PPPoE Session Limiting on Inner QinQ VLAN

First Published: December 4, 2006
Last Updated: November 25, 2009

The PPPoE Session Limiting on Inner QinQ VLAN feature allows a service provider to limit each customer to one PPP over Ethernet (PPPoE) client in use by providing the ability to limit the number of PPPoE over QinQ (IEEE 802.1Q VLAN tunnel) sessions based on the inner VLAN ID configured under a subinterface. This capability eliminates the need to configure large numbers of subinterfaces.

Finding Feature Information

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 Session Limiting on Inner QinQ VLAN" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE 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 Session Limiting on Inner QinQ VLAN

•Restrictions for PPPoE Session Limiting on Inner QinQ VLAN

•Information About PPPoE Session Limiting on Inner QinQ VLAN

•How to Configure PPPoE Session Limiting on Inner QinQ VLAN

•Configuration Examples for PPPoE Session Limiting on Inner QinQ VLAN

•Additional References

•Feature Information for PPPoE Session Limiting on Inner QinQ VLAN

Prerequisites for PPPoE Session Limiting on Inner QinQ VLAN

•PPPoE server functionality must be configured.

•The PPPoE over IEEE 802.1Q VLANs feature must be configured.

Restrictions for PPPoE Session Limiting on Inner QinQ VLAN

•Do not configure the inner VLAN session limit to be greater than the outer session limit.

Information About PPPoE Session Limiting on Inner QinQ VLAN

To configure the PPPoE Session Limiting on Inner QinQ VLAN feature, you should understand the following concepts:

•Benefits of PPPoE Session Limiting on Inner QinQ VLAN

•Feature Design of PPPoE Session Limiting on Inner QinQ VLAN

Benefits of PPPoE Session Limiting on Inner QinQ VLAN

•Facilitates the ability to provision thousands of PPPoE over QinQ sessions having unique inner VLANs using simpler and easier to manage configurations.

•Allows service providers to limit PPPoE sessions based on the QinQ inner VLAN ID.

Feature Design of PPPoE Session Limiting on Inner QinQ VLAN

Prior to the PPPoE Session Limiting on Inner QinQ VLAN feature, PPPoE session limiting required a QinQ subinterface to be configured for each QinQ inner VLAN to be session limited, resulting in configuration requirements that did not scale to large numbers of QinQ VLAN ID pairs. The PPPoE Session Limiting on Inner QinQ VLAN feature adds broadband remote access server (BRAS) capability for configuring a single subinterface for all the unique inner VLAN IDs per outer VLAN while limiting one session per inner VLAN.

Figure 1 shows a typical implementation of the PPPoE Session Limiting on Inner QinQ VLAN feature.

Figure 1 PPPoE over QinQ Session Limiting

How to Configure PPPoE Session Limiting on Inner QinQ VLAN

This section contains the following procedure:

•Configuring PPPoE Session Limiting on Inner QinQ VLAN

Configuring PPPoE Session Limiting on Inner QinQ VLAN

Perform this task to configure PPPoE over QinQ session limiting and allows limiting, which allows you to limit the number of QinQ inner VLAN connections for each customer.

SUMMARY STEPS

1. enable

2. configure terminal

3. bba-group pppoe group-name

4. sessions per-vlan limit outer-per-vlan-limit inner inner-per-vlan-limit

5. end

DETAILED STEPS

 
Command or Action
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

Example:

Router(config)# bba-group pppoe group 1

Creates a PPPoE profile and enters the bba-group configuration mode.

Step 4 

sessions per-vlan limit outer-per-vlan-limit inner inner-per-vlan-limit

Example:

Router(config-bba-group)# sessions per-vlan-limit 400 inner 1

Configures inner and outer VLAN limits.

Step 5 

end

Example:

Router(config-bba-group)# end

(Optional) Exits the current configuration mode and enters the privileged EXEC mode.

Troubleshooting Tips

The following commands can help troubleshoot PPPoE session limiting:

•debug pppoe error

•show pppoe session

•show pppoe summary

Configuration Examples for PPPoE Session Limiting on Inner QinQ VLAN

This section provides the following configuration example:

•PPPoE Session Limiting on Inner QinQ VLAN: Example

PPPoE Session Limiting on Inner QinQ VLAN: Example

The following example shows how to enable PPPoE over QinQ session limiting on Fast Ethernet interface 1/0/0.1 with outer VLAN ID 10 and a unique inner VLAN ID for each session. 

Router(config)# bba-group pppoe group1	

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

Router(config-bba-group)# sessions per-vlan limit 1000 inner 1

Router(config)#interface eth1/0/0.1

Router(config-subif)# encapsulation dot1q 10 second-dot1q any

Router(config-subif)# enable group group1

Additional References

The following sections provide references related to the PPPoE Session Limiting on Inner QinQ VLAN feature.

Related Documents

Related Topic
Document Title

Broadband access aggregation concepts

Cisco IOS XE Broadband Access Aggregation and DSL Configuration Guide

Broadband access commands

Cisco IOS Broadband Access Aggregation and DSL Command Reference


Standards

Standard
Title

IEEE Standard 802.1Q

Virtual Bridged Local Area Networks


MIBs

MIB
MIBs Link

No new or modified MIBs are supported by this feature.

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

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


RFCs

RFC
Title

RFC 2516

PPP over Ethernet


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 Session Limiting on Inner QinQ VLAN

Table 1 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE 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 XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.

Table 1 Feature Information for PPPoE Session Limiting on Inner QinQ VLAN

Feature Name
Releases
Feature Information

PPPoE Session Limiting on Inner QinQ VLAN

Cisco IOS XE Release 2.1

The PPPoE Session Limiting on Inner QinQ VLAN feature provides the ability to limit the number of PPPoE over QinQ, (IEEE 802.1Q VLAN tunnel) sessions based on the inner VLAN ID configured under a subinterface. In 12.2(31)SB2, this feature was introduced on the Cisco 10000 router.

The following command was modified by this feature: session per-vlan limit.


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