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Langue: en

Version: 300692 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)

BSD mandoc


ng_frame_relay - frame relay netgraph node type


In netgraph/ng_frame_relay.h


The frame_relay node type performs encapsulation, de-encapsulation, and multiplexing of packets using the frame relay protocol. It supports up to 1024 DLCI's. The LMI protocol is handled by a separate node type (see ng_lmi4).

The downstream hook should be connected to the synchronous line, i.e., the switch. Then hooks dlci0 dlci1 through dlci1023 are available to connect to each of the DLCI channels.


This node type supports the following hooks:
The connection to the synchronous line.
Here X is a decimal number from 0 to 1023. This hook corresponds to the DLCI X frame relay virtual channel.


This node type supports only the generic control messages.


This node shuts down upon receipt of a NGM_SHUTDOWN control message, or when all hooks have been disconnected.


netgraph(4), ng_lmi4, ngctl(8)


The node type was implemented in Fx 4.0 .


An Julian Elischer Aq


Technically, frames on DLCI X should not be transmitted to the switch until the LMI protocol entity on both ends has configured DLCI X as active. The node type ignores this restriction, and will always pass data received on a DLCI hook to downstream Instead, it should query the LMI node first.
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