Cisco Cisco 2000 Series Wireless LAN Controller Guia De Informação
Q. What are the AP models that can run Lightweight AP Protocol
(LWAPP)?
(LWAPP)?
A. These AP platforms can run LWAPP:
Cisco Aironet 1500 Series
♦
Cisco Aironet 1240 AG Series
♦
Cisco Aironet 1230 AG Series
♦
Cisco Aironet 1200 Series
♦
Cisco Aironet 1130 AG Series
♦
Cisco Aironet 1000 Series
♦
Note: The Cisco Aironet APs listed can be ordered with Cisco IOS Software to operate as an
autonomous AP or with LWAPP. The part number decides if the AP is an IOS−based AP or
an LWAPP−based AP. For example, AIR−AP1242AG−A−K9 is an IOS−based AP, whereas
AIR−LAP1242AG−P−K9 is an LWAPP−based AP. The 1000 Series APs and the 1500 Series
APs are an exception to this criteria. All the 1000 Series APs and the 1500 Series AP support
only LWAPP.
autonomous AP or with LWAPP. The part number decides if the AP is an IOS−based AP or
an LWAPP−based AP. For example, AIR−AP1242AG−A−K9 is an IOS−based AP, whereas
AIR−LAP1242AG−P−K9 is an LWAPP−based AP. The 1000 Series APs and the 1500 Series
APs are an exception to this criteria. All the 1000 Series APs and the 1500 Series AP support
only LWAPP.
Q. What is the difference between an AP and an Ethernet bridge?
A. An AP serves as the connection point between wireless and wired networks or as the
center point of a stand−alone wireless network. APs allow wireless clients access to wired
LANs. In large installations, wireless users within radio range of an AP can roam throughout
a facility while maintaining seamless, uninterrupted access to the network.
center point of a stand−alone wireless network. APs allow wireless clients access to wired
LANs. In large installations, wireless users within radio range of an AP can roam throughout
a facility while maintaining seamless, uninterrupted access to the network.
Ethernet bridges connect wired LANs. Ethernet bridges connect one segment on the LAN to
another segment in the same building or across town. APs do not connect wired segments.
another segment in the same building or across town. APs do not connect wired segments.
Note: You can modify bridges to serve as APs. See the question Can you use a wireless
bridge as an AP? in this document.
bridge as an AP? in this document.
Q. What can you do if you purchase a new PC Memory Card International
Association (PCMCIA) or PCI card and the card does not register to later
APs?
Association (PCMCIA) or PCI card and the card does not register to later
APs?
A. Because of changes in the radio frequency (RF) data transfer scheme, an upgrade of your
AP firmware can be necessary. Refer to End−of−Sale and End−of−Life Product to determine
if your device is supported. If necessary, refer to Downloads − Wireless (
AP firmware can be necessary. Refer to End−of−Sale and End−of−Life Product to determine
if your device is supported. If necessary, refer to Downloads − Wireless (
registered customers
only
) in order to determine if an upgrade exists for your product.
Q. How close does an AP need to be to another AP for use of the AP as a
repeater to occur?
repeater to occur?
A. Each AP creates a radio cell. When multiple APs are used to extend coverage, wire the
APs to the LAN with a slight overlap of each cell. Keep the cells far enough out of range that
the APs do not hear other APs and compete for the airwaves. Radio packet collisions and
decreases in throughput can occur if there is too much overlap.
APs to the LAN with a slight overlap of each cell. Keep the cells far enough out of range that
the APs do not hear other APs and compete for the airwaves. Radio packet collisions and
decreases in throughput can occur if there is too much overlap.
When one or more APs are configured as repeaters, instead of a slight overlap of cells, the
repeater needs to be approximately 50 percent of the cell distance. Since a repeater does not
have a connection to the wired backbone, the repeater must be within radio range of another
AP on the wired LAN. This requirement means that you must situate the APs much closer to
repeater needs to be approximately 50 percent of the cell distance. Since a repeater does not
have a connection to the wired backbone, the repeater must be within radio range of another
AP on the wired LAN. This requirement means that you must situate the APs much closer to