Background
This document talks about configuring an interface or port on a EX switch to be a member of a Vlan, then how to set up tagged/trunked port so that you can pass vlan information to another switches trunk port. This was tested on an EX4200 running Junos 9.4R1.8
Configuring a port for vlan membership
Define a vlan
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admin@switch# set vlans <name of vlan> vlan-id <vlan numerical id>
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admin@switch# set vlans vlan10 vlan-id 10
Configure a port for membership in that vlan
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admin@switch# set interface <interface name> unit <unit number> ethernet-switching vlan members <name of vlan>
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admin@switch# set interfaces ge-0/0/12 unit 0 family ethernet-switching vlan members vlan10
Set mode for access
Actually this is not necessary as access mode is the default
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admin@switch# set interface <interface name> unit <unit number> ethernet-switching port-mode access
Configuring a interface as a trunk port
Define a vlan
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admin@switch# set vlans <name of vlan> vlan-id <vlan numerical id>
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admin@switch# set vlans vlan10 vlan-id 10
Configure a port for membership in that vlan
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admin@switch# set interface <interface name> unit <unit number> ethernet-switching vlan members <name of vlan>
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admin@switch# set interfaces ge-0/0/12 unit 0 family ethernet-switching vlan members vlan10
Set mode for trunking
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admin@switch# set interface <interface name> unit <unit number> ethernet-switching port-mode trunk
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