October 2002
Intermediate to advanced
1280 pages
24h 35m
English
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LID's Purpose: Packet Routing Within Subnet
Assigning a LID to a port permits it to be addressed as the target of a packet. In Figure 7-2 on page 136 a packet is sent from a port on one TCA to a destination port on another TCA:
The source TCA composes the packet including a Local Route Header (LRH; see Figure 7-1 on page 135) with the DLID and SLID values set as follows:
- LRH:DLID set to one of the LID addresses assigned to the destination TCA port.
- LRH:SLID set to one of the LID addresses assigned to the TCA port sourcing the packet into the fabric.
Figure 7-1. Intra-Subnet Packet Format
The source TCA injects the packet onto the link.
The packet ...
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