Fabric Forwarding

Fabric forwarding configuration manages VXLAN fabric-level forwarding settings on NX-OS devices, including the anycast gateway MAC address used for distributed default gateway across all VTEP leaf switches, the administrative distance for fabric routes, per-VLAN MAC address limits, and selective host probe for optimizing ARP suppression in VXLAN EVPN deployments. The anycast gateway MAC is a critical setting that must be consistent across all leaf switches in a VXLAN fabric to enable seamless host mobility and distributed routing.

Diagram

Classes

configuration (nxos.devices)

Name	Type	Constraint	Mandatory	Default Value
fabric_forwarding	Class	`[fabric_forwarding]`	No

fabric_forwarding (nxos.devices.configuration)

Name	Type	Constraint	Mandatory
anycast_gateway_mac	MAC		No
distance	Integer	min: `1`, max: `255`	No
limit_vlan_mac	Integer	min: `5`, max: `4096`	No
selective_host_probe	Boolean	`true`, `false`	No

Examples

Example 1: VXLAN leaf with anycast gateway MAC and selective host probe

nxos:
  devices:
    - name: LEAF1
      configuration:
        fabric_forwarding:
          anycast_gateway_mac: 20:20:00:00:10:12
          selective_host_probe: true

Example 2: VXLAN leaf with anycast gateway MAC and custom VLAN MAC limit

nxos:
  devices:
    - name: LEAF2
      configuration:
        fabric_forwarding:
          anycast_gateway_mac: 20:20:00:00:10:12
          limit_vlan_mac: 1024
          selective_host_probe: true

Example 3: Border leaf with anycast gateway MAC and fabric route distance

nxos:
  devices:
    - name: BORDER-LEAF1
      configuration:
        fabric_forwarding:
          anycast_gateway_mac: 20:20:00:00:10:12
          distance: 200
          selective_host_probe: true