BDI

Bridge Domain Interfaces (BDI) provide Layer 3 routing capability for bridge domains, acting as the routed interface (SVI equivalent) for VXLAN or other bridging constructs. They support IP addressing, MAC address configuration, and zone-based firewall membership. BDI interfaces are essential for VXLAN fabrics where Layer 3 gateway functionality is needed for bridge domain traffic, providing a stable routed endpoint that connects overlay bridge domains to the underlay routing infrastructure.

Diagram

Classes

interfaces (iosxe.devices.configuration)

Name	Type	Constraint	Mandatory	Default Value
bdis	List	[bdis]	No

bdis (iosxe.devices.configuration.interfaces)

Name	Type	Constraint	Mandatory	Default Value
id	Integer		Yes
mac_address	Any	MAC or String[Regex: ^[0-9a-fA-F]{4}\.[0-9a-fA-F]{4}\.[0-9a-fA-F]{4}$] or String[Regex: ^.*[\$\%]\{.*$]	No
ip_mtu	Integer	min: 68, max: 18000	No

Examples

BDI with Custom IP MTU

BDI interfaces are L3 constructs and use ip mtu (L3 packet size) rather than the interface-level mtu (L2 frame size) used by physical and Port-Channel interfaces.

Cisco IOS-XE CLI Equivalent:

interface BDI100
 mac-address 0000.11AA.22BB
 ip mtu 1400

NAC YAML Configuration:

iosxe:
  devices:
    - name: Device1
      configuration:
        interfaces:
          bdis:
            - id: 100
              mac_address: 0000.11AA.22BB
              ip_mtu: 1400