Wireless Service Status - Avaya AP-7 User Manual

Performing Advanced Configuration
RTS/CTS Medium Reservation
The 802.11 standard supports optional RTS/CTS communication based on packet size. Without
RTS/CTS, a sending radio listens to see if another radio is already using the medium before
transmitting a data packet. If the medium is free, the sending radio transmits its packet.
However, there is no guarantee that another radio is not transmitting a packet at the same time,
causing a collision. This typically occurs when there are hidden nodes (clients that can
communicate with the Access Point but are out of range of each other) in very large cells.
When RTS/CTS occurs, the sending radio first transmits a Request to Send (RTS) packet to
confirm that the medium is clear. When the receiving radio successfully receives the RTS
packet, it transmits back a Clear to Send (CTS) packet to the sending radio. When the sending
radio receives the CTS packet, it sends the data packet to the receiving radio. The RTS and
CTS packets contain a reservation time to notify other radios (including hidden nodes) that the
medium is in use for a specified period. This helps to minimize collisions. While RTS/CTS adds
overhead to the radio network, it is particularly useful for large packets that take longer to
resend after a collision occurs.
RTS/CTS Medium Reservation is an advanced parameter and supports a range between 0 and
2347 bytes. When set to 2347 (the default setting), the RTS/CTS mechanism is disabled. When
set to 0, the RTS/CTS mechanism is used for all packets. When set to a value between 0 and
2347, the Access Point uses the RTS/CTS mechanism for packets that are the specified size or
greater. You should not need to enable this parameter for most networks unless you suspect
that the wireless cell contains hidden nodes.

Wireless Service Status

You can shutdown (or resume) the wireless service on the wireless interface of the AP by using
the CLI, HTTP, or SNMP interface. When the wireless service on a wireless interface is
shutdown, the AP will:
Stop the AP services to wireless clients connected on that wireless interface by
•
disassociating them
Disable the associated BSS and WDS ports on that interface
•
Disable the transmission and reception of frames on that interface
•
Indicate the wireless service shutdown status of the wireless interface through LED and
•
traps
Enable Ethernet interface so that it can receive a wireless service resume command from
•
the CLI, HTTP, or SNMP interface.
Note:
The wireless service cannot be shutdown on an interface where Rogue Scan is
Note:
enabled.
In shutdown state, the AP will not transmit and receive frames from the wireless interface and
will stop transmitting periodic beacons. Moreover, none of the frames received from the
Ethernet interface will be forwarded to that wireless interface.
72 Avaya Wireless AP-7 User Guide