Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1478

Complete Software Guide for Junos
Creating a Series of Tagged VLANs (CLI Procedure)
1382
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OS for EX Series Ethernet Switches, Release 10.3
To identify which VLAN traffic belongs to, all frames on an Ethernet VLAN are identified
by a tag, as defined in the IEEE 802.1Q standard. These frames are tagged and are
encapsulated with 802.1Q tags. For a simple network that has only a single VLAN, all
traffic has the same 802.1Q tag.
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 know
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
This creates the following VLANs and tags:
VLAN , tag
employee-10
VLAN employee-11 , tag 11
VLAN , tag
employee-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.
Voice over IP (VoIP) configurations do not support a range of tagged VLANs.
employee
10
12
and specify a tag range of
Copyright © 2010, Juniper Networks, Inc.
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10-12