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Configuring Integrated Routing and Bridging for a Bridge Domain in a Layer 2 Virtual Switch
Integrated routing and bridging (IRB) provides simultaneous support for Layer 2 bridging and Layer 3 IP routing on the same interface. IRB enables you to route local packets to another routed interface or to another bridge domain that has a Layer 3 protocol configured. You configure a logical routing interface by including the irb statement at [edit interfaces] hierarchy level and include that interface in the bridge domain. For more information about how to configure a routing interface, see the Junos® OS Network Interfaces.
 | Note: You can include only one routing interface in a bridge domain. |
To configure a virtual switch with IRB support, include the following statements:
To enable a virtual switch, you must specify virtual-switch as the instance-type. The instance-type virtual-switch statement is not supported at the [edit logical-systems logical-system-name] hierarchy level.
For each bridge domain that you configure for the virtual switch, specify a bridge-domain-name. You must also specify the value bridge for the domain-type statement.
For the vlan-id statement, you can specify either a valid VLAN identifier or the none option.
| Note: For a single bridge domain, you can include either the vlan-id statement or the vlan-tags statement, but not both. |
To include one or more logical interfaces in the bridge domain, specify the interface-name for each Ethernet interface to include that you configured at the [edit interfaces irb] hierarchy level.
To associate a routing interface with a bridge domain, include the routing-interface routing-interface-name statement and specify a routing-interface-name you configured at the [edit interfaces irb] hierarchy level. You can configure only one routing interface for each bridge domain. For more information about how to configure logical and routing interfaces, see the Junos® OS Network Interfaces.
| Note: If you configure a routing interface to support IRB in a bridge domain, you cannot use the all option for the vlan-id statement. |
