3Com 10014299 manual Configure Frame Relay local virtual circuit number, Fr dlci, Undo fr

Configure Frame Relay 251

The map created through the dynamic inverse ARP has broadcast attribute.

6Configure Frame Relay Local Virtual Circuit Number

Perform the following configurations in synchronous serial interface view.

Table 281 Configure Frame Relay local virtual circuit number

Operation	Command
Assign a virtual circuit number to Frame Relay interface	fr dlci	dlci-number
Remove the virtual circuit number of Frame Relay	undo fr	dlci dlci-number
interface

After entering the DLCI view through the fr dlci command, the user can configure the parameters associated with this virtual circuit, such as Frame Relay class.

The virtual circuit number is valid locally, that is, the virtual circuit numbers on both ends of the link can be the same. Different interfaces can be assigned with the same virtual circuit number, but the virtual circuit number must be unique on one physical interface.

When the Frame Relay interface type is DCE or NNI, the interface (either main interface or sub-interface) should be configured manully with virtual circuits. When the Frame Relay interface type is DTE, for the main interface, the system will determine the virtual circuit automatically according to the opposite equipment; the sub-interface must be configured with virtual circuits manually.

7Configure Frame Relay Sub-Interface

The Frame Relay interface is a kind of NBMA (Non-Broadcast Multi-Access) interface, which supports sub-interfaces. The Frame Relay module has two types of interfaces: main interface and sub-interface. The sub-interface is logical interface and can be used to configure protocol address and virtual circuit. One physical interface can include multiple sub-interfaces, which do not exist physically. However, for the network layer, both the sub-interface and main interface can be used to configure the virtual circuit to connect to remote equipment.

The sub-interfaces of Frame Relay fall into two types: point-to-point sub-interface, used to connect a single remote object and point-to-multipoint sub-interface, used to connect multiple remote objects in the same network segment.

The address mapping relation between the frame-relay sub-interfaces can be configured manually, or dynamically established by using the inverse ARP. For a point-to-point sub-interface, you only need configure one PVC on this sub-interface, since there is only one peer device. For a point-to-multipoint sub-interface, you can configure multiple PVCs. Each PVC can establish the address mapping with its connected peer through running the inverse dynamic ARP. Thereby, different PVCs can reach their peers without confusing. Alternatively, you can respectively establish different static address mapping for these PVCs.

a Creating Frame Relay Sub-Interface

In the interface view, perform the following task to create a sub-interface.

Table 282 Create Frame Relay sub-interface

Operation	Command
Enter interface view	interface type number