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Virtual Switch Routing Instance

On MX-series routers only, use the virtual-switch routing instance type to isolate a LAN segment with its STP instance and to separate its VLAN ID space. A bridge domain consists of a set of ports that share the same flooding or broadcast characteristics. Each virtual switch represents a Layer 2 network. You can optionally configure a virtual switch to support Integrated Routing and Bridging (IRB), which facilitates simultaneous Layer 2 bridging and Layer 3 IP routing on the same interface. You can also configure Layer 2 control protocols to provide loop resolution. Protocols supported include the Spanning Tree Protocol (STP), RSTP, and MSTP.

To create a routing instance for a virtual switch, include at least the following statements in the configuration:



[edit]
routing-instances {



routing-instance-name

instance-type virtual-switch;



bridge-domains {



bridge-domain-name {

domain-type bridge;

vlan-id (all | none | number);

vlan-tags outer number inner number;

interface interface-name;
}


}




protocols {
mstp ...
}


}


}

The instance-type virtual-switch statement is not supported at the [edit logical-systems logical-system-name] hierarchy level.

For more information about configuring virtual switches, see Configuring Layer 2 Virtual Switches.

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