Troubleshoot Bridge Virtual Interface & Bridge Domain Interface (2024)

FAQs

What is a bridged virtual interface? ›

Bridging virtual network interfaces allows a virtual interface to connect to an outside network through a physical interface, such as Ethernet or Thunderbolt, making it appear as a normal host to the rest of the network. Note: You can't use bridging if the physical network device used for bridging is a wireless device.

Bridge domain interface. Is a logical interface that allows bidirectional flow of traffic between a Layer-2 bridged network and a Layer-3 routed network.

A Bridge Group is essentially a Layer 2 domain where you can group together a set of related endpoints. Bridge Domain Interfaces (BDIs) and Bridged Virtual Interfaces (BVIs) are both concepts related to Bridge Groups.

A bridge domain is a set of logical ports that share the same flooding or broadcast characteristics. Like a virtual LAN (VLAN), a bridge domain spans one or more ports of multiple devices.

To bridge two or more network interfaces, we need to identify their names or interface identifiers. In this example, we could bridge the eth0 and eth1 interfaces by creating a bridge interface named br0 and adding eth0 and eth1, as shown in the examples later.

The bridge interfaces send traffic with Layer 2 addressing. On the same device, you can configure some interfaces as bridge interfaces, while other interfaces work as Layer 3 interfaces. Traffic between bridge interfaces is inspected at Layer 2.

The bridge domain defines the unique Layer 2 MAC address space and a Layer 2 flood domain if such flooding is enabled. While a VRF instance defines a unique IP address space, that address space can consist of multiple subnets.

There are generally two types of Bridges in Computer networks: Transparent Bridge. Source-Route Bridge.

A bridge group is a virtual interface that groups one or more interfaces. The main reason to group interfaces is to create a group of switched interfaces. Thus, you can attach workstations or other endpoint devices directly to the interfaces included in the bridge group.

Bridging divides a single physical LAN (now called a single broadcast domain) into two or more virtual LANs, or VLANs. Each VLAN is a collection of some of the LAN nodes grouped together to form individual broadcast domains.

What's the difference between VLAN and interface? ›

The VLAN is based on the 802.1Q VLAN, to achieve network isolation, but currently the controller cannot set up the PVID, so in fact this option is not useful at this moment. The Interface can provide more options such as set up DHCP range, and devices in different IP range can communicate with each other.

Summary: VNI is a VXLAN-specific identifier for traffic segregation in VXLAN overlays. Bridge domains are broader, used for Layer 2 forwarding and isolation in various network virtualization technologies.

Each bridge group includes a Bridge Virtual Interface (BVI). The threat defense device uses the BVI IP address as the source address for packets originating from the bridge group. The BVI IP address must be on the same subnet as the bridge group member interfaces.

Bridge mode allows your VM to act as its own device on your network, with its own IP address. This is beneficial if you're running services or applications that require direct network access, or if you want to mimic a real network environment.

BVI can replace Vlan interfaces. So instead of having a Vlan interface that routes packets (coming from acces port attached to that vlan number) that needs to be routed outside the vlan, the BVI does the same thing, routing packets outside de layer 2 domain from L2 interfaces that are bridged to that BVI.