Configuring An X.25 Interface; Configuring The Basic Parameters Of An X.25 Interface - HPE FlexNetwork MSR Series Comware 5 Layer 2 - Wan Access Configuration Manual

Step
Configure LAPB parameter
6.
N1.
Configure LAPB parameter
7.
N2.
Configure the system timers
8.
T1, T2, T3, and T4 for LAPB.
Configure LAPB to initiate
9.
link renegotiation when
receiving an unsolicited
response frame with the
Final bit set to 1.

Configuring an X.25 interface

Configuring the basic parameters of an X.25 interface

Introduction to basic X.25 interface parameters
•
X.121 address
If the device is used for X.25 switching, this task can be skipped. If it is connected to an X.25
public packet network, set an X.121 address for the connected X.25 interface according to the
requirements of the ISP. As defined in ITU-T recommendation X.121, an X.121 address is a
string of 1 to 15 numbers.
•
X.25 operating mode
Layer 3 of X.25 supported by your device can operate in either DTE mode or DCE mode. The
format of the datagram is alternative, either IETF or nonstandard.
An X.25 public packet switching network requires the device to access the network as a DTE
and datagrams to be encapsulated with the IETF format generally. The operating mode of X.25
should be DTE and the encapsulation format should be IETF. When two routers are connected
back to back through serial interfaces, make sure that they are using the same encapsulation
format and are operating as the DTE and DCE, respectively.
Command
lapb max-frame n1-value
lapb retry n2-value
lapb timer { t1 t1-value | t2
t2-value | t3 t3-value | t4 t4-value }
lapb pollremote
314
Remarks
Optional.
The default N1 is calculated
according to the MTU, the upper
layer protocol, and the modulus
value.
You can configure this command
only when LAPB carries the upper
layer protocol X.25.
Optional.
The default setting is 10.
Optional.
By default:
•
T1 is 3000 milliseconds.
•
T2 is 1500 milliseconds.
•
T3 is 0 seconds.
•
T4 is 0 seconds.
Optional.
By default, LAPB does not initiate
link renegotiation when receiving
unsolicited response frames with
the Final bit set to 1.
As likelihood exists that some
response frames received with
the Final bit set to 1 are falsely
treated as unsolicited response
frames, Hewlett Packard
Enterprise recommends that you
use the default setting to prevent
link flapping caused by false link
renegotiations that result.