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How Framed-IP-Address and Framed-Pool Attributes Work for IPv4 PPP Subscribers

If a Framed-IP-Address attribute is returned from the RADIUS server during authentication and on-demand IP address allocation is enabled, then the BNG does not go to the RADIUS server for address allocation on the first Internet Protocol Control Protocol (IPCP) negotiation. It uses the Framed-IP-Address attribute returned in the initial Access-Accept message. Accounting-Start and periodic Interim-Accounting messages include the Framed-IP-Address attribute. Immediate Interim Accounting messages are not sent to RADIUS server. Address allocation is similar to the process described for a static or dynamic subscriber.

If a Framed-Pool attribute is returned from the RADIUS server during authentication and on-demand IP address allocation is enabled, then the border network gateway (BNG) does not go to the RADIUS server for address allocation upon first IPCP negotiation and it allocates an IPv4 address from the specified local address pool. Accounting-Start and periodic Interim-Accounting messages do not include the Framed-IP-Address attribute until IPCP negotiation. Immediate Interim Accounting messages (if configured) are sent to the RADIUS server. Address allocation is similar to the process described for a static or dynamic subscriber.

When neither the Framed-IP-Address attribute nor the Framed-Pool attribute is returned from the RADIUS server during authentication for IPv4-only PPP subscribers and on-demand IP address allocation is enabled, address allocation is similar to the process described for a static or dynamic subscriber. Because IPCP is the only Network Control Protocol (NCP) active for these subscribers, the entire PPP session is terminated upon an IPCP terminate request and an Accounting-stop message is sent to the RADIUS server. Immediate Interim-Accounting messages to release the IPv4 address are not sent in this case.

When a Framed-IP-Address is returned from the RADIUS server during authentication and the customer premises equipment (CPE) does not negotiate IPCP, the IPv4 address is not released whether or not the on-demand IP address allocation is enabled.

The on-demand configuration does not take effect when the destination (peer) IP address is statically configured in the inet family of the PPP interface.