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VLAN Rewrite

You can rewrite VLAN tags on VPLS interfaces. Rewriting VLAN tags allows you to use an additional (outer) VLAN tag to differentiate between CE devices that share a VLAN ID.

You can configure rewrite operations to stack (push), remove (pop), or rewrite (swap) tags on single-tagged frames. If a port is not configured for VLAN tagging, rewrite operations are not supported on any logical interface on that port.

You can configure the following VLAN rewrite operations:

pop—Remove a VLAN tag from the top of the VLAN tag stack. The outer VLAN tag of the frame is removed.
push—Add a new VLAN tag to the top of the VLAN stack. An outer VLAN tag is pushed in front of the existing VLAN tag.
swap—Replace the VLAN tag at the top of the VLAN tag stack with a user-specified VLAN tag value.

You perform VLAN rewrite operations by applying input and output VLAN maps at the ingress and egress, respectively, of the interface. For incoming frames, use the input-vlan-map; for outgoing frames, use the output-vlan-map.

The VPLS implementation on Services Routers does not support dual-tagged frames. Therefore, VLAN rewrite operations are not supported on dual-tagged frames. VLAN rewrite operations such as pop-pop, pop-swap, push-push, swap-push, and swap-swap, which are supported on M-series and T-series routing platforms, are not supported on Services Routers.

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