- Preparing for Broadband Access Aggregation
- Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions
- PPP for IPv6
- DHCP for IPv6 Broadband
- Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions
- Providing Connectivity Using ATM Routed Bridge Encapsulation over PVCs
- PPPoE Circuit-Id Tag Processing
- Configuring PPP over Ethernet Session Limit Support
- PPPoE Session Limit Local Override
- PPPoE QinQ Support
- PPP-Max-Payload and IWF PPPoE Tag Support
- PPPoE Session Limiting on Inner QinQ VLAN
- PPPoE Agent Remote-ID and DSL Line Characteristics Enhancement
- Enabling PPPoE Relay Discovery and Service Selection Functionality
- Configuring Cisco Subscriber Service Switch Policies
- AAA Improvements for Broadband IPv6
- Per Session Queueing and Shaping for PPPoEoVLAN Using RADIUS
- 802.1P CoS Bit Set for PPP and PPPoE Control Frames
- PPP over Ethernet Client
- PPPoE Smart Server Selection
- Monitoring PPPoE Sessions with SNMP
- PPPoE on ATM
- PPPoE on Ethernet
- PPPoE over VLAN Enhancements Configuration Limit Removal and ATM Support
- ADSL Support in IPv6
- Broadband IPv6 Counter Support at LNS
- PPP IP Unique Address and Prefix Detection
- PPP IPv4 Address Conservation in Dual Stack Environments
- Broadband High Availability Stateful Switchover
- Broadband High Availability In-Service Software Upgrade
- Controlling Subscriber Bandwidth
- PPPoE Service Selection
- Disabling AC-name and AC-cookie Tags from PPPoE PADS
PPP for IPv6
- Finding Feature Information
- Information About PPP for IPv6
- How to Configure PPP for IPv6
- Configuration Examples for PPP for IPv6
- Additional References
- Feature Information for PPP for IPv6
Finding Feature Information
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.
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.
Information About PPP for IPv6
Accounting Start and Stop Messages
PPP calls a registry to allow DHCPv6 to append the delegated prefix information to accounting start and stop messages. When accounting is configured for a DHCPv6 pool, accounting interim packets are sent to broadband sessions after binding is provided from the pool.
Forced Release of a Binding
The DHCPv6 server maintains an automatic binding table in memory to track the assignment of some configuration parameters, such as prefixes between the server and its clients. The automatic bindings can be stored permanently in the database agent, which can be, for example, a remote TFTP server or local NVRAM file system.
DHCPv6 invokes a routine when the virtual interface used by PPP terminates. This routine automatically releases any delegated prefix bindings associated with the PPP virtual interface that is being terminated.
When a PPP virtual interface terminates, the routine runs through the full table of DHCPv6 bindings checking for the matching interface. Because PPP uses a virtual interface, this subroutine clears any related lease information when the PPP connection terminates.
 Note | In IPv6 broadband deployment using DHCPv6, you must enable release of prefix bindings associated with a PPP virtual interface using the ipv6 dhcp binding track ppp command. This ensures that DHCPv6 bindings are tracked together with PPP sessions, and in the event of DHCP REBIND failure, the client initiates DHCPv6 negotiation again. |
Delegated-IPv6-Prefix
The Delegated-IPv6-Prefix attribute calls DHCPv6 to parse and store AAA attribute information. PPP sends the accounting start and stop messages for PPP sessions.
The following is an example of a Delegated-IPv6-Prefix attribute:
cisco-avpair = ipv6:delegated-prefix=2001:DB8::/64
Note | The Delegated-IPv6-Prefix attribute does not support the Cisco VSA format. If you try add this attribute in the cisco-vsa format in the profile, the RADIUS server response fails. Use only the IETF attribute for Delegated-IPv6-Prefix. |
PPP IPv6 Accounting Delay Enhancements
This feature enhances accounting records for dual-stack networks. It ensures that a unique IPv6 address is assigned to PPP IPv6 and IPv4 sessions for IP addresses that are received from RADIUS.
When this feature is enabled, it automatically creates a database to hold new incoming access-accept responses from RADIUS. The access-accept responses in this database are then checked for duplicates of a specific set of attributes. If the attributes are already present in the database, then the RADIUS server has already offered them to an existing session; therefore, the new session is immediately removed and a stop-record message sent. If none of the specific set of attributes are in the database, they are immediately added to the database, and the session proceeds normally. When the session is removed, the entries in the database are also removed.
The following RADIUS attributes are tracked in the database and checked at access-accept time:
Framed-IPv6-Prefix
Delegated-IPv6-Prefix
The attributes are available as standard RFC-defined binary format, or as Cisco VSAs. (The Delegated-IPv6-Prefix attribute currently does not have a VSA definition in AAA.)
How to Configure PPP for IPv6
- Enabling the Sending of Accounting Start and Stop Messages
- Removing Delegated Prefix Bindings
- Configuring PPP IPv6 Accounting Delay Enhancements
Enabling the Sending of Accounting Start and Stop Messages
1.
enable
2.
configure
terminal
3.
ipv6
dhcp
pool
poolname
4.
accounting
mlist
DETAILED STEPS
Removing Delegated Prefix Bindings
Perform this task to release any delegated prefix bindings associated with the PPP virtual interface that is being terminated.
1.
enable
2.
configure
terminal
3.
interface
type
number
4.
ipv6
dhcp
bindings
track
ppp
DETAILED STEPS
Configuring PPP IPv6 Accounting Delay Enhancements
1.
enable
2.
configure
terminal
3.
ppp
unique
address
access-accept
DETAILED STEPS
Configuration Examples for PPP for IPv6
Example: Enabling the Sending of Accounting Start and Stop Messages
This example shows how to enable a device to send accounting start and stop messages.
Device(config)# ipv6 dhcp pool pool1 Device(config-dhcp)# accounting list1
Additional References
Related Documents
Related Topic |
Document Title |
|---|---|
|
IPv6 addressing and connectivity |
IPv6 Configuration Guide |
|
Cisco IOS commands |
|
|
IPv6 commands |
Cisco IOS IPv6 Command Reference |
|
Cisco IOS IPv6 features |
Standards and RFCs
Standard/RFC |
Title |
|---|---|
|
RFCs for IPv6 |
|
MIBs
|
MIB |
MIBs Link |
|---|---|
|
|
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Technical Assistance
Description |
Link |
|---|---|
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for PPP for IPv6
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 |
|---|---|---|
|
PPP Enhancement for Broadband IPv6 |
Cisco IOS XE Release 2.5 |
IPv6 supports this feature. The following commands were introduced or modified: accounting, ipv6 dhcp bindings track ppp, ipv6 dhcp pool. |
|
PPP IPv6 Accounting Delay Enhancements |
Cisco IOS XE Release 3.2S |
IPv6 supports this feature. The following commands were introduced or modified: ppp unique address accept-access. |
|
SSO/ISSU Support for Per-User IPv6 ACL for PPP Sessions |
Cisco IOS XE Release 3.2.1S |
IPv6 supports this feature. No commands were introduced or modified. |
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