3Com 10014299 manual Switching Function, Configure X.25 sub-Interface, Configure X.25 Switching

Configure X.25 213

Configure X.25 X.25 sub-interface is a virtual interface with its own protocol address and virtual Sub-Interfacecircuit. Multiple sub-interfaces can be created on a physical interface, so the

networks can be interconnected via one physical interface. The sub-interface of X.25 falls into two types: point-to-point sub-interface, used to connect a single remote end and point-to-multipoint sub-interface, used to connect multiple remote ends in the same network segment. All the sub-interfaces under the main interface and the main interface share a X.121 address.

In the interface view, perform the following task to configure X.25 sub-interface.

Table 256 Configure X.25 sub-Interface

Operation	Command
Enter X.25 interface	interface serial number
Configure X.25 protocol	link-protocol x25
Create X.25 sub-interface	interface serial
	number.subinterface-number{multipoi
	ntpoint-to-point}
Configure address mapping	x25 map protocol protocol-address
Or	x121-addressx.121-address [option]
	or
Configure permanent virtual circuit
	x25 pvc pvc-number protocol
	protocol-address
	x121-addressx.121-address [option]

Configure X.25 Switching

X.25 Switching Function

A packet network consists of many nodes interconnected in a certain topological structure. From the source to its destination, a packet will pass through many nodes, each of which must have packet switching capability.

X.25 packet switching means to receive packets from one X.25 port, and send them out from the X.25 port selected according to related destination address information contained in the packets. X.25 switching enables the 3Com Router series to perform packet switching function in the packet layer, and to be used as a small packet switching exchange.

The 3Com Router series provides such X.25 switching functions as follows:

■SVC switching function

■Support parameter negotiation on window size and packet size

■PVC switching

The following describes how to configure X.25 switching tables for PVC and SVC.