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ISCOM2600G-HI (A) Series Configuration Guide
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2.5 VLAN mapping
2.5.1 Introduction
VLAN mapping is used to replace the private VLAN Tag of Ethernet packets with carrier's
VLAN Tag, making packets transmitted according to carrier's VLAN forwarding rules. When
packets are sent to the peer private network from the ISP network, the VLAN Tag is restored
to the original private VLAN Tag according to the same VLAN forwarding rules. Therefore
packets are correctly sent to the destination.
Figure 2-9 shows principles of VLAN mapping.
Figure 2-9 Principles of VLAN mapping
After receiving a user private network packet with a VLAN Tag, the ISCOM2600G-HI series
switch matches the packet according to configured VLAN mapping rules. If successful, it
maps the packet according to configured VLAN mapping rules.
By supporting 1: 1 VLAN mapping, the ISCOM2600G-HI series switch replaces the VLAN
Tag carried by a packet from a specified VLAN to the new VLAN Tag.
Different from QinQ, VLAN mapping does not encapsulate packets with multiple layers of
VLAN Tags, but needs to modify VLAN Tag so that packets are transmitted according to the
carrier's VLAN forwarding rule.
2.5.2 Preparing for configurations
Scenario
Different from QinQ, VLAN mapping is used to change the VLAN Tag without encapsulating
multilayer VLAN Tag so that packets are transmitted according to the carrier's VLAN
mapping rules. VLAN mapping does not increase the frame length of the original packet. It
can be used in the following scenarios:
A user service needs to be mapped to a carrier's VLAN ID.
Multiple user services need to be mapped to a carrier's VLAN ID.
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