3Com 10014299 manual Configure Frame Relay interface type, Configure Frame Relay LMI protocol type

Configure Frame Relay 247

Note the following:

■The interface's link layer protocol can be configured to Frame Relay only when it operates in the synchronous mode.

■When the interface's link layer protocol is SLIP, the physical attributes of the interface cannot be modified to synchronous mode. At this time, you should first modify the link layer protocol of the interface to PPP and then you may change the interface attribute to synchronous mode.

The Frame Relay interface can send the packet in either of the Frame Relay formats, while it can recognize and receive packets in both formats. That is, even if the format of Frame Relay of opposite equipment is different from that of the local, the equipment at the two ends can communicate with each other as long as the opposite equipment can recognize the two formats automatically. But when the opposite equipment can not recognize the two formats automatically, the Frame Relays of equipment at the two ends must be set to the same format.

2Configure Frame Relay Terminal Type

In Frame Relay, the two sides in communication are classified into user side and network side. The user side is called DTE, and the network side is called DCE. The equipment response interface should be configured as DTE or DCE format according to its location in the network. In Frame Relay networks, Network-to-Network Interface (NNI) is used between the Frame Relay switches.

In the interface view, perform the following task to configure the type of Frame Relay interface as DTE, DCE or NNI.

Table 275 Configure Frame Relay interface type

Operation	Command
Configure Frame Relay interface type	fr interface-type { dte
	dce nni }
Restore the Frame Relay interface type to the default value	undo fr interface-type

The default type of Frame Relay interface is DTE.

Note the following point: If the terminal type of Frame Relay interface is changed to DCE or NNI, fr switching should be enabled in the system view.

3Configure Frame Relay LMI Type

The LMI protocol is used to maintain the PVC lists of Frame Relay protocol, including adding PVC records, deleting the records about disconnected PVCs, monitoring the change of PVC status, and verifying the link integrity. The 3Com Router supports three standard LMI protocols: LMI complying with ITU-T Q.933 Appendix A, LMI complying with ANSI T1.617 Appendix D and non-standard LMI.

In the interface view, perform the following task to configure the type of LMI protocol of Frame Relay interface.

Table 276 Configure Frame Relay LMI protocol type

Operation	Command
Configure Frame Relay LMI protocol type	fr lmi type { ansi
	nonstandard q933a } [
	bi-direction ]
Restore the Frame Relay interface LMI protocol type to	undo fr lmi type
default.