LCP uses echo requests and responses to monitor the continuing availability of the link. PPP also provides a Link Control Protocol (LCP) for negotiating properties of the link.
SERIAL NUMBER PROGRAM BENGKEL 2.0 SERIAL
PPP is a standard protocol used to send data over synchronous serial links. When the encapsulation on a serial interface is changed from HDLC to any other encapsulation type, the configured serial subinterfaces on the main interface inherit the newly changed encapsulation and they do not get deleted.Ĭisco HDLC uses keepalives to monitor the link state, as described in the “Keepalive Timer” section. Note Cisco HDLC is the default encapsulation type for the serial interfaces. Cisco HDLC is the default for data encapsulation at Layer 2 (data link) of the Open System Interconnection (OSI) stack for efficient packet delineation and error control. Cisco HDLC also provides a simple control protocol called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. To configure serial interfaces, you should understand the following concept:Ĭisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links. Information About Configuring Serial Interfaces Indicates that loopback is not configured. Indicates that the hardware loopback status is configured on the serial interface.
Indicates the interface status and shows that line protocol is up. Table 4-2 LEDs on the Serial WAN Module LED Name
SERIAL NUMBER PROGRAM BENGKEL 2.0 SERIES
Table 4-2 describes the LEDs on the Cisco 800M series serial WAN module. Table 4-1 Smart Serial Cabling for Cisco 800M Series ISRs Product Number Information about the cables supported by Cisco 800M Series ISRs are provided in Table 4-1.
The Cisco 800M Series Integrated Services Router (ISR) provides serial WAN connectivity to remote sites using Cisco High-Level Data Link Control (HDLC), Point-to-Point Protocol (PPP), or Frame Relay encapsulation through the pluggable, serial WAN interface module. Information About Configuring Serial Interfaces.This chapter describes configuring the serial interface for Cisco 800M Series ISRs in the following sections: