Sun-microsystems 1.0 Uživatelský manuál stáhnout pdf (Strana 148)

122 SunFDDI/P1.0Adapter User’sGuide—May1997

DLPIAddressing

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. Figure 10-3 shows the

general format of the SunFDDI/P DLSAP.

Figure 10-3 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 Table 10-1.

Table 10-1 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

1 2 ... 143 144 145 146 147 148 149 150 151 152 153 ... 181 182

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Sun-microsystems 1.0 Uživatelský manuál Strana 148