3com 3031 Instruccion De Instalación

C

HAPTER

 26: X.25 

AND

 LAPB C

ONFIGURATIONS

X.25 interface supplementary parameter configurations include:

■

Configure the time delay of X.25 layer 3 timer

■

Configure the attributes related to X.25 address, including the following 
configuration items:

■

Configure the alias of interface address

■

Configure ignoring the calling or called address

■

Enable/Disable checking the address code block in call accepting packet

■

Enable/Disable carrying the address code block in call accepting packet

■

Configure default upper layer protocol

■

Disable the restart of X.25 layer 3

It's necessary to configure certain supplementary X.25 parameters in some special 
network environments. The session is related to these supplementary parameters.

X.25 protocol defines a series of timers to facilitate its procedure. After X.25 sends 
a control message, if it does not receive the response before the timeout of the 
corresponding timer, X.25 protocol will take corresponding measure to handle this 
abnormal event. The names and corresponding procedures of these timers are 
shown in the following table.

T28 is “Registration request sending" timer that is only defined on DTE side for 
dynamically requesting the network for optional services or stopping these 
services. Its reference value is 300 seconds, which can not be changed.

Perform the following configuration in Interface View.

Restore the default size of the 
maximum receiving and sending 
packets, that is, 128.

Table 355   Setting the default traffic control parameter

Table 356   X.25 Layer 3 timer

Reboot

T20

T10

Call

T21

T11

Reset

T22

T12

Clear

T23

T13

Register

T28

Table 357   Setting X.25 layer 3 timer delay

Set the timer delay value of restart procedure

Restore the default delay of the timer for rebooting procedure, 
which is 180 seconds at DTE side and 60 seconds at DCE side.

Set the timer delay value of call procedure