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1 Introduction
• You need to configure as AT interfaces as many serial lines as simultaneous connections to PSTN destinations are
required without surpassing the number of modems you have. Additionally you need to create a PPP interface for
each AT interface. In the example we have two modems and assume that you wish to use both. Therefore, config-
ure line 1 and 2 as AT interfaces and add two PPP interfaces that will operate over the said AT interfaces.
• You need to create as many PPP interfaces as simultaneous connections to ISDN destinations as required without
surpassing the number of ISDN B channels you have available. In this example we have a BRI interface with two B
channels and assume that both will be used in this scenario. Therefore create two more PPP interfaces to operate
over the two BRI interface B channels. This does not mean that later we can't configure more connections (as we
are going to do, as this is the objective of dial-routing), it's simply that we are limiting those that can be simultan-
eous to two.
• Additionally, you need to configure a Dial Routing interface that manages the PSTN connections and uses the PPP
interfaces that operate over AT and another that manages the connections with ISDN destinations using the PPPs
that are configured to operate over the BRI interface.
In short, you need to configure lines 1 and 2 as AT interfaces and add four PPP interfaces and two Dial Routing.
Below you can see the result of executing the SHOW CONFIG command with the aim of getting the device configur-
ation in text mode. Further down the configuration of the interfaces is also shown so you can see which interfaces
are already available and which ones require changes.
*config
Config>show config
; Showing System Configuration for access-level 15 ...
; OA5058 Router
log-command-errors
no configuration
set data-link x25 serial0/0
set data-link x25 serial0/1
set data-link x25 serial0/2
;
;
network ethernet0/0
; -- Ethernet Interface User Configuration --
no ip address
;
exit
;
;
;
network x25-node
; -- X25-node interface configuration --
no ip address
;
exit
;
;
;
dump-command-errors
end
; --- end ---
Config>list devices
Interface
ethernet0/0
serial0/0
serial0/1
serial0/2
bri0/0
x25-node
Config>
As you can see the serial lines are in X.25 mode and therefore require changing. Additionally you do not have any
PPP interfaces or Dial Routing which means these need to be added.
The following sequence of commands shows how to execute this operation. Firstly you need to add the PPP inter-
faces.
4
Connector
Type of interface
LAN1
Fast Ethernet interface
SERIAL0/WAN1
X25
SERIAL1/WAN2
X25
SERIAL2/WAN3
X25
BRI/ISDN1
ISDN Basic Rate Int
---
Router->Node
Alcatel-Lucent Enterprise
Dial Routing
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