Cisco ASR1004-20G-SEC/K9 Software Guide - Page 317
Support for IP Forwarding, Packet Forwarding, Layer 2 to Layer 3
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Chapter 11 Configuring Bridge Domain Interfaces Information About a Bridge Domain Interface • TCP • HTTP • NTP • SNMP • Telnet • TFTP Support for IP Forwarding Bridge domain interface supports the following IP forwarding features: • IPv4 input and output access control lists (ACL) • IPv4 input and output QoS policies. The operations supported for the input and output service policies on a bridge domain interface are: - Classification - Marking - Policing - Hierarchical QoS • IPv4 L3 VRFs Packet Forwarding A bridge domain interface provides bridging and forwarding services between the Layer 2 and Layer 3 network infrastructure. Layer 2 to Layer 3 During a packet flow from a Layer 2 network to a Layer 3 network, if the destination MAC address of the incoming packet matches the bridge domain interface MAC address, or if the destination MAC address is a multicast address, the packet or a copy of the packet is forwarded to the bridge domain interface. Note MAC address learning cannot not be performed on the bridge domain interface. Note In a bridge domain, when flooding unknown unicast frames, bridge domain interface is not included. Layer 3 to Layer 2 When a packet arrives at a Layer 3 physical interface of a router, a route lookup action is performed. If route lookup points to a bridge domain interface, then the bridge domain interface adds the layer 2 encapsulation and forwards the frame to the corresponding bridge domain. The byte counters are updated. OL-16506-10 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 11-3