Sun-microsystems 3U Manual de usuario Pagina 120

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98 SunATM 3U CompactPCI Adapter Installation and User’s Guide February 2001
The driver’s handling of packets depends on both the encapsulation method and the
operational mode. For LLC-encapsulated traffic running in dlpi mode, the driver
automatically adds the LLC header on transmit and strips the LLC header on receive
before sending the message up the dlpi mode stream. In raw mode, however, the
driver does not modify the packets at all. This includes any header included with
the packet. Thus, an application using raw mode and LLC encapsulation must
include its own headers on transmit and receives data with the LLC header intact.
Received packets are directed to application streams based on the type of
encapsulation in use. If a packet is null-encapsulated, it is sent up the stream
associated with the vpci on which the packet was received. If a packet is LLC-
encapsulated, it is sent to the stream that has bound (using atm_bind()) the SAP
found in the LLC header.
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