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X2T PVC configuration example
Network requirements
As shown in Figure 151, the router connects X.25 and IP networks together.
In this connection, the X.25 terminal communicates with the router through PVC and the X2T
technology applied on the router enables the communication between the IP host and the X.25
terminal.
Figure 151 Network diagram
Configuration procedure
# Enable X.25 switching.
<Router> system-view
[Router] x25 switching
# Configure interface Serial 2/0.
[Router] interface serial 2/0
[Router-Serial2/0] link-protocol x25 dce
[Router-Serial2/0] x25 vc-range in-channel 10 20 bi-channel 30 1024
[Router-Serial2/0] quit
# Configure interface Ethernet 1/1.
[Router] interface ethernet 1/1
[Router-Ethernet1/1] ip address 10.1.1.1 255.255.255.0
[Router-Ethernet1/1] quit
# Configure an X2T route.
[Router] translate ip 10.1.1.1 port 102 pvc serial2/0 1
Troubleshooting LAPB configuration
LAPB (or X.25) of two sides always being down
Symptom
Link layer protocol LAPB (or X.25) of two sides is always down.
Analysis
A possible reason is the two sides are operating in the same mode (DTE or DCE).
Solution
Enable the debugging on both sides. If one side sends SABM frames and the other sends FRMR
frames cyclically, the two sides are operating in the same mode (DTE or DCE). Change the operating
mode of one side to solve it.
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