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A Cisco 7500 series router displays the %RSP-3-RESTART: cbus complex error message
A cbus complex occurs when the router needs to recarve its packet memory (known as MEMD). All the interface processors are reloaded. Each IP downloads its microcode from the Route Switch Processor (RSP), which causes a traffic interruption of approximately two minutes.
One after another, the interface microcodes are downloaded, so the length of the interruption depends on the number of interfaces in the router. The packet memory recarve causes a short traffic interruption of a few seconds.
This message is displayed when a cbus complex occurs: