Network Layer Overview

The Network Layer logic is implemented in routers and CAs (not in switches) and, in a router, is responsible for routing packets (both unicast and multicast) between IBA subnets. Some characteristics of the Network Layer:

  • The specification does not define multi-protocol routing (i.e., routing IBA packets over non-IBA fabric types), nor does it specify how raw packets are routed between IBA subnets.

  • SMPs do not transit routers (because subnet management occurs at the subnet level).

  • The packet's ICRC (Invariant CRC) field covers the packet fields that are not altered as the packet is routed through the fabric.

  • The packet's VCRC (Variant CRC) field covers all the fields of a packet, including those that may be changed by switches ...

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