3com MSR 20-20 참조 매뉴얼

C

HAPTER

 26: LAPB 

AND

 X.25 C

ONFIGURATION

 C

OMMANDS

modifications, you can first delete this address mapping via the undo x25 map 
command, and then establish one new address mapping.

Two or more address mappings with an identical protocol address shall not exist 
on the same X.25 interface.

display x25 map, x25 reverse-charge-accept, x25 call-facility, x25 timer 
idle, x25 vc-per-map.

# Set two address mappings on the X.25 interfaces Serial2/1 and Serial2/0, 
respectively, and the four address mappings have different attributes.

<Sysname> system-view

[Sysname] interface serial 2/1

[Sysname-Serial2/1] x25 map ip 202.38.160.11 x121-address 20112451 reverse-c

harge-request reverse-charge-accept

[Sysname-Serial2/1] x25 map ip 202.38.160.138 x121-address 20112450 packet-s

ize 512 512 idle-timer 10

[Sysname-Serial1/0] quit

[Sysname] interface serial2/0

[Sysname-Serial2/0] x25 map ip 20.30.4.1 x121-address 25112451 window-size 4

4 broadcast

[Sysname-Serial2/0] x25 map ip 20.30.4.8 x121-address 25112450 no-callin 

x25 modulo { 8 | 128 }

Interface view

8: Uses modulo 8 mode.

128: Uses modulo 128 mode.

Use the x25 modulo command to set the modulo mode of the X.25 interface.

Use the undo x25 modulo command to restore the default.

The default is modulo 8 mode.

The slip window is the basis for X.25 traffic control, and the key about the slip 
window is that the sent packets are numbered cyclically in order and are to be 
acknowledged by the peer end. The order in numbering refers to the ascending 
order, like “...2, 3, 4, 5, 6...” “Cyclically” means that the numbering starts again 
from the beginning when a certain number (called modulo) is reached. For 
example, when the modulo is 8, the numbering goes “...4, 5, 6, 7, 0, 1..."

X.25 defines two numbering modulo: 8 (also called the basic numbering) and 128 
(also called extended numbering).