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11、andards Institute. Notice of Disclaimer otherwise it is reset to 0. When the IEEE 802.2 LLC payload and its header suppression are mutually agreed, the L4 data payload shall carry header of variable length as defined in Table 9.6-5: IEEE 802.2 LLC suppressed header profile 0. ATIS-0700004.a.2008 7 T
12、able 9.6-5: IEEE 802.2 LLC suppressed header profile 0 (default) Fields FORMAT L4-Flag The length of this field is 1 octet. This field defines the header suppression and presence of header field for each packet type within LLC frame. DSAP/SSAP The length of this field is 2 octets as defined in ISO/I
13、EC 8802-2. Table 9.6-6 defines whether this field shall be included in L4 packet header or not, based on the status of RAW, SNAP and Type flag bits in L4-Flag field. CTRL The length of this field is 1 octet as defined in ISO/IEC 8802-2. Table 9.6-6 defines whether this field shall be included in L4
14、packet header or not, based on the status of RAW, SNAP and Type flag bits in L4-Flag field. Type The length of this field is 2 octets as defined in ISO/IEC 8802-2. Table 9.6-6 defines whether this field shall be included in L4 packet header or not, based on the status of RAW, SNAP and Type flag bits
15、 in L4-Flag field. Vendor ID The length of this field is 3 octets as defined in ISO/IEC 8802-2. Table 9.6-6 defines whether this field shall be included in L4 packet header or not, based on the status of RAW, SNAP and Type flag bits in L4-Flag field. TOTAL Variable length ( 1 to 9 octets) When the u
16、pper layer packet is reconstructed, the packet format is estimated by using information from the L4-Flag field of the suppressed header. Reconstructed upper layer header format types are as follows: 1. RAW packet header type 2. IEEE 802.2 LLC packet header type 3. IEEE 802.2 SNAP packet header type
17、Relations of flag patterns and estimated packet header types, and presence of header fields are defined by Table 9.6-6: Relation of L4-flag patterns and presence of header fields for IEEE802.2 LLC/SNAP Payload type. ATIS-0700004.a.2008 8 Table 9.6-6: Relation of L4-flag patterns and presence of head
18、er fields for IEEE802.2 LLC/SNAP Payload type. Patterns of flags Presences of fields in L4 Header RAW SNAP TYPE Packet Header types DSAP/SSAP CTRL TYPE Vendor ID 0 0 0 IEEE 802.2 LLC Present Present - - 0 0 1 Prohibited. - - - - 0 1 0 IEEE 802.2 SNAP (TYPE=IP and Vendor ID =000000h)2No No No No 0 1
19、1 IEEE 802.2 SNAP (Vendor ID=000000h) No No Present No 1 0 0 Raw - - - - 1 0 1 Prohibited. - - - - 1 1 0 IEEE 802.2 SNAP(TYPE=IP)2No No No Present 1 1 1 IEEE 802.2 SNAP No No Present Present 9.6.3.3 IEEE 802.3/Ethernet Payload Header Suppression Profile 0 (default) (Ether-PHSP 0) When the IEEE 802.3
20、/Ethernet payload and its header suppression are mutually agreed and the PHSP number is 0 in the Payload type message, the first octet of the suppressed header is always the L4-Flag field (see Figure 9.6-4: L4-Flag field format for Ethernet Payloads). The Flag field indicates the presence of other f
21、ields to follow (see Table 9.6-8: Relation of L4-flag patterns and presence of header fields for Ethernet Payload type). msb Bits lsb 8 7 6 5 4 3 2 1 FIXED PHS BC DMA SMA RAW SNAP TYPE 0 Figure 9.6- 4: L4-Flag field format for Ethernet Payloads The FIXED bit of the L4-Flags field shall be 0. When th
22、e Payload Header Suppression (PHS) bit is set to 1, the other bits of the Flag field are defined as in Table 9.6-7: IEEE 802.3/Ethernet suppressed header profile 0. If a destination MAC address of Ethernet Payload is all FFh, the Broadcast (BC) bit of the L4-Flag field is set to 1; otherwise the BC
23、bit shall be reset to 0. 2When the TYPE field in IEEE802.2 LLC header has the value 0800h, LLC Payload carries the IP. ATIS-0700004.a.2008 9 In the IEEE 802.3/Ethernet payload header suppression default profile, the L4 data packet header has a variable length as defined in Table 9.6-7: IEEE 802.3/Et
24、hernet suppressed header profile 0. The Destination and Source MAC address of the Ethernet Payload are transmitted implicitly. Table 9.6-7: IEEE 802.3/Ethernet suppressed header profile 0 (default) Fields FORMAT L4-Flag The length of this field is 1 octet. This field defines the header suppression a
25、nd presence of header field for each packet type within Ethernet frame. Destination MAC address (DMA) The length of this field is 6 octets as defined in ISO/IEC 8802-3. Table 9.6-8 defines whether this field shall be included in the L4 packet header or not, based on the status of the BC bit and the
26、DMA flag bits in the L4-Flag field. Source MAC address (SMA) The length of this field is 6 octets as defined in ISO/IEC 8802-2. Table 9.6-8 defines whether this field shall be included in the L4 packet header or not, based on the status of SMA flag bits in the L4-Flag field. DSAP/SSAP The length of
27、this field is 2 octets as defined in ISO/IEC 8802-2. Table 9.6-8 defines whether this field shall be included in the L4 packet header or not, based on the status of RAW, SNAP and Type flag bits in the L4-Flag field. CTRL The length of this field is 1 octet as defined in ISO/IEC 8802-2. Table 9.6-8 d
28、efines whether this field shall be included in the L4 packet header or not, based on the status of RAW, SNAP and Type flag bits in the L4-Flag field. Type Table 9.6-8 defines whether this field shall be included in the L4 packet header or not, based on the status of RAW, SNAP and Type flag bits in L
29、4-Flag field. The length of this field is 1 octet as defined in ISO/IEC 8802-3 or 2 octets as defined in ISO/IEC 8802-2. Vendor ID The length of this field is 3 octets as defined in ISO/IEC 8802-2. Table 9.6-8 defines whether this field shall be included in the L4 packet header or not, based on the
30、status of RAW, SNAP and Type flag bits in the L4-Flag field. TOTAL Variable length (1 to 21 Octets) When the upper layer packet is reconstructed, the packet format is estimated with the help of the L4-Flag field (see Figure 9.6-4: L4-Flag field format for Ethernet Payloads) of the suppressed header.
31、 Reconstructed upper layer header format types are as follows: 1. Ethernet II packet header type 2. IEEE 802.3 Raw packet header type 3. IEEE 802.2 LLC packet header type 4. IEEE 802.2 SNAP packet header type ATIS-0700004.a.2008 10 The relations of flag patterns and estimated packet header types, an
32、d presence of fields per each estimated packet type are defined by Table 9.6-8: Relation of L4-flag patterns and presence of header fields for Ethernet Payload type. Table 9.6- 8: Relation of L4-flag patterns and presence of header fields for Ethernet Payload Type. Patterns of flags Presences of fie
33、lds in L4 Header RAW SNAP TYPE Estimated Packet Header types DSAP/SSAP CTRL TYPE Vendor ID 0 0 0 IEEE 802.2 LLC Present Present - - 0 0 1 Ethernet II - - Present - 0 1 0 IEEE 802.2 SNAP (TYPE=IP and Vendor ID =000000h)2No No No No 0 1 1 IEEE 802.2 SNAP (Vendor ID=000000h) No No Present No 1 0 0 IEEE 802.3 Raw - - - - 1 0 1 Prohibited. - - - - 1 1 0 IEEE 802.2 SNAP(TYPE=IP)2No No No Present 1 1 1 IEEE 802.2 SNAP No No Present Present
