Cisco 800M Series Configuration Manual page 4

Information About Configuring Serial Interfaces
When an interface is configured with PPP encapsulation, a link is declared down and full LCP
Note
negotiation is re-initiated after five echo request (ECHOREQ) packets are sent without receiving an echo
response (ECHOREP).
PPP provides the following Network Control Protocols (NCPs) for negotiating properties of data
protocols that will run on the link:
IP Control Protocol (IPCP) to negotiate IP properties
•
Multiprotocol Label Switching control processor (MPLSCP) to negotiate MPLS properties
•
Cisco Discovery Protocol control processor (CDPCP) to negotiate CDP properties
•
• IPv6CP to negotiate IP Version 6 (IPv6) properties
• Open Systems Interconnection control processor (OSICP) to negotiate OSI properties
Cisco 800M Series Integrated Services Routers Software Configuration Guide
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Chapter 4 Configuring the Serial Interface