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. 7-73

7.8.11 Example for configuring the TCP/IP header compression

Networking requirements

As shown in Figure 7-20, you directly connect two routers.

Figure 7-20 Direct connection of two routers through serial interfaces (X.25)

Router A Router B

Serial1/0/0

16.16.16.1/24

Serial1/0/0

16.16.16.2/24

Configuration roadmap

The configuration roadmap is as follows:

1. Configure the link protocol to X.25.

2. Configure the address mapping.

Data preparation

To configure the TCP/IP header compression, you need the following data:

The X.121 and the IP address of the interface on Router A are 1001 and 16.16.16.1/16.

The X.121 and the IP address of the interface on Router B are 1002 and 16.16.16.2/16.

Configuration procedures

Step 1 Configure Router A.

# Enter the interface view of Serial 1/0/0.

<RouterA> system-view

[RouterA] interface serial 1/0/0

# Encapsulate X.25 DTE.

[RouterA-Serial1/0/0] link x25 dte ietf

# Configure an X.121 address.

[RouterA-serial1/0/0] x25 x121 1001

# Configure an IP address.

[RouterA-Serial1/0/0] ip address 16.16.16.1 255.255.0.0

# Configure the map multi-protocol.

[RouterA-Serial1/0/0] x25 map ip 16.16.16.2 compressedtcp 16.16.16.2 x121-address 1002

Step 2 Configure Router B.

# Enter the interface view of Serial 1/0/0.