Nortel Networks 8000 - Manual (Page 228)

Nortel Secure Router 8000 Series
Configuration -WAN Access 7 LAPB and X.25 configuration
An X.25 interface has its X.121 address and inter-network protocol (such as IP) address.
When X.25 initiates a call through this interface, the source address (calling DTE
address) carried in the call request packet is the X.121 address of this interface.
For a datagram with a definite destination IP address, you locate its corresponding X.121
destination address by the configured address mapping. The called destination, similar to
a calling source, also has its own protocol address and X.121 address.
Set up the mapping between the destination protocol address and the X.121 address at
the calling source, and you can find the destination X.121 address according to the
destination protocol address, and successfully initiate a call. Therefore, it is necessary to
create address mapping for X.25.
m
NOTE
• The protocol-address and x.121-address in the command line refer to the protocol address and X.121
address of the destination, and not the addresses of the source.
• An address mapping should be created for every destination.
• When creating an address mapping, specify its attributes with the options. The meanings and
specific content of these options are described in subsequent sections.
• To implement TCP/IP header compression, configure the compressedtcp parameter.
For examples of address mapping, refer to the following sections:
• Creating a PVC
You create a PVC for large-traffic and stable data transmission on leased line. PVCs do
not need any call process. It is not necessary to create address mapping before creating
the PVC, because the address mapping is created automatically after the PVC is created.
The format of this command shows that while a PVC is created, an address mapping is
also created for it.
Similar to the address mapping, the protocol-address and x.121-address in the command
also refer to the destination address. When creating a PVC, certain attributes of the PVC
can also be selected with the option. This [option] is a subset of [option] in the x25
map..... [option] command.
7.4.3 Configuring supplementary parameters of X.25 datagram
Transmission
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:
x25 timer idle minutes
The command configures the maximum idle time for all the SVCs on the interface.
Step 4 Run:
Issue 5.3 (30 March 2009) Nortel Networks Inc. 7-25