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Contents
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. |
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.
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.
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.
The figure below shows how the Upstream PPPoX Connection Speed Transfer at LAC feature works.
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.
The tasks in this section configure upstream PPPoX connection speed transfer at the LAC on a PVC or VC:
Perform this task to configure the Upstream PPPoX Connection Speed Transfer feature at the LAC on a PVC.
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
Perform this task to configure the Upstream PPPoX Connection Speed Transfer at LAC on a VC.
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
The following examples show how to configure the upstream PPPoX connection speed transfer at LAC in PVC, range PVC, and PVC-in-range modes.
interface atm 6/0.110 multipoint pvc 0/600 rx-speed 128 encapsulation aal5snap exit
interface atm 6/0.110 multipoint range range-pppoa-1 pvc 100 4/199 rx-speed 400 exit
interface atm 6/0.110 multipoint range range1 pvc 100 4/199 pvc-in-range 0/300 rx-speed 200 shutdown
The following sections provide references related to the upstream PPPoX connection speed transfer.
Related Topic |
Document Title |
---|---|
Configuring VC classes |
"Configuring VC Classes" section in the "Configuring ATM" module in theCisco 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 |
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 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: |
RFCs |
Title |
---|---|
RFC 2661 |
Layer 2 Tunneling Protocol "L2TP" |
Description |
Link |
---|---|
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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.
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 command was introduced:rx-speed. |