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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.
2 Configure 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
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.
3 Configure 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 interface type fr interface-type { dte |
dce | nni }
Restore the Frame Relay interface type to the default value undo fr interface-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
default.
undo fr lmi type