User manual

7 LAPB and X.25 configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
7-10 Nortel Networks Inc. Issue 5.3 (
30 March 2009)
Configuration procedures
No. Procedure
1 Configuring the link layer protocol of an interface as LAPB
2 Configuring LAPB parameters
3 Checking the configuration
7.2.2 Configuring the link layer protocol of an interface as LAPB
Do as follows on the routers.
Step 1 Run:
system-view
The system view appears.
Step 2 Run
interface serial interface-number
The interface view appears.
Step 3 Run:
link-protocol lapb [ dte | dce ] [ ip | multi-protocol ]
The command configures the link layer protocol of an interface as LAPB.
By default, when the link layer protocol of an interface is LAPB, the interface works in DTE
mode.
----End
7.2.3 Configuring LAPB parameters
Do as follows on the interfaces enabled with LAPB:
Step 1 Run:
system-view
The system view appears.
Step 2 Run
interface serial interface-number
The view of the interface whose link layer protocol is LAPB appears.
Step 3 Run:
lapb modulo { 128 | 8 }
The command configures LAPB frame numbering mode, also called modulus.
Step 4 Run: