Vlan Translation; Example Configuration - Allied Telesis SwitchBlade x3100 Series Manual

Introduction

4.10 VLAN Translation

4.10.1 Introduction
When customer networks are connected through network operator networks, customers may want to keep
their existing VLAN assignments. It is not uncommon for the VLAN IDs to be same for different customers
(overlap). To allow this overlap, a network operator needs to be able to change (translate) a customer VID into
a unique VLAN ID for transport across the network.
To do this, an 802.1q tagged VLAN can be configured with this translations option. The general flow of com-
mands to perform this translation are:
Create a VLAN (
•
CREATE VLAN=VLAN100 VID=100
Add an interface to the VLAN as a tagged port (
•
Turn the translation option on for the port for a customer VLAN ID (
•
FACE=1.0 TRANSLATE=10
This will result in the following:
When a tagged frame with a VLAN ID of 10 enters the interface 1.0, the VLAN ID will be translated to
•
VLAN ID 100.
When the tagged frame with VLAN ID 100 leaves the interface 1.0, the VLAN ID will be translated (back) to
•
VLAN ID 10.
This is shown in more detail in the configuration example in 4.10.5.

4.10.2 Example Configuration

Figure 4-27 shows a set of SBx3112s that are configured for two customers, A and B, where each in their net-
work has a VLAN 10 configured. Moreover, there is also a VLAN 10 configured against other interfaces.
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
ADD VLAN=VLAN100 INTERFACE=1.0 FRAME=TAGGED
)
)
SET VLAN=VLAN100 INTER-
Introduction
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