PPP Link Setup and Phases
(Page 3 of 3)
Differentiating LCP and NCP Links
Remember that the basic link is established by LCP, and NCP links are set up within the LCP link. Closing an NCP link does not cause the LCP link to be closed. Even if all NCPs are closed, the LCP link remains open. (Of course, no data can be passed until an appropriate NCP link is re-established; a device is required to discard frames received containing any layer three protocol that does not have an opened NCP.) To terminate a PPP connection, only the LCP link needs to be terminated in the Link Termination phase; the NCPs do not need to be explicitly closed.
A summary of PPP phases can be found in Table 24. In the table, the LCP Link Status and NCP Link Status columns show the status of the link as the phase starts.
Home - Table Of Contents - Contact Us
The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.