• Supported Platforms
• EX Series

• Related Topics
• Example: Configuring Layer 3 Subinterfaces for a Distribution Switch and an Access Switch
• Verifying That Layer 3 Subinterfaces Are Working
• Understanding Layer 3 Subinterfaces

Configuring a Layer 3 Subinterface (CLI Procedure)

EX Series switches use Layer 3 subinterfaces to divide a physical interface into multiple logical interfaces, each corresponding to a VLAN. The switch uses the Layer 3 subinterfaces to route traffic between subnets.

To configure Layer 3 subinterfaces, you enable VLAN tagging and partition one or more physical ports into multiple logical interfaces, each corresponding to a VLAN ID.

Before you begin, make sure you set up your VLANs. See Configuring VLANs for EX Series Switches (CLI Procedure) or Configuring VLANs for EX Series Switches (J-Web Procedure).

To configure Layer 3 subinterfaces:

1. Enable VLAN tagging:
   
   

   [edit interfaces interface-name]
user@switch# set vlan-tagging
2. Bind each VLAN ID to a logical interface:
   
   

   [edit interfaces interface-name]
user@switch# set unit logical-unit-number vlan-id vlan-id-number