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    Fabric Management Overview

    Fabric management is responsible for setting up and managing the connections between Packet Forwarding Engines (PFEs) in a switching fabric. The switching fabric consists of Switch Interface Boards (SIBs) which provide the interconnection between the PFEs across Flexible PIC Concentrators (FPCs).

    Fabric management is event-driven. When the system is in a steady state, fabric management only collects fabric statistics periodically, monitors the health of the hardware, and responds to CLI queries. Other fabric management activity is triggered as a response to managed events and faults to minimize packet loss.

    Fabric management handles the following managed events:

    • Online and planned offline of field replaceable units (FRUs)—FPCs and SIBs are two classes of FRUs.
    • Software upgrade
    • Firmware upgrade

    Fabric management handles the following faults:

    • Hardware faults—Includes hardware errors at the link level, board level, or chassis level. These faults occur during initialization or during runtime. Temperature and voltage triggered faults, card level power brick failure, and control board failure are some examples of hardware faults.
    • Operator faults—These faults can occur during run-time or install time. Accidental removal of a functional FRU, bent pins at the mid-plane due to improper insertion of a line card, and power loss of a chassis or a FRU are some examples of operator faults.
    • Software faults—The most likely software faults that affect fabric management are process crash and restart, kernel crash and reboot, and process starvation, causing loss of control plane keep-alives.

    The following commands are used to monitor fabric management:

    • show chassis fabric fpcs—Indicates whether any fabric links are in error on the FPCs’ side.
    • show chassis fabric plane location—Displays the fabric plane location of each SIB.
    • show chassis fabric sibs—Indicates whether any fabric links are in error on the SIBs’ side.
    • show chassis fabric summary—Displays the state of all fabric planes.
    • show chassis fabric topology—Displays the input-output link topology.

    Modified: 2016-04-29