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    SFM Overview

    Inspect the SFMs to ensure that all traffic leaving the Flexible PIC Concentrators (FPCs) is handled properly.

    The SFM is a control board that handles traffic transiting the router (see Figure 1). There are two SFMs on the M40e router and four SFMs on the M160 router (see Figure 2).

    Figure 1: SFM Component

    SFM Component

    The SFMs provide route lookup, filtering, and switching. When the serial stream of bits leaves the FPC, it is directed to one of the SFMs. Each SFM effectively handles one-half or one-quarter of the traffic on each FPC. The SFMs handle a total of 160 million packets per second (Mpps) of forwarding.

    Figure 2: M40e and M160 Router SFM Location

    M40e and M160 Router
SFM Location

    The SFMs are hot-removable and hot-insertable. Inserting or removing an SFM causes a brief interruption in forwarding performance (about 500 ms) as the Packet Forwarding Engine reconfigures the distribution of packets across the remaining SFMs.


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    Published: 2012-08-20