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Configuring a Set of Bridge Domains for a Layer 2 Trunk Port

You can configure a set of bridge domains that are associated with a Layer 2 trunk port. The set of bridge domains function as a switch. Packets received on a trunk interface are forwarded within a bridge domain that has the same VLAN identifier. A trunk interface also provides support for IRB, which provides support for Layer 2 bridging and Layer 3 IP routing on the same interface.

To configure a Layer 2 trunk port and set of bridge domains, include the following statements:



[edit interfaces]

interface-name {


unit number {


family bridge {
interface-mode access;

vlan-id number;
}


}


}

interface-name {
native-vlan-id number;


unit number {


family bridge {
interface-mode trunk;
vlan-id-list [ numbers ];
}


}


}
[edit bridge-domains]

bridge-domain-name {

vlan-id number;
 . . . .
}

You must configure a bridge domain and VLAN identifier for each VLAN associated with the trunk interface. You can configure one or more trunk or access interfaces at the [edit interfaces] hierarchy level. An access interface enables you to accept packets with no VLAN identifier. For more information about configuring trunk and access interfaces, see the JUNOS Network Interfaces Configuration Guide.

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