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Table Of Contents
PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
Restrictions for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
Information About PPPoE over VLAN Configuration Limit Removal and ATM Support
PPPoE over VLAN Configuration Without Using Subinterfaces
PPPoE over VLAN Support on ATM PVCs
Benefits of PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
How to Configure PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface
Configuring an ATM PVC to Support PPPoE over IEEE 802.1Q VLAN Traffic
Configuring a VC Class for PPPoE over IEEE 802.1Q VLAN Support
Monitoring and Maintaining PPPoE over IEEE 802.1Q VLAN
Configuration Examples for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface: Example
Configuring PPPoE over IEEE 802.1Q VLAN Support on ATM PVCs: Example
Feature Information for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
First Published: May 2, 2005Last Updated: April 18, 2008The PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support feature provides two enhancements to PPP over Ethernet (PPPoE) over IEEE 802.1Q VLAN functionality:
•It removes the requirement for each PPPoE VLAN to be created on a subinterface. Removal of this requirement increases the number of VLANs that can be configured on a router to 4000 VLANs per interface.
•It adds ATM permanent virtual circuit (PVC) support for PPPoE over VLAN traffic that uses bridged RFC 1483 encapsulation.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. 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 over VLAN Enhancements: Configuration Limit Removal and ATM Support" section.
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
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Contents
•Restrictions for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
•Information About PPPoE over VLAN Configuration Limit Removal and ATM Support
•How to Configure PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
•Configuration Examples for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
•Feature Information for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
Restrictions for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
PPPoE over IEEE 802.1Q VLAN support can be configured without using subinterfaces on the PPPoE server only.
ATM PVC support for PPPoE over IEEE 802.1Q VLANs can be configured only on the PPPoE server.
It is not possible to shut down traffic for individual VLANs that are configured on the main interface. Individual VLANs that are configured on subinterfaces can be shut down.
A VLAN range can be configured on a main interface at the same time that VLANs outside the range are configured on subinterfaces of the same main interface. However, you cannot configure a specific VLAN on the main interface and on a subinterface at the same time.
Information About PPPoE over VLAN Configuration Limit Removal and ATM Support
To configure PPPoE over IEEE 802.1Q VLAN support on an interface rather than a subinterface, and to configure ATM support for PPPoE over IEEE 802.1Q VLANs, you should understand the following concepts:
•PPPoE over VLAN Configuration Without Using Subinterfaces
•PPPoE over VLAN Support on ATM PVCs
•Benefits of PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
PPPoE over VLAN Configuration Without Using Subinterfaces
The PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support feature removes the requirement for each PPPoE VLAN to be created on a subinterface. Allowing more than one PPPoE VLAN to be configured on a main interface increases the number of VLANs that can be configured on a router to 4000 VLANs per interface.
Individual VLANs or a range of VLANs can be configured on an interface. You can configure a VLAN range on a main interface and at the same time configure VLANs outside the range on subinterfaces of the same interface.
PPPoE over VLAN Support on ATM PVCs
The PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support feature enables ATM PVCs to process PPPoE over VLAN packets that use bridged RFC 1483 encapsulation. This capability allows PPPoE traffic from different IEEE 802.1Q VLANs to be multiplexed over the same ATM PVC.
Figure 1 shows a sample network topology that implements PPPoE over VLAN on ATM PVCs. In this topology, a service provider is using an Ethernet switch to provide Ethernet service to home users and a single PVC to provide the switch with WAN access. The home users use PPPoE to access services on the network access server (NAS). Each port on the switch is assigned a separate VLAN, and the VLANs are trunked over a Fast Ethernet or Gigabit Ethernet interface that is connected to a digital subscriber line (DSL) modem acting as a bridge.
The IEEE 802.1Q VLAN-encapsulated traffic coming in from the Ethernet switch trunk is encapsulated in RFC 1483 bridged encapsulation by the DSL modem and sent across the ATM WAN to the NAS. The NAS, which is configured to support PPPoE over VLANs over ATM PVCs, will extract the PPPoE packet from the PPPoE over IEEE 802.1Q VLAN over RFC 1483 bridged encapsulation and provide PPPoE services to the user.
In the downlink, the NAS sends packets in PPPoE over IEEE 802.1Q VLAN over RFC 1483 bridged encapsulation. The DSL modem strips off the RFC 1483 encapsulation and forwards the IEEE 802.1Q VLAN packets across the trunk to the switch. The switch then sends the Ethernet packets to the port associated with the IEEE 802.1 VLAN ID.
Figure 1 Sample Network Topology for PPPoE over IEEE 802.1Q VLANs over ATM
Benefits of PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
The PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support feature has the following benefits:
•Increases the number of VLANs that can be configured on a router to 4000 VLANs per interface by removing the requirement for each PPPoE VLAN to be configured on a subinterface.
•Provides support for PPPoE over VLANs over ATM interfaces using RFC 1483 bridged encapsulation
How to Configure PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
This section contains the following tasks. One or more of the first three tasks are required. The last task is optional.
•Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface
•Configuring an ATM PVC to Support PPPoE over IEEE 802.1Q VLAN Traffic
•Configuring a VC Class for PPPoE over IEEE 802.1Q VLAN Support
•Monitoring and Maintaining PPPoE over IEEE 802.1Q VLAN
Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface
Perform this task to configure PPPoE over IEEE 802.1Q VLAN support on an Ethernet interface.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. vlan-id dot1q vlan-id
or
vlan-range dot1q start-vlan-id end-vlan-id
5. pppoe enable [group group-name]
DETAILED STEPS
Configuring an ATM PVC to Support PPPoE over IEEE 802.1Q VLAN Traffic
Perform this task to configure an ATM PVC to support RFC 1483 bridge encapsulated PPPoE over IEEE 802.1Q VLAN traffic.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface atm number.subinterface-number {multipoint | point-to-point}
4. pvc [name] vpi/vci
5. protocol pppovlan dot1q {vlan-id | start-vlan-id end-vlan-id} [group group-name]
DETAILED STEPS
Configuring a VC Class for PPPoE over IEEE 802.1Q VLAN Support
Perform this task to configure support for PPPoE over IEEE 802.1Q VLANs in a VC class.
SUMMARY STEPS
1. enable
2. configure terminal
3. vc-class atm name
4. protocol pppovlan dot1q {vlan-id | start-vlan-id end-vlan-id} [group group-name]
DETAILED STEPS
Monitoring and Maintaining PPPoE over IEEE 802.1Q VLAN
Perform this task to monitor and maintain PPPoE over VLAN connections.
SUMMARY STEPS
1. enable
2. clear pppoe {interface type number [vc {[vpi/]vci | vc-name}] [vlan vlan-id] | rmac mac-address [sid session-id] | all}
3. debug pppoe {data | errors | events | packets} [rmac remote-mac-address | interface type number [vc {[vpi/]vci | vc-name}] [vlan vlan-id]]
DETAILED STEPS
Configuration Examples for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
•Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface: Example
•Configuring PPPoE over IEEE 802.1Q VLAN Support on ATM PVCs: Example
Configuring PPPoE over IEEE 802.1Q VLAN Support on an Ethernet Interface: Example
The following example shows how to configure PPPoE over a range of IEEE 802.1Q VLANs on Fast Ethernet interface 0/0. The VLAN range is configured on the main interface and therefore each VLAN will not use up a separate subinterface.
bba-group pppoe PPPOEvirtual-template 1sessions per-mac limit 1interface virtual-template 1ip address 10.10.10.10 255.255.255.0mtu 1492interface fastethernet 0/0no ip addressno ip mroute-cacheduplex halfvlan-range dot1q 20 30pppoe enable group PPPOEexit-vlan-configConfiguring PPPoE over IEEE 802.1Q VLAN Support on ATM PVCs: Example
The following example shows how to configure an ATM PVC to support PPPoE over a range of IEEE 802.1Q VLANs:
bba-group pppoe PPPOEOAvirtual-template 1sessions per-mac limit 1interface virtual-template 1ip address 10.10.10.10 255.255.255.0mtu 1492interface atm 4/0.10 multipointpvc 10/100protocol pppovlan dot1q range 10 30 group PPPOEOAAdditional References
The following sections provide references related to the PPPoE Over VLAN Enhancements: Configuration Limit Removal and ATM Support feature.
Related Documents
Related Topic Document TitleATM PVC configuration
"ATM" chapter of the Cisco IOS Wide-Area Networking Configuration Guide
PPPoE and PPPoE over IEEE 802.1Q VLAN configuration
"Broadband Access: PPP and Routed Bridge Encapsulation" chapter of the Cisco IOS Wide-Area Networking Configuration Guide
VLAN range configuration (using subinterfaces)
VLAN Range new-feature document for Cisco IOS Release 12.2(13)T
ATM PVC and PPPoE configuration commands
Standards
MIBs
RFCs
Technical Assistance
Feature Information for PPPoE over VLAN Enhancements: Configuration Limit Removal and ATM Support
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.
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.
Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at 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. (1005R)
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.
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