H3C Technologies H3C MSR 50 - Manual (Page 40)

31
Feature MSR 900 MSR 930 MSR
20-1X
MSR 20 MSR 30 MSR 50 MSR
2600
802.11n No
Available
for MSR
930
(WLAN &
HSPA+),
MSR 930
(WLAN &
EVDO),
and MSR
930
(WLAN)
Available
for routers
with a
SIC_WLA
N module
that
supports
802.11n
Available
for routers
with a
SIC_WLA
N module
that
supports
802.11n
Available
for routers
with a
SIC_WLA
N module
that
supports
802.11n
Available
for routers
with a
SIC_WLA
N module
that
supports
802.11n
Available
for routers
with a
SIC_WLA
N module
that
supports
802.11n
Enabling 802.11n protection
When both 802.11n and non 802.11n clients access a WLAN network, interference easily occurs. The
access rate is degraded significantly because they adopt different modulation modes. To enable both
802.11n and non-802.11n clients to operate correctly, enable 802.11n protection for an 802.11n device to
send RTS/CTS or CTS-to-self (the destination of the CTS packets is the device that sends them) packets to
non-802.11n devices, which then defer access to the medium.
The following cases require 802.11n protection to be enabled an 802.11n AP.
• A non-802.11n client associates with the 802.11n AP. In this case, 802.11g protection is always
enabled without manual intervention.
• The 802.11n AP detects a non-802.11n BSS or some 802.11n packets that are not destined to it. To
enable 802.11n protection, issue the dot11g protection enable command.
To enable 802.11n protection:
Step Command Remarks
143. Enter system view. system-view N/A
144. Enter WLAN RRM view. wlan rrm N/A
145. Enable 802.11n protection. dot11n protection enable
Optional.
By default, 802.11n protection is
disabled.
Enabling 802.11n protection
reduces network performance.
Configuring 802.11n protection mode
802.11n protection modes include RTS/CTS and CTS-to-self.
• RTS/CTS—An AP sends an RTS packet before sending data to a client. After receiving the RTS
packet, all the devices within the coverage of the AP do not send data within the specified time.
Upon receiving the RTS packet, the client sends a CTS packet. This ensures that all the devices within
the coverage of the client do not send data within the specified time.
• CTS-to-Self—An AP uses its IP address to send a CTS packet before it sends data to a client. This
ensures that all the devices within the coverage of the AP do not send data within the specified time.