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One of the protocols in the point to point protocol stack is the Link Control Protocol or LCP. It is responsible for establishing, maintaining, configuring and terminating the links. It also provides negotiation mechanisms to set the options between two end points. Both end points of the links must reach an agreement about the options before the establishment of the link. When PPP is carrying an LCP packet, it is either in establishing state or in the terminating state.
No user data are carrying during all these states. All LCP packets are carried in data field of the PPP frame. What defines the frame as one carrying an LCP packet is value of the protocol field, which is set to c02116. The LCP packet contains these fields: the code, the ID, length and the information. The code field defines the type of the LCP packet. The ID field holds a value that is used to match a request with the reply. One end point inserts a value in this field, which will be copied in the reply. The length field defines the length of the entire LCP packet. And the information field contains extra information needed for some LCP packets.
No user data are carrying during all these states. All LCP packets are carried in data field of the PPP frame. What defines the frame as one carrying an LCP packet is value of the protocol field, which is set to c02116. The LCP packet contains these fields: the code, the ID, length and the information. The code field defines the type of the LCP packet. The ID field holds a value that is used to match a request with the reply. One end point inserts a value in this field, which will be copied in the reply. The length field defines the length of the entire LCP packet. And the information field contains extra information needed for some LCP packets.
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