Nortel 2350 用户指南
Configuring APs 253
Nortel WLAN—Security Switch 2300 Series Configuration Guide
Changing the maximum receive threshold
The maximum receive threshold specifies the number of milliseconds a frame received by a radio can remain
in buffer memory. To change the maximum receive lifetime, use the following command:
in buffer memory. To change the maximum receive lifetime, use the following command:
set radio-profile name max-rx-lifetime time
The time can be from 500 ms (0.5 second) through 250,000 ms (250 seconds). The default is 2000 ms
(2 seconds).
(2 seconds).
To change the maximum receive threshold for radio profile rp1 to 4000 ms, type the following command:
WSS# set radio-profile rp1 max-rx-lifetime 4000
success: change accepted.
success: change accepted.
Changing the maximum transmit threshold
The maximum transmission threshold specifies the number of milliseconds a frame scheduled to be trans-
mitted by a radio can remain in buffer memory. To change the maximum transmit lifetime, use the following
command:
mitted by a radio can remain in buffer memory. To change the maximum transmit lifetime, use the following
command:
set radio-profile name max-tx-lifetime time
The time can be from 500 ms (0.5 second) through 250,000 ms (250 seconds). The default is 2000 ms
(2 seconds).
(2 seconds).
To change the maximum transmit threshold for radio profile rp1 to 4000 ms, type the following command:
WSS# set radio-profile rp1 max-tx-lifetime 4000
success: change accepted.
success: change accepted.
Changing the preamble length
By default, 802.11b/g radios advertise support for frames with short preambles and can support frames with
short or long preambles.
short or long preambles.
An 802.11b/g radio generates unicast frames to send to a client with the preamble length specified by the
client. An 802.11b/g radio always uses a long preamble in beacons, probe responses, and other broadcast or
multicast traffic.
client. An 802.11b/g radio always uses a long preamble in beacons, probe responses, and other broadcast or
multicast traffic.
Generally, clients assume access points require long preambles and request to use short preambles only if the
access point with which they are associated advertises support for short preambles. You can disable the adver-
tisement of support for short preambles by setting the preamble length value to long. In this case, clients
assume that the access point supports long preambles only and the clients request long preambles.
access point with which they are associated advertises support for short preambles. You can disable the adver-
tisement of support for short preambles by setting the preamble length value to long. In this case, clients
assume that the access point supports long preambles only and the clients request long preambles.
Changing the preamble length value affects only the support advertised by the radio. Regardless of the
preamble length setting (short or long), an 802.11b/g radio accepts and can generate 802.11b/g frames with
either short or long preambles.
preamble length setting (short or long), an 802.11b/g radio accepts and can generate 802.11b/g frames with
either short or long preambles.
If any client associated with an 802.11b/g radio uses long preambles for unicast traffic, the AP still accepts
frames with short preambles but does not transmit any frames with short preambles. This change also occurs if
the access point overhears a beacon from an 802.11b/g radio on another access point that indicates the radio
has clients that require long preambles.
frames with short preambles but does not transmit any frames with short preambles. This change also occurs if
the access point overhears a beacon from an 802.11b/g radio on another access point that indicates the radio
has clients that require long preambles.
The default preamble length value is short. This command does not apply to 802.11a radios.