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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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Integrated Bridging and Routing

Integrated Bridging and Routing

Bridge groups connect different LANs at the link layer. Generally, LAN users that need to be interconnected belong to the same network segment or aggregated network segment. When users in a bridge group need to access another network, link-layer bridging is unsatisfactory. Integrated bridging and routing can meet these needs.

Integrated bridging and routing uses Bridge-if interfaces for routing packets. Bridge-if interfaces can be configured with network layer attributes, such as IP addresses. Each bridge group can be configured with only one Bridge-if interface. A Bridge-if interface's number is the number of the bridge group that the Bridge-if interface represents. After the integrated bridging and routing function has been activated, the Bridge-if interface can route packets between users in the bridge group and the outside network.

The integrated bridging and routing function needs to be enabled using the command line. Otherwise, all the packets in a bridge group can only be bridged, but not routed. After integrated bridging and routing has been enabled, protocol packets can either be bridged or routed, which can be configured through the command line.

After integrated bridging and routing has been enabled, the interfaces added to a bridge group cannot be configured with IP addresses.

Figure 15-7  Integrated bridging and routing network diagram

As shown in Figure 15-7, a bridge group and a Bridge-if interface are configured on Router A. Ethernet2/0/1 and Ethernet2/0/2, connecting two different LANs, are added to the bridge group. An IP address is configured for the Bridge-if interface. After the integrated bridging and routing function and the IP packet routing function have been enabled, the Bridge-if interface can route IP packets between the four hosts (PC1, PC2, PC3, and PC4) and the network outside the bridge group, and the return route is configured for Router B. That is, the four hosts can access the network outside the bridge group by using the Bridge-if interface.

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Updated: 2019-05-25

Document ID: EDOC1000097279

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