User Manual

Data network planning Planning considerations
2-46
pmp-0047 (December 2012)
• if 10 are connected, and another attempts to connect
o and no Translation Table entry is older than 255 minutes, the attempt is ignored.
o and an entry is older than 255 minutes, the oldest entry is removed and the attempt is successful.
• the Send Untranslated ARP parameter in the General tab of the Configuration page can be
o disabled, so that the AP will overwrite the MAC address in Address Resolution Protocol (ARP) packets
before forwarding them.
o enabled, so that the AP will forward ARP packets regardless of whether it has overwritten the MAC
address.
This is the Translation Bridging feature, which you can enable in the General tab of the Configuration web page in
the AP. When this feature is disabled, the setting of the Send Untranslated ARP parameter has no effect, because
all packets are forwarded untranslated (with the source MAC address intact).
See Address Resolution Protocol on Page 2-44.
Engineering VLANs
The radios support VLAN functionality as defined in the 802.1Q (Virtual LANs) specification, except for the
following aspects of that specification:
• the following protocols:
o Generic Attribute Registration Protocol (GARP) GARV
o Spanning Tree Protocol (STP)
o Multiple Spanning Tree Protocol (MSTP)
o GARP Multicast Registration Protocol (GMRP)
• embedded source routing (ERIF) in the 802.1Q header
• multicast pruning
• flooding unknown unicast frames in the downlink
As an additional exception, the AP does not flood downward the unknown unicast frames to the SM.
A VLAN configuration in Layer 2 establishes a logical group within the network. Each computer in the VLAN,
regardless of initial or eventual physical location, has access to the same data. For the network operator, this
provides flexibility in network segmentation, simpler management, and enhanced security.