If three consecutive packets are not received, the link is declared down. The DTE side echos this sequence number back to the DCE proving connectivity. The DCE side of the connection sends the DTE side a keepalive packet containing a sequence number. HDLC uses keepalives to monitor connectivity with the remote end device. HDLC is a layer 2 protocol used for WAN connectivity. 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. Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data over synchronous serial links.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |