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Chapter 6
Configuring the Line Interface
Figure 6-2
Legend
In this example, traffic enters the router via the access ports; it is forwarded to an EtherChannel, which
is configured as a trunk, and enters the SCE 2000 platforms.
As can be seen from this drawing, the subscriber side VLAN tags must be different from those on the
network side, or the router will simply forward the traffic to the opposite port. This can be supported
very simply by having the SCE platform replace the VLAN tags according to a preset configuration.
VLAN Translation Features and Limitations
Features
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OL-7827-12
VLAN Translation
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EC1
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Access port
Trunk port
Configuration of an increment or decrement constant.
Configuration of the constant is global for the line card.
The configured operation (either increment or decrement) is applied to the network side.
The subscriber side automatically performs the opposite operation. That is, if the VLAN is
incremented by X on the network side, it is decremented by X on the subscriber side.
VLAN tagged packets are changed (incremented or decremented) before transmission.
Non-tagged packet are not changed.
This feature allows seamless processing with non-VLAN traffic.
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EC2
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SCE-A
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SCE-B
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VLAN trans
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
Configuring VLAN Translation
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Net
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6-15
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