August 2008
Intermediate to advanced
816 pages
22h 27m
English
book
The All-New Switch Book: The Complete Guide to LAN Switching Technology, Second Edition
by Rich Seifert, James Edwards
Content preview from The All-New Switch Book: The Complete Guide to LAN Switching Technology, Second Edition
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A.1. Frame Format
A received frame is assumed to be in the format displayed in Figure 1.
Figure A.1. Figure 1 Format of received frame
All lengths shown are in bytes. The LLC fields shown are present only if the Type/Length field indicates Length (i.e., < 0x0SDC). The SNAP fields are present only if the LLC DSAP and SSAP fields indicate SNAP encapsulation (i.e., 0xAA). If the frame is VLAN-tagged, the tag is inserted between the source address and the Type/Length field; the decision tree operates on the fields shown, now shifted in position by the length of the VLAN tag.