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    Analyzing Virtual Chassis Fabrics

    This topic describes how to analyze Virtual Chassis Fabrics (VCFs). The Run Fabric Analyzer task analyzes a VCF and provides information about its health, connectivity, and topology. The Fabric Analyzer works on VCFs configured in spine-and-leaf mode.

    This topic describes:

    Procedure for Analyzing a Virtual Chassis Fabric

    Fabric analysis is automatically performed on managed VCFs. You do not need to manually run the analyzer.

    To see the results of the analysis of a VCF:

    1. Click Monitor in the Network Director banner.
    2. Select the VCF to analyze in the View pane.
    3. Select the Fabric Analysis tab.

    For information about using the tabs within the Fabric Analysis tab, see the following sections:

    Using the Fabric Health Check Tab

    To check the health of a VCF, select the Fabric Health Check tab on the Fabric Analysis tab in Monitor mode. The Fabric Health Check tab shows connectivity information about the VCF. Each leaf device is listed in the Leaves column, and each spine device is a table column. Each cell indicates the connectivity status between the leaf device and the spine device.

    Using the Topology Tab

    The Topology tab displays a topology diagram of the VCF as shown in Figure 1. Mouse over a member to view details of that member.

    Figure 1: Virtual Chassis Fabric Topology

    Virtual Chassis
Fabric Topology

    The details that are displayed in the top panel of the Virtual Chassis Topology view are described in Table 1.

    Table 1: Common Details for the Virtual Chassis and Virtual Chassis Fabric



    Fabric ID
    VC ID

    All members of a Virtual Chassis configuration share one Virtual Chassis identifier (VCID). This identifier is derived from internal parameters.

    Provisioning Method

    The provisioning mode of the member. Provision mode can be autoprovisioned, preprovisioned or not preprovisioned.

    Autoprovisioning a Virtual Chassis Fabric (VCF) enables you to “plug and play” devices into your VCF after minimal initial configuration.

    In a VCF, you can have two to four members configured in the Routing Engine role. Of this, one member acts as the master Routing Engine and another member acts as the backup Routing Engine. n a preprovisioned configuration, the selection of which member functions as the master Routing Engine and which as the backup Routing Engine is determined by the software based on the master-election algorithm.

    In a configuration that is not preprovisioned, the selection of the master and backup is determined by the mastership priority value and secondary factors in the master-election algorithm.

    VC Mode

    Indicates whether the Virtual Chassis is mixed or not.

    The following details are displayed in the Virtual Chassis Topology view for each member depending on the role of the member as shown in Table 2.

    Table 2: Details of VC/VCF Members





    Name of the member switch provided while configuring the device. The device name is displayed as a label.

    Line Card

    Serial Number

    Serial number of the member switch.

    Line Card


    Platform of the device. Platform can be QFX3500, QFX3600, or QFX5100.

    Line Card


    The mastership priority value. This is the most important factor in determining the role of the member switch within the Virtual Chassis configuration.

    Line Card

    Operational Role

    Operational role of the device. A device might be configured for a particular role, but can operate in the same or a different role. For example, a spine device configured with a Routing Engine role might operate as a line card. Therefore, the operational role of this device is Line Card.

    Operational role can be Routing Engine or Line Card.

    Line Card

    Config Role

    The configured role of the device. This can be Routing Engine or Line card.

    Line Card

    Member Status

    Displays the status of each member device:

    • Present—The device is connected and working fine.
    • Not Present—The device is not connected to the VC or VCF.
    • Inactive—The device is connected, but not running.
    • Non Provisioned—A configuration in which the roles of the members are assigned automatically; not configured statically (preprovisioned).
    • Pre Provisioned—A configuration that allows you to deterministically control the member ID and role assigned to a member by associating the member with its serial number.

    Line Card


    Related Documentation


    Modified: 2016-12-08