ZyXEL Communications XS3800-28, User Manual, Page: 444 / 789

Chapter 59 VLAN Mapping
XS3800-28 User’s Guide
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59
VLAN Mapping
This chapter shows you how to configure VLAN mapping on the Switch.
59.1 VLAN Mapping Overview
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. When VLAN mapping is enabled, the Switch discards the tagged packets that
do not match an entry in the VLAN mapping table. If the incoming packets are untagged, the Switch
adds a PVID based on the VLAN setting.
Note: You cannot enable VLAN mapping and VLAN stacking at the same time.
59.1.1 VLAN Mapping Example
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. Any packets carrying a VLAN tag other than 12 (such as 10) and received on port 3 will be
dropped.
Figure 340 VLAN Mapping Example
59.1.2 What You Can Do
• Use the VLAN Mapping screen ( Section 59.2 on page 445 ) to enable
VLAN mapping on the Switch and