Supported Platforms
Related Documentation
- QFabric System, QFX Series standalone switches
- Verifying That a Series of Tagged VLANs Has Been Created
- Example: Setting Up Basic Bridging and a VLAN on the QFX Series
- Example: Setting Up Bridging with Multiple VLANs
- Understanding Bridging
Creating a Series of Tagged VLANs
When you divide an Ethernet LAN into multiple VLANs, each VLAN is assigned a unique IEEE 802.1Q tag. This tag is associated with each frame in the VLAN, and the network nodes receiving the traffic can use the tag to identify which VLAN a frame is associated with.
Instead of configuring VLANs and 802.1Q tags one at a time for a trunk interface, you can configure a VLAN range to create a series of tagged VLANs.
When an Ethernet LAN is divided into VLANs, each VLAN is identified by a unique 802.1Q tag. The tag is applied to all frames so that the network nodes receiving the frames can detect which VLAN the frames belong to. Trunk ports, which multiplex traffic among a number of VLANs, use the tag to determine the origin of frames and where to forward them.
For example, you could configure the VLAN employee and specify a tag range of 10 through 12. This creates the following VLANs and tags:
- VLAN employee-10, tag 10
- VLAN employee-11, tag 11
- VLAN employee-12, tag 12
Creating tagged VLANs in a series has the following limitations:
- Layer 3 interfaces do not support this feature.
- Because an access interface can only support one VLAN member, access interfaces also do not support this feature.
 | Note: This task uses Junos OS for QFX3500 and QFX3600 switches that does not support the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does support ELS, see Creating a Series of Tagged VLANs.. |
To configure a series of tagged VLANs using the CLI (here, the VLAN is employee):
- Configure the series (here, a VLAN series from 120 through
130):
[edit]
user@switch# set vlans employee vlan-range 120-130 - Associate a series of tagged VLANs when you configure an interface in one of two ways:
- Include the name of the series:
[edit interfaces]
user@switch# set interfaces xe-0/0/22.0 family ethernet-switching vlanmembers employee - Include the VLAN range:
[edit interfaces]
user@switch# set interfaces xe-0/0/22.0 family ethernet-switching vlan members 120–130
Associating a series of tagged VLANS to an interface by name or by VLAN range has the same result: VLANs __employee_120__ through __employee_130__ are created.
| Note: When a series of VLANs is created using the vlan-range command, the VLAN names are preceded and followed by a double underscore. |
Related Documentation
- QFabric System, QFX Series standalone switches
- Verifying That a Series of Tagged VLANs Has Been Created
- Example: Setting Up Basic Bridging and a VLAN on the QFX Series
- Example: Setting Up Bridging with Multiple VLANs
- Understanding Bridging
Published: 2014-07-23
Supported Platforms
Related Documentation
- QFabric System, QFX Series standalone switches
- Verifying That a Series of Tagged VLANs Has Been Created
- Example: Setting Up Basic Bridging and a VLAN on the QFX Series
- Example: Setting Up Bridging with Multiple VLANs
- Understanding Bridging
