Broadband Access Aggregation and DSL Configuration Guide, Cisco IOS Release 15M&T
Providing Session Limit Support
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Contents

Providing Session Limit Support

Last Updated: December 3, 2012

The PPP over Ethernet Session Limit feature enables you to limit the number of PPP over Ethernet (PPPoE) sessions that can be created on a router or on a Gigabit Ethernet interface for configuration.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 table at the end of this module.

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.

Information About Providing Session Limit Support

Benefits of Providing Session Limit Support

The PPPoE Session Limit feature prevents the router from using too much memory for virtual access by limiting the number of PPPoE sessions that can be created on a router or on all Ethernet interfaces and sub-interfaces as well as ATM interfaces and sub-interfaces.

How to Provide Session Limit Support

Specifying the Maximum Number of PPPoE Sessions on the Router

Perform this task to specify the maximum number of PPPoE sessions that can be created on a router.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bba-group pppoe {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.    sessions max limit number-of-sessions [threshold threshold-value]

9.    exit


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 {name | global}


Example:

Router(config)# bba-group pppoe global

 

Configures a BBA group to be used to establish PPPoE sessions and enters BBA group configuration mode.

  • name --Identifies the broadband aggregation (BBA) group. You can have multiple BBA groups.
  • global --PPPoE profile that serves as the default profile for any PPPoE port (Gigabit Ethernet interface or VLAN) that has not been assigned a specific PPPoE profile.
 
Step 4
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 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. The default is 100.

 
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 sub-interface. The default is 100.

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. The default is 100.

Note    The per-vc limit is applicable only to ATM interfaces and sub-interfaces.
 
Step 8
sessions max limit number-of-sessions [threshold threshold-value]


Example:

Router(config-bba-group)# sessions max limit 32000

 

Configures the PPPoE global profile with the maximum number of PPPoE sessions that will be permitted on a router, and sets the PPPoE session-count threshold at which a Simple Network Management Protocol (SNMP) trap will be generated.

Note    This command applies only to the global profile.
 
Step 9
exit


Example:

Router(config-bba-group)# exit

 

Returns to global configuration mode.

 

Specifying the Maximum Number of PPPoE Sessions on a Gigabit Ethernet Interface

Perform this task to specify the maximum number of PPPoE sessions that can be created on a Gigabit Ethernet interface.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface {GigabitEthernet | tenGigabitEthernet} slot / subslot / port[. subinterface]

4.    pppoe enable [group group-name]

5.    pppoe max-sessions number

6.    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
interface {GigabitEthernet | tenGigabitEthernet} slot / subslot / port[. subinterface]


Example:

Router(config)# interface GigabitEthernet0/0/1

 

Specifies a Gigabit Ethernet interface and enters interface configuration mode.

 
Step 4
pppoe enable [group group-name]


Example:

Router(config-if)# pppoe enable group one

 

Enables PPPoE sessions on a Gigabit Ethernet interface or subinterface.

Note    If a PPPoE profile is not assigned to the interface through use of the group group-name option, the interface will use the global PPPoE profile.
 
Step 5
pppoe max-sessions number


Example:

Router(config-if)# pppoe max-sessions 10

 

Specifies the maximum number of PPPoE sessions permitted on the interface or subinterface. The default value is 100.

 
Step 6
end


Example:

Router(config-if)# end

 

(Optional) Exits the configuration mode and returns to privileged EXEC mode.

 

Configuration Examples for Providing Session Limit Support

Specifying the Maximum Number of PPPoE Sessions on a Router Example

The following example shows a limit of 32,000 PPPoE sessions configured for the router:

bba-group pppoe global
  virtual-template 1
  sessions per-mac limit 1000
  sessions per-vlan limit 4000 inner 3500
  sessions per-vc limit 2000

Specifying the Maximum Number of PPPoE Sessions on a Gigabit Ethernet Interface Example

The following example shows a limit of ten PPPoE sessions on the Gigabit Ethernet interface:

interface GigabitEthernet1/0/0
  pppoe enable
  pppoe max-sessions 10

The following example shows a limit of ten PPPoE sessions on the Gigabit Ethernet subinterface using the encapsulationcommand:

interface GigabitEthernet0/0/0.1
  encapsulation dot1q 2 
  pppoe enable
  pppoe max-sessions 10

Additional References

The following sections provide references related to supporting session limits.

Related Documents

Related Topic

Document Title

Broadband access aggregation of PPPoE sessions

Understanding Broadband Access Aggregation

Task for preparing for broadband access aggregation

Preparing for broadband access aggregation

Broadband access commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Broadband Access Aggregation and DSL Command Reference

Additional information about commands used in this document

Cisco IOS Master Command List, All Releases

Standards

Standards

Title

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

--

MIBs

MIBs

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

RFCs

Title

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

--

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 Providing Session Limit Support

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 1Feature Information for Providing Session Limit Support

Feature Name

Releases

Feature Information

PPP over Ethernet (PPPoE) Session Limit

12.2(1)DX 12.2(2)DD 12.2(4)B 12.2(4)T 15.0(1)M 12.2(33)SRE

The PPP over Ethernet (PPPoE) Session Limit feature enables you to limit the number of PPPoE sessions that can be created on a router or on a Gigabit Ethernet interface for configuration.

The following commands were introduced or modified:

sessions per-mac limit, sessions per-vlan limit, sessions per-vc limit, sessions max limit, pppoe max-sessions

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: 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. (1110R)

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.

© 2012 Cisco Systems, Inc. All rights reserved.