
Gathering Useful Information for a Layer 2 VLT Fabric
To gather useful information for a layer 2 VLT fabric before you begin:
• Obtain the CSV file that contains the system MAC addresses, service tag and serial numbers for each switch
provided from Dell manufacturing or manually enter this information.
• Obtain the location of the switches, including the rack and row number from your network administrator or network
operator.
• Obtain the remote Trivial File Transfer Protocol (TFTP) / File Transfer Protocol (FTP) address from your network
administrator or network operator. To specify a TFTP/FTP site, go to Administration > Settings >TFTP/FTP screen. For
information about which software packages to use, see the Release Notes.
• Download the software image for each type of switch in the fabric. Each type of switch must use the same version of
the software image within the fabric. Place the software images on the TFTP/FTP site so that the switches can install
the appropriate FTOS software image and configuration file.
• Obtain the Dynamic Host Configuration Protocol (DHCP) server address to use for the fabric from your DHCP
network administrator or network operator. If a remote DHCP server is not available, AFM also provides a local
DHCP. The DHCP server must be in the same subnet where the switches are located. After you power cycle the
switches, the switches communicate with the DHCP server to obtain a management IP Address based on the system
MAC Address. The DHCP server contains information about where to load the correct software image configuration
file for each type of switch from the TFTP/FTP site during BMP. For information about BMP, see DHCP Integration.
• Obtain the pool of IP addresses for the management port for each switch in the fabric.
• Obtain IP addresses (must be an even number) for the uplink configuration from the ISP service. The uplink port
number range is based on the whether a 10 Gb or 40 Gb bandwidth is selected.
– For a 10 Gb bandwidth, AFM supports 2 to 32 uplinks.
– For a 40 Gb bandwidth, AFM supports 2 to 8 uplinks.
Obtain IP addresses or VLAN ID for the downlink configuration for connecting to the server or ToR.
• Gather protocol configuration for uplinks and downlinks.
Selecting a Layer 2 and Layer 3 with Resiliency (Routed VLT) Fabric Design
For workload migration over virtualized environments, use a Layer 2 VLT fabric design. Use the Layer 3 with Resiliency
(Routed VLT) fabric to extend equal cost multi-pathing capabilities.
The AFM supports the following Layer 2 VLT and Layer with 3 with Resiliency (Routed VLT) fabric designs:
• 1 Tier for 10 Gb and 40 Gb ToR for Layer 2 and Layer 3 Resiliency (Routed VLT)
• 2 Tier and 3 Tier Topologies for 1 Gb ToR VLT Deployment for Layer 2 and Layer 3 with Resiliency (Routed VLT)
• 10 Gb or 40 Gb Top of Rack Deployment (mVLT)
• 2 and 3 Tier 10 Gb ToR (mVLT) Deployment Topologies for Layer 2 or Layer 3 with Resiliency
• 10 Gb Blade Switch (MXL) for Layer 2 and Layer 3 with Resiliency (Routed VLT)
For information about tiers, see Deployment Topology See also Deployment Topology Use Cases.
For more information about VLT, see:
• Overview of VLT
• Key Core Design Considerations for VLT
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