Bridge Domain Interface

For platforms running IOS-XE This concept is very similar to BVI .

Below are some of the common terminologies used :

Bridge domain represents a Layer 2 broadcast domain.

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.

Ethernet Virtual Circuit (EVC) is an end-to-end representation of a single instance of a Layer-2 service being offered by a provider to a customer. In the Cisco EVC Framework, the bridge domains are made up of one or more Layer-2 interfaces known as Service Instances. A Service Instance is the instantiation of an EVC on a given port on a given router. Service instance is associated with a bridge domain based on the configuration.

Creating or Deleting a Bridge Domain Interface

When you define an interface or subinterface for a Cisco IOS router, you name it and specify how it is assigned an IP address.You can create a bridge domain interface before adding a bridge domain to the system, this new bridge domain interface will be activated after the associated bridge domain is configured.

Note When a bridge domain interface is created, a bridge domain is automatically created.

When both bridge domain interface and bridge domain are created, the system maintains the required associations for mapping the bridge domain-bridge domain interface pair.

The mapping of bridge domain and bridge domain interface is maintained in the system. The bridge domain interface uses the index of the associated bridge domain to show the association.

Example Configuration from ISR4331

interface BDI100
ip address 10.12.49.254 255.255.255.0

interface GigabitEthernet0/0/0
no ip address
negotiation auto
service instance 100 ethernet
encapsulation untagged
bridge-domain 100
!
interface GigabitEthernet0/0/1
no ip address
negotiation auto
service instance 100 ethernet
encapsulation untagged
bridge-domain 100
!

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