H3C Technologies H3C MSR 50 - Manual (Page 21)

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To do… Use the command… Remarks
Specify the request to send
(RTS) threshold length
rts-threshold size
Optional
By default, the RTS threshold
is 2346 bytes.
Set the maximum number of
retransmission attempts for
frames larger than the RTS
threshold
long-retry threshold count
Optional
By default, the long retry
threshold is 4.
Specify the maximum number
of attempts to transmit a frame
shorter than the RTS
threshold
short-retry threshold count
Optional
By default, the short retry
threshold is 7.
Specify the interval for the AP
to hold received packets
max-rx-duration interval
Optional
By default, the interval is 2000
milliseconds.
Specify the maximum number
of associated clients
client max-count max-number
Optional
The default depends on the
device model.
This command is only
supported on ACs.
Configuring 802.11n
As the next generation wireless LAN technology, 802.11n supports both 2.4GHz and 5GHz bands. It
provides higher-speed services to customers by using the following two methods:
1) Increasing bandwidth: 802.11n can bond two adjacent 20-MHz channels together to form a
40-MHz channel. During data forwarding, the two 20-MHz channels can work separately with one
acting as the primary channel and the other acting as the secondary channel or work together as a
40-MHz channel. This provides a simple way of doubling the data rate.
2) Improving channel utilization through the following ways:
z 802.11n introduces the A-MPDU frame format. By using only one PHY header, each A-MPDU can
accommodate multiple Message Protocol Data Units (MPDUs) which have their PHY headers
removed. This reduces the overhead in transmission and the number of ACK frames to be used,
and thus improves network throughput.
z Similar with MPDU aggregation, multiple MAC Service Data Units (MSDU) can be aggregated into
a single A-MSDU. This reduces the MAC header overhead and thus improves MAC layer
forwarding efficiency.
z To improve physical layer performance, 802.11n introduces the short GI function, which shortens
the GI interval of 800 us in 802.11a/g to 400 us. This can increase the data rate by 10 percent.
Follow these steps to configure 802.11n:
To do… Use the command… Remarks
Enter system view system-view —
Enter AP template view
wlan ap ap-name model
model-name
—
Enter radio view
radio radio-number type
{ dot11an | dot11gn }
—