower than that of standard Ethernet transmission protocols. It also supports (as does PPPoE) the encapsulation types: VC-MUX and LLC based.
PPPoA is specified in RFC 2364.
To configure PPPoA on a Cisco router (not the CPE) providing DSL services, a "Virtual-Template" is configured, which is then bound to the ATM interface. A configuration snippet is below:

 Interface Virtual-Template1

 IP unnumbered FastEthernet0/0

 Peer default ip address pool dslPPP

 PPP authentication pap

interface ATM1/0.32 point-to-point

 pvc 1/32 

  ubr 640

  encapsulation aal5mux ppp Virtual-Template1

Contents

See also

External links

See also

★ PPPoE

★ L2TP

External links

★ A typical PPPoA architecture diagram
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