PPPoE on Ethernet

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Updated:January 14, 2008

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PPPoE on Ethernet

Table Of Contents

PPPoE on Ethernet

Finding Feature Information

Contents

Prerequisites for PPPoE on Ethernet

Restrictions for PPPoE on Ethernet

Information About PPPoE on Ethernet

Benefits of Using PPPoE on Ethernet

How to Enable and Configure PPPoE on Ethernet

Configuring PPPoE on Ethernet in a BBA Group

Limiting PPPoE Sessions from a MAC Address

Creating and Configuring a Virtual Template

Configuration Examples for PPPoE on Ethernet

PPPoE on Ethernet: Example

Enabling PPPoE on an Ethernet Interface: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for PPPoE on Ethernet

PPPoE on Ethernet

First Published: March 31, 2000

Last Updated: November 20, 2009

The PPPoE on Ethernet feature adds support to Point-to-Point Protocol over Ethernet (PPPoE) by adding direct connection to actual Ethernet interfaces. PPPoE provides service-provider digital subscriber line (DSL) support. This Ethernet specification can be used by multiple hosts on a shared Ethernet interface to open PPP sessions to multiple destination with one or more bridging modems.

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 Ethernet" 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 Ethernet

•Restrictions for PPPoE on Ethernet

•Information About PPPoE on Ethernet

•How to Enable and Configure PPPoE on Ethernet

•Configuration Examples for PPPoE on Ethernet

•Additional References

•Feature Information for PPPoE on Ethernet

Prerequisites for PPPoE on Ethernet

Before you can configure the PPPoE on Ethernet feature, you need to configure a broadband access (BBA) group using the bba-group pppoe command and specify a virtual template for PPPoE sessions.

Restrictions for PPPoE on Ethernet

The following restrictions apply when the PPPoE on Ethernet feature is used:

•PPPoE is not supported on Frame Relay.

•PPPoE is not supported on any other LAN interfaces such as FDDI and Token Ring.

•Fast switching is supported. PPP over Ethernet over RFC 1483 fibswitching is supported for IP. All other protocols are switched over process switching.

Information About PPPoE on Ethernet

To configure the PPPoE on Ethernet feature, you should understand the following concept:

•Benefits of Using PPPoE on Ethernet

Benefits of Using PPPoE on Ethernet

Broadband Remote Access

For a bridged-Ethernet topology, the PPPoE on Ethernet feature allows access providers to maintain session abstraction associated with PPP networks.

PPPoE

PPPoE provides the ability to connect a network of hosts over a simple bridging access device to a remote access concentrator where each host utilizes its own PPP stack. It also gives users a familiar interface.

PPPoE provides service-provider DSL support. In service-provider DSL deployments, PPPoE leverages Ethernet scale curves and it uses an embedded base.

How to Enable and Configure PPPoE on Ethernet

This section contains the following procedures:

•Configuring PPPoE on Ethernet in a BBA Group (required)

•Limiting PPPoE Sessions from a MAC Address (optional)

•Creating and Configuring a Virtual Template (optional)

Configuring PPPoE on Ethernet in a BBA Group

Perform this task to configure the physical interface that will carry the PPPoE session in the broadband access (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. sessions per-mac limit per-mac-limit

6. sessions per-vlan limit per-vlan-limit [inner vlan-id ]

7. sessions per-vc limit per-vc-limit [threshold threshold-value]

8. exit

DETAILED STEPS

Command

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

bba-group pppoe {group-name | global}

Example:

Router(config)# bba-group pppoe server-selection

Defines a PPP over Ethernet (PPPoE) profile, and enters BBA group mode.

•The global keyword creates a profile, which serves as the default profile for any PPPoE port that is not assigned a specific profile.

Step 4

virtual template template-number

Example:

(config-bba-group)# virtual-template 20

Specifies the virtual template number for the BBA group, and places the router in configuration BBA group mode.

Step 5

sessions per-mac limit per-mac-limit

Example:

Router(config-bba-group)# sessions per-mac limit 1000

(Optional) Sets the maximum number of PPPoE sessions allowed per MAC session limit in a PPPoE profile.

Step 6

sessions per-vlan limit per-vlan-limit [inner vlan-id]

Example:

Router(config-bba-group)# session per-vlan limit 4000 inner 3500

(Optional) Sets the session limit for the inner VLAN on QinQ subinterface.

Note The per-VLAN limit is only applicable to Gigabit Ethernet subinterfaces (802.1q VLANs).

Step 7

sessions per-vc limit per-vc-limit [threshold threshold-value]

Example:

Router(config-bba-group)# sessions per-vc limit 2000

(Optional) Sets the maximum number of PPPoE sessions allowed per VC session limit in a PPPoE profile.

Note The per-VC limit is applicable only to ATM interfaces andsubinterfaces .

Step 8

exit

Example:

Router(config-bba-group)# exit

Returns to global configuration mode.

Limiting PPPoE Sessions from a MAC Address

Perform this task to set the limit of sessions to be sourced from a MAC address:

SUMMARY STEPS

1. enable

2. configure terminal

3. virtual-template template-number

4. sessions per-mac limit per-mac-limit

5. exit

DETAILED STEPS

Command

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

virtual-template template-number

Example:

Router(config-bba-group)# virtual-template 1

Specifies which virtual template will be used to clone virtual access interfaces for all PPPoE ports that use this PPPoE profile.

Step 4

sessions per-mac limit per-mac-limit

Example:

Router(config-bba-group)# sessions per-mac limit 1000

(Optional) Sets the maximum number of PPPoE sessions allowed per MAC session limit in a PPPoE profile.

Step 5

exit

Example:

Router(config-bba-group)# exit

Returns to global configuration mode.

Creating and Configuring a Virtual Template

Perform this task to create and configure a virtual template:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface virtual-template number

4. ip unnumbered loopback number

5. mtu bytes

6. exit

DETAILED STEPS
Command

Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.
Step 3
Router(config)# interface virtual-template number 
Example:
Router(config)# interface virtual-template 0
Creates a virtual template, and enters interface configuration mode.
Step 4
Router(config-if)# ip unnumbered loopback number
Example:

Router(config-if)# ip unnumbered loopback 0
Enables IP without assigning a specific IP address on the LAN.
Step 5
Router(config-if)# mtu bytes
Example:
Router(config-if)# mtu 1492
Sets the maximum transmission unit (MTU) size for the interface.
Step 6

exit

Example:

Router(config-bba-group)# exit

Returns to global configuration mode.
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.

Note The PPP reliable link that uses Link Access Procedure, Balanced (LAPB) is not supported.

Configuration Examples for PPPoE on Ethernet

This section provides the following configuration examples:

•PPPoE on Ethernet: Example

•Enabling PPPoE on an Ethernet Interface: Example

PPPoE on Ethernet: Example

The following example shows how to configure the bba-group and virtual-template commands:
bba-group pppoe server-selection
  virtual-template 1
  sessions per-mac limit 1000
  sessions per-vlan limit 4000 inner 3500
  sessions per-vc limit 2000
  interface virtual-template 0
  ip unnumbered loopback 0
  mtu 1492
For PPPoE virtual template interfaces, the mtu command must be configured because Ethernet has a maximum payload size of 1500 bytes, the PPPoE header is 6 bytes, and PPP Protocol ID is 2 bytes.

Note Dial-out mode will not be supported.

Enabling PPPoE on an Ethernet Interface: Example

The following example shows how to enable PPPoE on an Ethernet interface:
interface ethernet1/0 
 pppoe enable
Additional References

The following sections provide references related to the PPPoE on Ethernet feature.

Related Documents

Related Topic

Document Title

Configuring PPPoE on ATM

PPPoE over ATM

Configuring PPPoE on cable interfaces

•Point-to-Point Protocol over Ethernet Support on the Cisco CMTS

•Configuring PPPoE Termination on a uBR7100 CMTS with L2TP Tunneling

Configuring PPPoE on IEEE 802.1Q encapsulation

PPPoE Over IEEE 802.1Q VLANs

Standards

Standard

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

RFC 2516

A Method for Transmitting PPPoE

RFC 4813

Multiprotocol Encapsulation over ATM Adaptation Layer 5

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

Feature Information for PPPoE on Ethernet

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.

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.

Table 1 Feature Information for PPPoE on Ethernet

Feature Name

Releases

Feature Information

PPPoE on Ethernet

12.1(2)T
12.2(11)YT
12.2(11)YV
12.2(8)T
12.2(13)T
12.2(28)SB
12.2(33)SRC

This feature adds support to PPPoE by adding direct connection to actual Ethernet interfaces. PPPoE provides service-provider digital subscriber line (DSL) support. This Ethernet specification can be used by multiple hosts on a shared Ethernet interface to open PPP sessions to multiple destination with one or more bridging modems.

Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2000-2009 Cisco Systems, Inc. All rights reserved.

	Command	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	bba-group pppoe {group-name \| global} Example: Router(config)# bba-group pppoe server-selection	Defines a PPP over Ethernet (PPPoE) profile, and enters BBA group mode. •The global keyword creates a profile, which serves as the default profile for any PPPoE port that is not assigned a specific profile.
Step 4	virtual template template-number Example: (config-bba-group)# virtual-template 20	Specifies the virtual template number for the BBA group, and places the router in configuration BBA group mode.
Step 5	sessions per-mac limit per-mac-limit Example: Router(config-bba-group)# sessions per-mac limit 1000	(Optional) Sets the maximum number of PPPoE sessions allowed per MAC session limit in a PPPoE profile.
Step 6	sessions per-vlan limit per-vlan-limit [inner vlan-id] Example: Router(config-bba-group)# session per-vlan limit 4000 inner 3500	(Optional) Sets the session limit for the inner VLAN on QinQ subinterface. Note The per-VLAN limit is only applicable to Gigabit Ethernet subinterfaces (802.1q VLANs).
Step 7	sessions per-vc limit per-vc-limit [threshold threshold-value] Example: Router(config-bba-group)# sessions per-vc limit 2000	(Optional) Sets the maximum number of PPPoE sessions allowed per VC session limit in a PPPoE profile. Note The per-VC limit is applicable only to ATM interfaces andsubinterfaces .
Step 8	exit Example: Router(config-bba-group)# exit	Returns to global configuration mode.

	Command	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	virtual-template template-number Example: Router(config-bba-group)# virtual-template 1	Specifies which virtual template will be used to clone virtual access interfaces for all PPPoE ports that use this PPPoE profile.
Step 4	sessions per-mac limit per-mac-limit Example: Router(config-bba-group)# sessions per-mac limit 1000	(Optional) Sets the maximum number of PPPoE sessions allowed per MAC session limit in a PPPoE profile.
Step 5	exit Example: Router(config-bba-group)# exit	Returns to global configuration mode.

	Command	Purpose
Step 1	enable Example: Router> enable	Enables privileged EXEC mode. •Enter your password if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters global configuration mode.
Step 3	Router(config)# interface virtual-template number Example: Router(config)# interface virtual-template 0	Creates a virtual template, and enters interface configuration mode.
Step 4	Router(config-if)# ip unnumbered loopback number Example: Router(config-if)# ip unnumbered loopback 0	Enables IP without assigning a specific IP address on the LAN.
Step 5	Router(config-if)# mtu bytes Example: Router(config-if)# mtu 1492	Sets the maximum transmission unit (MTU) size for the interface.
Step 6	exit Example: Router(config-bba-group)# exit	Returns to global configuration mode.

Related Topic	Document Title
Configuring PPPoE on ATM	PPPoE over ATM
Configuring PPPoE on cable interfaces	•Point-to-Point Protocol over Ethernet Support on the Cisco CMTS •Configuring PPPoE Termination on a uBR7100 CMTS with L2TP Tunneling
Configuring PPPoE on IEEE 802.1Q encapsulation	PPPoE Over IEEE 802.1Q VLANs

Standard	Title
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.	—

MIB	MIBs Link
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.	To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs

RFC	Title
RFC 2516	A Method for Transmitting PPPoE
RFC 4813	Multiprotocol Encapsulation over ATM Adaptation Layer 5

Description	Link
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.	http://www.cisco.com/techsupport

Table 1 Feature Information for PPPoE on Ethernet
Feature Name	Releases	Feature Information
PPPoE on Ethernet	12.1(2)T 12.2(11)YT 12.2(11)YV 12.2(8)T 12.2(13)T 12.2(28)SB 12.2(33)SRC	This feature adds support to PPPoE by adding direct connection to actual Ethernet interfaces. PPPoE provides service-provider digital subscriber line (DSL) support. This Ethernet specification can be used by multiple hosts on a shared Ethernet interface to open PPP sessions to multiple destination with one or more bridging modems.

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