On Gigabit Ethernet, Gigabit Ethernet IQ, Gigabit Ethernet IQ2, 10-Gigabit Ethernet IQ2 interfaces, and MX-series router Gigabit Ethernet, Tri-Rate Ethernet copper, and 10-Gigabit Ethernet interfaces with the VLAN encapsulation type configured to support Layer 2 tunneling protocols such as CCC or VPLS (as described in Configuring 802.1Q VLANs), you can stack and rewrite VLAN tags. Stacking and rewriting VLAN tags allows you to use an additional (outer) VLAN tag to differentiate between customer edge (CE) routing platforms that share one VLAN ID. A frame can be received on an interface, or it can be internal to the system (as a result of the input-vlan-map statement).
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Note: On IQ2 interfaces and MX-series interfaces, when a VLAN tag is pushed, the inner VLAN IEEE 802.1p bits are copied to the IEEE bits of the VLAN or VLANs being pushed. If the original packet is untagged, the IEEE bits of the VLAN or VLANs being pushed are set to 0. |
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