PPPoE Session Limiting on Inner QinQ VLAN

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.

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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

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.

The figure below 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

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 ActionPurpose
    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

    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

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

    Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/​go/​cfn. An account on Cisco.com is not required.
    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.