122 SunFDDI/P1.0 Adapter User’s Guide—May 1997
10
DLPI Addressing
DLPI addressing is implemented as a DLSAP (data link service access point)
address. Each DLSAP consists of a physical address plus a service access point
(SAP). The format of the DLSAP is provider-dependent. Figure10-3 shows the
general format of the SunFDDI/P DLSAP.
Figure10-3 SunFDDI/P DLSAP Format
Information returned by the DL_INFO_ACK primitive (in response to a
DL_INFO_REQ) is used to specify the encoding and decoding rules to insert
and extract the DLSAP for a given data link provider.The information
returned by the SunFDDI/P device driver is shown in Table10-1.
Table10-1 DL_INFO_REQ Frame
Element Value Description
dl_max_sdu 4352 bytes Maximum MTU
dl_min_sdu 0 bytes Minimum MTU
dl_addr_length 8 bytes Length of DLSAP
dl_mac_type DL_FDDI FDDI MAC layer
dl_reserved 0 Unused
dl_current_state — Current state of data link provider
dl_sap_length -2 bytes Length of DLSAP
dl_service_mode DL_CLDLS Connectionless service
dl_qos_length 0 Not supported
TYPE
6 Bytes 2 Bytes
DSAP ORG
SSAP CTL
LLC SNAP