Binding a VLAN ID to a Logical Interface

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Ethernet interfaces can be partitioned; you can assign up to 4095 different logical interfaces, one for each VLAN.

VLAN ID 0 is reserved for tagging the priority of frames. To bind a VLAN ID to a logical interface, include the vlan-id or vlan-id-range statement:




vlan-id number;

You can include this statement at the following hierarchy levels:

[edit interfaces interface-name unit logical-unit-number]
[edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]

Note: For Gigabit Ethernet IQ and Gigabit Ethernet PICs with SFPs (except the built-in Gigabit Ethernet port on the M7i platform), VLAN IDs on a single interface can differ from each other.

Because Intermediate System-to-Intermediate System (IS-IS) has an 8-bit limit for broadcast multiaccess media, you cannot set up more than 255 adjacencies over Gigabit Ethernet using VLAN tagging. For more information, see the JUNOS Routing Protocols Configuration Guide.

VLAN IDs 1 through 511 are reserved for normal VLANs. VLAN IDs 512 and above are reserved for VLAN circuit cross-connect (CCCs).

For Gigabit Ethernet IQ interfaces and Gigabit Ethernet PICs with SFPs (except the 10-port Gigabit Ethernet PIC and the built-in Gigabit Ethernet port on the M7i platform), you can configure flexible Ethernet services encapsulation on the physical interface. With flexible Ethernet services encapsulation, VLAN IDs from 1 through 511 are no longer reserved for normal VLANs.

Table 47 lists VLAN ID range by interface type.

Table 47: VLAN ID Range by Interface Type

Interface Type	VLAN ID Range
Aggregated Ethernet for Fast Ethernet	1 through 1023
Aggregate Ethernet for Gigabit Ethernet	1 through 4094
4-port, 8-port, and 12-port Fast Ethernet	1 through 1023
48-port Fast Ethernet	1 through 4094
Tri-Rate Ethernet copper	1 through 4094
Gigabit Ethernet	1 through 4094
Gigabit Ethernet IQ	1 through 4094
10-Gigabit Ethernet	1 through 4094
Management and internal Ethernet interfaces	1 through 1023

Binding a VLAN ID Range to a Logical Interface

The vlan-id-range statement allows a range of VLAN IDs to be bound to a single logical port. A VLAN range can be used by service providers to interconnect multiple VLANs belonging to a particular customer over multiple sites. Using a VLAN ID range conserves switch resources and simplifies configuration.

To configure mixed tagging, include the vlan-id-range statement at the [edit interfaces ge-fpc/pic/port] hierarchy level:



[edit interfaces ge-fpc/pic/port]

unit logical-unit-number{
encapsulation vlan-bridge;

vlan-id-range number-number;
}

Example: Binding a VLAN ID Range to a Logical Interface

The following example configures two different ranges of VLAN IDs on two different logical ports:



[edit interfaces]
ge-3/0/0 {
flexible-vlan-tagging;


unit 0 {
encapsulation vlan-bridge;
vlan-id-range 500-600;
}


}
ge-3/0/1 {


flexible-vlan-tagging;
unit 0 {
encapsulation vlan-bridge;
vlan-id-range 200-300;
}


}

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