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Configuring Interfaces to Support Both Single and Stacked VLANs

You can configure VLANs to support simultaneous transmission of 802.1Q VLAN single-tag and stacked frames on logical interfaces on the same Ethernet port, and on pseudowire logical interfaces.

Junos VLAN IDs for single-tag VLANs are equivalent to the outer tags used for stacked (dual-tag) VLANs. When configuring mixed (flexible) VLANs, any overlap on single-tag VLAN IDs and stacked VLAN outer tag values is supported only for dynamic VLANs on MPC line cards. When configuring mixed (flexible) VLANS on DPCE line cards, overlapping single-tag VLAN IDs and stacked VLAN outer tag values is not supported. This means that a dynamically created single-tagged VLAN interface prevents any overlapping stacked VLAN interfaces from being created or a dynamically created stacked VLAN interface prevents any overlapping single-tagged VLAN interfaces from being created.

Note:

For information about the maximum number of dynamic profiles, VLAN ranges, and stacked VLAN ranges for dynamic mixed VLAN configurations, see Dynamic 802.1Q VLAN Overview.

To configure both VLAN and stacked VLAN ranges:

  1. Specify the interface over which you want to create dynamic VLANs.
  2. Indicate that this interface is for use with both VLAN and stacked VLAN ranges.
  3. Define interface automatic configuration values.
  4. Specify that you want to modify VLAN ranges.
  5. Specify the VLAN dynamic profile for which you want to configure VLAN ranges. To create the dynamic profile, see Configuring a Dynamic Profile Used to Create Single-Tag VLANs.
  6. Specify the VLAN ranges that you want the dynamic profile to use. The following example specifies a lower VLAN ID limit of 2000 and an upper VLAN ID limit of 3000.
    Note:

    You can configure multiple dynamic profile associations (up to 32) with different VLAN range groups on each physical interface.
  7. Specify that you want to modify stacked VLAN ranges.
  8. Specify the stacked VLAN dynamic profile for which you want to configure VLAN ranges. To create the stacked VLAN dynamic profile, see Configuring a Dynamic Profile Used to Create Stacked VLANs.
  9. Specify the outer and inner stacked VLAN ranges that you want the dynamic profile to use. The following example specifies an outer stacked VLAN ID range from 3001 through 4000 (to avoid overlapping VLAN IDs with single-tag VLANs) and an inner stacked VLAN ID range of any (enabling a range from 1 through 4094 for the inner stacked VLAN ID).
    Note:

    You can configure multiple dynamic profile associations (up to 32) with different VLAN range groups on each physical interface.

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