Chapter 30 VLAN Mapping
GS2220 Series User’s Guide
292
C HAPTER 30
VLAN Ma pping
This chapter shows you how to configure VLAN mapping on the Switch.
30.1 VLAN Ma pping O ve rvie w
With VLAN mapping enabled, the Switch can map the VLAN ID and priority level of packets received
from a private network to those used in the service provider’s network.
The Switch checks incoming traffic from the switch ports (non-management ports) against the VLAN
mapping table first, the MAC learning table and then the VLAN table before forwarding them through
the Gigabit uplink port. If the incoming packets are untagged or tagged but do not match an entry in
the VLAN mapping table, the Switch does not translate the existing VLAN ID and uses the MAC table
and/or VLAN table to decide how to forward the packets.
30.1.1 VLAN Ma pping Exa m ple
In the following example figure, packets that carry VLAN ID 12 and are received on port 3 match a pre-
configured VLAN mapping rule. The Switch translates the VLAN ID from 12 into 123 before forwarding the
packets.
Fig ure 223 VLAN Mapping Example
30.1.2 Wha t You C a n Do
• Use the VLAN Ma pping screen (
Section 30.2 on page 293) to enable VLAN mapping on the Switch and
ports.
• Use the VLAN Ma pping C o nfig ure screen (Section 30.2.1 on page 293) to enable and edit the VLAN
mapping rules.
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