Nortel Networks 8000 - Manual (Page 242)

Nortel Secure Router 8000 Series
Configuration -WAN Access 7 LAPB and X.25 configuration
• Example for configuring the X.25 load balancing
• Example for configuring the X.25 load balancing carrying IP Datagrams
• Example for configuring the TCP/IP header compression
7.8.1 Example for configuring LAPB
Networking requirements
You connect two routers through serial interfaces with the LAPB protocol encapsulated to
transmit IP datagrams directly.
Figure 7-10 Direct connection between two routers through serial interfaces (LAPB)
Serial1/0/0
202.38.160.1/24
SeriaM/0/0
20238.1602/24
Router A
Router B
Configuration roadmap
The configuration roadmap is as follows:
1. On Router A, configure the link layer protocol of the interface as LAPB and specify its
operating mode as DTE; configure other LAPB parameters such as window size and
module.
2. Configure the link layer protocol of the interface as LAPB and specify its operating
mode as DCE; configure other LAPB parameters such as window size and module.
Data preparation
To complete the configuration, you need the following data:
• The IP address of ready interface on Router A: 202.38.160.1/24; module: 128 and
window size: 127.
• The IP address of ready interface on Router B: 202.38.160.2/24; module: 128 window
size: 127.
Configuration procedure
Step 1 Configure Router A.
# Configure the interface.
<RouterA> system-view
[RouterA] interface serial1/0/0
[RouterA-Serial1/0/0] ip address 202.38.160.1 255.255.255.0
# Configure the link layer protocol of the interface as LAPB and specify its operating mode as
DTE.
[RouterA-Serial1/0/0] link-protocol lapb dte
Issue 5.3 (30 March 2009) Nortel Networks Inc. 7-39