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.
Feature Specifications for the PPPoE Client DDR Idle-Timer Feature
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12.2(13)T |
This feature was introduced. |
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Prerequisites for Using the 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 for links to the documents describing these concepts.
Information About the PPPoE Client DDR Idle-Timer
To configure the PPPoE client DDR idle-timer, you need to understand the following concept:
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 the PPPoE Client DDR Idle-Timer
This section contains the following procedures. Each procedure is identified as either required or optional.
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
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Step 1 |
enable
Router> enable |
Enables higher privilege levels, such as privileged EXEC mode.
- Enter your password if prompted.
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Step 2 |
configure { terminal | memory | network }
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface atm atm-interface-number
Router# interface atm 2/0 |
Configures an ATM interface type and enters interface configuration mode. |
Step 4 |
pvc vpi/vci
Router(config-if)# pvc 2/100 |
Creates an ATM permanent virtual circuit (PVC) and enters interface-ATM-VC configuration mode. |
Step 5 |
pppoe-client dial-pool-number number [ dial-on-demand ]
Router(config-if-atm-vc)# pppoe-client dial-pool-number 1 dial-on-demand |
Configures DDR interesting traffic control list functionality of the dialer interface with a PPPoE client.
- The optional dial-on-demand keyword enables DDR functionality on the PPPoE connection.
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Step 6 |
exit
Router(config-if-atm-vc)# exit |
Exits the configuration mode.
- Enter the exit command at each configuration mode to leave that mode.
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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
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Step 1 |
enable
Router> enable |
Enables higher privilege levels, such as privileged EXEC mode.
- Enter your password if prompted.
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Step 2 |
configure { terminal | memory | network }
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface ethernet ethernet-number
Router# interface ethernet 1 |
Configures an Ethernet interface and enters interface configuration mode. |
Step 4 |
pppoe enable
Router(config-if)# pppoe enable |
Enables PPPoE sessions on an Ethernet interface. |
Step 5 |
pppoe-client dial-pool-number number [ dial-on-demand ]
Router(config-if)# pppoe-client dial-pool-number 1 dial-on-demand |
Configures DDR interesting traffic control list functionality of the dialer interface with a PPPoE client.
- The optional dial-on-demand keyword enables DDR functionality on the PPPoE connection.
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Step 6 |
exit
Router(config-if-atm-vc)# exit |
Exits the configuration mode.
- Enter the exit command at each configuration mode to leave that mode.
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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
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Step 1 |
enable
Router> enable |
Enables higher privilege levels, such as privileged EXEC mode.
- Enter your password if prompted.
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Step 2 |
configure { terminal | memory | network }
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
interface dialer dialer-rotary-group-number
Router# interface dialer 1 |
Defines a dialer rotary group and enters interface configuration mode. |
Step 4 |
dialer idle-timeout seconds [ inbound | either ]
Router(config-if)# dialer idle-timeout 180 either |
Specifies the duration of idle time before a line is disconnected.
- inbound —Only inbound traffic will reset the idle timeout.
- either —Both inbound and outbound traffic will reset the idle timeout.
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Step 5 |
dialer hold-queue packets [ timeout seconds ]
Router(config-if)# dialer hold-queue 100 |
Allows interesting outgoing packets to be queued until a modem connection is established.
- timeout —Amount of time, in seconds, to queue the packets.
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Step 6 |
dialer-group group-number
Router(config-if)# dialer-group 1 |
Controls access by configuring an interface to belong to a specific dialing group. |
Step 7 |
exit
Router(config-if)# exit |
Leaves interface configuration mode and returns to global configuration mode. |
Step 8 |
dialer-list dialer-group protocol protocol-name { permit | deny | list access-list-number | access-group }
Router(config)# dialer-list 1 protocol ip permit |
Defines a DDR dialer list for dialing by protocol or by a combination of a protocol and a previously defined access list.
- permit and deny —Configure access permissions.
- list —Specifies that an access list will be used for defining a granularity finer than an entire protocol.
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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
The following example shows how to configure the PPPoE client DDR idle-timer on an ATM PVC interface:
pppoe-client dial-pool-number 1 dial-on-demand
dialer idle-timeout 180 either
dialer-list 1 protocol ip permit
ip route 0.0.0.0 0.0.0.0 Dialer1
PPPoEoE Client Configuration Example
The following example shows how to configure the PPPoE client DDR idle-timer on an Ethernet interface:
pppoe-client dial-pool-number 1 dial-on-demand
dialer idle-timeout 180 either
dialer-list 1 protocol ip permit
ip route 0.0.0.0 0.0.0.0 Dialer1
Additional References
For additional information related to the PPPoE client DDR idle-timer, refer to the following references:
MIBs
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None |
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB website on Cisco.com at the following URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://tools.cisco.com/ITDIT/MIBS/servlet/inde x
If Cisco MIB Locator does not support the MIB information that you need, you can also obtain a list of supported MIBs and download MIBs from the Cisco MIBs page at the following URL:
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http://www.cisco.com/register
Technical Assistance
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Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, tools, and lots more. Registered Cisco.com users can log in from this page to access even more content. |
http://www.cisco.com/public/support/tac/home.shtml |
Command Reference
The following modified command is pertinent to this feature. To see the command pages for this command and other commands used with this feature, go to the Cisco IOS Master Commands List, at http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html.
- pppoe-client dial-pool-number
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