vlan-tags (Stacked VLAN Tags)
Syntax
Hierarchy Level
Release Information
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 12.1X48 for PTX Series Packet Transport Routers.
Description
Bind TPIDs and 802.1Q VLAN tag IDs to a logical interface. TPID fields are used to identify the frame as an IEEE 802.1Q-tagged frame.
Options
inner tpid.vlan-id—A TPID and a valid VLAN identifier. TPID is a 16-bit field set to a value of 0x8100 in order to identify the frame as an IEEE 802.1Q-tagged frame.
Range: (most routers) For VLAN ID, 1 through 4094. VLAN ID 0 is reserved for tagging the priority of frames. For PTX Series, VLAN ID 0 is not supported.
inner-list value— List or a set of VLAN identifiers.
This is supported on MX Series routers with Trio-based FPCs.
inner-range tpid. vid1–vid2—Specify a TPID and a range of VLAN IDs where vid1 is the start of the range and vid2 is the end of the range.
On the network-to-network (NNI) or egress interfaces of provider edge (PE) routers, you cannot configure the inner-range tpid. vid1—vid2 option with the vlan-tags statement for ISP-facing interfaces.
Range: For VLAN ID, 1 through 4094. VLAN ID 0 is reserved for tagging the priority of frames.
outer tpid.vlan-id—A TPID and a valid VLAN identifier.
Range: (most routers) For VLAN ID, 1 through 511 for normal interfaces, and 512 through 4094 for VLAN CCC interfaces. VLAN ID 0 is reserved for tagging the priority of frames. For PTX Series, VLAN ID 0 is not supported.
Configuring inner-range with the entire vlan-id range consumes system resources and is not a best practice. The inner-range must be used only when a subset of VLAN IDs of inner tag (not the entire range) needs to be associated with a logical interface. If you specify the entire range (1 through 4094), it has the same result as not specifying a range; however, it consumes Packet Forwarding Engine resources such as VLAN lookup table entries, and so on.
The following examples illustrate this further:
Inefficient
[edit interfaces interface-name]
stacked-vlan-tagging; unit number { vlan-tags outer vid inner-range 1-4094; }Best Practice
[edit interfaces interface-name] vlan-tagging; unit number { vlan-id vid; }
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.