3com 3031 Instruccion De Instalación

High Data Link Control (HDLC) is a kind of bit-oriented link layer protocol. Its most 
prominent feature is that it can transparently transmit any kind of bit flows 
without limiting the data to be special character set. All the protocols in 
standard HDLC protocol are based upon the synchronous serial line, such as DDN. 
The address field of HDLC is 8 bytes and its control field is 8 bits, which is used to 
implement all kinds of control information of HDLC protocol and to mark whether 
they are data.

The system supports HDLC protocol encapsulation, which is compatible with 
HDLC protocols of mainstream devices in the market.

HDLC protocol configuration is very simple, and you can implement its 
configuration via two commands below.

■

Encapsulate Interface with HDLC Protocol

■

Set the polling interval

Perform the following configuration in interface view.

By default, the interface is encapsulated with PPP protocol.

Perform the following configuration in interface view.

The parameter 

 in this command is used to set the polling interval of 

status polling timer. 

 of the equipment at both ends should be set to the 

same value. Perform the following task to set the parameter 

.

By default, the value of 

 is 10s.

Table 302   Encapsulating an interface with HDLC protocol

Encapsulate interface with HDLC protocol

Table 303   Setting the polling interval

Set the polling interval, which ranges from 0 to 32767 in seconds. 
Its default value is 10s. 

 Set the polling interval to 0, i.e. disable the link detection.