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- User-defined
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Logical Devices (Datacenter Design)
Logical Device Overview
Logical devices are abstractions of physical devices that specify common device form factors such as number, speed and roles of ports. Vendor-specific information is not included, which lets you plan your network before selecting vendors and hardware device models. (After selecting hardware devices, logical devices are associated with physical devices with interface maps.) Logical devices are used in rack types and rack-based templates. Some applications of logical devices include:
- Specifying speed and roles for specific ports (For example, the 48th port is always a leaf, or the speed of the 10th port is always 1 Gbps).
- Preparing for port speed transformations (For example, transforming one - 40 GbE port into four - 10 GbE ports)
- Using non-standard port speeds (For example, for a 1 GbE SFP in a 10 GbE port, the underlying hardware is automatically configured correctly.)
- Solving for automatic cable map generation that takes into account failure domains on modular systems (For example, a line card).
Logical devices include the following details:
Name | Description |
---|---|
Logical device name | A unique name to identify the logical device, 64 characters or fewer |
Panel | Port layout based on IP fabric, forwarding engine, line card (slot) or physical layout. A panel contains one or more port groups. |
Port Group | A group of ports with the same speed and role(s) |
Number of ports | Number of ports in the port group |
Speed | Speed of ports in the port group |
Roles | Ports are configured to face the following types of devices:
|
From the left navigation menu, navigate to Design > Logical
Devices to go to logical devices in the global catalog. Click a
logical device name to see its details. You can create, clone, edit, and delete
logical devices.
Create Logical Device
- From the left navigation menu, navigate to Design > Logical Devices and click Create Logical Device.
- Enter a unique logical device name.
- The default panel layout consists of 24 ports (2 rows of 12 ports each). For a different layout, select the number and arrangement of ports to match your requirements by dragging from the bottom-right corner of the layout.
- Select the ports for the port group by dragging to select contiguous ports, or by clicking individual ports. Clicking a port again deselects it.
- Select port speed, and applicable role(s) for the selected ports.
- Click Create Port Group (bottom-middle) to create the port group.
- If unassigned ports remain, repeat the previous two steps until all ports are assigned. For any ports that will not be used, assign them the Unused role.
- To add a panel, click Add Panel (bottom-middle) and repeat the steps as for the first panel.
- Click Create (bottom-right) to create the logical device and return to the table view.
Example: Create Logical Device
Let's create a logical device with one panel containing one port group with 96 - 10 GbE ports and a second panel containing one port group with 8 - 40 GbE ports.
- From the left navigation menu, navigate to Design > Logical Devices and click Create Logical Device.
- A descriptive name is helpful when referring to the logical device later.
For our example we entered 96x10-8x40-2, which represents the
following characteristics:
- 96x10 - one panel with 96 - 10 GbE ports
- 8x40 - one panel with 8 - 40 GbE ports
- 2 - number of panels (rack units)
- For the port group in the first panel, drag the bottom-right corner of the
port layout to change the default 2x12 configuration to a 3x32
configuration. Leave the number of ports (96) and speed (10 Gbps) as is, and
select the Generic port role (Connected to).
- Click Create Port Group (bottom-middle), then click Add Panel (bottom-middle).
- Drag the bottom-right corner of the port layout to change the configuration to 2x4. Leave the number or ports (8) as is, change the speed to 40 Gbps, and connect them to Superspine, Spine, and Generic.
- Click Create Port Group, then click Create (bottom-right). The new logical device appears in the table view. (In the overview above, it's the first one in the table.)
Edit Logical Device
Delete Logical Device
- Either from the table view (Design > Logical Devices) or the details view, click the Delete button for the logical device to delete.
- Click Delete Logical Device to delete the logical device from the global catalog and return to the table view.