On RUCKUS ICX devices, a Layer 3 (IP) address can be assigned to logical or virtual interfaces to enable routing and IP-based management.

Virtual Ethernet (VE): A VE is a logical Layer 3 interface that represents a specific VLAN, enabling inter-VLAN routing.

Loopback: A loopback is a virtual interface that is always active. It is commonly used for stable router identification in routing protocols (like OSPF or BGP) and for management access.

GRE tunnels: A Generic Routing Encapsulation (GRE) tunnel interface is a logical interface that encapsulates traffic over an IP network. The tunnel interface itself requires an IP address to establish the tunnel and route traffic through it.

A. Stack Interface: This is not a standard configurable Layer 3 interface. Management of a RUCKUS ICX stack is performed using an IP address assigned to a Virtual Ethernet or a dedicated management port.

B. VxLAN: VXLAN (Virtual Extensible LAN) is a Layer 2 overlay technology. While its tunnel endpoints (VTEPs) use Layer 3 addresses, the VXLAN segment (VNI) itself represents a Layer 2 domain.

C. Virtual LAN: A VLAN is a Layer 2 broadcast domain. To give it a Layer 3 presence for routing, you must create a corresponding Virtual Ethernet (VE) interface and assign the IP address to the VE.

1. Virtual Ethernet (VE): RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95 | Part Number: 53-1005930-01, Chapter 2: Configuring IP, Section: "Configuring a virtual routing interface", Page 33. "A virtual routing interface, also called a VE, is a logical Layer 3 interface that you can configure on a Layer 3 switch... You must assign an IP address to the virtual routing interface..."

2. Loopback: RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95 | Part Number: 53-1005930-01, Chapter 2: Configuring IP, Section: "Configuring a loopback interface", Page 37. "A loopback interface is a virtual interface that is always up... You can assign an IP address to a loopback interface."

3. GRE tunnels: RUCKUS FastIron Layer 3 Routing Configuration Guide, 08.0.95 | Part Number: 53-1005930-01, Chapter 10: Configuring Tunnels, Section: "Configuring a GRE tunnel", Page 218. The configuration example explicitly shows the ip address command being applied under the interface tunnel context.

4. VLAN vs. VE: RUCKUS FastIron Layer 2 Switching Configuration Guide, 08.0.95 | Part Number: 53-1005928-01, Chapter 3: Configuring VLANs, Page 43. This chapter describes VLANs as Layer 2 constructs. The Layer 3 configuration is handled by VE interfaces as documented in the Layer 3 guide.

5. Stack Management: RUCKUS FastIron Stacking Configuration Guide, 08.0.90 | Part Number: 53-1005561-01, Chapter 3: Stack Management, Section: "Stack management options", Page 37. This section details that stack management is achieved via the management port or an IP address on a VLAN (VE interface). It makes no mention of a configurable "stack-interface".