Table Of Contents
Prerequisites for PPPoE on ATM
Information About PPPoE on ATM
Benefits of Using PPPoE on ATM
How to Enable and Configure PPPoE on ATM
Creating and Configuring a Virtual Template
Enabling PPPoE on an ATM PVC Range
Feature Information for PPPoE on ATM
PPPoE on ATM
First Published: March 27, 2000Last Updated: November 20, 2009The PPPoE on ATM feature provides the ability to connect a network of hosts over a simple bridging-access device to a remote access concentrator. With this model, each host utilizes its own PPPoE stack and the user is presented with a familiar user interface. Access control, billing, and type of service can be done on a per-user, rather than a per-site, basis. Before a point-to-point connection over Ethernet can be provided, each Point-to-Point (PPP) session must learn the Ethernet address of the remote peer and establish a unique session identifier. A unique session identifier is provided by the PPP over Ethernet (PPPoE) Discovery Stage protocol.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for PPPoE on ATM" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•
Prerequisites for PPPoE on ATM
•
Restrictions for PPPoE on ATM
•
Information About PPPoE on ATM
•
How to Enable and Configure PPPoE on ATM
•
Feature Information for PPPoE on ATM
Prerequisites for PPPoE on ATM
Before you can configure PPPoE on ATM, you need to configure the physical interface that will carry the PPPoE session in the broadband access (BBA) groups and specify a virtual template for PPPoE sessions.
Restrictions for PPPoE on ATM
The following restrictions apply when the PPPoE on ATM feature is used:
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Bridging is supported on the ATM permanent virtual circuits (PVCs) running PPPoE.
•
PPPoE will be supported on ATM PVCs compliant with RFC 1483 only.
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Only dial-in mode will be supported. Dial-out mode will not be supported.
•
Two thousand simultaneous PPP sessions are supported on the Cisco series 7200 with ATM Deluxe port adapters and on the Cisco series 6400 platforms only, both with 128 MB of DRAM.
Information About PPPoE on ATM
To configure PPPoE on ATM, you should understand the following concept:
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Benefits of Using PPPoE on ATM
Benefits of Using PPPoE on ATM
The PPPoE on ATM feature provides service-provider digital subscriber line (DSL) support. As service providers begin DSL deployments, two of their most significant goals are to ease and facilitate consumer end adoption and to preserve as much of the dialup model as possible. PPPoE serves to advance both of these goals by leveraging Ethernet scale curves and embedded base (such as ATM NICs) and by preserving the point-to-point session used by Internet service providers (ISPs) in today's dialup model.
Using a PPPoE client (available from RouterWare), a PPP session can be initiated on an Ethernet connected client through a standard ADSL modem. The session is transported over the ATM DSL link via RFC 1483 Ethernet bridged frames and can terminate either in the LAN emulation client (LEC) central office or the ISP point of presence (POP). The termination device can be an aggregation box such as the Cisco 6400 or a router such as the Cisco 7200 series platforms.
As customers deploy asymmetric DSL (ADSL), they will encounter the need to enable users to access remote-access concentrators via simple bridges connecting Ethernet and ATM networks.
How to Enable and Configure PPPoE on ATM
This section contains the following procedures:
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Configuring the BBA Group (required)
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Creating and Configuring a Virtual Template (optional)
•
Enabling PPPoE on an ATM PVC Range
Configuring the BBA Group
Perform this task to configure the physical interface that will carry the PPPoE session in the BBA groups and link it to the appropriate virtual template interface.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
bba-group pppoe {group-name | global}
4.
virtual-template template-number
5.
end
DETAILED STEPS
Creating and Configuring a Virtual Template
Perform this task to create and configure a virtual template.
Please note that other optional configuration commands can be added to the virtual template configuration. For example, you can enable the PPP authentication on the virtual template using the ppp authentication chap command. See the "Virtual Interface Template Service" chapter in the Cisco IOS Dial Solutions Configuration Guide for more information about configuring the virtual template.
Although Cisco Express Forwarding switching is supported, flow, and optimum switching are not; these configurations are ignored on the PPPoE virtual access interface. Cisco Express Forwarding is enabled by default for IP. All other protocol traffic will be processed switched.
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Note
The PPP reliable link that uses Link Access Procedure, Balanced (LAPB) is not supported.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface virtual-template number [type [ethernet | serial | tunnel]]
4.
ip unnumbered ethernet number
5.
mtu bytes
6.
end
DETAILED STEPS
Enabling PPPoE on an ATM PVC
Perform this task to enable PPPoE on an ATM PVC:
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface atm number.subinterface-number {multipoint | point-to-point}
4.
pvc [name] vpi/vci
5.
encapsulation aal5snap [bridge]
6.
protocol pppoe [group group-name]
7.
end
DETAILED STEPS
Enabling PPPoE on an ATM PVC Range
Perform this task to enable PPPoE on an ATM PVC range.
1.
enable
2.
configure terminal
3.
interface atm number [.subinterface-number {multipoint | point-to-point}]
4.
range [range-name] pvc [start-vpi/]start-vci [end-vpi/]end-vci
5.
encapsulation aal5snap [bridge]
6.
protocol pppoe [group group-name]
7.
end
DETAILED STEPS
Additional References
The following sections provide references related to the PPPoE on Ethernet feature.
Related Documents
Standards
Standard TitleNo new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.
—
MIBs
RFCs
RFC TitleRFC 2516
A Method for Transmitting PPPoE
RFC 4813
Multiprotocol Encapsulation over ATM Adaptation Layer 5
Technical Assistance
Feature Information for PPPoE on ATM
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
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Note
Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
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