Link termination frames are used when a link is being closed down, with messages such as Terminate-Request and Terminate-Ack. Then, both devices send and receive data. At that stage, messages such as Echo-Request and Echo-Reply are first used to test the link. Link maintenance happens while the link is open. This is where messages like Configure-Request and Configure-Ack are exchanged. Link configuration occurs during the initial link establishment phase of a link. used to terminate a link if available resources exceed requirementsĮach frame corresponds to a life phase of a PPP link.used to estimate optimal data packet size and manage and debug a link.used to establish and configure a link, and to verify peer identification.In total, there are 11 LCP frame types defined in the main PPP document. Each LCP frame is encapsulated in the payload field of the PPP frame. LCP is used to control the PPP link by sending special LCP messages across the physical link between sending and receiving devices the messages are called LCP packets or frames. use the connection to exchange packets. Once PPP establishes the connection, higher-layer protocols - IP, Internetwork Packet Exchange, etc. If a link is closed down abnormally, due to the loss of a carrier signal, for example, LCP does any necessary cleanups.The link is terminated by NCP and LCP messages.It sends IP packets and frames across the link.
#Tcp ip over serial ppp series
The source establishes the network layer protocol by sending a series of NCP messages.Both ends exchange LCP messages to determine the links to be used.
#Tcp ip over serial ppp serial
It checks the connection to see whether it's good enough to sustain data transmission at the intended rate. The LCP packet either accepts or rejects the identity of its linked peer, agrees upon packet size limits and looks for common misconfiguration errors.
LCP is considered a data link layer protocol because it works at the data link layer (Layer 2) of the Open System Interconnection networking reference model.īefore establishing communications over a point-to-point link, each end of the PPP link sends out LCP packets. In a communications link, the devices using PPP employ multiple LCP frames to conduct LCP operations. In computer networking, Point-to-Point Protocol ( PPP) provides a standard way to transport multiprotocol data over point-to-point links within PPP, Link Control Protocol (LCP) establishes, configures and tests data link internet connections.
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