Remote Peer Scenarios During Negotiation of PPP Options

During a PPP configuration request, if any of the primary or secondary DNS option is rejected, or if they are unacceptable, the customer premises equipment (CPE) is prompted to negotiate the Internet Protocol Control Protocol (IPCP) primary and secondary DNS options that are locally available with the Broadband Remote Access Server (B-RAS). This provision is controlled by CLI and SNMP configuration options.

The following describes the peer negotiations in different scenarios:

The Link Control Protocol (LCP) state machine stores the various phases through which an IPCP negotiation and link establishment occurs. When an IPCP configuration request is received from a CPE in the closed state (such as an IPCP request with an IP address of 0.0.0.0 received from the CPE) at the provider edge (PE) device, the LCP negotiation moves to the stopped state and the PE device does not send a NAK packet to the CPE.

After an IP interface is created, which occurs when the PPP link is in the opened state and the PE device receives an open event, a Receive-Configure-Request (Bad) or RCR– event is sent to the CPE. This event occurs only if the previous event from the CPE was a close event or a bad IPCP configuration request was received. The RCR– event causes the configuration request and configuration NAK packets to be sent from the PE to the CPE device.

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