As stated earlier in this chapter, when using CEF, the majority of packets are forwarded by the PFC, referencing the entries contained in the FIB, which is populated by the MSFC. However, there are certain exception packets, such as packets with IP options, that must be punted to the Route Processor (MSFC) for further processing.
While the PFC can forward up to 30 million packets per second (pps), the MSFC is typically capable of forwarding only up to 500,000 pps. This significant difference in the forwarding capabilities means that it is possible for the MSFC to be oversubscribed or . . .
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