Direct Connection Of Two Routers Through Serial Interfaces (Two Mappings) - 3Com MSR 50 Series Configuration Manual

Direct Connection of
Two routers through
Serial Interfaces (Two
Mappings)
# Assign an IP address for the interface.
[RouterB-Serial2/0] ip address 202.38.60.2 255.255.255.0
# Configure the link layer protocol of the interface as X.25, and specify it to
operate in DCE mode.
[RouterB-Serial2/0] link-protocol x25 dce
#Assign an X.121 address for the interface.
[RouterB-Serial2/0] x25 x121-address 20112452
# Configure address mapping to the peer.
[RouterB-Serial2/0] x25 map ip 202.38.60.1 x121-address 20112451
# Configure the maximum packet size allowed and the window size.
[RouterB-Serial2/0] x25 packet-size 1024 1024
[RouterB-Serial2/0] x25 window-size 5 5
[RouterB-Serial2/0] shutdown
[RouterB-Serial2/0] undo shutdown
Note that, since IP to X.121 mapping is available, IP addresses of both ends can be
on different network segments and no static route is needed.
Network requirements
As shown in the following figure, two routers are connected directly; IP packets
can be transmitted between serial interfaces over X.25 link layer protocol. Two IP
to X.121 mappings are available on Router A.
Network diagram
Figure 72 Direct connection of two routers via serial interfaces (X.25)
S 2/0
202 .38.160 .1/24
X 121 address: 20112451
Router A
Configuration procedure
1 Configure RouterA
# Enter interface view.
<RouterA> system-view
[RouterA] interface serial 2/0
# Assign an IP address for the interface.
[RouterA-Serial2/0] ip address 202.38.160.1 255.255.255.0
# Configure the link layer protocol as X.25 and the interface to operate in DTE
mode.
X.25 Configuration Examples
S2/0
202 .38.160.2/24
X121 address: 20112452
Router B
317