Technical Documentation
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AAA Accounting Messages During IPCP Negotiations for Dual-Stack Subscribers
The Ipv4-release-control RADIUS VSA attribute [26-164] is supported only in Interim-Acct messages. The following sections describe the different scenarios during the negotiation of IPCP packets for IPv4 addresses and release of addresses for terminated user sessions in a dual-stack network, and the transmission of interim accounting messages between the router and the AAA server.
Interim-Acct Messages When an IPv4 Address is Assigned
The following RADIUS attributes are always included in Interim-Acct messages when an IPv4 address is assigned to a dual-stack subscriber during an IPCP negotiation:
- [55] Event-Timestamp
- [25] Class
- [97] Framed-Ipv6-Prefix
- [8] Framed-Ip-Address
- [9] Framed-Ip-Netmask
The other attributes supported in Interim-Acct messages are included, based on the user configuration settings.
Interim-Acct Messages When an IPv4 Address is Not Assigned
The following RADIUS attributes are always included in Interim-Acct messages when an IPv4 address is not assigned to a dual-stack subscriber during an IPCP negotiation:
- [55] Event-Timestamp
- [25] Class
- [97] Framed-Ipv6-Prefix
The other attributes supported in Interim-Acct messages are included, based on the user configuration settings.
The following RADIUS attributes are never included in Interim-Acct messages when IPv4 address assignment fails:
- [8] Framed-Ip-Address
- [9] Framed-Ip-Netmask
Interim-Acct Messages During a Successful IPCP Renegotiation for IPv4 Addresses
The following RADIUS attributes are always included in Interim-Acct messages upon the receipt of IPCP configuration requests for IPv4 addresses from CPE and a successful IPCP renegotiation:
- [26-164] Ipv4-release-control
- [55] Event-Timestamp
- [25] Class
- [97] Framed-Ipv6-Prefix
- [8] Framed-Ip-Address
- [9] Framed-Ip-Netmask
- [123] Delegated-Ipv6-Prefix
- [44] Acct-Session-Id
The other attributes supported in Interim-Acct messages are included, based on the user configuration settings.
Interim-Acct Messages During a Failed IPCP Renegotiation for IPv4 Addresses
The following RADIUS attributes are always included in Interim-Acct messages after the receipt of IPCP configuration requests for IPv4 addresses from CPE and a failed IPCP renegotiation:
- [26-164] Ipv4-release-control
- [55] Event-Timestamp
- [25] Class
- [97] Framed-Ipv6-Prefix
- [123] Delegated-Ipv6-Prefix
- [44] Acct-Session-Id
The other attributes supported in Interim-Acct messages are included, based on the user configuration settings.
The following RADIUS attributes are never included in Interim-Acct messages when IPv4 address assignment fails after an IPCP renegotiation:
- [8] Framed-Ip-Address
- [9] Framed-Ip-Netmask
Interim-Acct Messages When an IPv4 Address is Released
The following RADIUS attributes are always included in Interim-Acct messages when an IPv4 address is released upon the termination of a subscriber session:
- [26-164] Ipv4-release-control
- [55] Event-Timestamp
- [25] Class
- [97] Framed-Ipv6-Prefix
- [123] Delegated-Ipv6-Prefix
- [44] Acct-Session-Id
The other attributes supported in Interim-Acct messages are included, based on the user configuration settings.
The following RADIUS attributes are never included in Interim-Acct messages when an IPv4 address is released to the AAA server:
- [8] Framed-Ip-Address
- [9] Framed-Ip-Netmask
For both these attributes, even if the IP address assigned to the user is 0.0.0.0, it is discarded and not included in the accounting messages.
