Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 442)

442 Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Chapter 15 Configuring VLANs
You extend VLANs into a wireless LAN by adding IEEE 802.11Q tag awareness
to the access point. Frames destined for different VLANs are transmitted by the
wireless access point/workgroup bridge on different SSIDs with different WEP
keys. Only the clients associated with that VLAN receive those packets.
Conversely, packets coming from a client associated with a certain VLAN are
802.11Q tagged before they are forwarded onto the wired network.
If 802.1q is configured on the FastEthernet interface of an access point, the access
point always sends keepalives on VLAN1 even if VLAN1 is not defined on the
access point. As a result, the Ethernet switch connects to the access point and
generates a warning message. There is no loss of function on both the access point
and the switch. However, the switch log contains meaningless messages that can
cause more important messages to be wrapped and not be seen.
This behavior creates a problem when all SSIDs on an access point are associated
to mobility networks. If all SSIDs are associated to mobility networks, the
Ethernet switch port the access point is connected to can be configured as an
access port. The access port is normally assigned to the native VLAN of the
access point, that is not necessarily VLAN1, that causes the Ethernet switch to
generate warning messages saying that traffic with an 802.1q tag is sent from the
access point.
You can eliminate the excessive messages on the switch by disabling the keepalive
function.