Chapter 10 Configuring IRB on the ML-Series Card

Configuring IRB

Before configuring IRB, consider the following:

•The default routing/bridging behavior in a bridge group (when IRB is enabled) is to bridge all packets. Make sure that you explicitly configure routing on the BVI for IP traffic.

•Packets of unroutable protocols such as local-area transport (LAT) are always bridged. You cannot disable bridging for the unroutable traffic.

•Protocol attributes should not be configured on the bridged interfaces when you are using IRB to bridge and route a given protocol. You can configure protocol attributes on the BVI, but you cannot configure bridging attributes on the BVI.

•A bridge links several network segments into one large, flat network. To bridge a packet coming from a routed interface among bridged interfaces, the bridge group should be represented by one interface.

•All ports in a BVI group must have matching maximum transmission unit (MTU) settings.

Configuring IRB

The process of configuring integrated routing and bridging consists of the following tasks:

1.Configure bridge groups and routed interfaces.

a.Enable bridging.

b.Assign interfaces to the bridge groups.

c.Configure the routing.

2.Enable IRB.

3.Configure the BVI.

a.Enable the BVI to accept routed packets.

b.Enable routing on the BVI.

4.Configure IP addresses on the routed interfaces.

5.Verify the IRB configuration.

When you configure the BVI and enable routing on it, packets that come in on a routed interface destined for a host on a segment that is in a bridge group are routed to the BVI and forwarded to the bridging engine. From the bridging engine, the packet exits through a bridged interface. Similarly, packets that come in on a bridged interface but are destined for a host on a routed interface go first to the BVI. The BVI forwards the packets to the routing engine that sends them out on the routed interface.

To configure a bridge group and an interface in the bridge group, perform the following procedure, beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

ML_Series(config)# bridge bridge-group

Defines one or more bridge groups.

 

protocol {ieee rstp}

 

Step 2

 

 

ML_Series(config)# interface type number

Enters interface configuration mode.

Step 3

 

 

ML_Series(config-if)# bridge-group

Assigns the interface to the specified bridge

 

bridge-group

group.

 

 

 

Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5

10-2

78-18133-01

 

 

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Cisco Systems 15310-MA, 15310-CL manual Configuring IRB, 10-2
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15310-CL, 15310-MA specifications

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