Configuring an X.25 subinterface
An X.25 subinterface is a virtual interface with a separate protocol address and virtual circuit.
You can create multiple subinterfaces on a physical interface to connect multiple networks. All subinterfaces on the main interface share an X.121 address with the main interface. X.25 subinterfaces fit into point-to-point subinterfaces and point-to-multipoint subinterfaces. A point-to-point subinterface connects a single remote end, and a point-to-multipoint subinterface connects multiple ones, which must be on the same network segment.
To configure an X.25 subinterface:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter main interface view. | interface serial interface-number | N/A |
3. Enable X.25. | link-protocol x25 | N/A |
4. Return to system view. | quit | N/A |
5. Create an X.25 subinterface. | interface serial interface-number.subnumber [ p2mp | p2p ] | p2mp applies by default. |
If the link layer protocol of an interface is LAPB, HDLC, or PPP, no subinterface can be created on it.