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Table Of Contents
Prerequisites for PPPoE Client DDR Idle-Timer
Information About PPPoE Client DDR Idle-Timer
DDR Functionality and the PPPoE Client
How to Configure PPPoE Client DDR Idle-Timer
Configure the PPPoE Client DDR Idle-Timer on an ATM PVC Interface
Configure the PPPoE Client DDR Idle-Timer on an Ethernet Interface
Configure the Dialer Interface
Configuration Examples for PPPoE Client DDR Idle-Timer
PPPoEoA Client Configuration Example
PPPoEoE Client Configuration Example
Feature Information for PPPoE Client DDR Idle-Timer
PPPoE Client DDR Idle-Timer
The PPPoE Client DDR Idle-Timer feature supports the dial-on-demand routing (DDR) interesting traffic control list functionality of the dialer interface with a PPP over Ethernet (PPPoE) client, but also keeps original functionality (PPPoE connection up and always on after configuration) for those PPPoE clients that require it.
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 PPPoE Client DDR Idle-Timer" section.
Use Cisco Feature Navigator to find information about platform support and Cisco 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 PPPoE Client DDR Idle-Timer
•Information About PPPoE Client DDR Idle-Timer
•How to Configure PPPoE Client DDR Idle-Timer
•Configuration Examples for PPPoE Client DDR Idle-Timer
•Feature Information for PPPoE Client DDR Idle-Timer
Prerequisites for PPPoE Client DDR Idle-Timer
Before configuring the PPPoE Client DDR Idle-Timer feature, you must understand the concept of DDR interesting packets and access control lists and PPPoE Stage Protocols. See the "Additional References" section on page 8 for links to the documents describing these concepts.
Information About PPPoE Client DDR Idle-Timer
•DDR Functionality and the PPPoE Client
DDR Functionality and the PPPoE Client
Before Cisco IOS Release 12.2(13)T, the DDR interesting traffic control list functionality of the dialer interface was not supported for PPPoE. However, the PPPoE Client DDR Idle-Timer feature, available as part of Cisco IOS Release 12.2(13)T, now supports this DDR functionality for a PPPoE client.
Protocol access lists and dialer access lists are central to the operation of DDR. Access lists are used as the screening criteria for determining when to initiate DDR calls. All packets are tested against the dialer access list. Packets that match a permit entry are deemed interesting. Packets that do not match a permit entry or that do match a deny entry are deemed uninteresting. When a packet is found to be interesting, either the dialer idle timer is reset (if the line is active) or a connection is attempted (assuming the line is available but not active). If a tested packet is deemed uninteresting, it will be forwarded if it is intended for a destination known to be on a specific interface and the link is active. However, such a packet will not initiate a DDR call and will not reset the idle timer. If dialer idle timer expires, the dialer interface calls a PPPoE function to tear down the connection.
A new command, pppoe-client dial-pool-number, allows configuring a DDR interesting traffic control list for PPPoE connections, but also keeps original connection functionality for those PPPoE clients that require it. If you do not require DDR, the PPPoE connection will be up and always on after configuration. If you do require DDR functionality, the connection will be brought up when interesting traffic comes in from the LAN interface and brought down after the dialer idle timer expires. Interesting traffic that comes from WAN interface will only reset the dialer idle timer.
Protocol access lists and dialer access lists have already been implemented in the dialer interface for the operation of DDR. For a PPPoE client, access lists are used as the screening criteria for determining if PPPoE Discovery initiation or a dialer idle timer reset is needed. But a protocol access list is not required for this feature; it depends on your network needs. An access-list can be configured and associated with dialer-list, or you can configure only the dialer list.
All packets destined to the dialer interface are tested against the dialer access list. Packets that match a permit entry are deemed interesting. Packets that do not match a permit entry or that do match a deny entry are deemed uninteresting. When a packet is found to be interesting, the dialer idle timer will be reset if the PPPoE session has already been set up, or a PPPoE Discovery will be attempted if there is no PPPoE session. If a tested packet is deemed uninteresting, it will not initiate PPPoE Discovery and will not reset the idle timer.
How to Configure PPPoE Client DDR Idle-Timer
•Configure the PPPoE Client DDR Idle-Timer on an ATM PVC Interface
•Configure the PPPoE Client DDR Idle-Timer on an Ethernet Interface
•Configure the Dialer Interface
Configure the PPPoE Client DDR Idle-Timer on an ATM PVC Interface
To configure the PPPoE client DDR idle-timer in interface-ATM-VC configuration mode, use the following commands:
SUMMARY STEPS
1. enable
2. configure {terminal | memory | network}
3. interface atm atm-interface-number
4. pvc vpi/vci
5. pppoe-client dial-pool-number number [dial-on-demand]
6. exit
DETAILED STEPS
What to Do Next
To support DDR functionality for the PPPoE client, DDR functionality must be configured. See the "Configure the Dialer Interface" section for the steps to do this.
Configure the PPPoE Client DDR Idle-Timer on an Ethernet Interface
To configure the PPPoE client DDR idle-timer on an Ethernet interface, use the following commands:
SUMMARY STEPS
1. enable
2. configure {terminal | memory | network}
3. interface ethernet ethernet-number
4. pppoe enable
5. pppoe-client dial-pool-number number [dial-on-demand]
DETAILED STEPS
What to Do Next
To support DDR functionality for the PPPoE client, DDR functionality must be configured. See the "Configure the Dialer Interface" section for the steps to do this.
Configure the Dialer Interface
To configure the dialer interface (required when using the pppoe-client dial-pool-number command), you must also configure the following commands:
SUMMARY STEPS
1. enable
2. configure {terminal | memory | network}
3. interface dialer dialer-rotary-group-number
4. dialer idle-timeout seconds [inbound | either]
5. dialer hold-queue packets [timeout seconds]
6. dialer-group group-number
7. exit
8. dialer-list dialer-group protocol protocol-name {permit | deny | list access-list-number | access-group}
DETAILED STEPS
Configuration Examples for PPPoE Client DDR Idle-Timer
This section provides configuration examples to match the identified configuration tasks in the previous sections. The dialer interface configurations for each interface type required by the pppoe-client dial-pool-number command are included in the following client configuration examples:
•PPPoEoA Client Configuration Example
•PPPoEoE Client Configuration Example
PPPoEoA Client Configuration Example
The following example shows how to configure the PPPoE client DDR idle-timer on an ATM PVC interface:
!vpdn enableno vpdn logging!vpdn-group 1request-dialinprotocol pppoe!interface ATM2/0pvc 2/100pppoe-client dial-pool-number 1 dial-on-demand!interface Dialer1ip address negotiatedip mtu 1492encapsulation pppdialer pool 1dialer idle-timeout 180 eitherdialer hold-queue 100dialer-group 1!dialer-list 1 protocol ip permit!ip route 0.0.0.0 0.0.0.0 Dialer1PPPoEoE Client Configuration Example
The following example shows how to configure the PPPoE client DDR idle-timer on an Ethernet interface:
!vpdn enableno vpdn logging!vpdn-group 1request-dialinprotocol pppoe!interface Ethernet1pppoe enablepppoe-client dial-pool-number 1 dial-on-demand!interface Dialer1ip address negotiatedip mtu 1492encapsulation pppdialer pool 1dialer idle-timeout 180 eitherdialer hold-queue 100dialer-group 1!dialer-list 1 protocol ip permit!ip route 0.0.0.0 0.0.0.0 Dialer1Additional References
Related Documents
Related Topic Document TitleCisco IOS commands
DDR interesting packets and access control lists
Cisco IOS Dial Technologies Configuration Guide, Release 12.2. See the section "Configuring Access Control for Outgoing Calls " in the chapter "Configuring Legacy DDR Hubs."
DDR and dialer commands: complete command syntax, command mode, defaults, usage guidelines, and examples
Cisco IOS Dial Technologies Command Reference, Release 12.2.
PPPoE Stage Protocols
Cisco IOS Wide-Area Networking Configuration Guide, Release 12.2. See the section "PPPoE Stage Protocols" in the chapter "Configuring Broadband Access: PPP and Routed Bridge Encapsulation."
PPPoE configuration commands: complete command syntax, command mode, defaults, usage guidelines, and example
Cisco IOS Wide-Area Networking Command Reference, Release 12.2. See the chapter "Broadband Access: PPP and Routed Bridge Encapsulation Commands."
Standards
MIBs
MIB MIBs Link•None
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:
RFCs
Technical Assistance
Feature Information for PPPoE Client DDR Idle-Timer
Table 1 lists the release history for this feature.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which 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 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.
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