Configuring Bridge Domain Interfaces
Information About Bridge Domain Interfaces
2
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
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Bridge domain interfaces do not support the following features:
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PPP over Ethernet (PPPoE)
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Hot Standby Router Protocol (HSRP)
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Virtual Router Redundancy Protocol (VRRP)
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Bidirectional Forwarding Detection (BFD) protocol
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Netflow
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Network-Based Application Recognition (NBAR) or Advanced Video Coding (AVC)
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Multicast
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For a BDI, the maximum transmission unit (MTU) size can be configured between 1500 and 9216
bytes.
Information About Bridge Domain Interfaces
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. Only one
bridge domain interface can be associated with a bridge domain.
Bridge domain interface supports the following features:
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IP termination
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Layer 3 VPN termination
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Address Resolution Protocol (ARP), G-ARP, and P-ARP handling
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MAC address assignment
Prior to configuring a bridge domain interface, you must understand the following concepts:
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Ethernet Virtual Circuit Overview, page 2
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Bridge Domain Interface Encapsulation, page 3
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Assigning a MAC Address, page 3
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Support for IP Protocols, page 3
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Support for IP Forwarding, page 4
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Packet Forwarding, page 4
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Bridge Domain Interface Statistics, page 5
Ethernet Virtual Circuit Overview
An 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. It embodies the different parameters on which the
service is being offered. 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.
An incoming frame can be classified as service instance based on the following criteria:
