Link Control Protocol: Difference between revisions

Revision as of 13:39, 4 March 2007

Revision as of 10:07, 10 March 2007

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In [[computing]], the '''Link Control Protocol''' (LCP) forms part of the [[Point-to-Point Protocol|PPP]]. In setting up PPP communications, both the sending and receiving devices send out LCP [[packet]]s to determine specific information that the prospective [[data]] transmission will require. The LCP [[Communications protocol|protocol]]:

* checks the identity of the linked device and either accepts or rejects the [[peer-to-peer | peer]] device

* determines the acceptable packet size for transmission

* searches for errors in configuration

* can terminate the link if requirements exceed the parameters

Devices cannot use PPP to transmit data over a network until the LCP packet determines the acceptability of the link, but LCP packets are embedded into PPP packets and therefore a basic PPP conectionconnection has to be stablished before LCP can reconfigure it.

The LCP over PPP packets have control code 0xC021 and their info field contains the LCP packet, which has four fields. (Code, Id, Length, Data)

* Code: Operation requested: configure link, terminate link, ... and acknowledge and deny codes.