Upstream PPPoX Connection Speed Transfer at LAC

First Published: May 2, 2005
Last Updated: November 20, 2009

The Upstream PPPoX Connection Speed Transfer at LAC feature allows the transfer of the upstream PPPoX session speed value at the Layer 2 Tunnel Protocol (L2TP) access concentrator (LAC). This transfer is accomplished by configuring the required speed on the ATM virtual circuit (VC) carrying the PPPoX session and then transferring this information into attribute-value (AV) pair 38 for transport from the LAC to the L2TP network server (LNS).

Note PPPoX is a term used to refer to PPPoE, PPPoA, and PPPoEoA. All are implementations of PPP over various delivery protocols such as Ethernet and ATM.

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 Upstream PPPoX Connection Speed Transfer at LAC" 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 Upstream PPPoX Connection Speed Transfer at LAC

•Restrictions for Upstream PPPoX Connection Speed Transfer at LAC

•Information About Upstream PPPoX Connection Speed Transfer at LAC

•How to Configure Upstream Connection Speed Transfer at LAC

•Configuration Examples for Upstream PPPoX Connection Speed Transfer at LAC

•Additional References

•Feature Information for Upstream PPPoX Connection Speed Transfer at LAC

Prerequisites for Upstream PPPoX Connection Speed Transfer at LAC

•You must understand the concepts described in the Preparing for Broadband Access Aggregation module.

•You must establish PPPoE sessions using the procedures in the Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions module.

Restrictions for Upstream PPPoX Connection Speed Transfer at LAC

The following restrictions apply to the Upstream PPPoX Connection Speed Transfer at LAC feature:

•For PPPoE, all sessions over the same VC must have the same send and receive speed.

•The upstream speed is informational and does not imply any policing or shaping of the session speed.

Information About Upstream PPPoX Connection Speed Transfer at LAC

To configure the Upstream PPPoX Connection Speed Transfer at LAC feature, you should understand the following concepts:

•Upstream PPPoX Connection Speed Transfer at LAC

•Benefits of Upstream PPPoX Connection Speed Transfer at LAC

Upstream PPPoX Connection Speed Transfer at LAC

The send speed from the LAC to the remote destination is copied into AV pair 38 so that the session is symmetric at the LNS. The LNS does not do any policing of the upstream rate but verifies the session speed against the Service Level Agreement (SLA) before accepting it.

The transfer of the upstream PPPoX session speed at the LAC is done by:

•Configuring the required speed on the ATM virtual circuit carrying the PPPoX session.

•Transferring the information to AV pair 38 for transport from the LAC to the LNS.

Figure 1 shows how the Upstream PPPoX Connection Speed Transfer at LAC feature works.

Figure 1 Upstream PPPoX Connection Speed Transfer at LAC

Benefits of Upstream PPPoX Connection Speed Transfer at LAC

The Upstream PPPoX Connection Speed Transfer at LAC feature enables the configuration of an upstream PPPoX session speed, which is different from the downstream speed and allows the transfer of the upstream speed value from the LAC to the LNS. The default state (before this feature is enabled) is that the upstream speed and the downstream speed are the same. This feature implements changes that allows asymmetry in the upstream and downstream speeds.

This feature provides the following benefits:

•Allows support for asymmetric broadband service speeds such as asymmetric digital subscriber line (ADSL).

•Complies with RFC 2661 for L2TP.

•Is required for regulatory compliance in certain European countries; for example, Germany.

How to Configure Upstream Connection Speed Transfer at LAC

This section contains the following procedures:

•Configuring Upstream PPPoX Connection Speed Transfer at the LAC (required)

•Configuration Examples for Upstream PPPoX Connection Speed Transfer at LAC (optional)

Configuring Upstream PPPoX Connection Speed Transfer at the LAC

The tasks in this section configure upstream PPPoX connection speed transfer at the LAC on a PVC or VC:

•Configuring Upstream PPPoX Connection Speed Transfer at LAC on a PVC (required)

•Configuring Upstream PPPoX Connection Speed Transfer at LAC on VC (required)

Configuring Upstream PPPoX Connection Speed Transfer at LAC on a PVC

Perform this task to configure the Upstream PPPoX Connection Speed Transfer feature at the LAC on a PVC.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface atm slot/port.[subinterface-number {mpls | multipoint | point-to-point}]

4. range [range-name] pvc start-vpi/start-vci end-vpi/end-vci

5. rx-speed incoming-cell-rate

6. exit

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  

interface atm slot/port.[subinterface-number 
{mpls | multipoint| point-to-point}]
Example:

Router(config)# interface atm 2/0.1 multipoint

Enters subinterface configuration mode.

Step 4 

range [range-name] pvc start-vpi/start-vci end-vpi/end-vci

Example:

Router(config-subif)# range pvc 0/100 0/110

Enters PVC-in-range configuration mode.

Step 5 

rx-speed incoming-cell-rate

Example:

Router(config-if-atm-range)# rx-speed 128

Allows L2TP to send AV pair 38 with the given value to LNS.

•The valid range for incoming-cell-rate for L2TP AVP is from 0 to 44209 kb/s.

Step 6  

exit
Example:

Router(config-if-atm-range)# exit

Exits PVC-in-range configuration mode.

Configuring Upstream PPPoX Connection Speed Transfer at LAC on VC

Perform this task to configure the Upstream PPPoX Connection Speed Transfer at LAC on a VC.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface atm slot/port.[subinterface-number {mpls | multipoint | point-to-point}]

4. pvc [name] {vpi/vci | vci} [ces | ilmi | qsaal | smds | l2transport]

5. rx-speed incoming-cell-rate

6. encapsulation {aal2 | aal5auto | aal5autoppp virtual-template number [group group-name] | aal5ciscoppp virtual-template number | aal5mux protocol | aal5nlpid | aal5snap}

7. exit

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  

interface atm 
slot/port.[subinterface-number{mpls | 
multipoint | point-to-point}]
Example:

Router(config)# interface atm 2/0.1 multipoint

Enters subinterface configuration mode.

Step 4  

pvc [name] {vpi/vci | vci} [ces | ilmi | qsaal 
| smds | l2transport]
Example:

Router(config-subif)# pvc pvc1 0/100

Enters PVC-class configuration mode.

Step 5 

rx-speed incoming-cell-rate

Example:

Router(config-if-atm-vc)# rx-speed 128

Allows L2TP to send (AV) pair 38 with the given value to LNS.

Step 6  

encapsulation {aal2 | aal5auto | aal5autoppp 
virtual-template number [group group-name] | 
aal5ciscoppp virtual-template number | aal5mux 
protocol | aal5nlpid | aal5snap}
Example:

Router(config-if-atm-vc)# encapsulation aal5snap

Configures Logical Link Control (LLC) Subnetwork Access Protocol (SNAP) encapsulation on the PVC.

Step 7  

exit
Example:

Router(config-if-atm-vc)# exit

Exits PVC-class configuration mode.

Configuration Examples for Upstream PPPoX Connection Speed Transfer at LAC

This section provides the following configuration example:

•Configuring Upstream PPPoX Connection Speed Transfer at LAC: Example

Configuring Upstream PPPoX Connection Speed Transfer at LAC: Example

The following examples show how to configure the upstream PPPoX connection speed transfer at LAC in PVC, range PVC, and PVC-in-range modes.

PVC Class 

interface atm 6/0.110 multipoint

 pvc 0/600

 rx-speed 128

  encapsulation aal5snap

  exit

Range PVC 

interface atm 6/0.110 multipoint

 range range-pppoa-1 pvc 100 4/199

  rx-speed 400

 exit

PVC-in-Range 

interface atm 6/0.110 multipoint

  range range1 pvc 100 4/199

 pvc-in-range 0/300

 rx-speed 200

 shutdown

Additional References

The following sections provide references related to the upstream PPPoX connection speed transfer.

Related Documents

Related Topic
Document Title

Configuring VC classes

"Configuring VC Classes" section in the "Configuring ATM" module in the Cisco IOS Wide-Area Networking Configuration Guide.

Understanding the Unspecified Bit Rate+ (UBR+) service category for ATM VCs

"Understanding the UBR+ Service Category for ATM VCs" module in ATM (Asynchronous Transfer Mode) Technical Support

Broadband access aggregation concepts

Understanding Broadband Access Aggregation module

Preparing for broadband access aggregation task

Preparing for Broadband Access Aggregation module

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

Cisco IOS Broadband Access Aggregation and DSL Command Reference

Cisco IOS commands

Cisco IOS Master Commands 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

RFC 2661

Layer 2 Tunneling Protocol "L2TP"


Technical Assistance

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Link

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http://www.cisco.com/cisco/web/support/index.html


Feature Information for Upstream PPPoX Connection Speed Transfer at LAC

Table 1 lists the release history for this feature.

For information on a feature in this technology that is not documented here, see the "Configuring Broadband Access Aggregation Features Roadmap."

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 Upstream PPPoX Connection Speed Transfer at LAC

Feature Name
Releases
Feature Information

Upstream PPPoX Connection Speed Transfer at LAC

12.2(15)B
12.2(4)T
12.2(33)SRE

The Upstream PPPoX Connection Speed Transfer at LAC feature allows the transfer of the upstream PPPoX session speed value at the LAC.

The following sections provide information about this feature:

•"Information About Upstream PPPoX Connection Speed Transfer at LAC" section

•"How to Configure Upstream Connection Speed Transfer at LAC" section

The following command was introduced:
rx-speed.


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