A bridge domain must include a set of logical interfaces that participate in Layer 2 learning and forwarding. You can optionally configure a VLAN identifier and a routing interface for the bridge domain to also support Layer 3 IP routing.
To include one or more logical interfaces in the bridge domain, specify an interface-name for an Ethernet interface you configured at the [edit interfaces] hierarchy level.
There are two supported ways to configure an IRB with bridge domains. One way is to use the interface-mode trunk statement. The other way is shown here and is known as the encapsulation method. The encapsulation method is the preferred way to configure an IRB with bridge domains. To configure the bridge domains on all three routers:
Like a virtual LAN (VLAN), a bridge domain spans one or more ports of multiple devices. On Juniper Networks MX Series 5G Universal Routing Platforms only, you can configure one or more bridge domains to perform Layer 2 bridging.
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 traffic. Bridge domain interfaces are identified by the same index as the bridge domain. Each bridge domain represents a Layer 2 broadcast domain.
Bridge groups provide a method to group two or more ports into a single broadcast domain, where as VLAN provide a method to group many ports into a single broadcast domain or establish a number of broadcast domains (or secure groups) on a single switch.
Layer-2 bridging works by putting one physical and one virtual Ethernet adapter into a mode where they can receive traffic that is not destined for their address. This traffic is selectively sent onto the other network according to the IEEE 802.1D standard, known as, "bridging" the frames.
An IRB is a special type of Layer 3 virtual interface named vlan . Like normal Layer 3 interfaces, the vlan interface needs a logical unit number with an IP address.
The bridge interface is a function that accommodates multiple interfaces in one virtual interface and bridges those interfaces. Each accommodated interface connected to a physical segment is handled as one segment.
The simplest way to enable routing between the two VLANs to simply connect an additional port from each VLAN into a Router. The Router doesn't know that it has two connections to the same switch — nor does it need to. The Router operates like normal when routing packets between two networks.
The VLAN & Bridge application allows you to configure groups of ports independent of their physical location as a virtual LAN. This arrangement is called a logical grouping the logical group is called a virtual LAN (VLAN). Ports or groups of ports in a VLAN are called VLAN members.
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A network bridge is a Link Layer device which forwards traffic between networks based on MAC addresses and is therefore also referred to as a Layer 2 device. It makes forwarding decisions based on tables of MAC addresses which it builds by learning what hosts are connected to each network.
A Bridge is a device that connects two LANs and controls data flow between them. A Switch is a networking device that learns which machine is connected to its port by using the device's IP Address. Bridges divide collision domain into two parts. Bridges can create collision domains but not broadcast domains.
A bridge domain is a set of logical interfaces that share the same flooding or broadcast characteristics. Layer 2 logical interfaces are created by defining one or more logical units on a physical interface with encapsulation as ethernet-bridge or vlan-bridge. All the member ports of the bridge domain participate in Layer 2 learning and forwarding. You can configure one or more bridge domains on ACX Series routers to perform Layer 2 bridging. The Layer 2 bridging functions of ACX Series routers include integrated routing and bridging (IRB) support for Layer 2 bridging and Layer 3 IP routing on the same interface. IRB enables you to route packets to another routed interface or to another bridge domain that has a Layer 3 protocol configured
A bridge domain cannot have two or more logical interfaces that belong to the same physical interface. A bridge domain with dual VLAN ID tag is not supported. The maximum number of supported input VLAN maps with TPID swap is 64. MAC learning cannot be disabled at a logical interface level.
Bridge domains require a method to learn MAC addresses. This is done via a learning domain. A learning domain is simply a MAC forwarding database. Bridge domains by default have a single learning domain, but it’s possible to have multiple learning domains per bridge domain, as shown in Figure 2-30.
A single learning domain per bridge domain is the system default. When a bridge domain is configured with a single learning ...