PPPoE Session Limiting on Inner QinQ VLAN

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Updated:November 9, 2006

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PPPoE Session Limiting on Inner QinQ VLAN

Table Of Contents

PPPoE Session Limiting on Inner QinQ VLAN

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

Benefits of PPPoE Session Limiting on Inner QinQ VLAN

Feature Design of PPPoE Session Limiting on Inner QinQ VLAN

How to Configure PPPoE Session Limiting on Inner QinQ VLAN

Configuring PPPoE Session Limiting on Inner QinQ VLAN

Examples

Troubleshooting Tips

Configuration Examples for PPPoE Session Limiting on Inner QinQ VLAN

PPPoE Session Limiting on Inner QinQ VLAN: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

sessions per-vlan limit

Feature Information for PPPoE Session Limiting on Inner QinQ VLAN


PPPoE Session Limiting on Inner QinQ VLAN

First Published: December 4, 2006
Last Updated: December 4, 2006

The PPPoE Session Limiting on Inner QinQ VLAN feature allows a service provider to limit each customer to one 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 in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for PPPoE Session Limiting on Inner QinQ VLAN" section.

Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

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

•Command Reference

•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 procedures:

•Configuring PPPoE Session Limiting on Inner QinQ VLAN

Configuring PPPoE Session Limiting on Inner QinQ VLAN

The following task configures PPPoE over QinQ session limiting and 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.

Step 4 

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

Example:

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

Configures inner and outer VLAN limits.

Step 5 

end

Example:

Router(config-bba-group)# end

(Optional) Exits the current configuration mode.

Examples

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

bba-group pppoe group1	

     virtual-template 1

     sessions per-vlan limit 1000 inner 1

interface eth1/0/0.1

     encapsulation dot1q 10 second-dot1q any

     pppoe enable group group1

Troubleshooting Tips

The following commands can help troubleshoot PPPoE session limiting:

•show pppoe session

•show pppoe summary

•debug pppoe error

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 the commands used to configure the PPPoE Session Limiting on Inner QinQ VLAN feature on the Cisco 10000: 

Router# show running-config

!

!

bba-group pppoe PPPOE-LIMIT

 virtual-template 1

sessions per-mac limit 1000

 sessions per-vlan limit 1000 inner 1

!

interface FastEthernet1/1.201

 description connected to Cat Switch

 encapsulation dot1Q 201

 pppoe enable group PPPOE-LIMIT

!

interface FastEthernet1/1.202

 description connected to Cat Switch

 encapsulation dot1Q 202

 pppoe enable group PPPOE-LIMIT

!

interface Virtual-Template1

 ip address negotiated

 no logging event link-status

 ppp chap hostname pppoeuser

 ppp chap password 0 cisco

!

end

The following example shows the commands used to configure a Catalyst switch (see Figure 1) to transport PPPoE over inner QinQ: 

Router# show running-config

!

!

interface FastEthernet0/1

 description connected to UUT

 switchport trunk encapsulation dot1q

 switchport trunk allowed vlan 301

 switchport mode trunk

!

interface FastEthernet0/2

 description connected to Client

 switchport access vlan 301

 switchport mode dot1q-tunnel

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 Broadband and DSL Configuration Guide, Release 12.4

Broadband access commands

Cisco IOS Broadband Access Aggregation and DSL Command Reference, Release 12.4T


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 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 Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.

http://www.cisco.com/techsupport


Command Reference

This section documents the following modified commands.

•sessions per-vlan limit

sessions per-vlan limit

To specify the maximum number of PPP over Ethernet (PPPoE) sessions permitted per VLAN ID pair in a PPPoE profile, use the sessions per-vlan limit command in BBA group configuration mode. To remove this specification, use the no form of this command.

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

no sessions per-vlan limit outer-per-vlan-limit inner inner-per-vlan-limit

Syntax Description

outer- per-vlan-limit

Maximum number of PPPoE sessions permitted per outer VLAN ID. The default is 100. Range is 1 to the maximum number of interfaces allowed on the platform.

inner inner-per-vlan-limit

Maximum number of PPPoE sessions permitted per inner VLAN ID. The default is 100. Range is 1 to the maximum number of interfaces allowed on the platform.


Defaults

Sessions: 100

Command Modes

BBA group configuration

Command History

Release
Modification

12.2(15)T

This command was introduced.

12.3(7)XI3

This command was integrated into Cisco IOS Release 12.3(7)XI3.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(31)SB

This command was integrated into Cisco IOS Release 12.2(31)SB and the inner inner-per-vlan-limit keyword and argument were added.

12.2(31)SB2

This command was integrated into Cisco IOS Release 12.2(31)SB2.


Usage Guidelines

Use the sessions per-vlan limit command to configure a PPPoE profile with the maximum number of PPPoE sessions that will be allowed per VLAN ID pair. By limiting the number of inner VLAN sessions you can reduce the number of subinterfaces required to support QinQ sessions per unique outer and inner VLAN IDs.

You cannot configure session limits in PPPoE profiles and directly on VLANs simultaneously.

You cannot configure the inner VLAN limit to be greater than the outer VLAN limit.

Examples

The following example shows a limit of 1000 PPPoE sessions per inner VLAN ID configured in the PPPoE profile named group 1: 

bba-group pppoe group1 

 virtual-template 1 

 sessions per-vlan limit 1000 inner 1

Related Commands

Command
Description

bba-group pppoe

Creates a PPPoE profile.

sessions max limit

Configures a PPPoE global profile with the maximum number of PPPoE sessions that will be permitted on a router and sets the PPPoE session-count threshold.

sessions per-mac limit

Sets the maximum number of PPPoE sessions allowed per MAC address in a PPPoE profile.

sessions per-vc limit

Sets the maximum number of PPPoE sessions to be established over a VC in a PPPoE profile and sets the PPPoE session-count threshold.


Feature Information for PPPoE Session Limiting on Inner QinQ VLAN

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.

Cisco IOS software images are specific to a Cisco IOS software release, a feature set, and a platform. Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

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 Session Limiting on Inner QinQ VLAN

Feature Name
Releases
Feature Information

PPPoE Session Limiting on Inner QinQ VLAN

12.2(31)SB2

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.

The following commands were modified by this feature: session per-vlan limit.



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

© 2006 Cisco Systems, Inc. All rights reserved.

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