In the Cisco Application Centric Infrastructure (ACI) architecture, the Bridge Group (BG) concept is equivalent to a traditional VLAN in a networking context. 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 BDI is a logical interface that allows bidirectional flow of traffic between a routed interface and a bridge group within the same network. It’s a routed interface that represents a set of interfaces that are bridged.
A BVI, on the other hand, is used in bridging environments where you want to enable IP connectivity to the bridge group. The BVI provides a means to route traffic between different VLANs.
In terms of their relationship, a Bridge Group can contain one or more BDIs or BVIs. The BDI or BVI allows the Bridge Group to communicate with other Bridge Groups or with routed interfaces. In essence, the BDI or BVI provides the “gateway” for the Bridge Group’s Layer 2 traffic to be routed.
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.
The Preferred Group (PG) feature allows you to specify a set of EPGs that are part of the same VRF to allow full communication between them with no need for contracts to be created.
A normal EPG is classified based on a VLAN and a leaf interface from which the packet came in. In the case of L3Out, the classification of the traffic in the L3Out EPG is based on prefix matching.
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.
Information About Bridge Domain Interface. 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.
The BD is where users will define their Anycast Gateway/subnet which would provide the default gateway for their host attached to the fabric. EPGs are associated to a single bridge domain (BD) and used to define security zones within a BD. EPGs define both forwarding and security segmentation at the same time.
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.
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