3com 3031 Instruccion De Instalación
Configuring Frame Relay
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Configure Frame Relay Subinterface
Configuring Data Link
Protocol of Interface as
Frame Relay
Perform the following configuration in Interface View.
By default, the interface is encapsulated with the link layer protocol PPP, and the
Frame Relay protocol is encapsulated in IETF standard format.
Frame Relay protocol is encapsulated in IETF standard format.
In the system, the IETF standard can be selected to encapsulate the frame relay
protocol in the format stipulated in RFC1490. The nonstandard compatible
encapsulation format can also be selected.
protocol in the format stipulated in RFC1490. The nonstandard compatible
encapsulation format can also be selected.
The default encapsulation format is ietf encapsulation.
The frame relay interface can send the message in either of the encapsulation
formats, while it can recognize and receive messages in both formats. That is,
even if the encapsulation 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.
formats, while it can recognize and receive messages in both formats. That is,
even if the encapsulation 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.
to the same format.
Configuring 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. In
frame relay networks, Network-to-Network Interface (NNI) is used between the
frame relay switches. If the device is used for frame relay switch, the frame relay
interface type should be configured as NNI or DCE format. The system supports
these 3 formats.
network side. The user side is called DTE, and the network side is called DCE. In
frame relay networks, Network-to-Network Interface (NNI) is used between the
frame relay switches. If the device is used for frame relay switch, the frame relay
interface type should be configured as NNI or DCE format. The system supports
these 3 formats.
Perform the following configuration in Interface View. Frame Relay interface type
can be configured as DTE, DCE or NNI.
can be configured as DTE, DCE or NNI.
The default type of frame relay interface is DTE.
Configuring 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 system
supports three standard LMI protocols: ITU-T Q.933 Appendix A, ANSI T1.617
Appendix D and nonstandard compatible protocol.
including adding PVC records, deleting the records about disconnected PVCs,
monitoring the change of PVC status, and verifying the link integrity. The system
supports three standard LMI protocols: ITU-T Q.933 Appendix A, ANSI T1.617
Appendix D and nonstandard compatible protocol.
Table 304 Configuring interface to frame relay encapsulated
Operation
Command
Configure interface encapsulation as
frame relay
frame relay
link-protocol fr [ nonstandard | ietf ]
Table 305 Configuring frame relay interface type
Operation
Command
Configure frame relay interface type
fr interface-type { dce | dte | nni }
Restore the frame relay interface type
to the default value
to the default value
undo fr interface-type