Configuring IPCP Renegotiations in a Dual-Stack Network for Optimal Utilization of Released IPv4 Addresses

You can enable the PPP application to inform the RADIUS server about released IPv4 addresses for dual-stack subscribers immediately after the address is released. You can also specify a time period during which IPCP renegotiations for IPv4 addresses that the router or the PE device receives from a subscriber is restricted. You can specify the maximum number of requests for IPv4 addresses that can be received per subscriber during the time interval configured for IPCP renegotiations to be received.

To configure IPCP renegotiations in a dual-stack network:

1. From Global Configuration mode, enable the PPP application to inform the RADIUS server about released IPv4 addresses.
   host1(config)#aaa ipv4-addr-saving address
2. From Interface Configuration mode, configure the maximum number of successful IPCP renegotiations for IPv4 addresses that the router can receive per subscriber. You can specify this value in a PPP profile or a PPP interface.
   host1(config-if)#ppp ipcp-max-negotiation 3
3. Configure the interval during which the maximum number of IPCP renegotiations for IPv4 addresses that the router receives from a subscriber must be restricted. You can configure this setting in a PPP profile or a PPP interface.
   host1(config-if)#ppp ipcp-nego-duration 400
4. Configure the interval during which additional IPCP negotiations are prevented from being received. When the time interval elapses, the subscriber must connect again to negotiate IPCP. You can configure the interval from Interface Configuration mode, Subinterface Configuration Mode, and Profile Configuration Mode.
   host1(config-if)#ppp ipcp-lockout-duration 400