Configuring Flex Links

Flex Links are a pair of a Layer 2 interfaces (switchports or port channels), where one interface is configured to act as a backup to the other.

This feature provides an alternative solution to the Spanning Tree Protocol (STP), allowing users to turn off STP and still provide basic link redundancy. You generally configure Flex Links in networks where customers do not want to run STP on the switch. When you configure STP on the switch, it is not necessary to configure Flex Links because STP already provides link-level redundancy or backup.

For more information about flex links, see the Cisco Nexus 9000 Switch NX-OS Layer 2 Switching Configuration Guide.

https://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-installation-and-configuration-guides-list.html/

Enabling Flex Link

Enabling Flex Link

POST http://<mgmt0_IP>/api/mo/sys/fm.json

{
  "fmEntity": {
    "children": [
      {
        "fmFlexlink": {
          "attributes": {
            "adminSt": "enabled"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <fm-items>
    <flexlink-items>
      <adminSt>enabled</adminSt>
    </flexlink-items>
  </fm-items>
</System>

Note: This example was added in Release 9.2(3).

CLI Commands

The CLI commands are equivalent to the payload examples displayed in the pane on the right. Click the DME tab in the top-left corner of the right pane to view the JSON payload. Click the YANG tab to view the XML payload.

feature flexlink

Note: The property information for this example was added in Release 9.3(3).

Verifying a DME Configuration
The following table contains the distinguished name (DN) for each managed object (MO) in the DME payload. Issue a GET request using the DN to verify the configuration was posted or to get information about the configured properties of a particular object.

MO	DN
fmEntity	sys/fm
fmFlexlink	sys/fm/flexlink

fmFlexlink Properties

The following table contains information about the fmFlexlink properties in the DME payload. For more information about the properties and MOs, see the NX-API DME Model Reference linked in the Related Documentation section below.

Property Name	Data Type	Description	Values
adminSt	fm:AdminState (scalar:Enum8)	Admin status	SELECTION: 1 - enabled 2 - disabled DEFAULT: disabled

Related Documentation

For other CLI options, see the Cisco Nexus 9000 Series NX-OS Command Reference:

http://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-command-reference-list.html

See the NX-API DME Model Reference for detailed information about classes and attributes described in the payload:

https://developer.cisco.com/site/nx-os/docs/nexus-model-reference/

For information about using the payloads, see the Cisco Nexus 9000 Series NX-OS Programmability Guide:

https://www.cisco.com/c/en/us/support/switches/nexus-9000-series-switches/products-programming-reference-guides-list.html

Disabling Flex Link

Disabling Flex Link

POST http://<mgmt0_IP>/api/mo/sys/fm.json

{
  "fmEntity": {
    "children": [
      {
        "fmFlexlink": {
          "attributes": {
            "adminSt": "disabled"
          }
        }
      }
    ]
  }
}

{
    imdata:[]
}

<System>
  <fm-items>
    <flexlink-items>
      <adminSt>disabled</adminSt>
    </flexlink-items>
  </fm-items>
</System>