Cisco SD2008T-NA Configuration Manual page 61

Chapter 3 Configuring Ports and Interfaces
Overview of Ports and Interfaces
Figure 3-4 illustrates the relationship between ports, interfaces, and WLANs.
Figure 3-4 Ports, Interfaces, and WLANs
As shown in Figure 3-4, each controller port connection is an 802.1Q trunk and should be configured as
such on the neighbor switch. On Cisco switches, the native VLAN of an 802.1Q trunk is an untagged
VLAN. Therefore, if you configure an interface to use the native VLAN on a neighboring Cisco switch,
make sure you configure the interface on the controller to be untagged.
A zero value for the VLAN identifier (on the Controller > Interfaces page) means that the interface is
Note
untagged.
The default (untagged) native VLAN on Cisco switches is VLAN 1. When controller interfaces are
configured as tagged (meaning that the VLAN identifier is set to a non-zero value), the VLAN must be
allowed on the 802.1Q trunk configuration on the neighbor switch and not be the native untagged VLAN.
Cisco Wireless LAN Controller Configuration Guide
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