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Configuring VLAN Translation
Limitations
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Setting the VLAN Translation Constant
Use this command to define the VLAN translation constant. Make sure that the same VLAN translation
constant is configured for all SCE platforms in the system.
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Options
The following options are available:
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From the SCE(config if)# prompt, type vlan translation increment|decrement value value and press
Step 1
Enter.
Sets the VLAN translation constant.
Setting the VLAN Translation Constant: Example
The following example sets the translation constant to 10, decremented at the network side.
SCE(config if)#vlan translation decrement value 10
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
6-16
LIC Bypass not supported – Translation is done in the transmission. Therefore, in LIC bypass, where
there is no transmission, there is also no translation.
This means that in general, installations using the VLAN translation feature should rely on cutoff
on failure and at upgrade (use redundant SCE platform).
STP hazard – VLAN translation may interfere with Spanning Tree Protocol. This should be taken
in consideration when deploying the solution.
The maximum offset that can be configured is 2047. Note that there is no protection for wraparound.
Options, page 6-16
Setting the VLAN Translation Constant: Example, page 6-16
increment | decrement —Keywords indicating whether to increment or decrement the VLAN by
the specified value.
value — Integer value by which the VLAN is to incremented or decremented.
The configured translation is applied to the network port side. The reverse operation is performed
at the subscriber side.
For example, if "increment 5" is defined, at the network port the VLAN is incremented by 5, and at
the subscriber port the VLAN is decremented by 5.
In this case, the network side VLAN tags might be 105, 205, 305, and the subscriber side the VLAN
tags would then be 100, 200, 300.
Default = 0
Maximum = 2047 (Note that there is no protection for wraparound of the VLAN value.)
Chapter 6
Configuring the Line Interface
OL-7827-12
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