User manual

Nortel Secure Router 8000 Series
Configuration -WAN Access 7 LAPB and X.25 configuration
Issue 5.3 (
30 March 2009) Nortel Networks Inc. 7-41
0 input errors, 0 CRC, 0 frame errors
0 overrunners, 0 aborted sequences, 0 input no buffers
DCD=DOWN DTR=DOWN DSR=DOWN RTS=DOWN CTS=DOWN
----End
Configuration files
z
Configuration file of Router A
#
sysname RouterA
#
interface Serial1/0/0
link-protocol lapb dte ip
lapb modulo 128
lapb window-size 127
ip address 202.38.160.1 255.255.255.0
#
return
z
Configuration file of Router B
#
sysname RouterB
#
interface Serial1/0/0
link-protocol lapb dce ip
lapb modulo 128
lapb window-size 127
ip address 202.38.160.2 255.255.255.0
#
return
7.8.2 Example for directly connecting two routers by Using X.25
Networking requirements
As shown in Figure 7-11, if you directly connect two routers back to back, the X.25 protocol
is encapsulated between the serial interfaces for IP data packet transmission.
Figure 7-11 Direct connection of two routers through serial interface (X.25)
Router A
Router B
Serial1/0/0
202.38.160.1/24
Serial1/0/0
202.38.160.2/24
Configuration roadmap
The configuration roadmap is as follows:
1. Allocate IP addresses to the serial interfaces on Router A and Router B.
2. Configure the protocol type on each interface to X.25 and configure the X121 address.