October 2002
Intermediate to advanced
1280 pages
24h 35m
English
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Packet Addressing Basics
A packet is used to send a request or a response from one CA to another. One packet's data payload field can contain a maximum of 4096 bytes of data. An adapter sending a message that is larger than a single packet's data payload field must therefore segment the message transfer into a series of two or more packets. Each packet contains a data payload field, one or two packet routing headers, CRCs, etc. Each packet contains the following address information in its routing headers:
Local Route Header (LRH) is present in every packet (see Figure 1-4 on page 15 and Figure 1-5 on page 15). Among other elements, the LRH contains:
- - Destination port Local ID (DLID). This 16-bit field is used by switches to guide the packet through ...
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