October 2002
Intermediate to advanced
1280 pages
24h 35m
English
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Packet CRCs
Invariant CRC (ICRC)
Covers All Fields That Don't Change
The 32-bit ICRC is generated by the source CA port's Link Layer and covers all packet fields that do not change (i.e., they are not altered by switches or routers) as the packet transits from the source port to the destination port. The ICRC is present in all IBA packets but not in raw packets (in a raw packet the fields that may be altered while the packet is in transit are not known). The ICRC calculation is restarted for each new packet in a message.
The header fields that may be modified by switches or routers are comprised of:
The fields that a switch may modify as the packet transits the local subnet. This would include:
- LRH:VL.
- BTH:Resv8a fields. Note that although ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.