3Com MSR 30, MSR 50 manual X25 modulo, Syntax x25 modulo 8 Undo x25 modulo

450CHAPTER 26: LAPB AND X.25 CONFIGURATION COMMANDS

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.

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

Example # 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

Syntax x25 modulo { 8 128 }

undo x25 modulo

View Interface view

Parameter 8: Uses modulo 8 mode.

128: Uses modulo 128 mode.

Description 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).