The SMI on Switches
Each switch implements a special management port, port 0. This is the only switch port that implements a Transport Layer as it is the only switch port that implements QPs. Those QPs are QP0 (the SMI) and QP1 (the GSI). Switch port 0 has some other special qualities:
It is typically implemented as a strictly internal port with no Physical Layer.
It is the only switch port that is assigned a LID address by the SM. It should be noted that although a base LID address is assigned to switch port 0 by the SM, this port does not implement the PortInfo.LMC field, so it cannot be assigned a range of LID addresses.
The other switch ports are not addressable and merely act as conduits for receiving and forwarding packets. When a switch ...
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