AI2524 Router Card User’s Manual
Page 12-32 August 1997
2524UM
Example: X.25 Routing
This example shows how to enable X.25 switching, as well as how to
enter routes into the X.25 routing table:
Enable X.25 forwarding:
x25 routing
Enter routes into the table. Without a positional parameter, entries ar
appended to the end of the table.
x25 route ^100$ interface serial 0
x25 route 100 cud ^pad$ interface serial 2
x25 route 100 interface serial 1
x25 route ^3306 interface serial 3
x25 route .* ip 10.2.0.2
The routing table forwards calls for X.121 address 100 out interface
serial 0. Otherwise, calls are forwarded onto serial 1 if the X.121 ad-
dress contains 100 anywhere within it and contains no CUD. Also, if
the CUD is not the string pad, calls ar e forwarded to serial 1. If the
X.121 address contains the digits 100 and the CUD is the string pad,
the call is forwarded onto serial 2. Al l X. 12 1 addresses that do not
match the first 3 routes are checked for a DNIC of 3306 as the first 4
digits. If they do match, they are forwarded over serial 3. All other
X.121 addresses will match the fifth entry, which is a m atch-all pattern
and will have a TCP connection established to the IP address 10.2.0.2.
The router at 10.2.0.2 will then route the call according to its X.25
routing table.
This example configures a router that sits on a Tymnet/PAD switch to
accept calls and have them forwarded to a DEC VAX system. This fea-
ture permits running an X.25 network over a generalized existing IP
network, thereby making another physical line for one protocol unnec-
essary. The router positioned next to the DEC VAX system is config-
ured with X.25 routes.
x25 route vax-x121-address interface serial 0
x25 route .* ip cisco-on-tymnet-ipaddress
These commands route all calls to the DEC VAX X.121 address out to
serial 0, where the VAX is connected running PSI. All other X.121 ad-
dresses are forwarded to the cisco-on-tymnet address through its IP ad-