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Implicit VLAN Translation to a Normalized VLAN

The VLAN tags of a received packet are compared with the normalized VLAN tags specified with either the vlan-id or vlan-tags statements. If the VLAN tags of the received packet are different from the normalized VLAN tags, then appropriate VLAN tag operations (such as push-push, pop-pop, pop-swap, swap-swap, swap, and others) are implicitly made to convert the received VLAN tags to the normalized VLAN tags. For more information about these operations, see the JUNOS Routing Protocols Configuration Guide.

Then, the source MAC address of a received packet is learned based on the normalized VLAN configuration.

For output packets, if the VLAN tags associated with an egress logical interface do not match the normalized VLAN tags within the packet, then appropriate VLAN tag operations (such as push-push, pop-pop, pop-swap, swap-swap, swap, and others) are implicitly made to convert the normalized VLAN tags to the VLAN tags for the egress logical interface. For more information about these operations, see the JUNOS Routing Protocols Configuration Guide.

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